Is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body. The following are some of the typical applications of globe valves: Cooling water systems. Fuel oil systems where flow is regulated and leak tightness is very crucial.
Feed water or chemical feed systems.
Boiler and main steam vents and drains.
Turbine lubes oil system and others. They are also use for Isolation and throttling services. Although these valves exhibit slightly higher pressure drops than straight through valves (e.g., gate, plug, ball, etc.), they may be used where the pressure drop through the valve is not a controlling factor.
Diaphragm valves are excellent for controlling the flow of fluids containing suspended solids and offer the flexibility of being installed in any position. Weir-type diaphragm valves are better at throttling than straight diaphragm valves because the design’s large shutoff area along the seat gives it the characteristics of a quick-opening valve. The diaphragm acts as the gasket of the valve to seal against leaks between the body and bonnet cap.
Since diaphragm valves have minimal contact surfaces and are considered the cleanest valve (least likely to cause contamination) they have found widespread use in the pharmaceutical, food processing, and water treatment industries. Diaphragm valves are also used in the electronics industry, pulp and paper industry, power industry, and in high-purity water systems.
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