Self-pressure-relief corrugated pipe stop valve

Abstract

The utility model discloses a self-pressure-relief corrugated pipe stop valve which comprises a valve body, and a first channel and a second channel are formed in the valve body. The valve rod is mounted in the valve body, and a corrugated pipe is mounted on the valve rod; the sealing block is installed on the valve rod and used for separating the first channel and the second channel, and a pressure relief channel is formed in the sealing block; the pressure relief assembly is arranged in the sealing block and used for blocking the pressure relief channel. According to the pressure relief valve, the pressure relief channel is blocked through the pressure relief assembly in a conventional state, when the pressure of a medium is too large, the medium can enter the pressure relief channel through the pressure relief assembly and then flow into the second channel from the first channel, self pressure relief is achieved, and the problem that the pressure of the medium is too large and cannot be released is solved.

Description

Technical Field

[0001] The utility model relates to the field of globe valves, and particularly to a self-relieving bellows globe valve. Background Art

[0002] A globe valve, also known as a stop valve, belongs to a forced-sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve flap to prevent leakage at the sealing surface. Chinese Patent CN202323296765.8 discloses a sealed globe valve, comprising: a globe valve body; a limit seat provided at the top of the globe valve body; a first piston seat provided at the top of the limit seat; a second piston seat provided at the bottom of the globe valve body; a connecting pipe provided between the second piston seat and the first piston seat; a threaded rod screwed onto the top of the first piston seat; a first piston rotatably provided at the bottom of the threaded rod; a valve stem provided at the central position of the bottom of the first piston; the first valve plate and the second valve plate move synchronously towards the valve port to seal the top and bottom of the valve port, achieving double-sided sealing. When the sealing performance of the second valve plate deteriorates or is damaged, the globe valve body still has the ability of cut-off sealing, which can also reduce the impact of the medium on the first valve plate, reduce the damage to the first valve plate, extend the service life of the first valve plate, and improve the sealing performance of the globe valve body.

[0003] The existing globe valves have the following problems: the medium pressure is too high to be released. Due to the sealing of the globe valve, the conveying pipe is pressurized, posing a safety hazard.

[0004] Based on the above situation, there is an urgent need for a self-relieving bellows globe valve to solve the problem that the medium pressure is too high to be released. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that for the existing globe valves, the medium pressure is too high to be released. Due to the sealing of the globe valve, the conveying pipe is pressurized, posing a safety hazard.

[0006] The technical solution of the utility model is as follows:

[0007] A self-relieving bellows globe valve, comprising:

[0008] A valve body, in which a first channel and a second channel are formed;

[0009] A valve stem, installed in the valve body, and a bellows is installed on the valve stem;

[0010] A sealing block, installed on the valve stem and used to separate the first channel and the second channel, and a pressure relief channel is formed in the sealing block;

[0011] A pressure relief assembly, arranged in the sealing block and used to block the pressure relief channel.

[0012] In the existing globe valve, when the medium pressure is too high, it cannot be released. Due to the sealing of the globe valve, the pressure inside the conveying pipe is increased, posing a safety hazard. In this solution, under normal conditions, the pressure relief channel is blocked by the pressure relief component. When the medium pressure is too high, the pressure relief component can allow the medium to enter the pressure relief channel, and then flow from the first channel into the second channel to achieve self-pressure relief, solving the problem that the medium pressure is too high and cannot be released.

[0013] Furthermore, the specific structure of the pressure relief component is not uniquely defined in this solution. One feasible solution is that the pressure relief component includes a pressure relief rod installed inside the valve stem, and a sealing gasket elastically contacting the pressure relief channel is installed on the pressure relief rod. When this solution is adopted, when the medium pressure is too high, the sealing gasket can be separated from the pressure relief channel, and then the first channel is connected to the second channel. After the medium pressure is reduced to a preset value, the sealing gasket is reset under the action of elastic force and contacts the pressure relief channel, realizing automatic pressure relief and flow interception.

[0014] Furthermore, in order to adjust the pressure relief threshold, one feasible solution is that the pressure relief component further includes a pressure adjustment module. When this solution is adopted, the pressure relief threshold is adjusted through the earth pressure adjustment module.

[0015] Furthermore, the specific structure of the pressure adjustment module is not uniquely defined in this solution. One feasible solution is that the pressure adjustment module includes a spring installed inside the valve stem. The spring is connected to an adjustment pipe, and a limit knob for fixing the adjustment pipe is installed on the valve stem. When this solution is adopted, by removing the limit knob, different lengths of adjustment pipes can be replaced, enabling the spring to undergo different degrees of deformation, providing different magnitudes of elastic force to the sealing gasket, and thus realizing the adjustment of the pressure relief threshold.

[0016] Furthermore, in order to facilitate visually reflecting the working state of the sealing gasket, one feasible solution is that the pressure relief rod penetrates through the limit knob and extends outward. When this solution is adopted, by observing whether the pressure relief rod is in a static state, it can be reflected whether the sealing gasket is static.

[0017] Furthermore, in order to prevent the medium from overflowing from the pressure relief rod, one feasible solution is that a sealing ring is installed on the pressure relief rod. When this solution is adopted, the sealing ring can prevent the medium from overflowing.

[0018] Compared with the existing technology, the beneficial effects of the present utility model are:

[0019] First, under normal conditions, the pressure relief channel is blocked by the pressure relief component. When the medium pressure is too high, the pressure relief component can allow the medium to enter the pressure relief channel, and then flow from the first channel into the second channel to achieve self-pressure relief, solving the problem that the medium pressure is too high and cannot be released;

[0020] 2. Since the pressure relief component includes a pressure relief rod installed in the valve stem, and a sealing gasket elastically contacting the pressure relief passage is installed on the pressure relief rod. When the medium pressure is too high, the sealing gasket can be separated from the pressure relief passage, so that the first passage is communicated with the second passage. After the medium pressure is reduced to a preset value, the sealing gasket resets under the action of elastic force and contacts the pressure relief passage, realizing automatic pressure relief and flow interception;

[0021] 3. Since the pressure adjustment module includes a spring installed in the valve stem, the spring is connected with an adjustment pipe, and a limit knob for fixing the adjustment pipe is installed on the valve stem. Removing the limit knob can replace the adjustment pipe with different lengths, enabling the spring to undergo different degrees of deformation to provide different magnitudes of elastic force to the sealing gasket, thereby realizing the adjustment of the pressure relief threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of the overall structure of an embodiment of the present invention;

[0024] Figure 3 is Figure 2 an enlarged view of part A in

[0025] Figure 4 is a schematic diagram of the valve stem structure of an embodiment of the present invention;

[0026] Figure 5 is a cross-sectional view of the valve stem of an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of the structure of the pressure relief component of an embodiment of the present invention.

[0028] REFERENCE SIGNS:

[0029] 1, valve body; 2, valve stem; 3, sealing block; 4, pressure relief component;

[0030] 11, first passage; 12, second passage;

[0031] 21, bellows; 22, runner; 23, sealing packing layer;

[0032] 31, pressure relief passage;

[0033] 41, pressure relief rod; 42, sealing gasket; 43, pressure adjustment module; 44, sealing ring;

[0034] 431, spring; 432, adjustment pipe; 433, limit knob. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0036] The features and performance of the present utility model will be further described in detail below in conjunction with the embodiments.

[0037] Embodiment:

[0038] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , a self-relieving bellows globe valve, comprising:

[0039] A valve body 1, in which a first channel 11 and a second channel 12 are formed;

[0040] A valve stem 2, installed in the valve body 1, and a bellows 21 is installed on the valve stem 2;

[0041] A sealing block 3, installed on the valve stem 2 and used to separate the first channel 11 and the second channel 12, and a pressure relief channel 31 is formed in the sealing block 3;

[0042] A pressure relief component 4, arranged in the sealing block 3 and used to block the pressure relief channel 31.

[0043] For the existing globe valve, when the medium pressure is too high, it cannot be released. Due to the sealing of the globe valve, the conveying pipe is pressurized, which poses a safety hazard. In this solution, under normal conditions, the pressure relief channel 31 is blocked by the pressure relief component 4. When the medium pressure is too high, the pressure relief component 4 can allow the medium to enter the pressure relief channel 31, and then flow from the first channel 11 into the second channel 12, realizing self-pressure relief and solving the problem that the medium pressure is too high and cannot be released.

[0044] Preferably, in some other embodiments, the sealing block 3 is threadedly connected to the valve stem 2. When this solution is adopted, it is convenient to replace the sealing block 3.

[0045] Preferably, a runner 22 is formed on the valve stem 2, and operating the runner 22 can rotate the valve stem 2 conveniently and quickly.

[0046] Referring to Figure 5 , preferably, a sealing packing layer 23 is further installed on the valve stem 2, and a double-layer seal is formed by the sealing packing layer 23 and the corrugated pipe 21, further improving the sealing reliability.

[0047] Referring to Figure 6 , the specific structure of the pressure relief component 4 is not uniquely defined in this solution. One feasible solution is: the pressure relief component 4 includes a pressure relief rod 41 installed in the valve stem 2, and a sealing gasket 42 elastically contacting the pressure relief channel 31 is installed on the pressure relief rod 41. When this solution is adopted, when the medium pressure is too high, the sealing gasket 42 can be separated from the pressure relief channel 31, so that the first channel 11 is communicated with the second channel 12. After the medium pressure is reduced to a preset value, the sealing gasket 42 is reset under the action of elastic force and contacts the pressure relief channel 31.

[0048] In order to adjust the pressure relief threshold, one feasible solution is: the pressure relief component 4 further includes a pressure adjustment module 43. When this solution is adopted, the pressure relief threshold is adjusted through the soil pressure adjustment module 43.

[0049] The specific structure of the pressure adjustment module 43 is not uniquely defined in this solution. One feasible solution is: the pressure adjustment module 43 includes a spring 431 installed in the valve stem 2. The spring 431 is connected with an adjustment pipe 432, and a limit knob 433 for fixing the adjustment pipe 432 is installed on the valve stem 2. When this solution is adopted, removing the limit knob 433 can replace the adjustment pipe 432 with different lengths, enabling the spring 431 to deform to different degrees, providing different sizes of elastic force to the sealing gasket 42, and thus realizing the adjustment of the pressure relief threshold.

[0050] In order to intuitively reflect the working state of the sealing gasket 42, one feasible solution is: the pressure relief rod 41 penetrates through the limit knob 433 and extends outward. When this solution is adopted, it can be reflected whether the sealing gasket 42 is stationary by observing whether the pressure relief rod 41 is in a stationary state.

[0051] In order to prevent the medium from overflowing from the pressure relief rod 41, one feasible solution is: a sealing ring 44 is installed on the pressure relief rod 41. When this solution is adopted, the sealing ring 44 can prevent the medium from overflowing.

[0052] The working principle of this embodiment:

[0053] The valve stem 2 is rotated by the runner 22 to make the sealing block 3 block the first channel 11 and the second channel 12. When the medium pressure in the first channel 11 is too high, it will overcome the pressure of the spring 431 and push up the sealing gasket 42, and the medium flows into the second channel 12 through the pressure relief channel 31 to achieve pressure relief. When the medium pressure is reduced below the threshold value, the spring 431 pushes the sealing gasket 42 downward and makes the sealing gasket 42 block the pressure relief channel 31.

[0054] To solve the problem that the medium pressure is too high to be released, in this solution, under normal conditions, the pressure relief passage 31 is blocked by the pressure relief component 4. When the medium pressure is too high, the medium can enter the pressure relief passage 31 through the pressure relief component 4, and then flow into the second passage 12 from the first passage 11, realizing self-pressure relief and solving the problem that the medium pressure is too high to be released.

[0055] To achieve automatic pressure relief and interception, in this solution, since the pressure relief component 4 includes a pressure relief rod 41 installed in the valve stem 2, and a gasket 42 elastically contacting the pressure relief passage 31 is installed on the pressure relief rod 41. When the medium pressure is too high, the gasket 42 can be separated from the pressure relief passage 31, and then the first passage 11 is connected to the second passage 12. After the medium pressure drops to a preset value, the gasket 42 resets under the action of elastic force and contacts the pressure relief passage 31, realizing automatic pressure relief and interception.

[0056] To achieve the adjustment of the pressure relief threshold, in this solution, since the pressure adjustment module 43 includes a spring 431 installed in the valve stem 2, the spring 431 is connected with an adjustment pipe 432, and a limit knob 433 for fixing the adjustment pipe 432 is installed on the valve stem 2. Removing the limit knob 433 can replace the adjustment pipe 432 with different lengths, enabling the spring 431 to deform to different degrees, providing different sizes of elastic force to the gasket 42, and thus realizing the adjustment of the pressure relief threshold.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-pressure relief bellows stop valve, characterized in that: include: A valve body (1), wherein a first channel (11) and a second channel (12) are formed in the valve body (1); A valve stem (2) is installed in the valve body (1), and a bellows (21) is installed on the valve stem (2); A sealing block (3) mounted on the valve stem (2) and used to separate the first channel (11) and the second channel (12), wherein a pressure relief channel (31) is formed in the sealing block (3); A pressure relief component (4) is arranged in the sealing block (3) and is used to seal the pressure relief channel (31).

2. A self-pressure relief bellows stop valve according to claim 1, characterized in that: The pressure relief assembly (4) comprises a pressure relief rod (41) installed in the valve stem (2), and a sealing gasket (42) is installed on the pressure relief rod (41) and is in elastic contact with the pressure relief channel (31).

3. A self-pressure relief bellows stop valve according to claim 2, characterized in that: The pressure relief assembly (4) further comprises a pressure regulating module (43).

4. A self-pressure relief bellows stop valve according to claim 3, characterized in that: The pressure regulating module (43) comprises a spring (431) installed in the valve stem (2), the spring (431) being connected to a regulating tube (432), and a limit knob (433) for fixing the regulating tube (432) being installed on the valve stem (2).

5. A self-pressure relief bellows stop valve according to claim 4, characterized in that: The pressure relief rod (41) penetrates the limiting knob (433) and extends outward.

6. A self-pressure relief bellows stop valve according to claim 2, characterized in that: A sealing ring (44) is installed on the pressure relief rod (41).

Images