The multifunctional water pump control valve is a power transmission device that integrates the functions of a gate valve, check valve, and water hammer eliminator. It consists of a main valve, regulating valve, and piping system, and adopts a direct-flow valve body and a dual control chamber structure. It can realize multifunctional control of the water pump outlet, such as slow opening, full opening, slow closing, and shut-off. It is mainly used in the water pump outlet pipeline of high-rise buildings and other water supply systems to prevent and reduce water hammer, prevent water backflow to protect the water pump, and maintain pipeline safety.
Working Principle
(1) When the pump is stopped, the valve plate is completely closed under the static pressure at the outlet end and the upper chamber of the diaphragm.
(2) When the pump starts, water pressure is introduced into the lower chamber through the bypass pipe. The main valve plate and the slow-closing valve plate slowly open under the water pressure at the inlet end and the lower chamber.
(3) Under the pressure at the inlet end, the valve plate rises to its maximum opening state. The opening height is determined by the flow rate.
(4) At the moment the pump stops, the flow rate and pressure suddenly decrease, and the main valve plate begins to slide downwards under gravity.
(5) When the flow rate approaches zero, the main valve is closed. A vent hole is left on the main valve plate to reduce the water hammer impact force. A pressure difference is formed between the upper and lower parts of the main valve plate. The water pressure at the valve outlet enters the upper chamber through the bypass pipe, pushing the diaphragm pressure plate and causing water in the lower chamber to drain into the valve inlet. The slow-closing valve plate begins to slowly close.
(6) The slow-closing valve plate completely closes the vent hole, and the valve returns to the initial state after the pump stops.
Basic Structure:
The overall dimensions of the valve are comparable to a standard check valve, consisting of a main valve and external accessories. The main valve includes the valve body, pressure plate and diaphragm, large valve plate, slow-closing valve plate, valve seat, and valve stem assembly. The slow-closing valve plate is connected to the pressure plate and diaphragm via the valve stem assembly. The diaphragm is pressed between the valve cover and the diaphragm seat, and the up-and-down movement of the diaphragm drives the slow-closing valve plate to move up and down. The valve stem passes through the center hole of the large valve plate, allowing the large valve plate to slide along the valve stem within a certain range. Normally, the large valve plate is pressed against the valve seat by its own weight, keeping the valve closed. The external accessories of the multi-functional water pump control valve are installed on both sides of the valve diaphragm and on the valve's inlet and outlet pipes. The lower chamber of the diaphragm, connected to the inlet side of the valve, houses a control valve, a filter, and a specially designed check valve.
The upper chamber of the diaphragm, connected to the outlet side of the valve, houses only a filter and a control valve. The movement and position of the large valve plate and the slow-closing valve plate within the main valve determine the changes in the valve's operating state and its opening and closing. External accessories and piping constantly transmit pressure changes before and after the valve to the upper and lower chambers within the valve, divided by the diaphragm, controlling the movement of the large valve plate and the slow-closing valve plate. The operating speed of the large valve plate and the slow-closing valve plate can be changed by adjusting the accessories, ensuring the valve's opening and slow-closing times are within a specified range.
Working Pressure:
This type of multi-functional control pump valve is available in six working pressures: 1.0MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.4MPa, and 10.0MPa. The operating pressure is greater than or equal to 0.03MPa. The medium temperature range is 0–80℃. The slow-closing time is adjustable from 3 to 120 seconds. The pressure loss at a pipeline flow velocity of 2 m/s is less than 0.01MPa, and the water hammer peak is less than 1.5 times the working pressure. Nominal diameters range from DN50 to DN1400.
Multifunctional Water Pump Control Valve Factory
