Difference between revisions of "Non-Return Valves"

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Non-Return Valves (view source)

Revision as of 23:17, 15 January 2013

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[[Category:Valves]]{{Knoppen}}
[[Category:Valves]]{{Knoppen}}
[[File:Non return valves.jpg|thumb|right|Non-Return Valves]]
[[File:Non return valve graph.jpg|thumb|right|Graph of non-return valve]]
'''Non-Return Valves''',[[Check Valves]], clack valve, or one-way valves are mechanical devices, [[Valves]], which normally allows fluid  to flow through it in only one direction.


Pneumatic non-return valves are used where a normal non-return valve would be ineffective. This is for example where there is a risk of flood water entering a site but an equal risk of pollution or a chemical spills leaving a site and polluting the environment.
Non-return valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of non-return valves used in a wide variety of applications. Non-return valves are often part of common household items. Although they are available in a wide range of sizes and costs, non-return valves generally are very small, simple, and/or inexpensive. Non-return valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies of most non-return valvesare made of plastic or metal.
Pneumatic non-return valves are installed below ground and can be used to pneumatically lock the non-return valve closed thus containing a site in the event of a spill.
It is common practice to lock sites using pneumatic non-return valves during the loading or transferring of chemicals or hazardous waste. Pneumatic non-return valves have a longer service life when compared to pneumatic bladder systems.


An important concept in non-return valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the non-return valve is designed for and can therefore be specified for a specific cracking pressure.
Heart valves are essentially inlet and outlet non-return valve for the heart ventricles, since the ventricles act as pumps.Non-return valves protect plants, pipelines and outlet points against reverse gasflow and meet all relevant standards and regulations. The product range of non-return valves includes a large choice of nominal sizes and flow rates .


non return valve can be stated as one way root.no return back to pump. In this case the fluid coming from delivery of pump press the plate inside the non return valve along with screw. When the fluid generates back pressure the screw comes down and the return way is blocked by the plate that is how "screw down non-return valve works.
 
The sophisticated valve technology of non-return valves provides small pressure drops making them also suitable for applications with smallest opening pressures. A high-quality sealing system with elastomeres prevents leakages and dirt filters at the inlet point assure long service life of the non-return valves.Some non-return valve models can also be used as flashback arrestors. All non-return valves can be mounted in any orientation, are available with all connections, in brass and stainless steel and are suitable for almost all technical gases.
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