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Excess Flow Shutfown - Hydrocore

Supplier: Dual Valves Australasia

The excess-flow shutdown valve is used for pipeline safety isolation, when excess flow occurs.

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Principle of Operation
The excess-flow shutdown valve closes when a preset differential pressure 'dP=Pu-Pd' exists across the valve. The valve is powered by the line-fluid pressure with no need for external actuators, pilots, instruments or an external power source.

Shutdown Setting Adjustment
The flow-rate at which the excess-flow shutdown valve closes, can be adjusted by varying the control orifice size 'Do', thus changing the valve's differential pressure dP = Pu - Pd

Water-Hammer Prevention
The excess-flow shutdown valve closes at a controlled speed, which is adjustable by a measuring orifice, while the valve’s flow rate reduces gradually as the valve closes by the control orifice contour.

Resetting - Excessive Demand
The excess-flow shutdown valve closes when the flow through the valve reaches a preset flow rate. The valve will reopen when the: -

  • Over demand conditions are over.
  • Column's downstream is charged through the valve's bypass
  • The valve opens automatically when the downstream pressure is restored

Resetting - Pipe Burst
The excess-flow shutdown valve closes when the flow through the valve reaches a preset flow rate. The valve will reopen when the following procedure takes place: -

  • Pipe burst, causing the excess-flow conditions is rectified
  • Column's downstream is charged by the valve's bypass
  • The valve opens automatically when the downstream pressure is restored.

Remote Isolation
The excess-flow shutdown valve can be remotely operated by a 3/2 solenoid valve, venting or charging the opening compartment.

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