Product details I. Outlining metering pumps and other positive displacement pumps operate at low system pressure, there will be an excess of transport. To prevent similar problems, must be at least 0.7Bar import and export metering pump backpressure. By installing a back pressure valve in the metering pump outlet pipe can achieve their goals. Second, the main function 1. Provide back-pressure valve pressure difference at both ends of the line is not very demanding 2. The system can be used as a safety valve to use. 3. and pulsation dampers used in conjunction reduce water hammer damage to the system, reducing the peak flow rate fluctuations, protect pipes, elbows, joints from impact pressure fluctuations. 4. create a good working environment for the metering pumps and pump performance improvements. Third, the principle backpressure valve spring will come through work. When the system pressure than the set pressure hour, under the action of the diaphragm spring force to plug the pipeline; large when the system pressure than the set pressure, the diaphragm compression spring, turning conduit, a liquid through a back pressure valve. Fourth, the use of back-pressure valve in the outlet line, back pressure valve should be used simultaneously and pulsation dampers to absorb traffic peaks between the pump and the back pressure valve with a pulsation damper. When there is no pulsation damper, the back pressure valve with each stroke of the pump will be quickly opened and closed. When pulsation damper, back pressure valve in the half-open and half-closed position oscillation, thus reducing wear pulsation damper can speed back-pressure valve. For high flow pump, and the outlet tubing long and thin, the installation location should be close to the back pressure valve filling points, to reduce the siphon trend. When the delivery medium containing suspended solid in the back pressure valve should be installed with the inlet end of the three-way pipe plug (or four), so that in the case of the pipeline can be cleaned without disassembly. Backpressure valve just a pipeline component, only with other pipeline components (such as pulsation damper, safety valve, check valve, globe valve) used in conjunction to achieve maximum effectiveness. V. Selection Guide diameter pipeline has DN10,15,20,25,32,40,50,65,80,100 ten models. There inlet end pressure 0.3MPa and 1.0MPa two series, the import and export side pressure difference can be adjusted by adjusting the length of the spring. Materials are PVC (P), SS304 / 316 stainless steel (S), carbon steel (A) provide import and export threaded coupling, flange, hose fittings are three ways to choose from. Based on the company's previous experience, technology and professional information available information provided by the user, the user will recommend our material contact parts are made, determined by the user's choice of material. The company does not bear the loss due to wear or corrosion and damage caused by parts or product warranty. VI Notes 1, to avoid system resonance. 2, with the pulsation damper used simultaneously, pulsation dampers should be safe in the back-pressure valve between the pump and to absorb the traffic peaks between the pump and the back pressure valve. Slow down the wear rate of the back pressure valve. 3, outdoor use should be added protective shed or guard. 4, the back pressure valve prior to any maintenance, you should stop functioning equipment, the release of pressure, back pressure valve closed valves associated with the system, while acknowledging there is no pressure pulsation damper. Note to prevent harm to human transmission fluid maintenance. 5, if the back pressure valve and export access, back pressure will grow exponentially, and the risk of harm to the system may occur. 6, running back pressure valve malfunction was found should be promptly cut off the power. Warning: The back pressure valve prior to any maintenance, you should stop functioning equipment, the release of pressure, back pressure valve closed valves associated with the system, while recognizing that there is no pressure pulsation damper. Note to prevent harm to human transmission fluid maintenance.