1. What is OS&Y type in a valve?

In Gate valve OS&Y stands for outside stem and yoke, this is most commonly used valve.

2. What is yoke?

A Yoke connects the valve body or bonnet with the actuating mechanism.

3. What is a yoke nut?

A Yoke nut is an internally threaded nut and is placed in the top of a Yoke through which the stem passes.

4. What is fail-close, fail-open, fail-safe?

Fail safe is a position which valves attain in case of a failure of Actuating force.

Fail-close: In-case failure of actuating force, valve gets automatically closed; this is the most common and widely required position.

Fail–open: In-case failure of actuating force, valve gets automatically open, for ex. Coolant which ensures temperature of media does not cross certain prescribed levels.

5. What is a Cv in a Valve?

Cv is a flow coefficient of a valve, it gives us an idea of discharge capacity of a valve. Higher the Cv higher is the discharge capacity.