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.