Valves

Question 1

What is the purpose of a valve?

Answer 1

Valves and cocks provide a method of controlling flow of a liquid or gas, and as a means of isolating the various systems and components.

Question 2

Name 8 valves.

Answer 2

Globe.
Gate.
Flap.
Saunders.
Ball seated cock.
Pressure relief.
Reducing.
Non-return.

Question 3

Name 3 types of non return valve.

Answer 3

Globe.
Piston.
Flap.

Question 4

Explain pressure relief valves.

Answer 4

Valve kept shut by spring.
If pressure exceeds pressure of spring, it will open allowing pressure to escape.
Protects the system from over pressurisation.

Question 5

Explain reducing valves.

Answer 5

Accepts high pressure entering it and allows substance to expand, reducing the pressure.

Question 6

Explain non return valves.

Answer 6

Only allow a substance through one way.
Valve shuts if pressure of flow is going in the other direction.
They prevent flow reversal.