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Control Valve · Glossary

What is Stroke Time?

seconds to open or closeControl Valve

Stroke time is the time a valve takes to move from fully open to fully closed, or the reverse, after a command.

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Stroke Time Explained

For shutdown valves, stroke time must be shorter than the process safety time allows. For control valves it affects how fast the loop can respond.

Stroke time depends on actuator volume, supply pressure, tubing and the flow capacity of solenoids, positioners, boosters and quick exhausts.

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Calculators for Stroke Time

CalculatorActuator Stroke Time CalculatorFree online calculator with formula and worked example.CalculatorVolume Tank Sizing CalculatorFree online calculator with formula and worked example.

Free Downloads

Free downloadESD Valve Stroke Test Report FormatFree download in Excel and PDF.Free downloadESD Valve Proof Test ProcedureFree step by step procedure, Word and PDF.

Frequently Asked Questions

What is Stroke Time?

Stroke time is the time a valve takes to move from fully open to fully closed, or the reverse, after a command.

How is stroke time measured?

From command to limit switch, or from trend data, during a full stroke test.

Why does a valve close slower over time?

Blocked exhaust ports, sticky packing or failing solenoids. Trending stroke times reveals degradation.

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Related Terms

Valve termPartial Stroke TestingPartial stroke testing moves a shutdown valve a small amount, typically 10 to 20 %, to prove it is not…Valve termVolume BoosterA volume booster is a pneumatic relay that copies the positioner output at much higher air flow, to…Valve termFail Safe PositionFail safe position is the position a valve goes to on loss of air or signal: fail open, fail closed or…

More Control Valve Terms

Valve termGlobe ValveA globe valve is a linear motion valve where a plug moves towards or away from a seat; it is the classic…Valve termButterfly ValveA butterfly valve is a quarter turn valve with a disc that rotates in the flow path; it is compact and…Valve termBall ValveA ball valve uses a rotating ball with a bore to control or stop flow; segmented V ball designs are used…Valve termValve TrimValve trim is the set of internal parts in contact with the flow that control it, such as the plug, seat,…Valve termValve PackingValve packing is the seal around the valve stem that stops process fluid leaking out while allowing the…Valve termControl ValveA control valve is a power operated valve that varies flow in response to a signal from a controller, to…

All control valve terms · Full glossary A to Z

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