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A back pressure valve, double diaphragm technology, applied in the direction of diaphragm valve, diaphragm, valve device, etc., can solve the problems of large flow loss and many turns of the back pressure valve flow passage, achieve small flow resistance, avoid violent oscillation of the spring, reduce The effect of small perturbations
Pending Publication Date: 2018-11-23
CHINA JILIANG UNIV
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[0004] The traditional back pressure valve has many turns in the flow channel, so the flow loss is relatively large
Method used
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[0023] The present invention will be further described below by means of the accompanying drawings.
[0024] Such as figure 1 As shown, the double diaphragm back pressure valve of the present invention consists of valve body 1, valve cover 2, lower diaphragm 3, upper diaphragm 4, bottom plate 5, lower spring seat 6, sleeve 7, valve stem 8, hand wheel 9, thrust The bearing 10, the upper spring seat 11, the damper 12, the spring 13, the load cell 14, the metal support piece 15, and the display unit 16 are composed. The lower diaphragm 3 and the upper diaphragm 4 are separated by a metal support plate 15 to form an intermediate cavity, and the spring 13 and the damper 12 are fixed on the upper diaphragm 4 through the upper spring seat 11, the lower spring seat 6 and the bottom plate 5, and the upstream of the lower diaphragm 3 There is a small hole in the position. A damper 12 is installed between the upper and lower spring seats. The load cell 14 is installed between the lowe...
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Abstract
The invention discloses a double-membrane back pressure valve. The double-membrane back pressure valve comprises a valve body, a bonnet, a valve rod, a force measuring sensor, a spring, membranes, a damper, a display unit and the like and is characterized in that the upper membrane and the lower membrane are separated through a metal support piece to form a middle cavity, the spring and the damperare fixed on the upper membrane through a bottom plate, the upstream position of the lower membrane is provided with a small hole. When the double-membrane back pressure valve is used, a hand wheel is rotated to allow the valve rod to move downwardly, and the valve is closed; when fluid pressure is larger than a set value, the membranes upwardly compress the spring, the back pressure valve is opened, and fluid start flowing; when the fluid pressure is smaller than a set value, the spring pushes the membranes downwardly to close the back pressure valve, and fluid flowing is stopped. The double-membrane back pressure valve has the advantages that by the small hole, the fluid pressure is transmitted into the cavity between the two membranes, the upper membrane is uniformly stressed, the stress of the membranes, the spring and the damper is relatively balanced, and valve movement stability is achieved; by the damper, gentle valve movement is achieved, and disturbance to the flowing is reduced.
Description
technical field [0001] The invention relates to the technical field of flow control valves, in particular to a double diaphragm back pressure valve. Background technique [0002] The function of the back pressure valve is to maintain the required pressure in the pipeline so that the pump in the pipeline can output the flow normally. For example, for volumetric pumps such as metering pumps, excessive delivery will occur when working under low pipeline pressure. In order to prevent this problem, it is necessary to have a certain back pressure at the outlet of the metering pump. Generally, a back pressure valve is installed at the outlet of the metering pump. achieve this purpose. [0003] The structure of the traditional back pressure valve is similar to that of the one-way flow valve. The pressure control is realized by the built-in spring. When the fluid pressure in the pipe is lower than the set pressure, the diaphragm closes the valve under the action of the spring force....
Claims
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