Gate Valves function is to isolate or sectionalise any piece of equipment or length of pipeline in water or sewage systems.
It is normal practice, therefore, to use them on a suction and delivery branches of pumps at regular intervals along a pipeline, at branches underneath air valves, on bye-passes, on drains or washouts etc.
They have a low head loss coefficient, hence are ideal on pump installations to maximise system efficiency.
Maximum Unbalanced Head for Manual Operation of inside screw gate valves
|Valve Bore mm||Handwheel Dia mm||Unbalanced Head in Metres|
|Handwheel Operation||Tee Key Operation|
1. Max input effort is 50kg ( 25kg Push/Pull )
2. Tee Key has 0.7m arm (0.6m effective length )
3. For greater unbalanced head it is necessary to use a bypass or fit totally enclosed units having integral ball bearing collar.