An impactor handwheel has a crossarm that is directly coupled to the valve stem. The handwheel pushes against the crossarm to apply the torque.

Recall that this API 600 requirement is for a wedge gate valve. As the name implies, a wedging force is used to accomplish sealing. To accomplish the minimum seating force for sealing.

Looking for the proper type of valve to install to bleed pressure off water mains when they have to be taken down for maintenance.

A plug valve of double eccentric type will have a long lifetime, no threaded parts exposed for liquid parts (as common for gatevalves) and possibillities for throtteling and simple automation over gea

Talking about advantages and disadvantages when compared to a traditional wedge gate valve.

When a parallel-disc gate valve seats, there is a wedge between the discs that drives them outwards to snug against the seats. It is theoretically possible to trap a volume of liquid between the disc

If you throttle with a gate valve, a swirl is set up that scrubs the back side of the gate. The gate can be eroded. How much damage and how fast it occurs depends on the fluid and pressure drop across

In this standard, OSHA provides a couple of relevant definitions:"Isolation means" the process by which a permit space is removed from service and completely protected against the release of energy an