Gate Valve

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Gate Valves

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.

Technical Information

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
80 200 140 160 160
100 250 105 160 160
150 250 50 160 160
200 300 40 73 140
250 400 40 50 93
300 400 30 35 65
350 533 12 17
400 610 10 13
450 686 8 10
500 686 7 8
600 762 3 3

1. Max input effort is 50kg ( 25kg Push/Pull )

gate valve drawing

 

 

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.

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