Check valve manufacturers believe that ordinary check valves close quickly and are prone to water hammer, resulting in a sudden increase in pressure, damage to pipes and equipment, and loud noise. The miniature slow closing check valve solves the problems caused by the rapid closing of ordinary check valves. Used in the direct water supply and drainage systems of industrial and mining enterprises and high-rise buildings, it can reduce the occurrence of water hammer and water hammer and achieve the effect of safe shutdown.
1. Structural features of the micro-resistance slow-closing check valve:
One valve is installed in front of the valve, and one valve is installed behind the valve, which is convenient for maintenance. Install a filter in front of the valve to prevent impurities in the piping system from entering the check valve. Check valve manufacturers believe that the slow-closing check valve should be installed horizontally. If the valve is installed in the well, there should be some maintenance space. An automatic exhaust valve should be installed on the pipeline according to the relevant specifications to ensure the continuous flow of the water column.
2. The working principle of the micro-resistance slow-closing check valve:
When the water pump is started: the check valve manufacturer believes that the pressure at the valve inlet causes the valve disc to quickly open against the spring force, and the medium at the main valve inlet enters the upper chamber of the diaphragm through the needle valve and the check valve. Adjust the opening of the needle valve, so that the medium entering the upper chamber of the diaphragm acts on the diaphragm pressure plate, and a reaction force is generated on the valve disc to ensure that the valve disc is slowly opened. Adjust the opening of the needle valve at the inlet of the main valve, control the opening speed of the valve, and ensure that the opening time of the main valve is longer than the starting time of the pump motor, so that the pump can start under light load and prevent the motor starting current from being too large.
When the water pump is turned off: the check valve manufacturer believes that the pressure at the valve inlet suddenly decreases, and the valve flap will suddenly close under the pressure at the outlet, resulting in a sudden increase in the pressure at the valve outlet. At this time, water hammer is easy to occur, causing damage to the pipeline and equipment behind the valve, and producing a lot of noise.utdown.
The manufacturer of the check valve believes that because the return system is installed at the outlet end of the valve, the medium after the valve enters the upper chamber of the diaphragm through the ball valve. Due to the check function of the check valve, the medium cannot enter the inlet end, and the lower chamber of the diaphragm is also filled with medium. Although the pressure of the medium in the upper chamber promotes the closing of the valve flap, the medium in the lower chamber cannot be quickly discharged under the throttling action of the small hole of the diaphragm seat, resulting in a buffering process, which prevents the closing speed of the valve flap and achieves a slow closing. The mute effect prevents the water hammer phenomenon. By adjusting the opening of the ball valve, the closing speed of the valve disc (ie the closing time of the valve) can be effectively controlled.
The manufacturer of the check valve believes that the micro slow-closing check valve has the technical characteristics of slow opening and slow closing and eliminating water hammer, which realizes the light-load start of the pump and prevents the occurrence of water hammer when the pump is stopped. After the pump motor is started, the valve will automatically open and close according to the pump's operating program. Check valve refers to a valve that automatically opens and closes the valve flap by the flow of the medium itself to prevent the backflow of the medium.
Check valve manufacturers believe that the check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the reverse rotation of the pump and the drive motor, and release the medium in the container. Check valves can also be used in piping supplying auxiliary systems where pressure may rise above system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Post time: Aug-24-2022