SAFETY VALVES


SAFETY VALVE

Safety valve is provided to protect the boiler shell from over pressure and subsequent explosion.

Types of safety valve:

- Spring-loaded safety valve (Mostly used now days)

- Dead weight safety valve (includes lever type also-used for more flow and very low pressures)

Safety valves, which are fitted to steam boiler, are met with the following criteria:

Installation and maintenance

Discharge pipework from the safety valve must not be obstructed and to be drained at the base to prevent the accumulation of condensate. It is ensured that the discharge pipework is kept as short as possible with the minimum number of bends to minimize any backpressure. There should be no shut off valves between the boiler and the Safety valve.

Safety valves should be regularly tested by the boiler operator on duty. Testing a safety valve is performed by simply lifting the test lever on the side of the valve. This test is done while the boiler is operating at between 75% and 100% of its operating pressure. Prior to the test, determine that the valve discharge is piped to a safe place.

  THERMAL RELIEF VALVE    ATMOSPHERIC RELIEF VALVE   PRESSURE REDUCING VALVES / STATION   PRESSURE CUM VACUUM RELIEF VALVES  BREATHER VALVES   EXCESS FLOW CHECK VALVES   EXCESS FLOW  SHUT  OFF VALVES   UNDERGROUND SAFETY VALVES FOR WATER TANK /  WATER FLOW CANAL AS PER BS – 4558 : 1983 NON – RETURN VALVES  BALL VALVES DIAPHRAGM VALVES  NEEDLE  VALVES / MANIFOLDS/ THROTTLING VALVES   FLUSH BOTTOM VALVES