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A spring-type safety valve with a new type of back pressure adjustment mechanism and its application method

A technology for adjusting mechanisms and safety valves, applied in safety valves, balance valves, valve devices, etc., can solve the problems of large leakage of spring-type safety valves, affecting the sealing performance of safety valves, and slow valve opening speed, so as to improve safety , Improve sealing performance, reduce the effect of large pressure difference between opening and closing

Active Publication Date: 2022-04-12
HARBIN HBC VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention solves the problem that the traditional spring-type safety valve has a large amount of leakage in the pre-discharge stage, slow valve opening speed and poor stability in the take-off stage and discharge stage, and a large opening and closing pressure difference in the reseating stage, which affects the reseating state of the safety valve. The problem of the sealing performance under the condition, and then disclosed "a spring type safety valve with a new type of back pressure adjustment mechanism and its use method"

Method used

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  • A spring-type safety valve with a new type of back pressure adjustment mechanism and its application method
  • A spring-type safety valve with a new type of back pressure adjustment mechanism and its application method
  • A spring-type safety valve with a new type of back pressure adjustment mechanism and its application method

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specific Embodiment approach 1

[0039] Specific implementation mode one: combine Figure 1-Figure 6Describe this embodiment, a spring safety valve with a new type of back pressure adjustment structure in this embodiment, including a valve body assembly 20, a cooler 17, and a spring bonnet mechanism, and a valve body assembly 20, a cooler 17, and a spring bonnet mechanism Connected sequentially from bottom to top, the bottom of the valve body assembly 20 is provided with an inlet flow channel, the side end of the valve body assembly 20 is provided with an outlet flow channel, the valve body assembly 20 is provided with a guide sleeve 18 and a valve core 19, and the valve core 19 is arranged on The guide sleeve 18 forms a sealing surface with the inlet channel of the valve body assembly 20. The valve stem 8 passes through the spring bonnet mechanism and the cooler 17 to connect with the valve core 19. The cooler 17 is provided with an exhaust chamber 5 and an exhaust chamber. The pipe 6, the exhaust chamber 5 ...

specific Embodiment approach 2

[0041] Specific implementation mode two: combination Figure 1-Figure 6 Describe this embodiment, a spring safety valve with a new type of back pressure adjustment structure in this embodiment, the spring bonnet mechanism includes a spring cover 7, a lower spring seat 9, a spring 10, an upper spring seat 11, an adjustment screw 12 and The stem nut 16 and the spring cover 7 are arranged on the cooler 17, the spring cover 7 is provided with the lower spring seat 9, the spring 10 and the upper spring seat 11, and the lower spring seat 9, the spring 10 and the upper spring seat 11 are set on the valve in turn. On the stem 8, the valve stem 8 is connected with the spring cover 7 through the adjustment screw 12, the upper spring seat 11 is fixedly connected with the adjustment screw 12, the end of the valve stem 8 is installed with a stem nut 16, and the stem nut 16 is used to control the valve stem 8 moves up and down, the lower spring seat 9, spring 10 and upper spring seat 11 in ...

specific Embodiment approach 3

[0042] Specific implementation mode three: combination Figure 1-Figure 6 Describe this embodiment, a spring safety valve with a new type of back pressure adjustment structure in this embodiment, the spring cover 7 is provided with a small cover 15, a handle 13 and a shift fork 14 are installed on the small cover 15, and the shift fork 14 Set between the adjustment screw 12 and the stem nut 16, the handle 13 is set under the shift fork 14 and contacts with one end of the shift fork 14, on the basis of the second specific embodiment, a small cover 15 is set on the top of the spring cover 7, A handle 13 and a shift fork 14 are hingedly arranged on the small cover 15, and the shift fork 14 is driven by the control handle 13 to move the valve stem 8 up and down, so as to manually control the opening and closing of the safety valve, thereby achieving the effect of pressure relief in the safety valve.

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Abstract

A spring-type safety valve with a novel back pressure adjustment mechanism and a use method thereof belong to the field of overpressure protection devices for boiler steam drums and superheaters. The invention solves the problem that the traditional spring-type safety valve has a large amount of leakage in the pre-discharge stage, slow valve opening speed and poor stability in the take-off stage and discharge stage, and a large opening and closing pressure difference in the reseating stage, which affects the reseating state of the safety valve. Under the sealing performance problem. The cooler of the present invention is provided with an exhaust chamber and an exhaust pipe, the exhaust chamber communicates with the exhaust pipe, the exhaust chamber is provided with a back pressure adjustment mechanism, and the back pressure adjustment mechanism forms a sealing surface with the inlet end of the exhaust chamber. The back pressure spring of the back pressure adjustment mechanism is arranged between the back pressure lower spring seat and the back pressure upper spring seat, the back pressure lower spring seat forms a sealing surface with the entrance of the exhaust chamber, and the back pressure upper spring seat passes through the set screw Connected to the valve stem. Through the safety valve of the present invention, the stability in the working process is effectively improved, and at the same time, waste of steam medium is avoided.

Description

technical field [0001] The invention relates to a spring type safety valve, which belongs to the field of overpressure protection devices for boiler steam drums and superheaters. Background technique [0002] Boiler superheater spring safety valve is to automatically discharge a certain amount of steam when the pressure of high-temperature and high-pressure steam exceeds the design value, so as to prevent overpressure of the superheater and protect the normal operation of the boiler. A qualified boiler superheater spring safety valve can quickly protrude to the full stroke under the set pressure; when the boiler pressure drops to the specified range, the safety valve will quickly return to the seat and seal, according to the regulations of the "Steam Boiler Safety Technical Supervision Regulations" , The setting pressure of the safety valve is 1.05 to 1.08 times the working pressure of the boiler, and the unit specific pressure generated by the spring force on the sealing su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K17/04F16K17/06F16K17/164F16K49/00
CPCF16K17/044F16K17/048F16K17/06F16K17/164F16K49/00
Inventor 李乃安张尚义李茂元李洋苏枫宋书旭张晓东郑蕾
Owner HARBIN HBC VALVE
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