The pneumatic control valve is used for   general purpose control and safety applications such as:-

• Remote start/stop of flow.
• Pressure relief.
• Flow control.
• Pressure control.
• Level control.
• Excess-flow shutdown.

PRINCIPLES OF OPERATION

The control system consists on: –

• A flow, level, S.G or pressure transmitter with an analogue output of 4-20 mA.
• An analogue switch receiving the signal from the transmitter, to close or open a set of N/C or N/O contacts.
• A 4/3 directional solenoid valve, activated by the analogue switch to determine the N.G.D valve’s control position.

INTEGRATED ACTUATOR

The N.G.D pneumatic valve’s actuator is a natural and integrated part of the valve. This type of actuator is ideal for plants or pump stations, where compressedair source can energise many valves.

ADVANTAGES

• Off-the-shelf standard variety of pneumatic valves, fittings and pneumatic components to enable any control or safety applications.
• Cost effective and reliable actuating and control system
• Low pressure actuating and control system.

DISADVANTAGES

• Compressed air can be contaminated or subjected to condensation.
• Low actuating forces due to limited compressed air pressure.