What is the function of a slowly opening and closing check valve in water supply pipes?

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The last edit to this post was made by Thank goodness you're here on 2016-7-7 at 11:21. Introduction to the DY30BX slow-opening fast-closing check valve: http://www.jdfam.com/uploads/allimg/160707/1-160FFT54N23.jpg The DY30BX slow-opening fast-closing check valve consists of components such as a valve seat inside the valve body, a valve stem, as well as an upper valve cover and a lower valve cover that are connected to the valve body. The space between the upper valve cover and the lower valve cover is a diaphragm chamber; a diaphragm is placed within this chamber. The diaphragm is connected to the central shaft, whose other end is connected to the valve, which in turn makes contact with the valve seat. The valve opens slowly to prevent current surges and pressure spikes as stated in the official documentation ； Shut off quickly to prevent water hammer. No water quality requirements; it can be used in sewage, clean water, and raw water systems. Working principle of the slow-opening fast-closing check valve: This valve is installed on the system pipeline or at the pump outlet. During normal operation, the medium at the inlet side pushes the large valve disc upward; simultaneously, the medium flows through the flow controller into the middle chamber, causing the valve to open. When operation stops, the medium at the outlet side enters the upper chamber through the control valve, which in turn causes the driving mechanism to move downward and drives both the large and small valve discs to move downward, thereby closing the valve quickly or slowly to prevent backflow of the medium. Adjustment methods: 1. Open the stop valve. 2. Start the pump and check whether the pressure at the valve inlet is normal. 3. Stop the pump and check if the water hammer effect is excessive or if the pump is running in reverse. 4. If the water hammer effect is too severe, slightly close the stop valve. 5. If the pump is running in reverse, slightly open the stop valve. Features of the DY30AX slow-opening/slow-closing check valve: http://www.jdfam.com/uploads/allimg/160707/1-160FFT622225.jpg The DY30AX slow-opening/fast-closing check valve is a valve controlled by water pressure; it consists of a main valve along with associated components such as ducts, pilot valves, needle valves, ball valves, and a pressure gauge. The DY30AX slow-close quick-close check valve can be transformed into a remote-controlled float valve, pressure reducing valve, slow-close check valve, flow control valve, pressure relief valve, hydroelectric control valve, etc., depending on its intended use, functions, and application environment. Main parameters of the DY30AX slow-opening/slow-closing multi-functional check valve: 1. Suitable for systems involving clean water, raw water (containing sediment), sewage, seawater, oils, etc. 　　2. Working pressure (MPa): PN1.0, 1.6, 2.5, 4.0 　3. Operating temperature: –10°C to 130°C 　4. Diameter: DN200 to DN1000 mm 　5. pH level: Suitable for all except strong acids and strong alkali solutions (pH range of 5–10). 　　6. The main components of the product are made of stainless steel and ductile iron. All sealing rings are made from imported rubber materials, selected according to temperature; different materials are used for different conditions ； Furthermore, the inner and outer chambers of the valve body have been treated with epoxy resin spraying. It is wear-resistant, corrosion-resistant, and does not rust easily; it does not produce pollutants, is non-radioactive, and does not affect or harm the environment nor disrupt ecological balance. The material of the main components of the slowly opening and closing check valve is listed in the table below: Component Name, Material – Valve body and valve cover: cast iron, cast steel, stainless steel; Valve stem: chromium stainless steel; Valve disc: carbon steel, stainless steel + rubber; O-rings: rubber; Springs: stainless steel