A spring safety valve with micro-adjustment structure
A micro-adjustment and safety valve technology, which is applied to safety valves, valve devices, balance valves, etc., can solve problems such as poor adjustment accuracy of adjustment screws, unbalanced spring force, and unsatisfactory sealing performance, so as to improve sealing performance and adjust High precision, improved take-off accuracy and sealing performance
Active Publication Date: 2021-05-14
HARBIN HBC VALVE
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Problems solved by technology
[0004] The present invention provides a spring safety valve with a micro-adjustment structure to solve the problems of poor adjustment accuracy of the adjustment screw of the existing spring safety valve, large setting deviation and unsatisfactory sealing performance caused by unbalanced spring force. The spring force is fine-tuned to improve the take-off accuracy and sealing performance of the spring safety valve
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[0017] Such as figure 1 with figure 2 As shown, the present invention is a spring safety valve with a micro-adjustment structure, including: an adjustment screw 8, a spring cover 9, a backing plate 20, a spring 11 and a micro-adjustment structure, the spring cover 9 is installed on the backing plate 20, An installation cavity is formed in the spring cover 9 and the backing plate 20, the spring 11 is located in the installation cavity, the valve stem 22 passes through the backing plate 20, the spring 11, and passes through the top of the spring cover 9, and an upper spring is installed at both ends of the spring 11 Seat 10 and lower spring seat 17, the lower spring seat 17 is installed on the valve stem 22 through the retaining ring 18, the adjustment screw 8 is threadedly connected with the spring cover 9, and the extension end of the adjustment screw 8 is pressed on the top of the upper spring seat 10. On the bearing 19, the spring 11 can be compressed by rotating the adjus...
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The invention discloses a spring safety valve with a micro-adjustment structure, which belongs to the technical field of valves, and is proposed to solve the problem that the pretightening force deviation of the screw adjustment spring in the existing spring safety valve is relatively large. It includes: a spring cover, a pad Plate, spring, adjusting screw and valve stem, the spring cover is installed on the backing plate, the spring is located in the spring cover, the valve stem passes through the backing plate, the spring passes through the top of the spring cover, and upper spring seats are respectively provided at both ends of the spring And the lower spring seat, the lower spring seat is installed on the valve stem through the stop ring, the adjustment screw passes through the spring cover and tightens with the upper spring seat, and the vertical deviation angle D is formed between the stop ring and the lower spring seat after the spring is compressed. A micro-adjustment structure is installed on the outer wall of the spring cover, one end of the micro-adjustment structure passes through the spring cover and is connected with the upper spring seat, and the position of the force exerted by the upper spring seat on the spring is changed by adjusting the other end of the micro-adjustment structure. The invention has the characteristics of simple structure, convenient adjustment process and high adjustment precision.
Description
Technical field: [0001] The invention belongs to the technical field of valves, in particular to a spring safety valve with a micro-adjustment structure. Background technique: [0002] When the medium pressure in the boiler superheater reaches the setting pressure of the safety valve, the safety valve needs to be opened under the action of the medium force to discharge the excess medium and prevent the overpressure of the steam drum, so as to protect the normal operation of the boiler. Therefore, when the boiler is in normal operation, the safety valve is not allowed to open; when the boiler is overpressured, the safety valve must be opened accurately; when the boiler is depressurized, the safety valve must return to the seat under the specified pressure difference and seal. [0003] At present, the following three adjustment methods are usually used for the take-off accuracy and sealing performance of the spring safety valve: first, adjust the preload of the spring by adjus...
Claims
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IPC IPC(8): F16K17/06
CPCF16K17/06
Inventor 张尚义李茂元王明李乃安李洋郑蕾
Owner HARBIN HBC VALVE