Valves used in Pipelines - VALVE OPERATORS PDF Print E-mail
Written by Norrie   
Sunday, 02 May 2010 18:18
Article Index
Valves used in Pipelines
TYPES OF VALVES - GATE VALVE
TYPES OF VALVES - THE GLOBE VALVE
TYPES OF VALVES - NEEDLE, ANGLE, PLUG, BALL, BUTTERFLY, CHECK VALVE
SAFETY RELIEF VALVES
VALVE ACCESSORIES
VALVE OPERATORS
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2. VALVE OPERATORS (See Figure: 23)

The most common valve operator is the 'Hand-wheel'. Other methods of valve operation can be as follows :

A. A Diaphragm
Here, the valve is operated by an air powered diaphragm. These are called 'Pneumatic Control Valves'. The air powered actuator can also take the form of a 'Piston' rather than a diaphragm. The operation of the valve, depending on requirements, may be 'Air to Open' (AO) or 'Air to Close' (AC).

B. An Electric Motor
This is called a 'Motor Operated Valve' (MOV) and may be installed to allow valve operation from a remote location and may then be referred to as a 'Remote Operated Valve' (ROV).

C. A Solenoid
This method of valve operation is used for a small valve placed in an air supply line to a shut-down device. The solenoid will be activated on an electrical signal from an automatic trip system and will open or close depending upon its function.


Figure: 23 -Diaphragm Operated Valve