CN213575693U

CN213575693U - Plug valve for medium and low pressure pipeline

Info

Publication number: CN213575693U
Application number: CN202022466923.XU
Authority: CN
Inventors: 刘永春; 魏明珍; 罗辉; 蔡嵩; 蔡卫红; 常金华; 魏明武
Original assignee: Hubei Quanhuiyou Chemical Machinery Engineering Co ltd
Current assignee: Hubei Quanhuiyou Chemical Machinery Engineering Co ltd
Priority date: 2020-08-31
Filing date: 2020-10-30
Publication date: 2021-06-29
Anticipated expiration: 2030-10-30

Abstract

A plug valve for a medium and low pressure pipeline comprises a seat body and a slide rod arranged at one end in the seat body, wherein a leakage-proof rod is sleeved outside the slide rod; the anti-leakage device is characterized in that the sliding rod is provided with a screw head at the inner end of the seat body, the screw head is provided with a through opening, and an anti-leakage ring is sleeved on the sliding rod between the screw head and the front end of the anti-leakage rod. The utility model has the advantages that, with leak protection pole front end and spiral shell head phase separation when needing to switch, frictional force when having reduced the rotatory switching of slide bar.

Description

Plug valve for medium and low pressure pipeline

Technical Field

The utility model relates to a plug valve, in particular to a plug valve for middle and low pressure pipeline.

Background

The plug valve (metal) PN of B1 grade is less than or equal to 6.4MPa, DN is less than 200mm, -29-180 ℃, the plug valve (metal) PN of B2 grade is less than or equal to 4.0MPa, DN is less than or equal to 400mm, -29-180 ℃, the plug valve in the prior art is matched with the valve rod through the guide sleeve to realize the rotary pressing action of the valve rod and further drive the valve core to rotate, the structure can conveniently realize the state switching of the plug valve, the structure is simple, the cost is low, but because the rotation and the pressing action of the valve rod are carried out simultaneously, the valve core can be driven to rotate together when the valve rod rotates, because the valve core is not completely separated from the inner wall of the valve body, the valve core can generate large friction with the valve body, the driving force can be greatly increased, the valve core can be abraded, the service life of the valve core can be seriously shortened under the long-term use, thereby reducing the service life of the whole plug valve.

Disclosure of Invention

The utility model provides a plug valve for well low pressure pipeline, with leak protection pole front end and spiral shell head phase separation when needing to switch, frictional force when having reduced the rotatory switching of slide bar.

The technical scheme for realizing the aim of the invention is that the plug valve for the medium and low pressure pipeline comprises a seat body and a sliding rod arranged at one end in the seat body, wherein a leakage-proof rod is sleeved outside the sliding rod and is in threaded connection with the surface of the sliding rod, and the surface of a leakage-proof mark is in threaded connection with the inside of the seat body;

the anti-leakage device is characterized in that the sliding rod is provided with a screw head at the inner end of the seat body, the screw head is provided with a through opening, and an anti-leakage ring is sleeved on the sliding rod between the screw head and the front end of the anti-leakage rod.

Preferably, the leakage-proof ring comprises a lower heat-insulating plate in contact with the screw head and an upper heat-insulating plate connected with the front end of the leakage-proof rod, and a rubber layer is filled between the upper heat-insulating plate and the lower heat-insulating plate.

Preferably, the lower end of the leakage-proof rod is provided with a transverse baffle, the upper heat insulation plate is provided with an upward bulge, and the transverse baffle is wrapped by the upper bulge.

Preferably, a temperature-resistant rubber surface layer is arranged on the lower surface of the lower heat insulation plate and the upper surface of the screw head.

The utility model has the advantages that, 1) leak protection pole and slide bar cup joint, and the leak protection pole produces the power pressure through the leak protection ring to the spiral shell head upper surface of slide bar, realizes the effect of low pressure resistant well, makes the valve withstand voltage reach PN and is less than or equal to 6.8 MPa.

2) In the process that the leakage-proof rod generates pressure on the upper surface of the screw head of the sliding rod through the leakage-proof ring, the rubber layer and/or the rubber surface layer deform to fill a gap between the sliding rod and the leakage-proof rod.

3) The sliding rod rotates to enable the penetrating port to be communicated with the pressure pipe or the penetrating port is not communicated with the pressure pipe, and the sliding rod rotates horizontally all the time.

4) The leakage-proof rod rotates to move up and down, so that the leakage-proof ring is pressurized and decompressed.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

As shown in the figure, the seat body 1, the slide rod 2, the leakage-proof rod 3, the screw head 4, the temperature-resistant rubber surface layer 7, the lower heat-insulating plate 61, the upper heat-insulating plate 62 and the rubber layer 63.

Detailed Description

As shown in fig. 1, the plug valve for the medium and low pressure pipeline comprises a seat body 1 and a slide rod 2 arranged at one end in the seat body 1, wherein a leakage-proof rod 3 is sleeved outside the slide rod 2, the outer surface of the slide rod 2 is in threaded connection with the inner surface of the leakage-proof rod 3, the outer surface of the leakage-proof rod 3 is in threaded connection with the inside of the seat body 1, when the slide rod 2 is rotated, the slide rod 2 rotates horizontally, and when the leakage-proof rod 3 is rotated, the leakage-proof rod 3 moves up;

slide bar 2 establish and be equipped with spiral shell head 4 in the pedestal inner, be equipped with on the spiral shell head 4 and wear a mouthful 5, when slide bar 2 is rotatory, spiral shell head 4 also follows rotatoryly, when wearing mouthful and pipeline intercommunication on the spiral shell head 4, realize the valve promptly and open, liquid or gas pass and wear the mouth and flow the plug valve, when wearing mouthful on the spiral shell head 4 not with the pipeline intercommunication, realize the valve promptly and close, liquid or gas can't pass and wear the mouth and flow the plug valve spiral shell head 4 with between 3 front ends of leak protection pole the cover is equipped with the leak protection ring on the slide bar 2, utilizes the clearance between leak protection ring sealed leak protection pole 3 and the slide bar 2, improves plug valve compression rating and increase of service life.

The leakage-proof ring comprises a lower heat-insulating plate 61 contacted with the screw head 4 and an upper heat-insulating plate 62 connected with the front end of the leakage-proof rod 3, a rubber layer 63 is filled between the upper heat-insulating plate 62 and the lower heat-insulating plate 61, the rubber layer 63 needs to have the characteristic of large deformation under certain pressure so as to be capable of fully deforming when being subjected to the pressure of the leakage-proof rod 3 and seal the gap between the leakage-proof rod 3 and the slide rod 2, and under the working environment with the general application temperature of-10 to 180 ℃, if the temperature resistance is required to be lower than-10 ℃, a temperature-resistant rubber surface layer 7 (generally modified nitrile rubber) needs to be arranged on the lower surface of the lower heat-insulating plate 61 and the upper surface of the screw head 4, because the temperature-resistant rubber surface layer 7 can effectively deform and seal the gap between the leakage-proof rod 3 and the slide rod 2 under the condition of-10 to-, therefore, the thickness of the rubber layer 63 can be increased, generally 5 cm, and can be up to 8-10 cm at most according to the use conditions, if the thickness is too thick, the pressure applied by the leakage-proof rod 3 cannot act on the lower heat-insulating plate 61, and the lower surface profile of the lower heat-insulating plate 61 is similar to the upper surface profile of the screw head 4.

Preferably, the lower end of the leakage-proof rod 3 is provided with a transverse baffle, the upper heat-insulating plate 62 is provided with an upward protrusion, as shown in fig. 1, and the transverse baffle is wrapped by the upper protrusion, so that the sealing performance can be improved.

The working principle is as follows: when the plug valve needs to be opened, the leakage-proof rod 3 is rotated firstly to enable the leakage-proof rod not to directly act on the leakage-proof ring 6, the leakage-proof ring 6 reduces the pressure on the sliding rod 2, then the sliding rod 2 is rotated to enable the screw head 4 to rotate, when a through hole in the screw head 4 is communicated with a pipeline, the valve is opened, and liquid or gas passes through the through hole and flows through the plug valve;

when the plug valve needs to be closed, the leakage-proof rod 3 is rotated firstly, when a through hole in the screw head 4 is not communicated with a pipeline, liquid or gas cannot pass through the through hole to flow through the plug valve, then the leakage-proof rod 3 is rotated, and the upper heat insulation plate 62 connected with the front end of the leakage-proof rod 3 applies pressure to the rubber layer 63, the lower heat insulation plate 61 and the temperature-resistant rubber surface layer 7, so that the rubber layer 63 is deformed, the temperature-resistant rubber surface layer 7 is deformed, and the gap between the leakage-proof rod 3 and the sliding rod 2 is sealed, and the pressure-resistant effect of the whole.

Claims

1. The utility model provides a plug valve for well low pressure pipeline which characterized by: the plug valve comprises a seat body and a sliding rod arranged at one end in the seat body, and a leakage-proof rod is sleeved outside the sliding rod;

2. The plug valve for medium and low pressure pipes of claim 1, wherein: the leakage-proof ring comprises a lower heat-insulating plate contacted with the screw head and an upper heat-insulating plate connected with the front end of the leakage-proof rod, and a rubber layer is filled between the upper heat-insulating plate and the lower heat-insulating plate.

3. The plug valve for medium and low pressure pipes of claim 2, wherein: the lower end of the leakage-proof rod is provided with a transverse baffle, the upper heat insulation plate is provided with an upward bulge, and the transverse baffle is wrapped by the upper bulge.

4. The plug valve for medium and low pressure pipes of claim 2, wherein: and a temperature-resistant rubber surface layer is arranged on the lower surface of the lower heat insulation plate and the upper surface of the screw head.