Cylinder Cocks are used in connection with the cylinder to allow the water accumulated by the condensing of steam in the cylinder to escape, and should be opened every time the engine is started or stopped. This should never be neglected, as great damage may be caused by the breaking of the follower plate or cylinder head. They should also be left open when engine is shut down, and at night in cold weather to prevent freezing and the consequent damage.
Lunkenheimer Cylinder Cock.
CHECK VALVE.
A Check Valve is the valve on the feed pipe between pump or injector and the boiler. The check valve is so constructed that the pressure of the feed water from the pump or injector lifts the valve from its seat and the water passes into the boiler. Immediately after the pressure from the pump or injector is released, the pressure from the boiler closes this valve and prevents the water from being forced back into the pump or injector. There are two check valves used in connection with a pump, one on suction, the other on deliver pipe.
Q. How can check valves that get stuck open be closed?
A. By simply tapping them slightly with a light hammer.
Q. Should this be practiced?
A. No, when they stick at all they should be opened and thoroughly cleaned as soon as pressure can be shut off.