difference between high lift and improved high lift safety valve
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Safety valves are fitted in pairs, usually on a single valve chest. Each valve must be able to release all the steam the boiler can produce without the pressure rising by more than 10% over a set period.
Spring-loaded valves are always fitted on board ship because of their positive action at any inclination. They are positioned on the boiler drum in the steam space.
The ordinary spring loaded safety valve is shown in Figure below. The valve is held closed by the helical spring whose pressure is set by the compression nut at the top.
Spring-loaded valves are always fitted on board ship because of their positive action at any inclination. They are positioned on the boiler drum in the steam space.
The ordinary spring loaded safety valve is shown in Figure below. The valve is held closed by the helical spring whose pressure is set by the compression nut at the top.
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Improved high lift safety valve:
The improved high lift safety valve makes use of waste steam pressure to increase the valve lift; this is done by permitting the pressure to act upon the lower spring carrier which fits within a floating ring so establishing in effect a piston.
High lift safety valve:
High lift safety valve have waste steam piston and it has no floating ring.
Hope it helped.....
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