Normally closed nc valves usually have the valve closed in unpressurized conditions and use a spring to return the valve to the rest state.
Angle seat valve working.
Angle seat valves are operated pneumatically such that air pressure is used to control the piston actuator which lifts the valve plug off its seat.
Angle seat piston valves are particularly suited to applications where high temperatures and large flow rates are required such as steam or water.
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The seat is set at an angle to provide the maximum possible flow when unseated.
Benefits compact design high flow rates visual position indicator.