CN219317673U

CN219317673U - Two-piece cast steel fixed ball valve

Info

Publication number: CN219317673U
Application number: CN202223527471.7U
Authority: CN
Inventors: 刘凯; 赵越
Original assignee: SUZHOU SIP STARD VALVE CO Ltd
Current assignee: SUZHOU SIP STARD VALVE CO Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-07-07
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses a two-piece cast steel fixed ball valve which comprises an upper sealing area and a lower sealing area. The upper sealing area comprises a stuffing box, a stuffing groove which is spliced with a pressing sleeve is formed in the top of the stuffing box, the top end of the pressing sleeve extends to the inner side of the support, a pressing plate is arranged at the top of the pressing sleeve, and combined stuffing which is in contact with the valve rod is filled in the stuffing groove; the lower sealing area comprises a valve cover and metal valve seats on the inner sides of the valve body, wherein two metal valve seats are respectively positioned on two sides of the ball body, three annular grooves are formed in the surface of the valve cover, and carbon fiber woven packing, a second O-shaped ring and a third O-shaped ring are sequentially arranged in the three annular grooves. According to the utility model, the valve rod low-leakage combined packing is arranged between the valve rod and the packing box, and the sealing effect is realized through the sustainable stress application of the pressing sleeve, the pressing plate, the disc spring, the third gasket, the second stud and the second nut, so that the leakage of a medium is avoided.

Description

Two-piece cast steel fixed ball valve

Technical Field

The utility model relates to the technical field of ball valves, in particular to a two-piece cast steel fixed ball valve.

Background

With the gradual increase of petroleum exploitation and export quantity, the market demand for valves is also increased, which becomes a new growth point of valve markets. However, the conventional valve stem sealing structure is gradually unable to meet the valve market, and the following disadvantages generally exist:

(1) The valve has poor sealing performance and high leakage rate;

(2) When encountering fire, the internal sealing ring is easy to damage, thereby causing leakage;

(3) When the valve is opened and closed, the condition that the inflammable medium is ignited by electrostatic ignition can occur, so that the integral safe operation of the valve is influenced.

Disclosure of Invention

In order to solve the problems, the utility model provides a two-piece cast steel fixed ball valve.

The main content of the utility model comprises:

a two-piece cast steel fixed ball valve comprises an upper sealing area and a lower sealing area. The upper sealing area comprises a stuffing box, a stuffing groove which is spliced with a pressing sleeve is formed in the top of the stuffing box, the top end of the pressing sleeve extends to the inner side of the support, a pressing plate is arranged at the top of the pressing sleeve, combined stuffing which is in contact with a valve rod is filled in the stuffing groove, the combined stuffing comprises an upper stuffing, a middle stuffing and a lower stuffing which are stacked in sequence, and the pressing sleeve and the stuffing groove are both positioned on the outer surface of the valve rod. The lower sealing area comprises a valve cover and metal valve seats on the inner sides of a valve body, the two metal valve seats are respectively located on two sides of a ball body, an O-shaped ring is arranged at the joint of the valve cover and the valve body, three annular grooves are formed in the surface of the valve cover, carbon fiber woven fillers, two O-shaped rings and three O-shaped rings are sequentially arranged in the annular grooves, a valve seat spring is arranged at the upper end of the metal valve seat, and a soft valve seat is arranged at the joint of the metal valve seat and the ball body.

Preferably, the bottom of the inner cavity of the bracket is fixedly connected with a second stud, the top end of the second stud penetrates through the pressing plate, and a disc spring, a third gasket and a second nut are sequentially arranged at the top of the pressing plate.

Preferably, the lower end of the stuffing box extends to a position between the valve rod and the valve body, and the valve rod is connected with the valve body through a second bearing.

Preferably, the lower end of the valve rod is embedded into a crescent groove at the top of the sphere, an anti-static cavity is formed in a central inward groove at the lower end of the valve rod, an anti-static spring is arranged in the anti-static cavity, a second anti-static groove is formed in the middle end of the valve rod, a second anti-static spring and an anti-static ball are arranged in the second anti-static groove, and the anti-static ball is in butt joint with the inner wall of the stuffing box.

Preferably, the valve further comprises a protection area, the top and the bottom of the valve body are provided with supporting plates, and a first bearing and a first gasket are sequentially arranged at the joint of the supporting plates and the valve body.

Preferably, a valve middle cavity is arranged between the valve body and the valve cover connection part, and a sphere is arranged in the valve middle cavity.

Preferably, three sealing ring grooves are formed between the valve rod and the stuffing box, and a number five O-shaped ring can be arranged in each of the three sealing ring grooves.

Preferably, the valve rod is of a step structure design, the valve rod is connected with the gear box through a flat key, the valve cover and the valve body are made of cast steel, and the valve cover is connected with a first nut and a first stud of a valve body sleeve.

Preferably, the stuffing box is connected with the valve body through a first screw, a fourth O-shaped ring is arranged at the joint of the stuffing box and the valve body, the stuffing box is connected with the bracket through a second screw, and the top of the inner cavity of the bracket is connected with the gear box through a third stud and a third nut.

The utility model provides a two-piece cast steel fixed ball valve, which has the beneficial effects that:

(1) The valve rod low-leakage combined packing is arranged between the valve rod and the packing box, and sustainable stress application is realized through the pressing sleeve, the pressing plate, the disc spring, the second stud of the third gasket and the second nut, so that sealing effect is realized, and leakage of a medium is avoided.

(2) Two O-shaped rings and a carbon fiber woven filler structure are arranged at the valve cover and the metal valve seat, so that the sealing effect can be realized when a fire disaster occurs, and the leakage of a medium is avoided.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is an enlarged view of a portion of the present utility model at a.

The components in the drawings are marked as follows: 1-valve body, 10-hanging ring, 11-first nut, 12-first stud, 13-first screw, 14-second screw, 15-first O-ring, 16-second O-ring, 17-third O-ring, 18-fourth O-ring, 19-fifth O-ring, 2-valve cover, 21-carbon fiber woven filler, 22-graphite gasket, 23-first gasket, 24-second gasket, 25-first bearing, 26-second bearing, 27-valve seat spring, 28-first antistatic spring, 29-second antistatic spring, 3-ball, 31-flat key, 32-blow-off cock, 33-upper filler, 34-middle filler, 35-lower filler, 4-valve rod, 40-press sleeve, 41-press plate, 42-disc spring, 43-third gasket, 44-second stud, 45-second nut, 46-gear box, 47-third stud, 48-third nut, 5-support plate, 6-soft box, 7-support, 8-metal valve seat, 9-valve seat.

Detailed Description

The technical scheme protected by the utility model is specifically described below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present utility model provides a two-piece cast steel fixed ball valve, which comprises an upper sealing area and a lower sealing area; the upper sealing area comprises a stuffing box 6, a stuffing groove which is spliced with a pressing sleeve 40 is formed in the top of the stuffing box 6, the top end of the pressing sleeve 40 extends to the inner side of a support 7, a pressing plate 41 is arranged at the top of the pressing sleeve 40, combined stuffing which is in contact with a valve rod is filled in the stuffing groove, the combined stuffing comprises an upper stuffing 33, a middle stuffing 34 and a lower stuffing 35 which are stacked in sequence, and the pressing sleeve 40 and the stuffing groove are both positioned on the outer surface of the valve rod; the lower sealing area comprises a valve cover 2 and a metal valve seat 8 on the inner side of a valve body 1, wherein two metal valve seats 8 are respectively arranged on two sides of a ball body 3, a first O-shaped ring 15 is arranged at the joint of the valve cover 2 and the valve body 1, three annular grooves are formed in the surface of the valve cover 2, carbon fiber woven packing 21, a second O-shaped ring 16 and a third O-shaped ring 17 are sequentially arranged in the annular grooves, when a fire disaster happens, the carbon fiber woven packing 21 can play a role in avoiding leakage of media under the condition that the second O-shaped ring 16 and the third O-shaped ring 17 fail, a valve seat spring 27 is arranged at the upper end of the metal valve seat 8, a soft valve seat 9 is arranged at the joint of the metal valve seat 8 and the ball body 3, a valve seat spring 27 compensation structure is adopted, initial pre-tight sealing specific pressure is provided through the valve seat spring 27, when the fire disaster happens, the soft valve seat 9 fails, the metal surfaces of the ball valve 3 and the metal valve seat 8 are in contact, the sealing effect is realized, and leakage of the media is avoided.

The bottom of the inner cavity of the bracket 7 is fixedly connected with a second stud 44, the top end of the second stud 44 penetrates through the pressing plate 41, and a disc spring 42, a third gasket 43 and a second nut 45 are sequentially arranged at the top of the pressing plate 41. The lower end of the stuffing box 6 extends to a position between the valve rod and the valve body 1, and the valve rod is connected with the valve body 1 through a second bearing 26. The valve rod lower extreme embedding spheroid 3 top crescent, valve rod lower extreme central authorities are inwards fluted and are set up antistatic cavity No. one, antistatic cavity inside is set up antistatic spring 28 No. one, the valve rod middle-end sets up antistatic groove No. two, antistatic inslot portion is set up antistatic spring 29 No. two and antistatic ball, antistatic with stuffing box 6 inner wall butt. Still include the guard area, valve body 1 top and bottom all set up backup pad 5, backup pad 5 with valve body 1 junction sets gradually bearing 25 and gasket 23 No. one, can reduce the friction torque of valve rod 4 and backup pad 5, makes valve rod long-term operation steady nimble, pure torque operation improves the life of valve.

Further, a valve middle cavity is arranged between the valve body 1 and the joint of the valve cover 2, a ball body 3 is arranged in the valve middle cavity, the valve middle cavity adopts an automatic pressure relief design, and when the pressure of the middle cavity is abnormally increased due to vaporization of liquid medium which is retained in the valve middle cavity due to temperature increase, the medium in the middle cavity can push a metal valve seat 8 to automatically relieve pressure by means of the acting force of the medium, so that the safety of the valve and a production pipeline is ensured. Three sealing ring grooves are formed between the valve rod and the stuffing box 6, and a number five O-shaped ring 19 can be arranged in each of the three sealing ring grooves.

In one embodiment, the valve rod is of a step structure design, the valve rod is connected with the gear box 46 through the flat key 31, the valve cover 2 and the valve body 1 are made of cast steel, and the valve cover 2 and the valve body 1 are connected through a first nut 11 and a first stud 12. The stuffing box 6 is connected with the valve body 1 through a first screw 13, a fourth O-shaped ring 18 is arranged at the joint of the stuffing box 6 and the valve body 1, the stuffing box 6 is connected with the support 7 through a second screw 14, the top of an inner cavity of the support 7 is connected with the gear box 46 through a third stud 47 and a third nut 48, and the valve rod 4 with the ladder structure design can play a role in preventing blowout under the positioning of the stuffing box 6, and can be easily operated by a single person through torque conversion of the gear box 46.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A two piece cast steel fixed ball valve, comprising:

the upper sealing area comprises a stuffing box, a stuffing groove which is spliced with a pressing sleeve is arranged at the top of the stuffing box, the top end of the pressing sleeve extends to the inner side of the support, a pressing plate is arranged at the top of the pressing sleeve, combined stuffing which is in contact with a valve rod is filled in the stuffing groove, the combined stuffing comprises an upper stuffing, a middle stuffing and a lower stuffing which are stacked in sequence, and the pressing sleeve and the stuffing groove are both positioned on the outer surface of the valve rod;

the lower sealing area comprises a valve cover and metal valve seats on the inner sides of the valve body, wherein two metal valve seats are respectively arranged on two sides of a ball body, an O-shaped ring is arranged at the joint of the valve cover and the valve body, three annular grooves are formed in the surface of the valve cover, carbon fiber woven fillers, a second O-shaped ring and a third O-shaped ring are sequentially arranged in the annular grooves, valve seat springs are arranged at the upper ends of the metal valve seats, and soft valve seats are arranged at the joint of the metal valve seats and the ball body.

2. The two-piece cast steel fixed ball valve according to claim 1, wherein the bottom of the inner cavity of the support is fixedly connected with a second stud, the top end of the second stud penetrates through the pressing plate, and a disc spring, a third gasket and a second nut are sequentially arranged on the top of the pressing plate.

3. The two-piece cast steel fixed ball valve of claim 1, wherein the lower end of the stuffing box extends between a valve rod and the valve body, and the valve rod is connected with the valve body through a second bearing.

4. The two-piece cast steel fixed ball valve according to claim 3, wherein the lower end of the valve rod is embedded into a crescent groove at the top of the sphere, a first antistatic cavity is formed in the central inner groove at the lower end of the valve rod, a first antistatic spring is arranged in the first antistatic cavity, a second antistatic groove is formed in the middle end of the valve rod, a second antistatic spring and an antistatic small ball are arranged in the second antistatic groove, and the antistatic is in butt joint with the inner wall of the stuffing box.

5. The two-piece cast steel fixed ball valve according to claim 4, further comprising a protection area, wherein the top and the bottom of the valve body are provided with support plates, and a first bearing and a first gasket are sequentially arranged at the joint of the support plates and the valve body.

6. A two piece cast steel fixed ball valve as claimed in claim 3 wherein a valve cavity is provided between said valve body and said valve cover, and a ball is provided within said valve cavity.

7. The two-piece cast steel fixed ball valve according to claim 3, wherein three sealing ring grooves are formed between the valve rod and the stuffing box, and a five-number O-shaped ring can be arranged in each of the three sealing ring grooves.

8. The two-piece cast steel fixed ball valve according to claim 4, wherein the valve rod is of a stepped structure design, the valve rod is connected with the gear box through a flat key, the valve cover and the valve body are made of cast steel, and the valve cover is connected with a first nut and a first stud of a valve body sleeve.

9. The two-piece cast steel fixed ball valve according to claim 1, wherein the stuffing box is connected with the valve body through a first screw, a fourth O-shaped ring is arranged at the joint of the stuffing box and the valve body, the stuffing box is connected with the bracket through a second screw, and the top of the inner cavity of the bracket is connected with the gear box through a third stud and a third nut.