Valve: Functions And Types

VALVE

FUNCTIONS AND TYPES DASEP SUPRIATNA NIP : 432186051518008

VALVE Many different types of valves are used in industrial plants to perform various functions. Valve are used for on -off service, modulating/throttling service, to protect components against overpressure, and to prevent backflow from occurring.

Types of Valve In general, valves may be categorized within the following four groups :  Isolation Valves  Control Valves  Pressure Relief Valves  Check Valve

Types of Valve Isolating Valves

Control Valves

Used for on-off service (including throttled position) with local or remote actuation. Depending on the particular application and operating conditions.

 Used for modulating or

throttling service. Their operation is automatic in response to continuous monitoring of some parameter in the controlled system  In general, control valves require no manual operator action.  A control valve function as a variable resistance in a pipeline.

Types of Valve Pressure Relief Valves

Check Valves

 Used to provide protection

 Used to allow flow in the

against excessive pressure.  The valve opes automatically when pressure exceeds a preset level and closes after pressure recedes below a preset level.  Power-operated relief valves that open or close in response to command signals are also utilized.

normal flow direction and prevent flown in the opposite flow direction (reverse flow)  Check valves are typecally opened and closed by the flow forces.