Fisher™ Type P539A Pneumatic Actuator
Type P539A pneumatic actuator permits opening and closing Fisher N550/N551 Series Snappy Joe emergency shutoff valves (ESVs) both at the valve with the use of a pneumatic 4-way valve and from a remote location. The actuator opens the valve when pressure is applied. Upon loss of pressure, the N550/N551 Series closes, assisted by the spring in the pneumatic actuator.
FeaturesRemotely Operate Emergency Shutoff Valves on Stationary Storage Tanks at Bulk PlantsFusible Element Provides Thermal ReleaseReturn Mechanism: Spring only?no air requiredSpecificationsEmergency Shutoff Valve End Connection Size and Style1-1/4, 2 and 3-inch NPTActuator Pressure LimitsMinimum: 20 psig / 1,4 bar
Maximum: 40 psig / 2,8 bar
Recommended Operating Pressure: 20 to 25 psig / 1,4 to 1,7 barTemperature Capabilities-40° to 150°F / -40° to 66°CApproximate Weight4.8 Pounds / 2 kgThermal Release Melt Point212°F / 100°C
