Check valve as the pipeline system when the downstream open, the valve is closed when the counter-current, mainly used to prevent media backflow, to prevent the pump and drive motor reversal and the release of media within the container; the most common use is the valve around the body pin Axis rotation of the swing check valve and valve along the valve vertical axis of vertical movement of the lift check valve, but the above two kinds of structure of the valve are shut down when the medium speed from the maximum rapidly reduced to zero, causing the pipeline One side of the inlet pipe pressure rapidly increased, resulting in a damaging effect on the piping system of water hammer phenomenon, so the general check valve production diameter of 50 ~ 500mm. In order to reduce the water hammer effect of the check valve, expand the use of check valve, based on the original product, the addition of slow closing valve, to solve the problem of water hammer and pipe pressure. Aiming at the problem of water hammer boost in the use of check valve of common structure, the design scheme of adding slow closing auxiliary valve is put forward. The improved product has the function of smooth opening and closing and reducing water hammer pressure. Slow-closing check valve is mainly used for water, water, sewage, sea water and other media for the water supply and drainage pipes installed at the pump out of the Department, to cut off the media back to eliminate atomic damage water hammer, protection and Road The safe operation of the pump. Its main features: 1, small body, light weight, the length of the structure is only about one-third swing check valve. 2, slow closing system performance, not affected by the medium in the pipeline, the valve flap closed after the first speed, to prevent the destructive water hammer. 3, soft rubber seal, closed performance, wear resistance, long service life. 4, rubber buffer, smooth opening and closing, no vibration, no noise. 5, than the old check valve flow resistance, there are obvious energy-saving effect. Swing check valve structure improvement: the original swing check valve flap slow relief valve added. Deputy valve installed in the main valve flap on the side or both sides and threaded connection, the normal flow of medium valve is opened, the media pressure will open the deputy valve, medium flow through the deputy valve orifice into the main valve outlet, the main valve inlet end Pressure relief, the main valve flap open, the main valve before and after the pressure tends to balance; medium countercurrent, the main valve flap quickly closed under the action of counter-current medium, while the deputy valve body upper buffer cylinder, deputy valve cover screw valve The upper part of the body is covered with a small hole, the auxiliary valve disc and the piston rod are empty with a certain clearance, the piston and the buffer cylinder are sealed with an O-shaped rubber ring, and the plane between the lower part of the piston and the valve disc is sealed; When the valve closes with the main valve flap, the medium gradually flows into the upper chamber of the sub-valve buffer cylinder through the small hole due to the function of the orifice of the sub-valve cover, and part of the medium flows back through the gap between the sub-valve flap and the piston rod , So the secondary valve piston is slowly closed. The closing of the main valve of the structure is equivalent to the quick closing phase, and the slow closing of the auxiliary valve is equivalent to the slow closing phase. According to the hydraulic and mechanical transition mechanism of the pump station, the structure design can effectively prevent the water hammer from increasing. In summary (1) Main valve flap opening and closing smooth, slow closure Vice valve compact structure, reliable performance. (2) The main valve flap slow closure after the first clearance, which can effectively prevent destructive water hammer, expanding the use of check valve. (3) Improve the structure is simple, easy to produce and exchange. (4) Slow closing vice valve can be repaired or replaced, without affecting the use of check valve. Lift check valve structure improvements: lift check valve, also known as the end of the valve, it can pump to maintain the required pumping water column; the valve structure improvement is characterized by the main valve flap valve body bracket and a slow addition Vice valve closed. A pad ring is added between the valve body and the bottom net to increase the height of the valve flap rising; a rubber seal is adopted for the buffer piston and the buffer cylinder, the valve shaft and the piston are rigidly connected, and the gap between the buffer cylinder and the valve disc shaft is small. When the media downstream, the pressure medium to open the valve flap into the main valve cavity, while pushing the buffer piston up; when the media backwards, due to open the buffer cylinder is already full of media inside the opening, and buffer cylinder and valve shaft gap between the more Therefore, with the gradual discharge of the buffer tank medium through the gap, the main valve flap closes play a buffer role, so that the network water hammer to boost pressure to be controlled.
PD Toys plastic Co., Ltd is OEM & ODM manufacturer of inflatable products in the mainland of China with more 17 years of manufacturing experience. products ranges are Inflatable Toys, inflatable pools, inflatable pool floats, towable tubes, Air Furniture and Promotional Items etc. total have more than 1500 employees (4 factories) related to PVC inflatable products.
Operated under ISO 9001:2015 management system, We had passed factory Audit by Walmart, Taret, Disney ect, also passed all necessary certificates and testing such as ICTI, BSCI, SEMTA,Target FA, NBC Universal, FCCA, SGS, CVS Security, GSV, Disney FAMA ect. We have our own PVC raw materials manufacturing company, all the PVC we produced are compliance with European EN71, American ASTM standard and NON PHTHALATE (6P) standard.
Ocean Ball,Beach Ball,Inflatable Beach Ball,Ball Pit Balls
P&D Plastic Manufacture Co., Ltd , https://www.jmpoolfloat.com