We offer a range of low-cost, high quality instrument needle valve

FD-LOK valves engineers and manufactures a range of instrument needle valve and Manifolds for use in the Oil, Gas and Petrochemical industries.
We are able to provide our needle valve manifolds with plugs. Each of our manifold valves have stainless steel colour coded identity tags affixed to individual valve head units. Our needle valves and manifolds may be degreased for oxygen service to Air Products AO3 standard. Our Firesafe needle valves and manifolds are constructed in austenitic stainless steel.
Count on us for Needle valves for safe, secure and leak-free connections, even in the harshest settings. We offer a range of low-cost, high quality instrument needle valve.  All direct mount instrument valve manifolds are supplied with Teflon gaskets and high tensile carbon steel bolts. Graphite gaskets and stainless steel bolts are available on request.

Fd-lok stainless steel needle valves have been at the forefront of needle valve technology

Fd-lok stainless steel needle valves have been at the forefront of needle valve technology. Since our formation in the befor 90's, we have pioneered the Needle Valve concept. Our range of needle valves and instrument valve manifolds offer true reliability and safety under high pressure. Our needle valves are the most unique valves on the market today, offering a diverse range of features and added extras to ensure that our customers are able to benefit from maximum efficiency through the Oil and Gas extraction process.
All our products are compatible with ISO 9001,our In-House testing facility assures, verify and confirm high quality of products that are available to our customers at the most competitive prices and in the timeliest manner possible.

Fd-lok provide them with products that suit their particular specifications

Welcome to Fd-lok - your destination ultimate for all your instrument needle valve and fittings needs. We are leading instrument valves manufacturers providing our customers with products that are of international standard at the most cost-effective prices in the market.  We are your best choice as industrial valves manufacturers as we give you products that are cost effective, highly durable, easily installable, low maintenance as well corrosion resistance. We cater to an extensive range of industries working in different segments and provide them with products that suit their particular specifications. These industries include:
• Sugar
• Textile
• Oil and gas
• Power
• Water and waste water treatment
• Chemical process industries
• Food
• Pharmaceuticals

Fd-lok is the preferred choice of its customers for offering an extensive assemblage of stainless steel needle valves.

Our company is the preferred choice of its customers for offering an extensive assemblage of stainless steel needle valves. Optimum quality raw materials procured from our reliable vendors are used for manufacturing these robust and high durability valves. These high pressure needle valves are suitable for reducing the torque requirements.
The series of needle valves are specially designed and manufactured for use in corrosive and hazardous environments. These valves are for use in process control, instrumentation and flow control applications. Non rotating Vee tip design, which forms a bearing joint with the stem eliminating any rotation between the plug and seat on closure ensuring long life.

Instrument type needle valve series

Fd-lok instrument needle valve controls the opening of a small orifice in a channel with a bar-shaped needle, controlling the flow by changing the channel resistance. The valve thus acts as a resistance. The flow changes when the pressure applied to the valve changes. A to make the pressure applied to the valve constant, thereby obtaining constant flow. This is an inexpensive method which is commonly used when the pressure loss on the valve outlet side does not change. Use a simplified type, precision type, or high pressure needle valves according to the usage.
This valve series is typically used with differential pressure and multivariable transmitters. Additionally, a Block and instrument valve manifolds design is used with inline gage and absolute pressure transmitters. A single block valve provides instrument isolation and a plug valve provides drain/vent capabilities.

Featuring the World’s most comprehensive range of instrumentation needle valves

Featuring the world’s most comprehensive range of instrumentation needle valves. The Fd-lok stainless steel needle valves range is designed and manufactured to the highest standards to meet the requirements of the severe applications anticipated for these valves. They have a split stem design, which ensures accurate seating, and a bubble tight seal. They are general-purpose valves for use on liquid or gas applications where the isolation of flow, equalisation and venting of pressure are the main criteria.
Our instrument check valves and needle valves are available in various materials. Sizes of our valves range from 1/8" up to 1" and beyond for custom applications. Fd-lok check valves and needle valves are ideal for water, oil, gas, chemical and air. If there is a valve you have question on, or if you do not see a valve that meets your specifications, please contact our sales staff for immediate assistance.

Needle valve has performance and reliability

Instrument needle valve provides easy flow regulation in all applications, including shut off and throttling for pressure gages and instruments.  With a one piece, hot forged brass body construction, years of maintenance-free service can be expected.  The needle valve, with its tamper-proof design and blowout-proof stem, provides excellent performance and reliability. FD-LOK instrument valves are designed for positive leak tight shut-off and regulation of fluids in process, power, and instrumentation applications. The series needle valves provide the user with the utmost in flexibility when designing miniaturized tubing or piping systems.

Acclaimed type needle valve

We are highly acclaimed in global market place for manufacturing and exporting an extensive range of high pressure needle valves. FD-LOK valves cater to wide requirements of industries such as aerospace, climate control equipment, filtration, hydraulics, process control and pneumatic. Manufactured in strict accordance with industry standards using high quality stainless steel, these stainless steel needle valves are available in different standard sizes. We offer these stainless steel needle valves to clients at competitive prices.
Features:
Rust proof finish
Easy to install
Can sustain high temperatures and pressures
Stainless Steel Needle Valves Series
With years of experience and industrial domain aptitude, we are occupied with offering a broad scope of Stainless Steel Needle Valves Series. These valves find application zone where the stream of high weight, grating loaded mediums should be controlled.
Forged or bar stock body construction.

The safety of the needle valve

Fd-lok make stainless steel needle valves come in bar stock as well as in forged construction various sizes, sealing styles, end connections and stem types.  High pressure needle valve is that its stems are interchangeable with any of its valves of the similar configurations thus resulting in low cost and less inventory.  We offer a range of needle valve that are fabricated from qualitative raw material and are as per the international standards.

Installation and long term maintenance issues

All of our instrument needle valve is ISO 9001 certified products.   Maximum pressure after many tests before shipment  to ensure leak free performance upon installation.  Our advanced design helps ensure years of leak free service, and our manufacturing processes ensure that our products are produced to the same high quality standards time after time.  Monoflange needle valve and manifolds are fully marked (permanently) to aid in installation and long term maintenance issues and our bonnets are color coded to aid in operation and maintenance of the valves and manifolds.  Innovative design, unbeatable quality proven by unequalled testing and competitive pricing make PRECISION 'The New Standard' in instrument manifolds and valves.

Fd-lok needle valve is suitable for all instrument isolation applications

Fd-lok needle valve is suitable for all instrument isolation applications, giving repeatable bubble tight shut off. Its operation is simple, economical and effective.
Inconel needle valve in a line or instrument very cost savings.  Top Sealing Bonnet style,Robust HIGH pressure design.  It has strong high pressure design, low torque operation, wide end connection with compact size. Fd-lok needle valve is maintenance free and all the material tracking,even at high temperatures is also very pressure.

Features and Specifications

Stainless steel needle valves features and specifications
Pressure rating to 10000psig(690bar).
Temperature rating from -65°F to 1200°F (-54°C to 649°C) with standard PTFE packing.
Compact and rugged body design.
Size from 1/8" to 1" and 3mm to 25mm.
Body Material is standard in 316 stainless steel.
Monoflange needle valve  is available in a wide range of configurations up to 1”. For extremely accurate flow metering, the Series offers the most precise control of fluids and gases.

Fd-lok instrument needle valve offers a wide range of sizes

Rugged and compactly designed, Fd-lok instrument needle valve  offers a wide range of sizes,  that work well for a variety of applications, including hydraulic and pneumatic systems.  Hy-Lok needle valves are meticulously designed for the flow, temperature and system required. High pressure needle valves is used in high pressure fluid handling components for the chemical/petrochemical, research, oil and gas.

Stainless steel needle valve maintenance

Stainless steel needle valves within a block and bleed function help achieve positive isolation within maintenance operations of a live process plant.  These work well in non-critical processes like with non-hazardous fluids or a low pressure system. Not only for maintenance. Fd-lok high pressure needle valves  also work well in flow-metering operations, and are especially good at maintaining a calibrated and constant low flow rate.

Meet your varying needs

Fd-lok Instrument needle valve has a one-piece forged body and PTFE packing.All designed to handle the extreme conditions of high pressure and high temperature services such as those in super-heated steam power plant services. With a multitude of configurations available, you will find a model to meet your varying needs. To withstand the extreme temperatures this valve is designed for,high pressure needle valve can be specified in either materials.

Available in a wide variety of connections

Needle Valves are designed to regulate flow to an instrument or other industrial application. Gauges needle valves are rugged enough for the oil & gas market, and suitable for most industrial applications.  Available in a wide variety of connections in 316 stainless steel and carbon steel bodies.
The instrument valves can be used for shutting off impulse lines or for isolation of pressure instruments. All valves are standard stainless steel and optional available in exotic materials, such as Hastelloy and Monel. This valve has a non-rotatable conical tip to ensure perfect alignment.

The virtue of the needle valve

The virtue of the needle valve is from the vernier effect of the ratio between the needle's length and its diameter, or the difference in diameter between needle and seat. A long travel axially (the control input) makes for a very small and precise change radially (affecting the resultant flow).
Needle valves may also be used in vacuum systems, when a precise control of gas flow is required, at low pressure,[1] such as when filling gas-filled vacuum tubes, gas lasers and similar devices.
Please make a selection from our High pressure needle valve in various materials or our range of rugged instrument manifold valves. They are suitable for isolation, bleeding, calibration, and testing of pressure instruments.

A needle valve has a relatively small orifice

An instrument needle valve uses a tapered pin to gradually open a space for fine control of flow. The flow can be controlled and regulated with the use of a spindle. A needle valve has a relatively small orifice with a long, tapered seat, and a needle-shaped plunger on the end of a screw, which exactly fits the seat.
As the screw is turned and the plunger retracted, flow between the seat and the plunger is possible; however, until the plunger is completely retracted, the fluid flow is significantly impeded. Since it takes many turns of the fine-threaded screw to retract the plunger, precise regulation of the flow rate is possible.

manifold valves and needle valves

General manifold valves and needle valves are engineered considering the specific process requirements and available in wide range of materials. General offers 2-Valve Manifolds, 3-Valve Manifolds, 5-Valve manifolds and Needle valves based on international standards. General is committed to ensure the highest quality of products and each manufactured product undergoes strict quality control and check at full fledged quality control laboratory.
Needle Valve provides easy flow regulation in all applications, including shut off and throttling for pressure gages and instruments.  With a one piece, hot forged brass body construction, years of maintenance-free service can be expected.  With its tamper-proof design and blowout-proof stem, provides excellent performance and reliability.

Instrument needle valve are manufactured

Instrument needle valve are manufactured in 316 stainless steel or in any machinable metals. stainless steel needle valves can be manufactured in accordance with specification .
Ensuring quality is one of the more important considerations in the production process at BULK.
It is not only inspected the final product but all the stage manufacturing steps are surveyed in detail.
Production of all components is carefully controlled from design through final testing.
Records are maintained to verify specification compliance in raw material procurement and testing.

Instrument needle valve Features & Benefits

Instrument needle valve Features & Benefits:
1, Top entry design, allows parts removal without removing valve from line.
2, One-piece forged body, no gasket leaks.
3, Integral needle-point stainless steel disc for accurate control.
4, Integral hardened seats.
5, Heavy duty, forged one-piece yoke for maximum rigidity.
6, One-piece forged gland flange allows for packing replacement without disassembling valve.
7, stainless steel needle valves corrosion resistant trim.
8, Available in socket weld and threaded ends for high pressures.

The needle valve block models

A valve with a needlelike part, a fine adjustment, or a small opening, especially a valve in which the opening is controlled by a needlelike or conical point that fits into a conical seat.  The needle valve block models a variable orifice created by a conical needle and a round sharp-edged orifice in thin material.
Needle valves within a block and bleed function help achieve positive isolation within maintenance operations of a live process plant. These work well in non-critical processes like with non-hazardous fluids or a low pressure system. The small port and needle-shaped, threaded plunger allows for precise flow regulation in low flow applications. Not only for maintenance, needle valves also work well in flow-metering operations, and are especially good at maintaining a calibrated and constant low flow rate.

Needle valves are usually used in flow-metering applications

Needle valves are usually used in flow-metering applications, especially when a constant, calibrated, low flow rate must be maintained for some time, such as the idle fuel flow in a carburetor.
Small, simple needle valves are often used as bleed valves in water-heating applications. Unlike a ball valve or valves with a rising stem, it is not easy to tell from examining the handle position whether the valve is open or closed.
Needle valves may also be used in vacuum systems, when a precise control of gas flow is required, at low pressure, such as when filling gas-filled vacuum tubes, gas lasers and similar devices.

the safety and reliability of a standard trunnion ball valve

An instrument needle valve uses a tapered pin to gradually open a space for fine control of flow. The flow can be controlled and regulated with the use of a spindle. A needle valve has a relatively small orifice with a long, tapered seat, and a needle-shaped plunger on the end of a screw, which exactly fits the seat.

As the screw is turned and the plunger retracted, flow between the seat and the plunger is possible; however, until the plunger is completely retracted, the fluid flow is significantly impeded. Since it takes many turns of the fine-threaded screw to retract the plunger, precise regulation of the flow rate is possible.

The stainless steel ball valve and needle valves

The stainless steel ball valve and needle valves, for fractional tubes, are used with most of clean air engineering's instrumentation. The ball and needle valve are designed for high pressure applications in a corrosive environment. For custom sizes, please contact a sales representative today. We stock a variety of sizes of Ball and Needle Valve and usually ships same day.
Needle Valves with Stainless Steel shells and bushings are constructed of PTFE and external non-fluid contacting parts of anodized Aluminum for corrosive gas, liquid, and high purity regulation. Can also be used as bubble tight shut off valves.

FD-LOK have the most comprehensive range of instrumentation needle valves

FD-LOK  featuring the World’s most comprehensive range of instrumentation needle valves. The stainless steel needle valves range is designed and manufactured to the highest standards to meet the requirements of the severe applications anticipated for these valves. They have a split stem design, which ensures accurate seating, and a bubble tight seal. They are general-purpose valves for use on liquid or gas applications where the isolation of flow, equalisation and venting of pressure are the main criteria. The stainless steel needle valves is available ex stock with a variety of end connections from 1/4″ to 3/4″, giving any combination of ends from NPT, BSPP, BSPT, Single and Twin ferrule OD compression. They are available for application up to 10,000 psi and temperatures up to 400 degrees centigrade.

Needle valve to use

Needle valve easy maintenance, simple ball valve, seals are generally activities,Instrument manifolds removal of the replacement is more convenient. When fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. Wide range of applications, from small diameter to a few millimeters to a few meters from high vacuum to high pressure can be applied. Because there are wiping Needle valve opening and closing process, so the media can be used with suspended solid particles.Instrument needle valve Grease should Needle valve metal materials, rubber parts, plastic parts and the working media are compatible. Working medium for the gas, can be used for example, JP 221 grease. Coated on the surface of the seal mounting groove of a thin layer of grease, coated with a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coated with a thin layer of grease.

Needle valve structure analysis

Needle valve is solid move after pressure does not occur. With a floating ball valve are firmly seat after by media pressure, move the seat occurs, the seal is pressed onto the ball, Needle valve in order to protect the seal. Weekdays with the ball, the lower shaft with bearings, manipulating small torque, useful in high-pressure valve with large diameter. Needle valve characteristic is horizontal, and the flow is upward mobility, so the valve is closed the water pressure on the valve play a significant role in the film is, the higher the pressure the better sealing performance. Needle valve when the valve is working as a plane rotation, need to overcome the friction coefficient between the valves,Instrument needle valve and the impact it's not as big hydraulic valve. But to overcome the friction in the water under the lamination pressure. Was friction between the laminations through practical experiment, several Corfu little force increases.

Instrument needle valve in terms of energy savings

Design and manufacture of valves, to minimize the valve on the flow resistance of the medium. Opening and closing force and closing torque is the valve open or closed by force or torque to be applied. Close the valve, the need to open and close between the two pieces with the fat seat sealing surface seal formed between certain specific pressure, but also to overcome between the stem and the packing nut thread between the stem and the stem end bearing at and other friction parts of the friction, Instrument needle valve and therefore must apply the closing force and closing moments, the valve in the opening and closing process, the need to stop the force and the opening and closing moments of change, and its maximum is close to the final instant or open the initial transient. Instrument needle valve design and manufacture of valves should strive to reduce the closing force and closing moments. Hoisting speed is used to open or close the valve to complete a time of action required to represent. Valves open and close speed generally no strict requirements, but some conditions have special requirements for opening and closing speed,5 way manifolds if the prompt to open or close, to prevent accidents, and some require slow shut down to prevent water hammer, etc., this should be considered in the selection of valve type. This refers to the valve for the medium parameters change, and make the appropriate degree of sensitivity. For the throttle valve, regulating valve is used to adjust the valves and valve medium parameters, such as valves trap with a specific function, its functional sensitivity and reliability are very important technical performance indicators. Life represents the durability of the valve, the valve is an important performance indicators, and has great economic significance. Usually able to guarantee the number of seals required to open and close said, can also be used to indicate the use of time. Instrument measuring instrument needle valve is an important part of the piping system, the main shut-off valve and ball valve, its function is turned on or off for pipeline access use.

Needle valve to use

Needle valve easy maintenance, simple ball valve, seals are generally activities, Instrument manifolds removal of the replacement is more convenient. When fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. Wide range of applications, from small diameter to a few millimeters to a few meters from high vacuum to high pressure can be applied. Because there are wiping Needle valve opening and closing process, so the media can be used with suspended solid particles. Instrument needle valve Grease should Needle valve metal materials, rubber parts, plastic parts and the working media are compatible. Working medium for the gas, can be used for example, JP 221 grease. Coated on the surface of the seal mounting groove of a thin layer of grease, coated with a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coated with a thin layer of grease.

Instrumentation needle valve

Instrument needle valves, instrument measuring the piping system is an important part of the main shut-off valve and ball valve, mainly used for cutting the pipe open or access available. Installation Notes: Valve must be visually inspected prior to installation, the valve plate should comply with existing national standards, "Universal Valve logo" GB 12220's. The outer surface of the instrument needle valve body also affected by atmospheric corrosion, general steel materials to paint to protect.

needle valves are designed and manufactured

needle valves are designed and manufactured to stringent international standards. They provide a simple way of allowing safe, reliable shut-off. We have a wide variety of different designs, shapes, and styles for you to choose from.
The needle valves feature:
1,Uniquely designed to provide fine flow adjustments for precise control;
2,Frequently used in conjunction with coolers, instrumentation, hydraulic, and pneumatic systems;
3,Compact and durable, these valves get the job done without taking up much space;
4,Available with a wide variety of connection configurations to fit your application;
5,Designed for maximum working pressure of 150 psi.

The virtue of the needle valve

The virtue of the needle valve is from the vernier effect of the ratio between the needle's length and its diameter, or the difference in diameter between needle and seat. A long travel axially (the control input) makes for a very small and precise change radially (affecting the resultant flow).
high pressure needle valves may also be used in vacuum systems, when a precise control of gas flow is required, at low pressure, such as when filling gas-filled vacuum tubes, gas lasers and similar devices.
Needle valves are usually used in flow-metering applications, especially when a constant, calibrated, low flow rate must be maintained for some time, such as the idle fuel flow in a carburetor.

A needle valve is a type of valve

A needle valve is a type of valve having a small port and a threaded, needle-shaped plunger. It allows precise regulation of flow, although it is generally only capable of relatively low flow rates.
An instrument needle valve uses a tapered pin to gradually open a space for fine control of flow. The flow can be controlled and regulated with the use of a spindle. A needle valve has a relatively small orifice with a long, tapered seat, and a needle-shaped plunger on the end of a screw, which exactly fits the seat.

Instrumentation needle valve Product Description

Instrument measuring Instrument needle valve  is an important part of the piping system, the main shut-off valve and ball valve, its function is to be used to turn on or off the pipeline path. Card sets with easy installation and removal instrument valves, connections are tight, there is conducive to fire, explosion and high voltage capability, good sealing performance, etc., are power plants, oil refineries, chemical plant piping and instrumentation to measure an advanced connection valve. Needle shut-off valve sealing good, long life, even after the sealing surface is damaged, only need to replace wearing parts, you can continue to use.

Needle valve selection principles

1 , the pipeline system and cryogenic medium , should use plus low bonnet needle valve .
2 , the pipeline system FCCU refinery unit , optional Needle valves lift rod .
3 , fixtures and piping systems , such as acid-base chemical systems in corrosive media , should use austenitic stainless steel , Teflon seat ring in stainless steel needle valve .
4 , metallurgical systems, piping systems or devices on the power system , petrochemical plants , urban heating systems in high-temperature medium , the choice of metal to metal seal Inconel needle valves .
5, the need for flow regulation , the choice of the worm gear , pneumatic or electric adjustment with a V -shaped opening needle valve . 6 , transmission mains oil, natural gas , it is necessary to clean the pipeline , buried in the ground and the need , use full bore , all-welded construction needle valve ; buried in the ground , choose full bore welded or flanged connections the ball valve.
7 , pipelines and storage facilities for refined oil products , the choice of needle valve flange connection .
8 , city gas and natural gas pipeline , the choice of the needle valve flange and the threaded connection .
9 , metallurgical oxygen pipeline system , should use rigorous degreasing treatment , needle valve flange connection .

FD-LOK offers a range of Instrument needle valve

FD-LOK offers a range of Instrument needle valve and Manifolds. The Instrument valves can be used for shutting off impulse lines or for isolation of pressure instruments. All valves are standard stainless steel and optional available in exotic materials.
Instrument Needle Valve
• Top entry design, allows parts removal without removing valve from line.
• One-pliece forged body, no gasket leaks.
• Integral hardened seats.
• Heavy duty, forged one-piece yoke for maximum rigidity.
• One-piece forged gland flange allows for packing replacements without disassembling valve.
• Corrosion resistant trim.
• Available in socket weld and threaded ends for pressures up to 6000 psig at 100ºF.

The stainless steel Ball and needle valve

The stainless steel Ball and needle valve, for fractional tubes, are used with most of Clean Air Engineering's instrumentation. The Ball and Needle Valve are designed for high pressure applications in a corrosive environment. For custom sizes, please contact a sales representative today. We stock a variety of sizes of Ball and Needle Valve and usually ships same day.
Product Type: Tube to Tube, Fitting, Ball valves, Needle Valve Fractional Tube
Ferrules: One Sleeve Ferrule
Applications: Water, Air, Steam, Natural Gas, Gasoline, Oil and Hydraulic Fluid.

The Instrument valves are compact and economical

The Instrument valves are compact and economical high pressure instrument valves. Panel manufacturers can use the standard panel nut to secure valves to instrument panel. All valves are available with integral hard seats, 316 stainless steel body and trim and Teflon/Grafoil packing. Valves are furnished with a panel mount nut. Needle Valves are designed to regulate flow to an instrument or other industrial application.  FD-LOK needle valve are rugged enough for the oil & gas market, and suitable for most industrial applications.  Available in a wide variety of connections.

An instrument needle valve

An instrument needle valve uses a tapered pin to gradually open a space for fine control of flow. The flow can be controlled and regulated with the use of a spindle. A needle valve has a relatively small orifice with a long, tapered seat, and a needle-shaped plunger on the end of a screw, which exactly fits the seat.
The virtue of the needle valve is from the vernier effect of the ratio between the needle's length and its diameter, or the difference in diameter between needle and seat. A long travel axially makes for a very small and precise change radially .
Needle valves may also be used in vacuum systems, when a precise control of gas flow is required, at low pressure, such as when filling gas-filled vacuum tubes, gas lasers and similar devices.

FD-LOK needle valve has 10 different types

FD-LOK needle valve has 10 different types. SS needle valve have several tips can be choosed, such as Blunt Tip, Regulating Tip, Stainless steel needle valve,Soft Tip and Non-rotating Tip. Angle needle valve, we offers a wide selection of Instrument needle valve including needle shutoff & regulation valve, mini needle valve, total 10 series for variety using environment.
Stainless Steel Needle Valves feature a panel mountable, two piece design allowing for flexibility duringinstallation. High quality valve packing provides a leak-tight double seal with low operating torque and the safety backseatingprevents accidental removal of the stem.
Our Check valve and needle valves are available in various materials, such as stainless steel (304/316), carbon steel and cast iron.  Sizes of our valves range from 1/4" up to 48" and beyond for custom applications.  Our check valves and needle valves are ideal for water, oil, gas, chemical (compressed gases) and air (compressed air and blower).  We also carry Y-strainers which are listed below.  Our check and needle valves are ARRA compliant and always shipped out of our USA factory location.  If there is a valve you have question on, or if you do not see a valve that meets your specifications, please contact our sales staff for immediate assistance.

FD-LOK needle valves designed in varied sizes

FD-LOK make needle valves come in bar stock as well as in forged construction various sizes, sealing styles, end connections and stem types. Main feature of Needle valves is that its stems are interchangeable with any of its valves of the similar configurations thus resulting in low cost and less inventory.We offer a range of needle valve that are fabricated from qualitative raw material and are as per the international standards.
They are designed in varied sizes ranging 1/8” To 2” (3 mm To 50 mm) and are designed as:
1.Straight and angle pattern;
2.Precision machined stainless steel stem;
3.Rugged and Compact Square forged body;
4.Longer life with minimum maintenance;
5.Low operation torque;
6.Valves with double flared tube fitting.

Instrument needle valve widely used in many industries

Instrument needle valve widely used in many industries, Mac-Weld high pressure FD-LOK Instrument needle valve provide quality and reliable function to throttle, regulate and isolate gaseous and aggressive non-viscous liquid services. Mac-Weld Gauge Root Valves offer multifuction capability to isolate, calibrate and vent gauge, pressure switches and static instrument applications.
Instrument needle valves incorporate high quality needle valves designed to operate at pressures up to 6000 psig with standard PTFE gland packing. The packing is positioned below the stem threads to ensure no contact between system process and the stem threads. The upper gland body is tightened and secured into position by a lock nut. The lower gland body is directly screwed into the component body and secured into place to prevent accidental loosening of the gland body during operation.

Stainless Steel Needle Valves Featuring

The World's most comprehensive range of FD-LOK Instrument needle valve. The Waverly brownall needle valve range is designed and manufactured to the highest standards to meet the requirements of the severe applications anticipated for these valves. They have a split stem design, which ensures accurate seating, and a bubble tight seal. They are general-purpose valves for use on liquid or gas applications where the isolation of flow, equalisation and venting of pressure are the main criteria. The Waverly brownall needle valve is avaliabe ex stock with a variety of end connections from 1/4" to 3/4", giving any combination of ends from NPT, BSPP, BSPT, Single and Twin ferrule OD compression. They are avaliable for application up to 10,000 psi and temperatures up to 400 degrees centigrade.

needle valves are designed to regulate flow

needle valves are designed to regulate flow to an instrument or other industrial application.  PIC Gauges needle valves are rugged enough for the oil & gas market, and suitable for most industrial applications.  Available in a wide variety of connections in 316 stainless steel and carbon steel bodies, PIC Gauges has most common configurations in stock for immediate shipment.
stainless steel needle valves are suitable for most process applications, however "exotic" materials are also available.

The instrument valves can be used

The instrument valves can be used for shutting off impulse lines or for isolation of pressure instruments. All valves are standard stainless steel and optional available in exotic materials. This valve has a non-rotatable conical tip to ensure perfect alignment. Badotherm valves are manufactured within the European Union.
Please make a selection from our high-performance bar-stock needle valves in various materials or our range of rugged instrument manifold valves. They are suitable for isolation, bleeding, calibration, and testing of pressure instruments.

simple needle valves are often used

Since flow rates are low and many turns of the valve stem are required to completely open or close, high pressure needle valves are not used for simple shutoff applications.
Since the orifice is small and the force advantage of the fine-threaded stem is high, needle valves are usually easy to shut off completely, with merely "finger-tight" pressure. The spindle and/or seat of a needle valve, especially one made from brass, are easily damaged by excessive turning force when shutting off the flow.
Small, simple needle valves are often used as bleed valves in water-heating applications.
Unlike a ball valve or valves with a rising stem, it is not easy to tell from examining the handle position whether the valve is open or closed.

Needle valves are usually used in flow-metering applications

needle valves are usually used in flow-metering applications, especially when a constant, calibrated, low flow rate must be maintained for some time, such as the idle fuel flow in a carburetor.
the float Angle needle valve of a carburetor (controlling the fuel level within the carburetor) is not a needle valve, although it is commonly described as one. It uses a bluntly conical needle, but it seats against a square-edged seat rather than a matching cone. The intention here is to obtain a well-defined seat between two narrow mating surfaces, giving firm shutoff of the flow from only a light float pressure.

An instrument needle valve

An instrument needle valve uses a tapered pin to gradually open a space for fine control of flow. The flow can be controlled and regulated with the use of a spindle. A needle valves has a relatively small orifice with a long, tapered seat, and a needle-shaped plunger on the end of a screw, which exactly fits the seat.
As the screw is turned and the plunger retracted, flow between the seat and the plunger is possible; however, until the plunger is completely retracted, the fluid flow is significantly impeded. Since it takes many turns of the fine-threaded screw to retract the plunger, precise regulation of the flow rate is possible.

A needle valve is a type of valve

A needle valve is a type of valve having a small port and a threaded, needle-shaped plunger. It allows precise regulation of flow, although it is generally only capable of relatively low flow rates.
The virtue of the High pressure needle valve is from the vernier effect of the ratio between the needle's length and its diameter, or the difference in diameter between needle and seat. A long travel axially (the control input) makes for a very small and precise change radially (affecting the resultant flow).
Needle valves may also be used in vacuum systems, when a precise control of gas flow is required, at low pressure, such as when filling gas-filled vacuum tubes, gas lasers and similar devices.

Stainless steel needle valve Installation notes

Stainless steel needle valve Installation notes:
1, the installation position, altitude, direction and export must meet the design requirements, pay attention to the direction of media flow valve should be consistent with the direction of the arrow mark, the connection should be firmly tight.
2, must be visually checked before the Check valve is installed, the valve plate should be consistent with existing national standards.
3, for the working pressure greater than 32.0 MPa and the role played off valves on the main pipe, the installation should be carried out before the strength and rigorous performance tests, passing behind the prospective use.
4, the strength test, the test pressure for the nominal pressure of 1.5 times the duration of not less than 5min, the valve housing, packing should be no leakage in compliance.
5, when the tightness test, the test pressure of 1.1 times the nominal pressure; test duration in line with national standards.

Stainless steel needle valve selection principles

Stainless steel needle valve selection principles:
1, the pipeline system and cryogenic medium, should use low temperature plus bonnet SS needle valve.
2, the pipeline system FCCU refining apparatus, the choice of needle valve lift rod.
3, apparatus and piping systems of chemical systems and other corrosive acid medium, should use austenitic stainless steel, Teflon seat ring of stainless steel needle valve.
4, metallurgy systems, piping systems or devices on power systems, petrochemical plants, urban heating systems in high-temperature media, the choice of metal seal needle valve.
5, transporting oil products pipelines and storage facilities, the choice of the needle valve welded connection.
6, city gas and natural gas pipelines, the choice of the needle valve flange connection and female connection.
7, oxygen pipeline system, should be strictly degreased.

Selection principles stainless steel needle valve

Selection principles Stainless steel needle valve
1, the piping systems and devices require cryogenic medium, the best selection of plus bonnet cryogenic needle valve.
2, the pipeline system FCCU refining device, you can use the lift needle valve.
3, apparatus and piping systems of chemical systems and other corrosive acid medium, the best selection of austenitic stainless steel valve seat ring of stainless steel needle valve.
4, during the time flow regulation, to use traditional worm, pneumatic or electric with a V-shaped opening regulating needle valve.
5, city gas pipeline and natural gas, use thread connecting flange connections and needle valve.

Needle valve principle and characteristics

Material needle valve is generally used by the steel constructed, but there are seals made using a copper alloy valve head. and so. Before using the needle valve. It should open the inspection valve head and seat material. U-turn in order to prevent the use of the process or wear phenomena occur. In the fermentation process, the increased use of Stainless steel needle valve, to ensure strict degree play a role.
Features needle valve is:
(1) withstand high temperatures, high pressure and difficult to corrosion.
(2) Easy to trace the flow rate and flow control plus, dropping feeding.
(3) easy to operate, easy to replace, easy maintenance.

Disadvantage exists needle valve

Disadvantage exists needle valve
(1) easy to damage, especially easy to turn the valve head.
(2) because of the small structure, small channels, it is easy to be blocked.
With cut-off valve should pay attention to the mounting direction of the needle valve installation. And medium flow must coincide with the stainless steel needle valves is installed to maintain the packing at the needle valve closed when not affected by media pressure and leakage. In connection with the fermentation tank installation. We must pay attention to the fermentation tank being installed, to prevent the broth from the packing seal leakage and contamination.
Industrial production in the fermentation process, the needle valve is widely used in fuel control valve, red depending on the mirror steam valve, the steam control valve manifold material, the air blowing port on each valve, as well as sampling tubes on each control valve. These places need both easy maintenance and replacement, at the same time they need to withstand high temperatures and pressure. Controlling the flow rate, the valve flow. Needle valve just adapted to these requirements.