I have two questions :For buried application , is it OK to use Rising stem gate valve ??

A potential problem in one of our quick close valves was brought to my attention. During normal operation, the actuator to the main valve is held closed by an 80 psi instrument air line.

Can anyone tell me why chromium plated ball valves may not be acceptable in a refining environment?

What is the main reason to use Y-pattern globe valves?

I am trying to determine the actuator torque required for my metal seated, eccentric (meaning offset) butterfly damper.

In fact Velan recommend 10D.The reason is that there can be turbulence from the pump that increases the wear of a check valve and lead to its failure.

When a piping line specification requires 6mm of corrosion allowance, do you consider necessary to indicate this requirement also for valve description?

Can the flow direction on this type of globe valve be in either direction? The service is liquid oxygen with this valve located on the upstream side of the liquid oxygen vaporizers.