Two-stage opening type large-flow-rate safety valve

Abstract

The invention discloses a two-stage opening type large-flow-rate safety valve, which comprises a valve body, wherein the front end of the valve body is provided with a threaded joint, a valve core is arranged in the valve body and the threaded joint, the front part of the valve core is provided with a sealing pad, a spring is arranged between the back part of the valve core and the back wall of the valve body, a cone surface soft seal is formed between the threaded joint and the sealing pad, an air release hole and a large-flow-rate liquid discharge hole are formed in the threaded joint, the core part of the valve core is provided with a throttle long hole with fixed diameter and length, the back wall of the valve body is provided with a through hole, and a second safety valve is arranged in the through hole. The two-stage opening is realized through the valve body and the two-stage safety valve, during the small-flow-rate liquid discharge, only the two-stage safety valve is opened, and when the pressure is tool high, the valve core opens the great-flow-rate liquid discharge under the pressure difference effect. The high pressure can be released instantly, the equipment is protected from being damaged by high-pressure impact, the opening is sensitive, the flow rate is high, and a hydraulic support frame oil cylinder can be well protected.

Description

technical field

[0001] The invention relates to a hydraulic support accessory for coal mines, in particular to a two-stage opening type large flow safety valve. Background technique

[0002] With the continuous development of hydraulic supports for fully mechanized mining equipment in coal mines, the working resistance of hydraulic supports is increasing, and the diameter of hydraulic cylinders exceeds 500mm. This requires higher and higher performance requirements for large-flow safety valves used on hydraulic support hydraulic cylinders. When the old top comes to press, the high-pressure liquid in the column must be quickly unloaded by the column safety valve, so as to prevent the column from being damaged and protect the constant resistance of the column support. Therefore, whether the safety valve can unload in time directly affects the strength, safety factor and direct protection ability of the support.

[0003] The safety valve in the prior art is mainly composed of ...

Examples

specific Embodiment approach

[0013] The preferred embodiment of the two-stage open-type high-flow safety valve of the present invention is:

[0014] It includes a valve body, the front end of the valve body is provided with a threaded joint, the valve body and the threaded joint are provided with a valve core, the front part of the valve core is equipped with a gasket, and the rear part of the valve core is connected to the A spring is provided between the rear wall of the valve body, and a tapered surface-soft seal is formed between the threaded joint and the gasket;

[0015] The threaded joint is provided with an air release hole and a large flow discharge hole, and the core of the valve core is provided with a long throttle hole with a fixed diameter and length;

[0016] The rear wall of the valve body is provided with a through hole, and the second safety valve is installed in the through hole.

[0017] The threaded joint is provided with eight φ6mm large flow discharge holes and one φ1.5mm air relea...

specific Embodiment

[0024] Such as figure 1 As shown, it includes a threaded joint 1 with a large flow channel, the pressure spring 7 set in the spring chamber of the valve body 6 acts on the valve core 5, and the sealing gasket 3 is fixed on the valve body through the protective sleeve 2 and the sliding sleeve 4. A valve core assembly is formed on the core 5; the sealing gasket 3 and the threaded joint 1 form a conical-soft sealing joint;

[0025] The working principle of the two-stage open large flow safety valve is as follows:

[0026] When the pressure is not very rapid, the pressure is released by the FAD125 / 50 safety valve 9, and the threaded joint 1 and the gasket 3 are not sealed; Finally, the FAD125 / 50 safety valve 9 cannot meet the requirements, and the pressure difference between the front and rear of the valve core 5 is formed. When a certain value is reached, the valve core assembly compression spring 7 moves, and the sealing pair between the gasket 3 and the threaded joint 1 fails,...

technical field

[0001] The invention relates to a hydraulic support accessory for coal mines, in particular to a two-stage opening type large flow safety valve. Background technique

[0002] With the continuous development of hydraulic supports for fully mechanized mining equipment in coal mines, the working resistance of hydraulic supports is increasing, and the diameter of hydraulic cylinders exceeds 500mm. This requires higher and higher performance requirements for large-flow safety valves used on hydraulic support hydraulic cylinders. When the old top comes to press, the high-pressure liquid in the column must be quickly unloaded by the column safety valve, so as to prevent the column from being damaged and protect the constant resistance of the column support. Therefore, whether the safety valve can unload in time directly affects the strength, safety factor and direct protection ability of the support.

[0003] The safety valve in the prior art is mainly composed of ...

Examples

specific Embodiment approach

[0013] The preferred embodiment of the two-stage open-type high-flow safety valve of the present invention is:

[0014] It includes a valve body, the front end of the valve body is provided with a threaded joint, the valve body and the threaded joint are provided with a valve core, the front part of the valve core is equipped with a gasket, and the rear part of the valve core is connected to the A spring is provided between the rear wall of the valve body, and a tapered surface-soft seal is formed between the threaded joint and the gasket;

[0015] The threaded joint is provided with an air release hole and a large flow discharge hole, and the core of the valve core is provided with a long throttle hole with a fixed diameter and length;

[0016] The rear wall of the valve body is provided with a through hole, and the second safety valve is installed in the through hole.

[0017] The threaded joint is provided with eight φ6mm large flow discharge holes and one φ1.5mm air relea...

specific Embodiment

[0024] Such as figure 1 As shown, it includes a threaded joint 1 with a large flow channel, the pressure spring 7 set in the spring chamber of the valve body 6 acts on the valve core 5, and the sealing gasket 3 is fixed on the valve body through the protective sleeve 2 and the sliding sleeve 4. A valve core assembly is formed on the core 5; the sealing gasket 3 and the threaded joint 1 form a conical-soft sealing joint;

[0025] The working principle of the two-stage open large flow safety valve is as follows:

[0026] When the pressure is not very rapid, the pressure is released by the FAD125 / 50 safety valve 9, and the threaded joint 1 and the gasket 3 are not sealed; Finally, the FAD125 / 50 safety valve 9 cannot meet the requirements, and the pressure difference between the front and rear of the valve core 5 is formed. When a certain value is reached, the valve core assembly compression spring 7 moves, and the sealing pair between the gasket 3 and the threaded joint 1 fails,...

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