The excess-flow shutdown valve is used for pipeline safety isolation, when excess flow occurs.
Description
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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.
For more information or quote on Excess Flow Shutdown Valve- Hydromine, please call or email for a direct reply.
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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.
For more information or quote on Excess Flow Shutdown Valve- Hydromine, please call or email for a direct reply.