The main function of the CNM Pneumatic Controller is to shut down the Pneumatic Surface Safety Valve. In case that the sensed pressure goes above or below the pre established limits, the CNM Pneumatic Controller automatically vents the actuator and shuts down the gate valve. It also allows local/manual shut down by tripping the pneumatic relay (pos N ° 4).
The CNM pneumatic controller is a compact unit that can sense line pressure from 10 PSI (0.7 bar) to 11480 PSI (791 bar). It can operate at working temperatures of -30°C (-22°F) to 80°C (176°C).
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PNEUMATIC CIRCUIT
No esquema pneumático pode-se observar a lógica de funcionamento seguindo o sentido das setas.
ADVANTAGES
- Works with the Wellhead gas.
- Can be operated with automatic or manual reset.
- Easy field calibration.
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PNEUMATIC RELAY
The pneumatic relay (Relay NM) controls the gas supply to the valve actuator.
The NM relay can work either in a manual reset or automatic reset mode. Thru a very simple operation which consist of inverting a piston and changing a seal.
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PNEUMATIC PILOTS
The Pneumatic Pilots (Pilots NM) control the line pressure and close the safety valve through the Pneumatic Relay.
Technical Characteristics:
- Maximum supply pressure: 250 PSI (17.3 bar)..
- Working Temperature: -30°C (-22°F) to 80°C (176°F).
- Control Pressure range: 50 PSI (3.4 bar) to 11480 PSI (791 bar).
- Control Pressure connection: 1/2” NPT Male.
- Supply Pressure connection: 1/4” NPT Female.
