Control Valve Parts: The Basics

control valve parts

In oil and gas production, a control valve is a piece of equipment that controls the flow of liquid or gas.

What are the Important Control Valve Parts?

Here is a look at some of the key internal parts of our pneumatic Stem-Guided High Pressure Control Valve. These are linear valves that have a stem that guides the ball into the seat.

They can operate in modulating control or on/off applications.




The bonnet is the top of the valve, which houses the diaphragm and actuator spring.


The spring holds tension on the stem, keeping the valve in its fail position.

Control Valve Actuator

The control valve actuator receives a pneumatic signal from a pressure pilot or another pneumatic controller and adjusts the valve position accordingly. This actuator can be disassembled and inverted to convert the valve from fail-closed to fail open or visa versa.

Stuffing Box Assembly

The stuffing box assembly houses the valve packing. The valve packing provides a seal that prevents leakage from the stuffing box while allowing the stem to move up and down as needed to open and close the valve.

Yoke and Travel Indicator

The yoke and travel indicator give a visual identification of the valve’s position at any given moment.

Stem and Seat

The ball and seat are what block off the flow through the valve. These are vital pieces and also the items most susceptible to wear and tear from contact with abrasive or corrosive production.

To learn more about control valves and how they can help your operation schedule a training session with your local Kimray store or authorized distributor.

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