check valve is upstream of the valve open and close and a pipe system is mainly used to prevent the backflow medium, the reversal of the pump and drive motor, and emissions of containers within the medium. Is currently the most commonly used revolve around the valve pin shaft rotate the check and the ascension of moving along the vertical center line of valve body check, but the above two kinds of structure of the valve is water hammer phenomenon, lead to valve closing, inlet side of the internal pressure increases rapidly, water hammer phenomenon, destructive effect on pipeline system. General check valve production diameter of 50 * 500 mm ( 1) 。 To reduce the number of check valve water hammer effect, enlarge the application range of the check valve, the author on the basis of original products, auxiliary valve designed with slow customs, solve the problem that the pipeline water hammer booster. 1. Rotate the check structure improvement of a slow close auxiliary valve is added to the original rotate the check valve and auxiliary valve installed in the bottom of the main valve disc or sides, and screw thread connection. When the normal flow of the medium valve opens, media pressure auxiliary valve opening, medium by auxiliary valve orifice flow into the main valve outlet to reduce to the main valve inlet pressure, the main valve is opened, the main valve pressure before and after coming back into balance. When the medium is countercurrent, under the action of the main valve disc in the current media quickly closed, and the upper part of the auxiliary body for buffer cylinder, auxiliary valve cover with holes rotate into the upper part of the body, auxiliary valve tray and its plug rod empty set there is a certain gap, piston and cylinder buffer with O shaped rubber ring seal, piston and the bottom of the disc seal on the plane. When auxiliary disc plate as the main valve disc close and closing, as a result of the action of auxiliary valve cover holes, the media gradually through the holes into the auxiliary valve buffer cylinder cavity, on the part of the medium backflow through auxiliary valve plate and the clearance between the piston rod, thus auxiliary valve piston slowly close. Structure of the main valve closed is equal to the fast closing phase, auxiliary valve close equivalent to slow slow phase. According to the principle of hydraulic and mechanical transition of pumping unit, show that the structural design can effectively prevent water hammer. 2. Lift check valve structure improvement of lift check valve, also known as the bottom valve, can keep the suction column ( 2) When pump is closed. The characteristics of the valve structure improvement is added between the main valve disc and body support a slow closing of the auxiliary valve add gasket between the body and bottom nets, to supplement the height of the disc to rise; Buffer and buffer tank with a rubber seal, piston valve shaft and piston, rigid connection between buffer cylinder and valve shaft gap is smaller. When the downward flow of the medium, medium pressure to push the disc in the valve cavity and cushioning piston push up; When medium inversion, due to the buffer cylinder when open the buffer tank filled with dielectric, and buffer with less disc axial clearance between the cylinder and main valve is closed to buffer effect, thereby can control the pipeline network of water hammer pressure. 3. Improve the check valve slowly closed structure before and after the test results. After using the calibration of pressure gauge, differential pressure transmitter will pressure signal is sent to the oscilloscope, record the pressure signal, the calibration ratio R able to read each point on the oscillograph water hammer pressure change value. 4. Conclusion the main results were as follows: ( 1) The main valve opening and closing is stable, compact structure, reliable in performance. ( 2) Main valve closed quickly, then slowly close, effectively prevent the damage of water hammer, enlarge the using range of the check valve. ( 3) Improved structure, simplify the list to facilitate production and exchange. ( 4) Can be used in not impede check valves, closed auxiliary valve repair or replacement is slow.

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