Flow Control
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Flow Control

Flow control valve
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2010)
Globe control valve with the pneumatic actuator and smart positioner
A flow control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges.
Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball, gate and butterfly valves are also used.
Control valves can also work with hydraulic actuators (also known as hydraulic pilots). These types of valves are also known as Automatic Control Valves. The hydraulic actuators will respond to changes of pressure or flow and will open/close the valve. Automatic Control Valves do not require an external power source, meaning that the fluid pressure is enough to open and close the valve. Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, altitude valves, and relief valves. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, or man power), it is done automatically, hence its name.
Images
Hastelloy ball valve
Stainless steel gate valve
Stainless steel gate valve
Hastelloy check valves
Duplex ball valve
Inconel gate valve
Stainless steel wafer check valve
Inconel check valve
Stainless steel ball valve
Cast iron butterfly valve
Flanged nozzle inconel check valve or axial check valve
Large carbon steel swing check valve
Cast iron butterfly valve
See also
Valve
Ball valve
Butterfly valve
Control valve
Globe valve
Needle valve
References
Categories: ValvesHidden categories: Articles lacking sources from January 2010 | All articles lacking sources
About the Author
I am China Crafts Suppliers writer, reports some information about horizontal centrifugal pump , diesel irrigation pump.
hi ladies .. can you control your blood movement i.e. stop and start your blood flow during periods ?
just as we boys and you girls also can stop flow of urine for some time if washrooms are not available and later release it when we desire? does blood flow get controlled at your wish or it involuntarily flows out ? also how do you know that flow has started and you are now in your periods? means do u feel wet or itchy or what? and does this flow has smell so can we boys judge whether a girl is in periods? and doesnt it get messy with all hair down there?
once periods start u can't stop
CFD Unsteady Simulation - Active flow control - Boundary layer control via suction




































































































