FCV Flow Control Valve

FCV Flow Control Valve

The job of a flow control valve (FCV) is to adjust the flow of air, gases and liquids. The Proportion-Air FCV flow control valve goes beyond that by pneumatically controlling the position of a valve off the seat. This angle seat valve can control hydraulic media in a closed-loop proportional Cproduct without adding anything to it.

It does this by controlling the position of the plug off the valve seat. The output is linear and directly proportional based on command signal input, due to a parabolic design of the plug.

The FCV flow control valve is a high resolution device, providing a resolution of ±0.3 percent of a full stroke (full stroke = one inch).

It compares the command signal input from a customer’s computer or PLC with feedback from a built-in electronic linear variable differential transducer (LVDT).

NPT Connection
Linearity ±
Max P2 (PSI)
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Technical Specs

Max Working Pressure250 PSI (17.2 Bar)
Linearity±5% F.S.
Resolution±0.3% F.S.
End Connections1″ NPT Threaded
Min Load Pressure80 PSI (5.5 Bar)
Max Load Pressure120 PSI (8.25 Bar)
Valve Cv0-19 Linear to Command
Valve Kv0-16.4 Linear to Command
Wetted Materials316 SS & Reinforced PTFE
Ambient Temp32-158˚F (0-70˚C)
Media TempMax: 356˚F (0-180˚C)


File Request Form: Use this form to request a file other than a standard FCV .STEP file

Submit the form below to download FCV .STEP file

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FCV | 1″ Electronic Angle-Seat Valve | View 3D Model

The FCV flow control valve is an electro-pneumatic proportional angle seat valve that employs a parabolic valve plug so that the area of the valve opening is proportional to the valve position.

For Example: if the valve position is 50% of full stroke, the valve Cis 50% of maximum rating. The valve position is electronically closed-loop controlled, with an LVDT that provides continuous feedback to the control module. The LVDT and control module are integral to the valve actuator.

80-120 PSI is required to control the FCV actuator loading pressure.

The FCV flow control valve features status indicating LEDs for power and TTL. When the FCV is at position (within the deadband), the TTL is active low (0 VDC) and the green LED is on.

RECALL NOTICE: If you have an FCV with a serial number between 1202402 and 1224882, please contact us for information on a product recall.

FCV Maintenance Advantages

We don’t use standard packing; instead, a double radial lip seal replaces standard packing.

Over time, as the packing wears, liquid drips out the side of the valve. To maintain integrity, you need to tighten by squeezing the packing and eventually you’ll get to the bottom threads of the packing nut. At that point, you must take the flow control valve apart and repack it. The Proportion-Air flow control valve design is superior with its double radial lip seal.

Easy Replacement Process

Obviously, any seal will eventually wear. When that happens, we have a weep detection port. If you see moisture, you know to replace the double lip radial seal – and the good news is, that’s an easy process.

With our FCV flow control valve, there’s no need to remove the body from the pipe. Instead, you simply put a wrench on the flat spots where the port is, take out the top actuator and remove the trim part of the plug. Remove the seat disc and slide the double radial seal off the shaft, then slide the new one on – and in minutes you’ve replaced a leaky seal!

With packing nuts of other designs this would be a major rebuild – and one that must be done during a shut down. Repairs on our FCV flow control valve are accomplished in minutes – and can be done right before a shift change.

Replaceable Seat Advantage

Most process valves have a valve seat actually molded into the valve body. Our seat is replaceable.

With our product, if something damages the valve seat, you can order another and replace it within minutes. Other valves with a damaged seat go straight to the recycling bin and must be entirely replaced. It’s just another value added advantage of a Proportion-Air FCV Flow Control Valve.