check valve opening and closing ( The disc) Dielectric force, automatic stop medium flow Industrial Valves, said so far valves. Generally speaking, the check valve is open and medium medium downstream upstream closed automatic industrial valves. Control medium flow of this approach is used to prevent the backflow medium, in order to maintain the initial state, the pump after stop make reciprocating pumps and compressors can run, and prevent the driven standby reverse rotary compressor and pump device. Check valve can also be used to give the pressure could rise to more than the main system of auxiliary system supply piping.

( 1) The purpose of the check valve pipe, anyone who does not allow medium counter-current occasions need to install the check valve. Check valves parameters is as follows: nominal size DN10 ~ 1800; Nominal pressure PN6 ~ 420; Working temperature t≤ 550℃。

( 2) The kinds of check valve check valve is a lot of more phyletic, comprehensive classification is as follows:

( 3) The structure of the check valve (1) - lift check valve as shown in figure 2 48, as shown in the disc along the center line of seat make lifting movement, its body globe valve body with exactly the same, can be universal. At the bottom of the valve guide tube and cover the upper guide sleeve a pressure relief hole. When the disc rise, through the medium inside the sleeve, pressure relief hole to reduce the resistance of disc opens. The industrial valves fluid resistance is bigger, can only be installed in horizontal pipe runs. Such as auxiliary spring set in the middle of the disc, the disc under the action of spring force closed, can be installed in any position, as shown in FIG. 2 49.

lift bottom Industrial Valves, as shown in figure 2 50 shows, this is a kind of special check valve. It is mainly installed in not self-priming or not the end of the vacuum pump suction diversion of water pump suction pipe. Bottom valve must be submerged, its role is to prevent in advance before entering the water in the suction pipe or launch into the pump and the water in the suction pipe flow back, ensure the pump normal boot.

lift bottom valve is mainly composed of valve body, disc and filter, etc. The function of a filter is to prevent impurities in water into the suction pipe, in order to avoid damage to pumps and related equipment.

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