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).

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.

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.

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.

The SSV is the device that blocks or allows the flow thru the production line. It is therefore an essential part of the Surface Safety System. It´s components are a Model “S” gate valve plus an actuator. The combination of the Model “S” gate valve with an inverted port gate (the opening port is in the upper section of the gate) and our actuator, results in the SSV to be normally closed.

The model S valve can be supplied with pneumatic or hydraulic actuators.

The pneumatic or hydraulic operated valves, meet a wide range of applications in oil and gas services up to 10,000 PSI, they can be supplied with pilots, filters and all the necessary elements that compose and integrated surface safety system.

In case of hydraulic operated valves, they can be supplied as self-contained packages. These units do not require external power source.

Actuator´s main features are to have Internal sleeve protected with Non Electrolytic Nickel Coating, non-elastomeric stem packing, Metal to Metal backseat between stem & bonnet, adjustable built-in stroke limit and to be easy inspection and repairing.

The pneumatic actuators are simple effect piston actuators designed to operate any gate valve. These actuators can be powered by wellhead gas, treated gas, air or nitrogen.

1- VALVE WITH PNEUMATIC ACTUATOR MODEL N12

2- VALVE WITH PNEUMATIC ACTUATOR & MANUAL OVERRIDE

3- VALVE WITH PNEUMATIC ACTUATOR FOR LOW PRESSURE MODEL NL17

Hydraulic Actuators

1- VALVE WITH HYDRAULIC ACTUATOR - MODEL H5

2- VALVE WITH HYDRAULIC ACTUATOR - MODEL N6

DHSV

The Tubing Retrievable Safety Valve, always positioned subsea, is a component of the production tubing, and a safe way to prevent blows or uncontrolled well flows, in the event of a failure in the surface safety equipment, preserving the environment and people's lives.

The valve is normally closed, controlled from the surface. For allowing production the DHSV has to stand in the open position. It also allows the installation of a Wireline Retrievable Safety Valve. Both can be self-equalizing or non-equalizing.