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Control Valves

Bellows Seal Valve Working Principle

S Bharadwaj Reddy
A completely different approach to packing is a device called a bellows seal : an accordion-like metal tube fastened to the valve stem and to the bonnet, forming a leak-proof

What is Valve Packing ?

S Bharadwaj Reddy
Regardless of valve type, all stem-actuated control valves require some form of seal allowing motion of the stem from some external device (an actuator ) while sealing process fluid so

Valve Actuator Bench Set

S Bharadwaj Reddy
Valve actuators provide force to move control valve trim. For precise positioning of a control valve, there must be a calibrated relationship between applied force and valve position. Most pneumatic

Disk Valves

S Bharadwaj Reddy
Disk valves (often referred to as eccentric disk valves, or as high-performance butterfly valves) are a variation on the butterfly design intended to improve seat shut-off. The disk’s center is

Electrical Actuators

S Bharadwaj Reddy
Electric motors have long been used to actuate large valves, especially valves operated as on/off (“shutoff”) devices. Advances in motor design and motor control circuitry have brought motor operated valve

Rotary Stem Valves

S Bharadwaj Reddy
A different strategy for controlling the flow of fluid is to insert a rotary element into the flow path. Instead of sliding a stem into and out of the valve

Pneumatic Actuators

S Bharadwaj Reddy
Pneumatic actuators use air pressure pushing against either a flexible diaphragm or a piston to move a valve mechanism. The following photograph shows a cut-away control valve, with a pneumatic

Hydraulic Actuators

S Bharadwaj Reddy
Hydraulic actuators use liquid pressure rather than gas pressure to move the valve mechanism. Nearly all hydraulic actuator designs use a piston rather than a diaphragm to convert fluid pressure

Self Operated Valves

S Bharadwaj Reddy
Although not a type of actuator itself, a form of actuation worthy of mention is where the process fluid pressure itself actuates a valve mechanism. This self-operating principle may be

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