CN212616339U

CN212616339U - Two-way sealing stop valve

Info

Publication number: CN212616339U
Application number: CN202021737056.2U
Authority: CN
Inventors: 叶灵宋; 苏燕玲; 谈卓雅
Original assignee: Shanghai Automation Instrumentation Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd; Shanghai Automation Instrumentation Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-02-26
Anticipated expiration: 2030-08-19

Abstract

The utility model discloses a two-way seal stop valve, wherein, include: a sleeve is arranged in the valve seat, a main valve flap and a main valve flap nut are arranged in the sleeve, the main valve flap nut is arranged on the main valve flap, and a cavity is formed between the main valve flap nut and the main valve flap; a first flow through hole communicates through the lower portion of the cavity; the second flow through hole penetrates through the side wall of the valve clack, and the outlet is communicated with the bottom of the cavity; a pilot valve clack is arranged in the cavity; the pilot valve clack is arranged above the outlet of the second through hole; the upper surface of the pilot valve clack is provided with a columnar recess, and a disc is rotatably arranged in the columnar recess; a pilot valve clack nut is arranged in the columnar recess above the disc; the valve rod penetrates through the valve seat, the pilot valve clack nut and is fixed with the disc. The utility model discloses a two way seal requirement when two kinds of different work condition switch is realized to the structure.

Description

Two-way sealing stop valve

Technical Field

The utility model relates to a valve especially relates to a two-way seal stop valve.

Background

The shut-off valve is a positive seal type valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface from leaking. When the medium enters the valve from the lower part of the valve clack, the resistance to be overcome by the operating force is the friction force between the valve rod and the packing and the thrust generated by the pressure of the medium, the force for closing the valve is larger than the force for opening the valve, so the diameter of the valve rod is larger, otherwise the failure of the valve rod buckling can occur. In recent years, after self-sealing valves appear, the medium flow direction of the stop valve enters the valve cavity from the upper part of the valve clack instead, and at the moment, the force for closing the valve is small under the action of medium pressure, while the force for opening the valve is large, and the diameter of the valve rod can be correspondingly reduced. At the same time, this type of valve is also relatively tight under the action of the medium.

At present, the design of domestic hard seal stop valves comprises specifications of various calibers, the hard seal requirement of high temperature and high pressure difference is realized, but the special requirements of the existing industry, particularly the special requirements of the nuclear-grade valves on large pressure difference change (such as 0.5-2 MPa and 15-20 MPa) borne by sealing and opposite action can not be met.

Therefore, the utility model aims to provide a valve internal part structure of a stop valve capable of realizing bidirectional high pressure difference sealing, which adopts a B-end sleeve pressure balance type hard sealing structure of the stop valve and utilizes the stress of a valve rod of the B-end pressure balance part to ensure that the thrust of the valve rod is minimum when the valve reaches the necessary sealing specific pressure; meanwhile, when the inlet pressure is zero and the end B keeps high pressure, the sealing surface self-pressing force can also meet the high sealing requirement, and the valve clack opening force is large, so that the pressure balance hole is opened in a pilot mode reasonably, pressure difference is released and balanced, valve rod pulling force for opening the valve is reduced, flow resistance is reduced, and the flow area is enlarged.

SUMMERY OF THE UTILITY MODEL

The above object of the present invention is achieved by the following technical solutions:

a double seal shut-off valve comprising: a sleeve is arranged in the valve seat, a main valve flap and a main valve flap nut are arranged in the sleeve, the main valve flap nut is arranged on the main valve flap, and a cavity is formed between the main valve flap nut and the main valve flap; a first flow through hole communicates through the lower portion of the cavity; the second flow through hole penetrates through the side wall of the valve clack, and the outlet is communicated with the bottom of the cavity; a pilot valve clack is arranged in the cavity; the pilot valve clack is arranged above the outlet of the second through hole; the upper surface of the pilot valve clack is provided with a columnar recess, and a disc is rotatably arranged in the columnar recess; a pilot valve clack nut is arranged in the columnar recess above the disc; the valve rod penetrates through the valve seat, the pilot valve clack nut and is fixed with the disc.

The bidirectional sealing stop valve is characterized in that the sleeve is provided with a first round hole corresponding to the inlet of the second through hole; the valve seat is provided with a first channel and a second channel, and the first channel is communicated with the first round hole; the second channel is communicated with the lower opening of the sleeve.

The bidirectional sealing stop valve as described above, wherein an annular groove is disposed between the upper surface and the outer side of the main valve flap, a sealing ring is mounted in the annular groove, and the upper wall of the sealing ring is tightly attached to the main valve flap nut.

The two-way sealing stop valve is characterized in that the upper surface of the pilot valve clack is provided with an antifriction pad.

The two-way sealing stop valve is characterized in that a plurality of buffer springs are further arranged in the cavity, and the buffer springs are connected between the pilot valve clack and the main valve clack.

The bidirectional sealing stop valve as described above, wherein the sleeve comprises an upper section and a lower section, the lower section has a smaller diameter than the upper section, and a connecting part between the upper section and the lower section has a slope; the lower part of the main valve flap is matched with the lower section; the upper part of the main valve flap is matched with the upper part section, and the middle part of the main valve flap is provided with an inclined plane matched with the inclined plane of the connecting part.

The bidirectional sealing stop valve is characterized in that the lower end surface of the sleeve abuts against the lower end surface of the sleeve to form a first sealing surface.

The bidirectional sealing stop valve is characterized in that the sleeve is further provided with a second round hole, and a side cavity communicated with the second round hole is formed in the sleeve.

To sum up, owing to adopted above-mentioned technical scheme, the utility model discloses install the sleeve in the disk seat, first passageway, second passageway have in the disk seat, installation main valve lamella and main valve lamella nut in the sleeve to set up the pilot valve clack in the cavity that the two formed, make rotatory screw rod in-process, the pilot valve clack can at first rise, and the second flow hole is opened, and fluid entering passageway balances the pressure differential of first passageway, second passageway in the valve body cavity, reduces the opening force of valve rod. The structure of the utility model ensures that the thrust of the bidirectional sealing valve rod at the closing position is minimum; meanwhile, the pilot-operated valve clack is additionally opened, so that the problem that the pull force of a valve rod is minimum when the valve is opened is solved; the two-way sealing requirement is met when two different working conditions are switched.

Drawings

FIG. 1 is a schematic structural view of the two-way sealing stop valve of the present invention;

fig. 2 is a partial enlarged view of the part C of the bidirectional sealing stop valve of the present invention.

Detailed Description

The invention will be further described with reference to the following figures and examples:

fig. 1 is the structure schematic diagram of the two-way sealing stop valve of the present invention, fig. 2 is the partial enlarged view of the part C of the two-way sealing stop valve, please refer to fig. 1 and fig. 2, a two-way sealing stop valve, wherein, include: a sleeve 1 is arranged in the valve seat 3, a main valve flap 2 and a main valve flap nut 8 are arranged in the sleeve 1, the main valve flap nut 8 is arranged on the main valve flap 2, and a cavity is arranged between the main valve flap nut 8 and the main valve flap 2; the first flow through hole 4 is communicated with the lower part of the cavity; the second flow through hole 5 passes through the side wall of the valve clack and then the outlet is communicated with the bottom of the cavity; a pilot valve clack 6 is arranged in the cavity; the pilot valve flap 6 is arranged above the outlet of the second flow through hole 5; the upper surface of the pilot valve clack 6 is provided with a columnar recess, and a disc is rotatably arranged in the columnar recess; a pilot valve clack nut 11 is arranged in the columnar recess above the disc; the valve rod 10 passes through the valve seat 3 and the pilot valve clack nut 11 to be fixed with the disc. In the opening process, the valve rod 10 rises in the rotating process to drive the disc to rise, the disc drives the pilot valve clack 6 to rise, the lower part of the pilot valve clack 6 is released from contact with the outlet of the second through hole 5, the valve rod 10 continues to rotate, the pilot valve clack 6 rises, the pilot valve clack nut 11 abuts against the main valve clack nut 8 above the pilot valve clack nut, and the main valve clack 2 is driven to rise. The utility model discloses a set up pilot valve clack 6, make earlier fluid get into the lumen (the main valve lamella nut 8 top is the lumen) fluid pressure tend to balance promptly, open main valve lamella 2 completely again to it is easy to make the valve open, reduces the valve rod 10 pulling force that the valve opened.

Further, a first round hole is formed in the position, corresponding to the inlet of the second flow through hole 5, of the sleeve 1; the valve seat 3 is provided with a first channel (end B) and a second channel (end A), and the first channel is communicated with the first round hole; the second passage communicates with the lower opening of the sleeve 1.

Specifically, the end B in fig. 1 is in the first flow passage and the end a is in the second flow passage. A middle cavity is arranged between the upper part of the main valve flap nut 8 and the sleeve 1. The first flow through hole 4 is communicated with the end B and the middle cavity to realize the pressure balance between the middle cavity and the end B

Furthermore, an annular clamping groove is formed between the upper surface and the outer side edge of the main valve flap 2, a sealing ring 9 is installed in the annular clamping groove, and the upper wall of the sealing ring 9 is tightly attached to the main valve flap nut 8. The sealing ring 9 can be made of the following materials, for example: o-rings, packing, etc.

Further, an antifriction pad 7 is arranged on the upper surface of the pilot valve clack 6. The friction reducing pad 7 is arranged at the bottom of the cylindrical recess so that friction between the disc and the pilot flap 6 can be reduced. The wear reduction pad 7 may be ring-shaped, and the outlet of the second flow hole 5 may be provided at a position where the wear reduction pad 7 is hollow. The two do not influence each other.

Furthermore, a plurality of buffer springs 12 are arranged in the cavity, and the buffer springs 12 are connected between the pilot valve clack 6 and the main valve clack 2. The utility model discloses be equipped with buffer spring 12 between main valve lamella 2 and guide's valve lamella 6, when guide's valve lamella 6 closes, play the cushioning effect.

Further, the sleeve 1 comprises an upper section and a lower section, wherein the diameter of the lower section is smaller than that of the upper section; the lower part of the main valve flap 2 is matched with the lower section; the upper part of the main valve flap 2 is matched with the upper section. Connecting portion have the inclined plane between upper portion section and the lower part section, and what match at 2 middle parts of main valve lamella has an inclined plane, and two inclined planes set up relatively the utility model discloses a when the stop valve was closed, the inclined plane of sleeve 1 was hugged closely with the inclined plane of main valve lamella 2 and is formed the sealed face 22 of second.

Further, the utility model discloses a when the stop valve was closed, offset between terminal surface and the sleeve 1 under the sleeve 1 and form first sealed face 21.

The utility model discloses a set up disk seat 3 to with the setting of first sealed face on disk seat 3, when the fluid erodees for a long time in the valve or cavitation results in the sealed face inefficacy of first way, can prolong the life of whole stop valve through changing disk seat 3.

The utility model discloses a sealed face of face 21, the sealed face 22 of second forms the combination seal for sealing reliability is higher.

By arranging the valve seat 3 and arranging the first sealing surface 21 on the valve seat 3, when the first sealing surface 21 fails due to long-term flushing or cavitation of fluid in the valve, the service life of the whole stop valve can be prolonged by replacing the valve seat 3.

Further, a second round hole is formed in the sleeve 1, and a side cavity communicated with the second round hole is formed in the sleeve 1.

The utility model discloses an among the concrete implementation process, the utility model discloses a concrete operation mode can be for:

when the stop valve is closed, fluid at the end B reaches a middle cavity of the valve body through the first flow through hole 4 on the main valve flap 2, so that the thrust of the valve rod 10 is minimum when the valve reaches the necessary sealing specific pressure by utilizing the stress of the valve rod 10 of the pressure balancing part; meanwhile, when the pressure at the end A is zero and the end B keeps high pressure, the self-pressing force of the sealing surface can also meet the high sealing requirement. When the valve needs to be opened, the valve rod 10 drives the pilot valve clack nut 11, the pilot valve clack 6 is in threaded connection with the pilot valve clack nut 11, the pilot valve clack 6 is separated from the main valve clack 2, the second flow through hole 5 in the main valve clack 2 is opened, at the moment, fluid enters the valve middle cavity through the second flow through hole 5, the pressure difference of the valve inlet end B is discharged and balanced, at the moment, the valve rod 10 is lifted again, the pilot valve clack nut 11 drives the main valve clack nut 8 and the main valve clack 2 to move upwards together, the main valve clack 2 is completely opened, in the embodiment, the pilot valve clack 6 is arranged, namely, the fluid pressure of the fluid entering the middle cavity tends to be balanced, and then the main valve clack 2 is completely opened.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised in accordance with the principles of the present invention by those skilled in the art without the use of inventive faculty, or through software programming. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A bi-directional seal shut-off valve, comprising: a sleeve is arranged in the valve seat, a main valve flap and a main valve flap nut are arranged in the sleeve, the main valve flap nut is arranged on the main valve flap, and a cavity is formed between the main valve flap nut and the main valve flap; a first flow through hole communicates through the lower portion of the cavity; the second flow through hole penetrates through the side wall of the valve clack, and the outlet is communicated with the bottom of the cavity; a pilot valve clack is arranged in the cavity; the pilot valve clack is arranged above the outlet of the second through hole; the upper surface of the pilot valve clack is provided with a columnar recess, and a disc is rotatably arranged in the columnar recess; a pilot valve clack nut is arranged in the columnar recess above the disc; the valve rod penetrates through the valve seat, the pilot valve clack nut and is fixed with the disc.

2. The bidirectional sealing stop valve of claim 1, wherein the sleeve is provided with a first round hole at a position corresponding to the inlet of the second through-flow hole; the valve seat is provided with a first channel and a second channel, and the first channel is communicated with the first round hole; the second channel is communicated with the lower opening of the sleeve.

3. The bidirectional sealing stop valve of claim 1, wherein an annular groove is formed between the upper surface and the outer side edge of the main valve flap, a sealing ring is installed in the annular groove, and the upper wall of the sealing ring is tightly attached to the main valve flap nut.

4. The bi-directional sealing shut-off valve of claim 1, wherein an anti-friction pad is mounted on an upper surface of the pilot flap.

5. The bi-directional sealing stop valve of claim 1, further comprising a plurality of cushioning springs disposed within the cavity, the cushioning springs being connected between the pilot flap and the main valve flap.

6. The bi-directional sealing shut-off valve of claim 1, wherein the sleeve comprises an upper section, a lower section, the lower section being smaller in diameter than the upper section, a connection between the upper section and the lower section having a bevel; the lower part of the main valve flap is matched with the lower section; the upper part of the main valve flap is matched with the upper part section, and the middle part of the main valve flap is provided with an inclined plane matched with the inclined plane of the connecting part.

7. The bi-directional seal stop valve of claim 1, wherein a first sealing surface is formed between the lower end surface of the sleeve and the sleeve.

8. The bidirectional sealing stop valve of claim 1, wherein the sleeve further defines a second circular aperture, and the sleeve has a side cavity therein communicating with the second circular aperture.