Through Conduit Gate Valve
The flow characteristic of flat gate valves with a diversion hole is equal to that of pipelines of thesame specification.The characteristic is shown in per centum form. As for valves without a diversion hole its cavity fly span is smaller than that of wedge gate vales and it is a regular cylindrical objectthereforecharacteristics of the valves are similar except that they have a larger pressure loss.Besides,their flux adjustment behavior is better than that of the ones with a deversion hole.
Keyword： Through Conduit Gate Valve
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1.Nominal diameter:1/2"(15mm)-80"(2000mm)
2.With eaual pressure throughout the valve(and the gate in closed positionand initia seal is formed with the raised PTFE ring on the faces of the seats(The seat-inserts clean both sides of the gate each time thevalve is opened or closed)
3.As line pressure is applied to the valve.it acts on the gateforcing it against the PTFE ring on the downstream seatcompressing it until the seat against the steel seat.Thusa double seal is formed….firstaPTFE-to-metal seal;thenmetal-to-metalThe seat is also forced firmly into its recess.The O-ring prevents any downstream flow at this point.
4.Upstream seal is provided when valve cavity pressure is bled offThis is caused by the force of line pressure acting against the upstream seat moving the seat against the gate and providina a tiaht PTFE-to metal seal at this point.At the same time.the O-ring forms a tight seal with the seatrecess.
5.Valve automatically relieves itself of excessive valve cavity pressure.When valve cavity pressure exceeds line pressure….from such causes as thermal expansion..the upstream seat is forced back into its recess and the excess pressure in the valve cavity is bled between the seat and the gate into the line
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