Gate valve testing and maintenance - AMARINE

1- Purpose of using Gate Valve on stream

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Gate Valve is used to open and close the flow only. Not commonly used in flow control with the following components.

2- Operation (open-closed) of Gate Valve

3- The Hydrostatic Test for Gate Valve requires 3 parts, Shell, Seat, and Backseat 

The hydro-testing according to API 598. The valve standard is ASME B16.34

***Gate Valve – Hydrotest Backseat; 

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The Hydrostatic Backseat Test must be tested at a pressure of not less than 1.1 times the Maximum Operating Pressure by fully opening the valve and releasing the gland of the gate valve to check for leaks through the Backseat.

***Gate Valve – Hydrotest Shell; 

Hydrostatic Shell Test must be tested at a pressure not less than 1.5 times the Maximum Operating Pressure by opening the valve partially open and tightening the gland to get the pressure. Then check for leaks through Shell.

***Gate Valve – Hydrotest Seat; 

Hydrostatic Closure Test or Seat Test, continue to test from Shell Test at the pressure not less than 1.1 times of Maximum Operating Pressure by closing the valve fully closed and then checking the leak through Seat and Disk. Both tests must be done on two (2) – Side of Gate Valve.

***Valve – Pressure Test Duration; 

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Hello Gentlemen,
I need to get some information about gate valve testing. I'm working on PSL 2 and PSL 3 PSI WP valves and I need to modify the test procedures to comply with API 6A Specification. Up to now we performed the hydro test at the Working Pressure. I need to upgrade the system and I got a couple of questions for you:
1) May I use the test flanges with 1/2" NPT ports to hydro test the body at PSI?
2) In case of not compliance of the above mentioned thread which is the more suitable?
Any helps will be appreciate. In I used Harwood Engineering in Walpole, MA for test rig valves/fittings/tubing to test API valves at 30,000 psi shell and 20,000 seat. The test rig itself we designed to 30,000 psi and hydroed to 45,000 psi. We were very satisfied with their performance. Their url is