Check them belonging to this type of valve, which includes a swing check valve and lift check valves. Swing check valves are ordinary hinge, there is a door the same as the valve freely against the tilt on the seat surface. In order to ensure the valve seat face every time to reach the appropriate location, the design of the valve in the hinge, so that the valve flap has enough swing space, and a real flap valve, full contact with the valve seat. The valve can be all made ??of metal embedded in the metal, leather, rubber, or synthetic cover, depending on the use of performance requirements. Swing check valve in the fully open position, fluid pressure is almost unimpeded through the valve pressure drop is relatively small. Lift check valve is located on the valve body seat sealing surface. In addition to the valve can be free to lift, and the rest is the same as the cut-off valve, this valve and fluid pressure valve is lifted from the seat sealing surface, medium return valve flap led to a seat on, and cut off the flow. Under the conditions of use, the valve can be all metal construction, it can be rack mounted in the valve rubber mat or rubber ring in the form. The same as the cut-off valve, the fluid through the channel of the lift check valve is narrow, so the lift check valve pressure drop than the swing check valve, Swing check valve flow restrictions on very little.
Check valve common faults and approach

Common failures are:
① disc break; ② media back.
Of the disc break because:
Media pressure before and after the check valve in the close to balance each other and “see-saw” state, the valve is often associated with the seat beat, some brittle materials (such as cast iron, brass, etc.) made ??of the valve was broken.
The preventive approach is a non-return valve of the valve for ductile materials.

Media reflux causes:
① sealing surface damage; (2) into the folder impurities. Repair the sealing surface and the cleaning of impurities, will be able to prevent backflow.

Reproduced in: http://www.bf35.com/news/detail/14887.html

]]> http://www.talkingfavourites.com/archives/1023/feed 0 http://www.talkingfavourites.com/archives/1022 http://www.talkingfavourites.com/archives/1022#comments Fri, 27 Apr 2012 01:09:01 +0000 admin Ene mand blev dr?bt og en anden s?ret under]]> Ene mand blev dr?bt og en anden s?ret under en tidlig mandag r?veri
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]]> http://www.talkingfavourites.com/archives/1021/feed 0 http://www.talkingfavourites.com/archives/1020 http://www.talkingfavourites.com/archives/1020#comments Fri, 27 Apr 2012 01:08:52 +0000 admin LeBron James et Shaquille O eal - NBA 09-10]]> LeBron James et Shaquille O eal – NBA 09-10 Journée des médias
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]]> http://www.talkingfavourites.com/archives/1020/feed 0 http://www.talkingfavourites.com/archives/1019 http://www.talkingfavourites.com/archives/1019#comments Fri, 27 Apr 2012 01:08:45 +0000 admin Nike Air Burst Green / White br /> Air Max ]]> Nike Air Burst Green / White br /> Air Max Logo nike shox
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