Rising stem gate valve

[sowhatso]

Dear All ,

I have two questions :

For buried application , is it OK to use Rising stem gate valve ??

Can we install rising stem gate valve with actuator , is it standard to connect the actuator with rising stem gate valve or actuator is only working with non rising stem gate valves ??

 

[zdas04]

By "buried application" are you burying the valve or the pipeline (i.e., will be valve be in a vault or valve can)? You can do either, but without a valve can you need a special bonnet that lets the remote actuater spin without contacting dirt and accomodates the rising stem. I've never seen one of these, but then I don't bury gate valves in my practice (they're rarely the best choice for gas applicatons).

Yes, they make multi-turn actuators in both pneumatic and hydraulic for gate valves. Most are fail-as-is because it is difficult to store enough energy to close (or open) a valve 50-150 turns on a failure of motive power.

David Simpson, PE
MuleShoe Engineering

http://www.muleshoe-eng.com

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

The harder I work, the luckier I seem

 

[leecoop]

This is very common for our company. You can install a spring or double acting linear pneumatic or hydraulic piston actuator on the buried gate valve using a threaded coupling block that pulls instead of turns. You can use the media in the pipeline to provide the operating pressure for the actuator. (many control possibilities)