Valve type for release of high pressure

[eyeconz]

What is the common desired valve type for releasing high pressure?

I have a system to pressure test assemblies in the oil and gas industry, and I’m getting mixed information from valve suppliers on selection of a valve to dump the pressure after the test is complete.

Max 15,000psi / water or gas test / Max 1 gallon of water thru dump valve.

Some say a ball valve is to fast a release to dump the pressure for safety concerns, while others say a needle valve will just wash out to quickly. I'm currently using an Autoclave Enginners angle needle valve, works great, but does wash-out after 40 - 50 tests.

Any comments / thoughts?

Thanks
Dusty

 

[JLSeagull]

Consider a ball valve operated open/closed with a choke downstream for the pressure drop.

 

[BigInch]

Are you sure? No way I would use a ball valve for 15000 to atmosphere, choke or not.
Suggest,

http://www.fmctechnologies.com/SurfaceWellhead/Valves/Series100Valves.aspx

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[Ashereng]

For steam letdown, we have used CCI tortuous path valves. Expensive. Very expensive.

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[JLSeagull]

OK, 15000 psi is really high - likely eliminating any ball valve.

 

[BigInch]

I'd have confidence in the FMC wellhead valve.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[unclesyd]

The link below is to a very good high pressure valve company. I would stick with needle valves since they are relatively inexpensive compared to any other type.


Look under "Ball Valves" at the following site, either the 2-Way or Diverting Valve.

http://www.butech-valve.com/

Look under Valves.

http://www.barton.com/ultra_high_pressure_parts.cfm

 

[abscott]

EYECONZ,
Since you are passing a small volume intermittantly the Autoclave Engineers needle valve, or similar, is probably the most cost effective. I suggest you talk with the supplier and see if you can get hardfaced (Stellite) seats and plugs. This will increase the service life cosiderably and reduce you repair and overhead costs.
Regards,
ABScott

 

[unclesyd]

You might want to give these people a call about their Dyna Valve. Haven't used or seen it used but the company has a good reputation in the industry.

http://www.aqua-dyne.com/Products/Accessories/dyna_valve.htm

 

[metalonis]

Another option would be found at

http://www.highpressure.com

 

[surfdancer]

A back pressure regulator can also be used

 

[grampi1]

Be sure to consider the noise, vibration and JT effects.