A sliding-stem valve body is one where the moving parts slide with a linear motion. Some examples of sliding-stem valve body designs are shown here:
Most sliding-stem control valves are direct acting, which means the valve opens up wider as the stem is drawn out of the body. Conversely, a direct-acting valve shuts off (closes) when the stem is pushed into the body. Of course, a reverse-acting valve body would behave just the opposite: opening up as the stem is pushed in and closing off as the stem is drawn out.
Also Read : Disassembly of a sliding-stem Control Valve
- Direct & Reverse Acting Control Valves
- Self-Actuated Valves, Pneumatic & Hydraulic Actuators
- PID Controller Action : Directing Acting & Reverse Acting
- Pneumatic Valve Positioner Working Principle
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- Rotary Stem Valves
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- What is Split Range Control Loop ?
- Control Valve Actuators
- Control Valve Actuators – Pneumatic