CFESA Steam Training. Steam Valves
What kind of seats should be used in Globe valves used on steam applications? -
answer Metal seats should be used in Globe valves used on steam applications
What kind of washers must be used on Globe valves used in steam applications? -
answer Fiber or Teflon washers must be used on Globe valves used in steam
applications
The two different types (shapes) of Globe valve washers are: - answer Flat and beveled
A needle valve is used to: - answer Needle valve is used to manually regulate water
flow
Which valve body material is best suited to steam and why? - answer Iron or steel valve
body material is best suited to steam because they will reduce electrolysis from mixing
metals and water
When discussing valves, the term "full port" means: - answer"Full port" refers to the seat
portion of the valve being virtually the same size as the inlet and outlet openings of the
valve
When are full port valves needed? - answerFull port valves are needed when reduced
flow volume could create operational problems
Explain what could happen to gate valves when they are in a partially open position -
answerGate valves are subject to problems when in a partially open position such as
the gate portion of the valve vibrates and chatters when in a partially open position
If a valve is going to be needed to throttle a flow, what type of valve should be used? -
answerIf a valve is going to be needed to throttle a flow, either a needle valve or a ball
valve are the types that should be used
Where are quick opening gate valves often found in steamers? - answerThe quick
opening gate valves are often found in the steam inlet valves on older pressure steamer
cooking compartments
Describe the operation of a ball valve - answerA ball valve has a metal ball with a hole
bored through it, compressed between to plastic or teflon seats to prevent leakage. The
valve is fully opened or closed by rotating the handle 90 degrees
Seal rings on ball valves are made of: - answerPlastic or Teflon
What kind of seats should be used in Globe valves used on steam applications? -
answer Metal seats should be used in Globe valves used on steam applications
What kind of washers must be used on Globe valves used in steam applications? -
answer Fiber or Teflon washers must be used on Globe valves used in steam
applications
The two different types (shapes) of Globe valve washers are: - answer Flat and beveled
A needle valve is used to: - answer Needle valve is used to manually regulate water
flow
Which valve body material is best suited to steam and why? - answer Iron or steel valve
body material is best suited to steam because they will reduce electrolysis from mixing
metals and water
When discussing valves, the term "full port" means: - answer"Full port" refers to the seat
portion of the valve being virtually the same size as the inlet and outlet openings of the
valve
When are full port valves needed? - answerFull port valves are needed when reduced
flow volume could create operational problems
Explain what could happen to gate valves when they are in a partially open position -
answerGate valves are subject to problems when in a partially open position such as
the gate portion of the valve vibrates and chatters when in a partially open position
If a valve is going to be needed to throttle a flow, what type of valve should be used? -
answerIf a valve is going to be needed to throttle a flow, either a needle valve or a ball
valve are the types that should be used
Where are quick opening gate valves often found in steamers? - answerThe quick
opening gate valves are often found in the steam inlet valves on older pressure steamer
cooking compartments
Describe the operation of a ball valve - answerA ball valve has a metal ball with a hole
bored through it, compressed between to plastic or teflon seats to prevent leakage. The
valve is fully opened or closed by rotating the handle 90 degrees
Seal rings on ball valves are made of: - answerPlastic or Teflon
