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Control Valves

Spring and Diaphragm Pneumatic Actuators

S Bharadwaj Reddy
Spring and diaphragm pneumatic actuators can be “direct-acting”, meaning that air to the diaphragm casing pushes the actuator stem downward. This “air-to-close” action compresses the spring, which in turn pushes

How Quick Opening, Linear & Equal Percentage Valve Characteristics Derived

S Bharadwaj Reddy
In essence a valve simply functions as a restriction in a flow line, with flow areas A1 and A2 and pressure differential p1 – p2, as shown in Below Figure. The below

Control Valves Leakage Classifications

S Bharadwaj Reddy
Classification of seat leakage through control valves Control valves are designed to throttle and not necessary to close 100%. A control valve’s ability to shut off has to do with

Control Valve Cavitation and Flashing

S Bharadwaj Reddy
Cavitation and Flashing Flashing Flashing is the first stage of cavitation. However, it is possible for flashing to occur by itself without cavitation occurring. Flashing occurs in liquid flows when

Summary of Valve Types Characteristics

S Bharadwaj Reddy
Globe Valves: Suitable for regulating flow Tight shut-off Pressure drop when open Used for high pressure clean fluids Ball Valves: Not suitable for regulating flow except in some specialized ball

Basics of Gate Valves

S Bharadwaj Reddy
The Gate valve is a linear actuating  valve used as flow isolater in a fluid pipeline.  As the name says the gate valve, a flat  circular or rectangular plate acts as

Basics of Globe Valves

S Bharadwaj Reddy
Globe valves consist of a movable disk-type element and a stationary ring seat in a generally spherical body. The valve stem moves a globe plug relative to the valve seat.

Basics of Butterfly Valves

S Bharadwaj Reddy
A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of

Basics of Ball Valves

S Bharadwaj Reddy
A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball (called a “floating ball”) to control flow through it. It is open when the ball’s hole is

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