UNDERGROUND SAFETY VALVES


 

UNDERGROUND SAFETY VALVES FOR WATER TANK / WATER FLOW CANAL

AS PER BS 4558: 1983

A Valve provided in a canal lining which opens in the canal to relieve excess hydrostatic pressure behind the lining. The Pressure relief valves shall be such that it will operate by a differential pressure less than that which will be damaging to the lining with safety factor of 2. this should be operative generally with a differential head of 100 mm and above. Pressure relief valves are generally of such material which will be abrasive resistant and will not be effected due to its presence in the water.

Pipes are provided with filter all round so that sub-soil water can flow in the pipe without changing the soil strata beneath the lining. Pipes are generally of cement concrete/end may be perforated. Joints in the pipe are kept open so as to facilitate the entry of water. 

SAFETY / PRESSURE RELIEF VALVES  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    NON – RETURN VALVES  BALL VALVES DIAPHRAGM VALVES  NEEDLE  VALVES / MANIFOLDS/ THROTTLING VALVES   FLUSH BOTTOM VALVES