CN203309228U

CN203309228U - Safety valve

Info

Publication number: CN203309228U
Application number: CN2013203676712U
Authority: CN
Inventors: 陈志方
Original assignee: NINGBO TONGXIN VALVE & FITTING Co Ltd
Current assignee: NINGBO TONGXIN VALVE & FITTING Co Ltd
Priority date: 2013-06-18
Filing date: 2013-06-18
Publication date: 2013-11-27
Anticipated expiration: 2023-06-18

Abstract

The utility model relates to a safety valve. The safety valve comprises a valve body, wherein the valve body is provided with a main flow passage and a pressure relief flow passage which is communicated with the main flow passage; a pressure relief component for opening the pressure relief flow passage when the pressure exceeds a set value is arranged in the valve body; a non-return component is arranged in the main flow passage and comprises a pedestal, a top cover and a mandrel; the mandrel is arranged on the pedestal and movably penetrates through the top cover; the top cover is provided with a through hole for a fluid to flow through; the pedestal can move relative to the main flow passage; the non-return spring is arranged between the pedestal and the top cover; under the elasticity of the non-return spring, the main flow passage is closed by the pedestal. According to the safety valve, the non-return component is additionally arranged in the valve body; the main flow passage is closed by the pedestal under the action of elasticity of the non-return spring; the forwardly flowing fluid overcomes the elasticity of the non-return spring to push the pedestal open so as to flow smoothly; when the fluid flows back in the main flow passage, the non-return spring pushes the pedestal to close the main flow passage so as to effectively prevent reflow.

Description

Safety valve

Technical field

The utility model belongs to valve technology field, relates in particular to a kind of safety valve.

Background technique

Safety valve is a kind of safety protection valve; its open-shut device is subjected to be in normally off under External Force Acting; pressure medium in equipment or pipeline raises, and automatically opens while surpassing specified value, prevents that by outside system, discharging medium in pipeline or equipment, pressure medium surpasses specified value.Safety valve belongs to the self-acting valve class, is mainly used on boiler, pressurized container and pipeline, and pilot pressure is no more than specified value, and personal safety and equipment have been moved to important protective action.

Existing safety valve, in opening the process of pressure release, usually has the phenomenon generation that fluid flows backwards, and this has formed potential safety hazard to pipeline or equipment, and serious also security incident can occur.

Summary of the invention

The purpose of this utility model is, a kind of safety valve that prevents that fluid from flowing backwards is provided.

To achieve these goals, the technical solution adopted in the utility model is: a kind of safety valve, comprise valve body, the pressure release runner that valve body has sprue and is communicated with sprue, in valve body, be provided with for when pressure surpasses setting value, opening the pressure release assembly of pressure release runner, in sprue, be provided with the non-return assembly, the non-return assembly comprises base, top cover and mandrel, mandrel is arranged on base also movably from top cover, passing, top cover has the through hole passed through for fluid, base can move relative to sprue, check spring is arranged between base and top cover, under the elastic force effect of check spring, base is closed sprue.

The utility model has been set up the non-return assembly in valve body, under the elastic force effect of check spring, base is closed sprue, the fluid of forward flow overcomes the elastic force of check spring pushes base open, fluid passes through smoothly, and when the fluid backflow occurred in sprue, check spring promoted base, sprue is closed, and effectively having prevented from refluxing occurs.

The accompanying drawing explanation

Fig. 1 is the sectional view of the utility model safety valve.

Below in conjunction with accompanying drawing, the utility model is described in detail.

Embodiment

Referring to Fig. 1, valve body 1 has the sprue 31 of perforation and the pressure release runner 32 be communicated with sprue 31, in sprue 31, be provided with the non-return assembly, the non-return assembly comprises base 2, top cover 4 and mandrel 3, mandrel 3 is arranged on base 2 also movably from top cover 4, passing, top cover 4 is threaded connection the top that is arranged on sprue 31, on it, has the through hole passed through for fluid, base 2 is arranged on the below of top cover 4, can move relative to sprue 31, check spring 5 is arranged between base 2 and top cover 4, its underpart is pressed on base 2, upper end portion is pressed on top cover 4, under the elastic force effect of check spring 5, base 2 is closed sprue 31.When having fluid to enter sprue 31, the fluid of forward flow overcomes the elastic force of check spring 5 pushes base 2 open, and fluid is successfully from passing through sprue 31; When the fluid backflow occurred in sprue, check spring 5 promoted base 2 under its elastic force effect, base 2 is pressed on valve body 1 sprue is closed, and has effectively prevented fluid generation reverse backflow.

Mandrel 3 is from turriform spring 6, passing, and a side pressure of turriform spring 6 is on base 2, and the other end is pressed on the boss of mandrel 3, and this can guarantee further that base 2 can run-off the straight.The lower end surface of base 2 is provided with sealing gasket 7, and sealing gasket 7 contacts with valve body 1 when sprue 31 is closed, and has strengthened the sealing effect between base 2 and valve body 1.

In valve body 1, be provided with for when hydrodynamic pressure surpasses setting value, opening the pressure release assembly of pressure release runner 32, when the hydrodynamic pressure in sprue 31 does not surpass setting value, the pressure release assembly is closed pressure release runner 32, when the hydrodynamic pressure in sprue 31 surpassed setting value, the pressure release assembly was opened the pressure release runner to carry out pressure release.The pressure release assembly comprises valve seat 10, valve rod 11, spring 12, valve gap 13 and regulates cap 14, valve gap 13 is threaded with valve body 1, regulating cap 14 is threaded with valve gap 13, valve rod 11 passes from regulate cap 14 and the one end is arranged on valve seat 10, spring 12 is arranged on valve seat 10 and regulates between cap 14, under the elastic force effect of spring 12, valve seat 10 is closed pressure release runner 32.Can change the reduction length of spring 12 by rotation regulating nut 14, thereby change the elastic force of spring 12, the setting pressure of safety valve namely, the setting party of regulating nut 14 the adjusting of safety valve setting pressure.When the hydrodynamic pressure in sprue exceeded setting pressure, spring 12 further compressed, and valve seat 10 and valve rod 11 move right together, and pressure release runner 32 is opened to carry out pressure release.

The pressure release assembly also comprises turriform rubber ring 15, and a side pressure of turriform rubber ring 15 is between valve seat 10 and spring 12, and the other end is pressed between valve body 1 and valve gap 13.The setting of turriform rubber ring 15 can make the entrance of pressure release runner open greatlyr, has improved pressure release speed, the seal action that while turriform rubber ring 15 plays between valve body 1 and valve gap 13.Lower bullet pad 17 is pressed between turriform rubber ring 15 and spring 12, and upper bullet pad 18 is pressed in spring 12 and regulates between cap 14.Valve seat 10 is provided with rubber pad 16, and rubber pad 16 contacts with valve body 1 when pressure release runner 32 is closed, and rubber pad 16 has strengthened the sealing effect when valve seat 10 is closed the pressure release runner.The outer end of valve rod 11 arranges starter ring 21 by brass pin 20, can carry out manual pressure release by pulling starter ring 21.

Claims

1. safety valve, comprise valve body (1), the pressure release runner (32) that valve body (1) has sprue (31) and is communicated with sprue (31), in valve body (1), be provided with for when hydrodynamic pressure surpasses setting value, opening the pressure release assembly of pressure release runner (32), it is characterized in that, in described sprue (31), be provided with the non-return assembly, the non-return assembly comprises base (2), top cover (4) and mandrel (3), it is upper also movably from top cover (4), passing that mandrel (3) is arranged on base (2), top cover (4) has the through hole passed through for fluid, base (2) can move relative to sprue (31), check spring (5) is arranged between base (2) and top cover (4), under the elastic force effect of check spring, base (2) is closed sprue (31).

2. safety valve according to claim 1, is characterized in that, described mandrel (3) is from turriform spring (6), passing, and a side pressure of turriform spring (6) is upper at base (2), and the other end is pressed on the boss of mandrel (3).

3. safety valve according to claim 2, is characterized in that, on described base (2), is provided with sealing gasket (7), sprue (31) while closing sealing gasket (7) with valve body (1), contact.

4. safety valve according to claim 1, it is characterized in that, described pressure release assembly comprises valve seat (10), valve rod (11), spring (12), valve gap (13) and regulates cap (14), valve gap (13) is connected with valve body (1), regulating cap (14) is threaded with valve gap (13), valve rod (11) passes from regulate cap (14) and the one end is arranged on valve seat (10), spring (12) is arranged on valve seat (10) and regulates between cap (14), under the elastic force effect of spring (12), valve seat (10) is closed pressure release runner (32).

5. safety valve according to claim 4, it is characterized in that, described pressure release assembly also comprises turriform rubber ring (15), one side pressure of turriform rubber ring (15) is between valve seat (10) and spring (12), and the other end is pressed between valve body (1) and valve gap (13).

6. safety valve according to claim 5, it is characterized in that, described pressure release assembly also comprises lower bullet pad (17) and upper bullet pad (18), lower bullet pad (17) is pressed between turriform rubber ring (15) and spring (12), and upper bullet pad (18) is pressed in spring (12) and regulates between cap (14).

7. safety valve according to claim 5, is characterized in that, on described valve seat (10), is provided with rubber pad (16), pressure release runner (32) while closing rubber pad (16) with valve body (1), contact.

8. safety valve according to claim 5, is characterized in that, by brass pin (20), starter ring (21) is set in the outer end of described valve rod (11).