REXROTH Rexroth proportional directional valve 4WRA10EA00-22/G24K4V-873 is guided by the center shafts at both ends of the inlet and outlet, with flexible opening and closing, and can be installed horizontally or vertically. The valve flap adopts spring loading, and its fast closing can effectively reduce water hammer pressure, with good sealing performance and no noise closing. Check valve has the advantages of small size, light weight, low fluid resistance, fatigue resistance, long life, etc., the role produced is to allow the medium to flow in one direction only, and to prevent the direction of flow.Rexroth pilot-operated proportional directional valves and external accessories composition. Among them, the main valve includes valve body, pressure plate and diaphragm, large valve plate, slow closing valve plate, valve seat, stem assembly and other components. The slow closing valve plate is connected to the pressure plate and diaphragm with the 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 up and down. The valve stem passes through the center hole of the large valve plate, so the large valve plate can slide along the valve stem within a certain range. Normally, the big valve plate is pressed on the valve seat by its own weight, so that the valve is in the closed state. Multifunctional pump control valve external accessories installed on both sides of the valve diaphragm and the valve inlet and outlet pipe, the lower chamber of the diaphragm and the valve inlet side of the connecting pipe equipped with a control valve. Filter and a special check valve. The upper chamber of the diaphragm and the valve's outlet side of the connection pipe is equipped with only a filter and a control valve. The movement and position of the large valve plate and the slow closing valve plate in the main valve determine the change of the valve's working condition and opening and closing. By keeping the pressure difference between the front and back of the orifice plate (fixed orifice), the flow rate is limited, so it can also be called a fixed-flow valve. Fixed-flow valve is the object of action is the flow, can lock the amount of water flowing through the valve, rather than for the balance of resistance. He was able to solve the system's dynamic dysfunction: in order to maintain a single refrigeration machine, boilers, cooling towers, heat exchangers, the rate of these devices, it is necessary to control the flow of these devices to be fixed at the rated value; from the end of the system, in order to avoid dynamic regulation of the interaction, but also need to limit the flow of the device or branch at the end.