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. When the media downstream pressure medium opened the disc into the main valve cavity, cultivate with the valve drive piston up ease conflicts; 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 small, because the media gradually after a gap in cylinder with ease conflict, the main valve disc close up conflicts, to curb pipeline internal water hammer pressure. ( 4) Slowly-closing vice valve can check repair or change, clear the check valve. 1, swing check valve structure improvement in the original swing check valve disc add slowly-closing vice valve. Between the body and the bottom net add a pad ring, to supplement the height of the disc rise; Defuse conflicts and use a rubber cylinder piston and mitigate conflict thought fit tightly closed, the disc axis and the piston connection rigidity, easing conflicts between cylinder and disc axial gap is smaller. Q: the structure of the wafer check valves slowly-closing default answer: wafer check valves as downstream open pipeline system, back when the closing of valve, is mainly used to avoid the media flow, to 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, so that the pipe inlet pipe on one side of the internal pressure speed increases, so the initiation of piping system damage effectiveness of water hammer, so produce ordinary check valve diameter is 50 ~ 500 mm [1]. 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; The main valve with slowly-closing vice valve when the final results, the water hammer pressure 0. 04 MPa。 4, claims, 1) The main valve disc open-close safe and secure, slowly-closing vice valve structure is compact, reliable in performance. ( 3) Improvement of simple structure, 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 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. Try to valve size is 100 mm, the system pressure 0. 5 MPa, flow 5 L/s. Vice valve installed in the main valve disc side or both sides and connected by turnbuckle, medium normal flow when the valve opens, media pressure will vice valve opens, media after vice valve hole into the main valve outlet, make the main valve inlet end pressure relief, 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 piston rod with empty sets have 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 tightly closed; When vice valve disc is closed, with the main valve disc close vice valve cover for the utility of perforation, medium through hole into vice valve gradually ease conflict on the 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. 。 2, up and down type check valve structure improvement of up and down type check valve, 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. ( 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. The structure of the main valve closed equivalent to fast closing phase, the deputy Industrial Valves quickly close not equivalent to slow closing phase, according to the hydrodynamic and pumping unit mechanical transition explained the structure of the preset can work to avoid water hammer pressure. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly valve, gate valve, globe valve, check valve, relief Industrial Valves, safety valve, Marine valve, oil valve, hydraulic control valve and other kinds of valves.
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