Figure 4 ( a) Give priority to the end of the valve without slowly-closing vice valve when as a result, the water hammer pressure 0. 53 MPa; Figure 2 ( b) For the main valve with hydraulic slowly-closing vice valve when the final results, the water hammer pressure 0. 04 MPa。 ( 4) Slowly-closing vice valve can check repair or change, clear the check valve. 2, up and down type check valve structure improvement of up and down type check Industrial Valves, bottom valve, it can be maintained when the pump is going to pump the water column (2); The valve structure improvement is unique in the main valve disc and body stents between adding YiHuan vice valve closed as shown in figure 2. Check valve as downstream open pipeline system, back when the closing of valve, mainly used to avoid the media counter-current, avoid the pump and drive motor reversal and vessel medium discharge; So far is most widespread use disc around the body pin shaft rotary swing check valve and valve core line moving up and down along the body straight type check valve, but the above two kinds of structure of the valve is closed when the medium flow rate from the biggest rapidly-changing zero, to make the pipe inlet pipe side delay unloading a ship with the valve in a sudden rise, so the initiation of piping system damage effectiveness of water hammer, the produce with the ordinary check Industrial Valves diameter is 50 ~ 500 mm [1]. ( 3) Improved structure is simple, easy to produce and exchange. As shown in figure 4 for ordinary structure check valve ( a) Check valve with ordinary structure slowly-closing vice valve ( b) Try comparing the final results. 。 When the media downstream pressure medium opened the disc into the main valve cavity, at the same time promote moderate conflict piston up; Because when medium counter-current, easing conflicts when opening the cylinder inside is full of media, and mitigate conflict between cylinder and disc axial gap is relatively small, because the media gradually after a gap in cylinder with ease conflict, the main valve disc close up conflict utility, pipeline internal water hammer pressure to stem ( FIG. 2) 。 4, claims, 1) The main valve disc open-close safe and secure, slowly-closing vice valve structure is compact, reliable in performance. Try to valve size is 100 mm, the system pressure 0. 5 MPa, flow 5 L/s. 1, swing check valve structure improvement in the original swing check valve disc add slowly-closing vice valve ( FIG. 1) 。 When the pump suddenly resting, show that dynamic truncation after check valve inlet pressure Time curve [4]. To reduce the water hammer effect of check valve, expansion the application range of the check valve, the default on the basis of the original ones, add slowly-closing vice valve, can solve the problem of pipeline water hammer pressure. Between the body and the bottom net add a pad ring, to supplement the height of the disc rise; Cushion cylinder piston and mitigate conflict sees fit and use rubber tightly closed, the disc axis and the piston connection rigidity, easing conflicts between cylinder and valve shaft gap is smaller. ( 2) The main valve disc slowly-closing after quickly closing first, it helps avoid the damage of water hammer, expand the application range of the check valve. Vice valve installation under the main valve disc side or both sides and connected by turnbuckle, medium normal flow when the Industrial Valves opens, media pressure vice valve will open and media after vice valve hole into the main valve outlet, make the pressure relief valve inlet end, the main valve disc opens, the main valve pressure before and after its equilibrium; Medium backflow, the main valve disc under the backflow medium utility quickly closed, and the relief valve body and vice upper cylinder to mitigate conflict, the deputy valve cover screwing in the upper body there is a hole on the cover, the deputy valve disc and its living plug rod empty set with a certain gap, cylinder piston and mitigate conflict between right and use O rubber band tightly closed, the lower part of the piston and the disc to the most simple surface between the tightly closed; When vice valve disc is closed, with the main valve disc close vice valve cover for the utility of perforation, medium quality after perforation gradually into the deputy valve defuse conflicts cylinder body cavity, a small number of media through the deputy valve upstream the gap between the disc and the piston rod, so the vice valve piston is not close quickly. The structure of the main valve closed equivalent to fast closing phase, the deputy valve quickly close not equivalent to slow closing phase, according to the hydrodynamic and pumping unit mechanical transition explained the structure of the preset can have effect to avoid water hammer pressure. Q: the structure of the check valve slowly-closing default answer: according to the usual structure check valve water hammer pressure problems in use, puts forward the additional slowly-closing vice valve preset programs; The improved products have open/close safe and secure, detract from the utility of water hammer pressure. 3, check valve, hydraulic slowly-closing structure before and after improvement of trying to see fit and used to determine the final results of pressure gauge, by elements of the differential pressure transmitter pressure signals will be sent to the oscilloscope records, to determine a good proportion of R on oscillogram read every time of water hammer pressure fluctuation values.
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