Valve

The Check valve is in fluid system, a device used to control the direction of the fluid flow, pressure, is to make the piping and equipment within the media (liquid, gas, powder) device for controlling the flow of energy flow or stop and the.
The Instrument valves is a pipeline control unit of fluid delivery system, which is used to change the channel section and flow direction of medium, with diversion, cut-off, throttling, check, diversion or overflow relief functions. For fluid control valves, valve from the simple to the extremely different kinds of valve control system used in complex, its many varieties and specifications, the valve nominal diameter pipeline industry from large to tiny instrument valve diameter up to 10m valve. Can be used for the control of water, steam, oil, gas, mud, all kinds of corrosive medium, the liquid metal and radioactive fluids and other types of fluid flow, the valve working pressure is from 0.0013MPa to 1000MPa of ultra high pressure, working temperature from ultra low temperature to high temperature of 1430 DEG C -270 C.
The control valve can use a variety of transmission, such as manual, electric, hydraulic, pneumatic, pneumatic turbine, electromagnetic, electromagnetic hydraulic, electric hydraulic, pneumatic and hydraulic, gear, bevel gear drive; in pressure, temperature or other forms of sensor signals under the action, according to the requirements, or not depends on the sensing signal and a simple open or closed, the valve to rely on drive or automatic mechanism to make the opening and closing parts for lifting, sliding, rotating or turning motion, so as to change the size of the flow area to achieve the control function.

Valve advantages

1 fluid resistance small, the drag coefficient with the same length of pipe equal.
2 has the advantages of simple structure, small volume, light weight.
3 closely reliable, current High pressure needle valve sealing surface material widely used plastic, good sealing performance, in the vacuum system has also been widely used.
4, the operation is convenient, quick open and close, from fully open to fully closed as long as the rotation of 90 DEG, facilitate remote control.
5 ball Valve manifolds has the advantages of simple structure, convenient maintenance, seals are generally activities, the removal of the replacement is more convenient.
6 in the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, through the media will not cause erosion of the valve sealing surface.
The 7 is suitable for a wide range, from small diameter to a few millimeters, a few meters from the large, high vacuum high pressure can be applied.

Conditions Instrument needle valve inspection

Instrument needle valve is a simulation test in the normal state. This state should be able to cover all water department environment. Dynamic test valve executive function Another very important point is that the test voltage, what kind of voltage the most appropriate? High pressure ball valve Smart meter in every one has a same function, that is, when the battery voltage is below the set value, the microcontroller will command the valve closing function is activated,Valve manifolds when the battery voltage is the lowest in the smart meter voltage Instrument needle valve, also that is, the final action is the lowest setting off valve in the battery voltage. The task of the truth is by reversing valve to the valve dredge or occlusion. Instrument needle valve switch is lightweight, small size, can be made very large caliber, reliable sealing, simple structure, Instrument needle valves convenient maintenance, regular spherical surface and seal in the closed condition, can not easily be eroded media, in all sectors lost universal use.

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.

The classification of ball valve

One, floating ball valve
Ball High pressure needle valve ball is floating in the medium under pressure, can produce some displacement of the sphere, and pressed in the export side of the sealing surface, to ensure that the exit seal. Floating ball valve structure is simple, good sealing, but the ball under the load of all media work to export ring, so to consider the ring material can withstand the work load of the media sphere. This structure, widely used in low-pressure Stainless steel needle valve
Two, fixed ball valve
The ball valve is fixed, no movement after compression. Fixed with a floating ball valve ball valve seat, by the media pressure, the valve seat have a mobile, so that the sealing ring is pressed on the sphere, in order to ensure the sealing. Usually with the ball in the upper and lower shaft with bearings, operating torque, suitable for high pressure and large diameter of the valve. In order to reduce the valve operating torque and increase the reliability of the seal, valve seal has emerged in recent years, both pressure lubricating oil special note in the sealing surface, to form a layer of oil film, which enhances the sealing, and reduce operating torque, more suitable for large-diameter high-pressure valve.
Three, elastic ball valve
The ball valve is flexible. Ball and valve seat rings are made of metal materials, sealing pressure than the large, rely on the media itself can not seal the pressure has reached the requirements must be imposed by external forces. This valve is suitable for high temperature and high pressure medium. Elastic sphere is a flexible open slot in the sphere of the bottom wall, and get flexible. When the closed channel, with the stem of the wedge-shaped head to open up the ball with the valve seat to seal compression. In the rotating sphere before loose wedge head, ball the subsequent restoration of the original prototype, so that a small gap between the ball and the valve seat sealing surface can reduce friction and operating torque.

Trunnion ball valve using the principles of

Trunnion ball valve is guaranteed by the pressure poorly. Flat stack valve to valve flatness and smoothness requirements friction plane quite high, and the requirements for the use of materials Instrument needle valve also have high demands. To solve these problems, flat lamination stack valve using a ceramic substrate under the topsheet other using a high-strength wear-resistant material, in full accordance with the principles of chemical mechanical seal manufacturing and processing, both to ensure a reasonable contact surface, and ensure the minimum coefficient of friction. Trunnion ball valve has emerged cause Valve manifolds quality problems due to prolonged blockage of the pilot hole, the pressure relief valve stem causing the valve stem is stuck adsorption of iron particles and other issues, through the use of market information and feedback, developers have learned Trunnion ball valve actuators Division is currently unsuitable water quality of water use. Thus, the developers turned to the ball and flat stack valves. Now use the ball a little more.

Globe valve

Ball valve driven by the stem, and around the Trunnion ball valves axis rotate valve. Can also be used to regulate and control fluid, strong shear force between the metal seat which seal V type ball Instrumentation ball valve of the V type ball core and hard surfacing alloy, especially suitable for containing fiber, small solid particles and other media. Switch and multi way valve in the pipe can flow, diversion, and flows to the flexible control of media, but also to turn off any channel and the other two channels connected. The valve should be installed in the pipeline in the general level of. Valve classification: pneumatic valve, electric valve, manual valve.

Instrument needle valve structure principle of

Key Instrument needle valve seal structure is due to the way the valve drive using triggered, if the valve actuator seal structure to improve the way you can solve the leakage problem and lead to Double ferrule fitting the loss of technical issues valve actuator functions. Mechanical seal is a dynamic seal, widely used in the chemical industry. Instrument needle valve structure is simple, small size, resistance to fluid flow is also small, problems are open or closed too quickly, it will occur in the pipeline water hammer (water flow rate in the pipe when the pressure Instrument valve manifolds is reduced suddenly change). Instrument needle valve and thus should not be taken on the backbone tube valve can be used in the dry end of the branch pipe, or for wash-use, flushing sewage good consequences.

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.