# Control valve parts

**URL:** <https://forumautomation.com/t/control-valve-parts/111>\
**Category:** Valves\
**Created:** [October 3, 2014, 1:47pm UTC](https://forumautomation.com/t/control-valve-parts/111 "2014-10-03T13:47:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![instrumen](https://forumautomation.com/letter_avatar_proxy/v4/letter/i/65b543/32.png) [@instrumen](https://forumautomation.com/u/instrumen)\
**Post date:** [October 3, 2014, 1:47pm UTC](https://forumautomation.com/t/control-valve-parts/111/1 "2014-10-03T13:47:18Z")

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a) Trim b) CV c) Actuator d) Stem travel e) Valve body f) Yoke g) Gland packing

Trim : Trim is a matched pair of ‘plug’ and ‘seat’ CV : The amount of water flow in gallons through the control valve when the valve port is fully open and the pressure differential across the valve is 1 Psi. Actuator : The drive unit having a diaphragm and a piston that operates the valve stem. Stem travel: The scale that shows the stem movement in inches or centimeter. Valve body: The bottom portion of a control valve installed on a pipeline to control a process. The valve body contains a trim, pipe flange, bonnet, gaskets, guide bush, gland packing, lantern ring, grease, cooling fins…etc. Yoke : A portion of the actuator which connects the actuator to the valve body carrying a stem travel plate. Gland packing: A sealing system in the valve body which prevents the process fluid coming out through the valve stem.