Normally open no valves have the.
Angle seat valve working.
Parker angle seat valves introduction an angle seat valve is actuated by a pneumatically driven piston and is capable to handle slurry solutions with particles or corrosive solutions at high temperature up to 180 c and operating pressure up to 16 bar.
Angle seat piston valves are particularly suited to applications where high temperatures and large flow rates are required such as steam or water.
The seat is set at an angle to provide the maximum possible flow when unseated.
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.
Normally closed nc valves usually have the valve closed in unpressurized conditions and use a spring to return the valve to the rest state.