CN214368131U

CN214368131U - Antiscour zero-leakage plunger stop valve

Info

Publication number: CN214368131U
Application number: CN202120386383.6U
Authority: CN
Inventors: 许开化; 胡鹏程; 陈振兴; 胡隆峰
Original assignee: Koflow Valve Group Co ltd
Current assignee: Koflow Valve Group Co ltd
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-10-08
Anticipated expiration: 2031-02-22

Abstract

The utility model relates to an anti-scouring zero-leakage plunger type stop valve, which comprises a valve body, a valve rod, a plunger body and a hand wheel, wherein an outlet channel of the valve body is concentric with the valve rod and the plunger body, and an inlet channel is positioned on the side wall of a cylindrical valve cavity; the method is characterized in that: the plunger piston body is in movable sealing fit with the port sleeve, so that the sealing contact area of the plunger piston body is reduced, and the opening and closing torque is reduced; the lower end face of the plunger piston body is provided with a lower blind hole, an inlet channel medium is directly communicated with the flow channel outlet channel through the lower blind hole, the medium does not erode the inner wall of the through-hole sleeve, and the sealing performance of the sealing pair and the service life of the product are improved; the upper end of the plunger piston body is provided with an upper blind hole, and the lower end of the valve rod enters the upper blind hole when the plunger piston is opened, so that the function of a non-rising stem valve is realized. The valve has the advantages of small opening and closing moment, good anti-scouring performance, high sealing reliability, long service life, small installation space and the like.

Description

Antiscour zero-leakage plunger stop valve

Technical Field

The utility model belongs to the valve field, in particular to plunger type stop valve. The invention is especially suitable for the control valve of the high-pressure crude oil medium of the oil production well in the petroleum industry.

Background

The plunger valve has the function of a stop valve, and mainly structurally comprises a valve body, a plunger, a valve rod and a hand wheel, wherein a sealing sleeve which is in movable sealing fit with the outer cylindrical surface of the plunger is arranged in an inner cavity between an inlet and an outlet of the valve body, the end part of the plunger is connected with one end of the valve rod, and the hand wheel drives the plunger to move axially through the valve rod when rotating to realize opening and closing. However, existing spool valves suffer from at least the following disadvantages: firstly, the outer circle surface of the plunger piston is matched with the inner wall of the sealing sleeve in a dynamic sealing manner to realize sealing, and the plunger piston and the sealing sleeve have larger friction force during opening and closing and large opening and closing torque; secondly, the medium directly impacts the inner wall of the sealing sleeve in the opening state to generate larger scouring on the inner wall of the sealing sleeve, and particularly, at the moment of opening and closing the plunger, high-speed fluid generates large scouring force, so that the sealing sleeve is easily damaged, and the sealing performance and the service life are influenced; thirdly, the valve rod and the plunger piston lift together when opening and closing, and the installation space is large.

Disclosure of Invention

The utility model discloses to the shortcoming that prior art exists, provide an antiscour zero leakage plunger type stop valve that opening and close moment is little, sealing performance is reliable, long service life, installation space are little.

The technical scheme of the utility model includes valve body, valve rod, plunger body, hand wheel, the valve body has inlet channel and outlet channel communicated with the cylindrical valve cavity, one end of the valve rod is fixedly connected with the hand wheel, the other end is connected with the upper end of the plunger body, the outlet channel is concentric with the valve rod and the plunger body, the inlet channel is positioned on the side wall of the cylindrical valve cavity; the method is characterized in that: the valve cavity at the inlet passage of the valve body is internally provided with a port sleeve, the port sleeve is provided with a through hole communicated with the inlet passage, the diameter of the through hole is larger than that of the inlet passage, the upper end surface and the lower end surface of the port sleeve are respectively provided with an upper filler and a lower filler, the outer circular surface of the port sleeve is in dynamic sealing connection with the inner wall of the valve cavity, the inner hole wall is in dynamic sealing fit with the outer circular surface of the plunger body, and the outer circular surface of the port sleeve and the inner wall of the valve cavity are provided with an anti-rotation device; the lower end face of the plunger body is provided with a lower blind hole, the side wall of the lower blind hole is provided with a radial hole communicated with the outer circular surface of the plunger body, and the radial hole is concentric with the inlet channel in the fully-opened state of the plunger body; the upper end face of the plunger body is provided with an upper blind hole concentric with the valve rod, the upper port of the upper blind hole is fixedly connected with a valve rod nut in threaded fit connection with the lower end of the valve rod, the upper end of the valve rod is axially positioned and installed in the support mounting hole by an upper bearing and a lower bearing, and an axial guide device is arranged between the outer circular surface of the upper end of the plunger body and the guide column of the support.

In the technical scheme, the inner hole of the through hole sleeve is provided with an upper sealing ring and a lower sealing ring which are in dynamic sealing fit with the outer circular surface of the plunger body.

In the above technical solution, the axial length of the lower blind hole at the lower side of the center line of the radial hole is at least equal to the distance from the center line of the inlet channel to the lower end of the lower packing.

In the technical scheme, the through-hole sleeve and the plunger body are made of ceramic materials, the valve rod nut is sintered in the upper blind hole of the plunger body, and an axial guide device is arranged between the valve rod nut and the guide column of the support.

In the technical scheme, the upper filler is arranged in the filler cavity between the upper end surface of the port sleeve and the inner wall of the valve cavity as well as between the upper end surface of the port sleeve and the outer circular surface of the plunger body through the automatic spring compensation device.

Compared with the prior art, the utility model beneficial effect be: the plunger piston body is in dynamic sealing fit with the through hole sleeve, so that the sealing contact area of the plunger piston body is reduced, and the opening and closing torque is reduced; the lower end face of the plunger piston body is provided with a lower blind hole, an inlet channel medium is directly communicated with the flow channel outlet channel through the lower blind hole, the medium does not erode the inner wall of the through-hole sleeve, and the sealing performance of the sealing pair and the service life of the product are improved; the upper end of the plunger piston body is provided with an upper blind hole, and the lower end of the valve rod enters the upper blind hole when the plunger piston is opened, so that the function of a non-rising stem valve is realized. The valve has the advantages of small opening and closing moment, good anti-scouring performance, high sealing reliability, long service life, small installation space and the like.

Drawings

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

Fig. 2 is a schematic structural view of the port cover of fig. 1 according to the present invention.

The valve comprises a valve body 1, a through hole sleeve 2, a plunger piston body 3, a packing pressing sleeve 4, a packing pressing plate 5, a valve rod nut 6, a guide column 7, a spring 8, a vertical column 9, a valve rod 10, a hand wheel 11, a bracket 12, an upper packing 13, an upper blind hole 14, an inlet channel 15, a through hole 16, a lower packing 17, a radial hole 18, a lower blind hole 19 and an outlet channel 20.

Detailed Description

The anti-scouring zero-leakage plunger type stop valve shown in fig. 1 comprises a valve body 1, a valve rod 10, a plunger body 3 and a hand wheel 11, wherein the valve body 1 is provided with an inlet channel 15 and an outlet channel 20 which are communicated with a cylindrical valve cavity, the upper end of the valve rod 10 is fixedly connected with the hand wheel 11, the outlet channel 20 is concentric with the valve rod 10 and the plunger body 3, the inlet channel 15 is positioned on the side wall of the cylindrical valve cavity, the inlet channel 15 is vertical to the outlet channel 20, and an acute angle or an obtuse angle can be formed between the central lines of the inlet channel 15 and the outlet channel 20; the method is characterized in that: the valve cavity at the position of the inlet passage 15 is internally provided with a through hole sleeve 2, the side wall of the through hole sleeve 2 is provided with a through hole 16 for communicating an inner hole of the through hole sleeve with the inlet passage 15, the diameter of the through hole 16 is at least equal to that of the inlet passage 15, the diameter of the through hole 16 is larger than that of the inlet passage 15 in the embodiment, the blocking of a medium when the medium passes through the through hole 16 is avoided, the upper end surface and the lower end surface of the through hole sleeve 2 are respectively provided with an upper filler 13 and a lower filler 17, the upper filler 13 and the lower filler 17 respectively form a middle cavity and an inlet and outlet double seal with the through hole sleeve 2, the outer circular surface of the through hole sleeve 2 is connected with the inner circular surface of the valve cavity in a dynamic sealing way, the inner hole wall is matched with the outer circular surface of the plunger body 3 in a dynamic sealing way, the outer circular surface of the through hole sleeve 2 and the inner wall of the valve cavity are provided with anti-rotation devices, the anti-rotation devices adopt the mutual matching of an axial groove and an axial convex rib between the inner wall of the inner circular surface of the valve cavity and the outer circular surface of the valve cavity sleeve 2 to prevent the through hole sleeve 2 from deviating from the inlet passage 15, the axial length of the port sleeve 2 is less than one third of the axial length of the valve cavity, so that the contact area between the port sleeve 2 and the plunger body 3 is reduced, the upper filler 13 and the lower filler 17 are made of graphite filler or plastic with a lubricating function, the sealing specific pressure between the upper filler and the plunger body 3 is lower, and the opening and closing torque of the plunger body 3 is greatly reduced; the lower end face of the plunger body 3 is provided with a lower blind hole 19, the side wall of the lower blind hole 19 is provided with a radial hole 18 communicated with the outer circular surface of the plunger body 3, the radial hole 18 is concentric with the inlet channel 15 in the fully opened state of the plunger body 3, a medium in the inlet channel 15 directly reaches the outlet channel 20 through the lower blind hole 19, the medium only erodes the inner hole wall of the lower blind hole 19, the inner hole wall of the port sleeve 2 and the outer circular surface of the plunger body 3 are not scoured, and the inner hole wall of the lower blind hole 19 is scoured without influencing the sealing performance and the medium circulation performance, so that the sealing performance and the service life are greatly improved; the upper end face of the plunger body 3 is provided with an upper blind hole 14 concentric with the valve rod 10, an upper port of the upper blind hole 14 is fixedly connected with a valve rod nut 6 in threaded fit connection with the lower end of the valve rod 10, the upper end of the valve rod 10 is axially positioned and installed in an installation hole of the support 12 by upper and lower bearings, an axial guide device is arranged between the outer circular surface of the upper end of the plunger body 3 and a guide post 7 of the support 12 to prevent the plunger body 3 from rotating, the valve rod 10 drives the plunger body 3 to axially move through the valve rod nut 6 when rotating, the valve opening height is low, and the installation space is small. The bracket 12 is arranged on the upper end surface of the valve body 1 through the upright post 9.

An inner hole of the through-hole sleeve 2 is provided with an upper sealing ring and a lower sealing ring which are in dynamic sealing fit with the outer circular surface of the plunger body 3. The upper sealing ring is located on the upper end face of the through hole sleeve 2, the lower sealing ring is located on the lower end face of the through hole sleeve 2, the diameter of an inner hole of the connecting cylinder between the upper sealing ring and the lower sealing ring is larger than that of the inner hole of the upper sealing ring, the contact area between the plunger body 3 and the through hole sleeve 2 is reduced, and the opening and closing torque is reduced, as shown in fig. 2. The lower end face of the upper sealing ring and the upper end face of the lower sealing ring can also be connected with each other by connecting ribs.

The axial length of the lower blind hole 19 on the lower side of the central line of the radial hole 18 is at least equal to the distance between the central line of the inlet channel 15 and the lower end surface of the lower filler 17, so that the lower filler 17 is positioned outside the lower blind hole 19 in the fully opened state of the plunger body 3, and the lower filler 17 is prevented from being washed by media.

Through-hole cover 2 and the plunger body 3 adopt ceramic material, 6 sintering of valve-stem nut is in the last blind hole 14 of the

plunger body

3, 10 external screw threads of valve rod and 6 internal threads of valve-stem nut mutually support, realize the elevating movement of the plunger body 3, the connection degree of difficulty between current stop valve rod and the ceramic valve clack has been solved, be equipped with axial guiding device between the guide post 7 of valve-stem nut 6 and support 12, utilize the axial guide way mutually supporting on the metal material guide bar of 6 up end settings of valve-stem nut and guide post 7, prevent that the plunger body 3 is rotatory.

The upper filler 13 is arranged in a filler cavity between the upper end surface of the through-port sleeve 2 and the inner wall of the valve cavity and the outer circular surface of the plunger body 3 through a spring automatic compensation device. The automatic spring compensation device is composed of a spring 8, a packing pressing sleeve 4 and a packing pressing plate 5, wherein the packing pressing sleeve 4 is pressed on the upper end face of an upper packing 13 through the packing pressing plate 5, the packing pressing plate 5 is pressed on the upper end face of a valve body 1 through a bolt, the spring 8 is installed between the packing pressing plate 5 and the bolt, the upper packing 13, a through hole sleeve 2 and a lower packing 17 are pressed between the outer circular face of a plunger body 3 and a cylindrical valve cavity of the valve body 1, and the abrasion of the upper packing 13 and the lower packing 17 is automatically compensated through the elastic force of the spring 8. Through the elasticity of reasonable selection spring 8, can guarantee to seal under the prerequisite of specific pressure, can reduce the moment of opening and close of plunger body 3 again. Because the upper packing 13 and the lower packing 17 are used for secondary sealing of the medium leaked from the port sleeve 2, the pressure of the leaked medium is very low, and only lower sealing specific pressure is needed between all the upper packing 13 and the lower packing 17 and the plunger body 3, so that the opening and closing torque of the plunger body 3 can be reduced.

Claims

1. An anti-scouring zero-leakage plunger type stop valve comprises a valve body (1), a valve rod (10), a plunger body (3) and a hand wheel (11), wherein the valve body (1) is provided with a cylindrical valve cavity, an inlet channel (15) and an outlet channel (20) which are communicated with the cylindrical valve cavity; the method is characterized in that: the valve cavity at the inlet passage (15) is internally provided with a through-hole sleeve (2), the side wall of the through-hole sleeve (2) is provided with a through-hole (16) for communicating the inner hole of the through-hole with the inlet passage (15), the diameter of the through-hole (16) is at least equal to that of the inlet passage (15), the upper end surface and the lower end surface of the through-hole sleeve (2) are respectively provided with an upper filler (13) and a lower filler (17), the outer circular surface of the through-hole sleeve (2) is in dynamic sealing connection with the inner wall of the valve cavity, the inner hole wall is in dynamic sealing fit with the outer circular surface of the plunger body (3), and the outer circular surface of the through-hole sleeve (2) and the inner wall of the valve cavity are provided with anti-rotation devices; a lower blind hole (19) is formed in the lower end face of the plunger body (3), a radial hole (18) communicated with the outer circular face of the plunger body (3) is formed in the side wall of the lower blind hole (19), and the radial hole (18) is concentric with the inlet channel (15) in the fully-opened state of the plunger body (3); an upper blind hole (14) concentric with the valve rod (10) is formed in the upper end face of the plunger body (3), a valve rod nut (6) in threaded fit connection with the lower end of the valve rod (10) is fixedly connected to an upper port of the upper blind hole (14), the upper end of the valve rod (10) is axially positioned and installed in a mounting hole of the support (12) through upper and lower bearings, and an axial guide device is arranged between the outer circular surface of the upper end of the plunger body (3) and a guide column (7) of the support (12).

2. An anti-scour zero-leakage plunger stop valve as defined in claim 1, wherein: an inner hole of the through-hole sleeve (2) is provided with an upper sealing ring and a lower sealing ring which are in dynamic sealing fit with the outer circular surface of the plunger body (3).

3. An anti-scour zero-leakage plunger stop valve as claimed in claim 1 or claim 2 wherein: the axial length of the lower blind hole (19) at the lower side of the central line of the radial hole (18) is at least equal to the distance from the central line of the inlet channel (15) to the lower end surface of the lower filler (17).

4. An anti-scour zero-leakage plunger stop valve as claimed in claim 1 or claim 2 wherein: the through-hole sleeve (2) and the plunger body (3) are made of ceramic materials, the valve rod nut (6) is sintered in an upper blind hole (14) of the plunger body (3), and an axial guide device is arranged between the valve rod nut (6) and a guide column (7) of the support (12).

5. An anti-scour zero-leakage plunger stop valve as claimed in claim 3 wherein: the through-hole sleeve (2) and the plunger body (3) are made of ceramic materials, the valve rod nut (6) is sintered in an upper blind hole (14) of the plunger body (3), and an axial guide device is arranged between the valve rod nut (6) and a guide column (7) of the support (12).

6. An anti-flush zero-leakage plunger-type shut-off valve as defined in claim 1, 2 or 5, wherein: the upper filler (13) is arranged in a filler cavity between the upper end surface of the through-port sleeve (2) and the inner wall of the valve cavity and between the upper end surface of the through-port sleeve and the outer circular surface of the plunger body (3) through an automatic spring compensation device.

7. An anti-scour zero-leakage plunger stop valve as claimed in claim 3 wherein: the upper filler (13) is arranged in a filler cavity between the upper end surface of the through-port sleeve (2) and the inner wall of the valve cavity and between the upper end surface of the through-port sleeve and the outer circular surface of the plunger body (3) through an automatic spring compensation device.

8. An anti-scour zero-leakage plunger stop valve as defined in claim 4, wherein: the upper filler (13) is arranged in a filler cavity between the upper end surface of the through-port sleeve (2) and the inner wall of the valve cavity and between the upper end surface of the through-port sleeve and the outer circular surface of the plunger body (3) through an automatic spring compensation device.