300 x slow close check valve is to be able to control opening and closing speed of check valve, the water pump to start or stop running, can adjust to cooperate with the best opening or closing speed.Can be used in the high-rise building, reduce the water hammer phenomenon, in order to achieve safe and quiet open-close effect.

Working principle:
    When the valve from the inlet water supply, water through micro filter, needle valve, check valve into the main valve control room, then through the ball valve and drainage to the downstream.Because the needle valve opening is less than the ball valve opening, the main valve control room is greater than the water drainage speed, so the control room pressure is reduced, on the main valve inlet pressure of the bottom of open the main valve to supply water to the water downstream.

    When pipe to stop water supply, if the downstream water flowing back, part of the return water enters the main control room, the ball valve with one-way valve, the reflux water cannot flow from the main control room, cause the main control room pressure rise gradually, slowly closing the main valve.

Structure features:
    Slow close check valve 300 x from the main valve, check valve, needle valve, ball valve, micro shape filter and pressure gauge of hydraulic control of system.Using hydraulic automatic operation, can make the main valve to get the best opening or closing speed.Prevent the formation of zhong water water hammer, in order to achieve slowly-closing silencing effect.

    Slow close check valve with hydraulic control on our own efforts, do not need other devices and energy, maintenance is simple, open and slowly-closing smoothly.

Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve