# How to perform a pressure test for valves?

**URL:** <https://forumautomation.com/t/how-to-perform-a-pressure-test-for-valves/2484>\
**Category:** Valves\
**Tags:** instrumentation, flowmeasurement\
**Created:** [October 20, 2017, 6:36pm UTC](https://forumautomation.com/t/how-to-perform-a-pressure-test-for-valves/2484 "2017-10-20T18:36:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [October 20, 2017, 6:36pm UTC](https://forumautomation.com/t/how-to-perform-a-pressure-test-for-valves/2484/1 "2017-10-20T18:36:16Z")

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A pressure test is performed to ensure that the packing is sealed perfectly so that there cannot be any leakage through the valve.

For a control valve, a small amount of leakage is allowed as they move up and down, for a gate valve the sealing must be perfect at it’s rated pressure.

 ![](https://cdn.forumautomation.com/original/1X/0be180557349239d570b47ade6839065249738b2.png)

For every valve, there is maximum working pressure. The pressure test is done till this maximum pressure.

Here the pressure test for a gate valve is described:

- Seal the outlet of the valve using a blanking plate, so that fluid cannot flow through.

- Connect the pressure test rig at the inlet of the valve.

- Fully open the valve.

- Operate the hand pump of pressure test rig until the maximum pressure, water can be used as pressurising liquid.

- If the water didn’t leak out, then the seal is perfect. As the test is done in fully opened condition then the valve will work fine in fully closed condition.

- And if there is a leakage in the seal, open the depressurising valve and tight the packing.

- Then repeat the pressure test until the valve is leak free.