CN116066582B

CN116066582B - Automatic pressure relief single valve seat gate valve

Info

Publication number: CN116066582B
Application number: CN202310206206.9A
Authority: CN
Inventors: 马西莫·扎帕蒂尼; 张传芳; 洪惠美; 李建国; 金凤禄
Original assignee: Shandong Weima Equipment Technology Co ltd; Shandong Hongfeng Intelligent Equipment Co ltd
Current assignee: Shandong Weima Equipment Technology Co ltd; Shandong Hongfeng Intelligent Equipment Co ltd
Priority date: 2023-03-07
Filing date: 2023-03-07
Publication date: 2023-06-23
Anticipated expiration: 2043-03-07
Also published as: CN116066582A

Abstract

The utility model discloses an automatic pressure relief single valve seat gate valve, which relates to the technical field of pipeline valves and comprises a valve body, wherein the upstream end and the downstream end of the valve body are both provided with connecting flanges, the connecting flanges are connected with a pipeline, a cavity is arranged in the valve body, a valve rod is arranged in the cavity, the lower end of the valve rod is connected with a gate plate through a cylindrical nut, the upper end of the valve rod penetrates through the top of the valve body and is connected with a hand wheel, a sealing device is arranged at the joint of the valve rod and the valve body, an auxiliary valve body is connected with an outlet of the valve body through an inner hexagon screw, a valve seat is overlaid on the auxiliary valve body, and the valve seat and the gate plate form a seal.

Description

Automatic pressure relief single valve seat gate valve

Technical Field

The utility model relates to the technical field of pipeline valves, in particular to an automatic pressure relief single-valve seat gate valve.

Background

Gate valves are commonly used to shut off fluid flow entirely or to provide adequate flow in a conduit in the fully open position. Thus, it can be used in either the fully closed position or the fully open position. Gate valves are suitable for most media including steam, water, oil, air, gas, and the like. The traditional gate valve consists of a valve body, two valve seats, a gate plate, a valve rod, a pressing sleeve and a hand wheel for operating the valve, wherein the two valve seats are respectively positioned at two sides of the gate plate to realize sealing, and the valve seats and the gate plate together play a role in closing or limiting fluid flow or allowing the fluid to completely flow through the valve.

In the prior art, for example, the Chinese patent publication number CN203189767U, entitled "automatic pressure relief structure of parallel double-flashboard gate valve and unidirectional automatic pressure relief structure of parallel double-flashboard gate valve" discloses a gate valve, which comprises a valve body, two valve seats and two flashboards, wherein the valve seats are embedded in the valve body, flashboards which can be clung to or separated from the valve seats under the action of driving force of an actuating mechanism are installed in the valve body, the two flashboards are oppositely placed in parallel, the two flashboards are all provided with front and rear through relief holes, and an automatic pressure relief device which can automatically relieve redundant pressure inside a valve cavity is installed in the relief holes. The utility model has the following defects: once the temperature in the valve cavity is too high, when the medium is dirty fluid or corrosive fluid with particles, the probability of the automatic pressure relief device blocking the shell is very high, and the stability performance of the system is seriously affected.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide an automatic pressure relief single valve seat gate valve, which can solve the technical problems that when two valve seats are used for sealing, the inner cavity of a valve body is extremely easy to be blocked with medium, the volume of liquid in a valve cavity is increased by hundreds of times after being gasified under a high-temperature working condition, and the valve cavity pressure is overlarge, so that the valve is easy to fail.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides an automatic pressure release single valve seat gate valve, includes the valve body, be equipped with flange on the valve body, the inside cavity that is equipped with of valve body, be equipped with the valve rod in the cavity, the valve rod lower extreme is connected with the flashboard, the valve rod upper end runs through out the valve body top and is connected with the hand wheel, the junction of valve rod and valve body is equipped with sealing device, the exit of valve body has an auxiliary valve body through socket head cap screw connection, the build-up welding has the disk seat on the auxiliary valve body, the disk seat forms sealedly with the flashboard.

Preferably, a metal gasket is arranged between the valve body and the auxiliary valve body.

Preferably, the valve rod is connected with the flashboard through a cylindrical nut, a through hole is formed in the cylindrical nut, the center line of the through hole is perpendicular to the center line of a threaded hole in the cylindrical nut, a jack matched with the through hole is formed in the lower end of the valve rod, and the jack is connected with the through hole through a pin shaft.

Preferably, the front surface of the gate plate faces the downstream end of the gate valve, and a plane plate is adopted for the front surface of the gate plate and is in contact with the contact surface of the valve seat to realize sealing.

Preferably, the back of the gate plate faces the upstream end of the gate valve, a slot is formed in the back of the gate plate, the valve rod and the cylindrical nut are placed in the slot, and a gap is formed between the slot and the cylindrical nut.

Preferably, two protruding valve body inclined planes are symmetrically arranged on the inner surface of the upstream end of the valve body, the protruding degree of the two valve body inclined planes is increased from top to bottom, two flashboard inclined planes are arranged on the back surface of the flashboard, and the two flashboard inclined planes are respectively contacted with the two protruding valve body inclined planes, so that the flashboard moves forwards to contact with the valve seat, and sealing is formed.

Preferably, the top of the valve body is provided with an integral flange, the top of the integral flange is connected with a support bearing through a plurality of support rods, and the support bearing is connected with the plurality of support rods through hexagonal nuts;

the support bearing is connected with a support bearing nut through threads;

and the support bearing is provided with a grease injection port.

Preferably, the top of the valve rod is in threaded connection with a valve rod nut, a hand wheel is sleeved on the outer side of the valve rod nut, and the top of the valve rod nut is in threaded connection with a hand wheel nut.

Preferably, the sealing device comprises a pressing plate, the pressing plate is sleeved on the valve rod wall, studs are arranged on two sides of the pressing plate, the pressing plate is connected with an integral flange through the studs, a fastening nut is connected to the top of each stud in a threaded mode, a pressing sleeve is arranged at the bottom of the pressing plate, an upper bearing is arranged in the pressing sleeve, a trough is formed in the integral flange, valve rod packing is arranged in the trough, a lower bearing is arranged at the bottom of the trough, and the lower bearing and the upper bearing are all sleeved on the valve rod wall.

Preferably, a disc spring is arranged between the fastening nut and the pressing plate.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the valve seat is arranged for sealing, the upstream of the gate valve is not sealed, the downstream is sealed, the valve cavity is not over-pressurized under the working condition of high temperature and high pressure, the inner cavity of the valve body is communicated with the upstream pipeline, the gate valve can automatically release the pressure clamped in the cavity, and the condition of clamping media in the valve cavity is avoided.

2. The gate plate and the valve seat are sealed by medium pressure, once the upstream pressure is increased, the sealing force between the gate plate and the valve seat is increased in proportion to the increase of the pressure, and compared with the traditional gate valve with two valve seats, the gate plate is pushed to downwards by external force to realize sealing.

3. The front sealing surface of the flashboard adopts the plane plate, and is inclined relative to the two sealing surfaces of the traditional flashboard, so that the flashboard and the valve seat are difficult to process and match, and the plane plate is simpler to process and more convenient to maintain; the sealing surface of the flashboard and the valve seat is perpendicular to the flow direction of the medium, the operation force required when the valve is opened and closed is small, the operation force is small, and the abrasion of the contact surface of the flashboard and the valve seat is also small.

4. The valve rod is guided by the upper bearing and the lower bearing, so that the valve rod is prevented from being damaged by transverse movement of the valve rod, and sealing failure is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is an enlarged view of the utility model at A in FIG. 2;

FIG. 4 is a schematic view of the structure of the inclined surface of the valve body according to the present utility model;

FIG. 5 is a schematic view of the structure of the inclined surface of the gate plate in the utility model;

fig. 6 is a schematic structural diagram of a second embodiment of the present utility model.

Reference numerals illustrate:

1-valve body, 2-flange, 3-valve stem, 4-cylindrical nut, 5-flashboard, 6-hand wheel, 7-sealing device, 71-platen, 72-stud, 73-fastening nut, 74-press sleeve, 75-upper bearing, 76-valve stem packing, 77-lower bearing, 78-disc spring, 8-socket head cap screw, 9-auxiliary valve body, 10-metal gasket, 11-pin shaft, 12-slot, 13-valve body inclined plane, 14-flashboard inclined plane, 15-integral flange, 16-support bar, 17-support bearing, 18-hexagonal nut, 19-support bearing nut, 20-grease injection port, 21-valve stem nut, 22-hand wheel nut, 23-valve seat sealing ring.

Detailed Description

The utility model will now be described in detail, by way of example, with reference to the accompanying drawings, wherein it is evident that the embodiments described are only some, but not all, of the embodiments of the utility model.

Example 1

As shown in fig. 1-5, an automatic pressure relief single valve seat gate valve comprises a valve body 1, wherein the upstream end and the downstream end of the valve body 1 are both provided with a connecting flange 2, the connecting flange 2 is connected with a pipeline, a cavity is arranged inside the valve body 1, a valve rod 3 is arranged in the cavity, the lower end of the valve rod 3 is connected with a flashboard 5 through a cylindrical nut 4, the upper end of the valve rod 3 penetrates through the top of the valve body 1 and is connected with a hand wheel 6, a sealing device 7 is arranged at the joint of the valve rod 3 and the valve body 1, an auxiliary valve body 9 is connected at the outlet of the valve body 1 through an inner hexagon screw 8, a valve seat is overlaid on the auxiliary valve body 9, and the valve seat and the flashboard 5 form sealing.

In the utility model, the joint of the valve body 1 and the valve rod 3 is sealed by arranging the sealing device 7, so that the leakage of a medium is prevented; the valve seat is overlaid on the auxiliary valve body 9 to form an integrated structure with the auxiliary valve body 9, the flashboard 5 and the auxiliary valve body 9 with the integrated valve seat can be made of forged materials, and can be carbon steel or stainless steel, and the quality grade of the forged materials is far higher than that of the traditional cast materials, so that the valve seat can be used for slurry, viscous liquid and any type of corrosive medium, such as strong acid.

According to the utility model, the valve seat is arranged for sealing, the upstream of the gate valve is not sealed, the downstream is sealed, the valve cavity is not over-pressurized under the working condition of high temperature and high pressure, the inner cavity of the valve body 1 is communicated with the upstream pipeline, the gate valve can automatically release the pressure clamped in the cavity, and the condition of clamping media in the valve cavity is avoided.

Further, in the present embodiment, the metal gasket 10 is provided between the valve body 1 and the sub-valve body 9, and the metal gasket 10 can prevent leakage between the valve body 1 and the sub-valve body 9.

Further, in this embodiment, the through hole is formed in the cylindrical nut 4, the center line of the through hole is perpendicular to the center line of the threaded hole in the cylindrical nut 4, the lower end of the valve rod 3 is provided with a jack matched with the through hole, the jack is connected with the through hole through a pin 11, and the valve rod 3 or the cylindrical nut 4 can be prevented from loosening by the structural design.

Further, in this embodiment, the front surface of the gate 5 faces the downstream end of the gate valve, the front surface of the gate 5 adopts a plane plate, and the plane plate contacts with the contact surface of the valve seat to realize sealing, so that the gate and the valve seat are inclined relative to the two sealing surfaces of the conventional gate, and are difficult to process and match, while the plane plate is simpler to process and more convenient to maintain; the sealing surface of the flashboard 5 and the valve seat is perpendicular to the flow direction of the medium, the operation force required when the valve is opened and closed is small, the operation force is small, and the abrasion of the contact surface of the flashboard 5 and the valve seat is also small.

Further, in this embodiment, the back of flashboard 5 is towards the upstream end of gate valve, slot 12 has been seted up to the back of flashboard 5, valve rod 3 and cylindrical nut 4 are arranged in slot 12, be equipped with the clearance between slot 12 and the cylindrical nut 4, this structural design can make flashboard 5 more nimble, and the assembly is more convenient.

Further, in the present embodiment, two protruding valve body inclined surfaces 13 are symmetrically provided on the inner surface of the upstream end of the valve body 1, the protruding valve body inclined surfaces 13 are increased from top to bottom, two shutter inclined surfaces 14 are provided on the back surface of the shutter 5, and the two shutter inclined surfaces 14 are respectively in contact with the two protruding valve body inclined surfaces 13, so that the shutter 5 moves forward to contact the valve seat, forming a seal.

Further, in this embodiment, an integral flange 15 is provided at the top of the valve body 1, the top of the integral flange 15 is connected with a support bearing 17 through four support rods 16, the support bearing 17 is connected with the four support rods 16 through hexagonal nuts 18, and the support bearing 17 is used for supporting a valve rod nut 21;

the support bearing 17 is in threaded connection with a support bearing nut 19, and the support bearing nut 19 is used for preventing the valve rod 3 from flying out;

the support bearing 17 is provided with a grease filling port 20, and lubricating oil lubricates a valve rod nut 21 through the grease filling port 20.

Further, in this embodiment, the top of the valve rod 3 is screwed with a valve rod nut 21, the outer side of the valve rod nut 21 is sleeved with a hand wheel 6, the top of the valve rod nut 21 is screwed with a hand wheel nut 22, and the hand wheel nut 22 is used for preventing the hand wheel 6 from being separated from the valve rod nut 21. By rotating the hand wheel 6, the flashboard 5 and the valve rod 3 synchronously move up and down in the cavity of the valve body 1, and the effect of closing or restricting the fluid flow or allowing the fluid to completely flow through the gate valve is realized.

Further, in this embodiment, the sealing device 7 includes a pressing plate 71, the pressing plate 71 is sleeved on the stem wall of the valve stem 3, studs 72 are disposed on two sides of the pressing plate 71, the pressing plate 71 is connected with the integral flange 15 through the studs 72, a fastening nut 73 is screwed on the top of the studs 72, a pressing sleeve 74 is disposed at the bottom of the pressing plate 71, an upper bearing 75 is disposed in the pressing sleeve 74, a trough is disposed in the integral flange 15, a valve stem packing 76 is disposed in the trough, a lower bearing 77 is disposed at the bottom of the trough, and the lower bearing 77 and the upper bearing 75 are all sleeved on the stem wall of the valve stem 3. When the sealing device is used, the pressing plate 71 pushes the pressing sleeve 74 to compress the valve rod filler 76 under the action of the double-end stud 72 and the fastening nut 73 to realize sealing, the upper bearing 75 and the lower bearing 77 play a guiding role on the valve rod 3, and the valve rod filler 76 is prevented from being damaged by the transverse movement of the valve rod 3, so that the sealing is invalid.

Further, in the present embodiment, the disc spring 78 is disposed between the fastening nut 73 and the pressing plate 71, and the load variation of the stud 72 and the fastening nut 73 due to the temperature variation can be minimized by providing the disc spring 78.

Working principle: when the valve is used, the hand wheel 6 is rotated clockwise, the valve rod 3 moves downwards, and the gate valve is closed; the hand wheel 6 is rotated anticlockwise, the valve rod 3 moves upwards, and the gate valve is opened. In the open position, the shutter 5 and the valve stem 3 are completely moved to the upper position, the valve stem 3 protrudes out of the valve stem nut 21, and the flow passage is unobstructed. In the closed position, the shutter 5 reaches a lower position, the inclined surface 13 of the valve body pushes the shutter 5 against the contact surface of the valve seat, forming an initial low-pressure seal, isolating the valve chamber from the downstream conduit, and once the upstream pressure increases, the sealing force between the shutter 5 and the valve seat increases proportionally with the pressure.

In order to open the gate valve and release the pressure, the valve stem 3 must be moved upwards (the hand wheel 6 should be rotated anticlockwise), the contact force between the gate 5 and the valve seat comes from the friction of the fluid pressure, so once the gate 5 is moved a few millimeters, the pressure is released, the contact force is reduced to zero, the gate valve can be opened easily, the hand wheel 6 is rotated continuously, the gate 5 reaches the upper position, the flow channel is opened completely without obstruction, and medium circulation is facilitated.

Example two

As shown in fig. 6, the seal between the gate 5 and the auxiliary valve body 9 is no longer a pure metal seal, a cylindrical groove is processed on the auxiliary valve body 9, a valve seat sealing ring 23 is pressed in the groove, and the valve seat sealing ring 23 is made of thermoplastic material, so that hardening treatment on the surface of the gate 5 can be avoided.

Example III

The top of the valve stem 3 is not provided with a hand wheel 6, but is connected with a circular or square flange which is used as an interface to connect any type of actuating mechanism, such as a gear box, a pneumatic device, an electric device and the like, through bolts. The scheme is suitable for medium-high pressure medium-large valves.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, shall cover the scope of the present utility model by equivalent substitution or modification according to the technical scheme of the present utility model and the application concept thereof.

Claims

1. The utility model provides an automatic pressure release single valve seat gate valve, includes valve body (1), be equipped with flange (2) on valve body (1), the inside cavity that is equipped with of valve body (1), be equipped with valve rod (3) in the cavity, valve rod (3) lower extreme is connected with flashboard (5), valve rod (3) upper end runs through valve body (1) top and is connected with hand wheel (6), the junction of valve rod (3) and valve body (1) is equipped with sealing device (7), its characterized in that: an outlet of the valve body (1) is connected with a secondary valve body (9) through an inner hexagon screw (8), a valve seat is formed on the secondary valve body (9) in a surfacing mode, and the valve seat and the flashboard (5) form a seal;

the valve rod (3) is connected with the flashboard (5) through a cylindrical nut (4), a through hole is formed in the cylindrical nut (4), the center line of the through hole is perpendicular to the center line of a threaded hole in the cylindrical nut (4), a jack matched with the through hole is formed in the lower end of the valve rod (3), and the jack is connected with the through hole through a pin shaft (11);

a slot (12) is formed in the back face of the flashboard (5), the valve rod (3) and the cylindrical nut (4) are arranged in the slot (12), and a gap is formed between the slot (12) and the cylindrical nut (4).

2. An automatic pressure relief single seat gate valve as defined in claim 1, wherein: a metal gasket (10) is arranged between the valve body (1) and the auxiliary valve body (9).

3. An automatic pressure relief single seat gate valve as defined in claim 1, wherein: the front face of the flashboard (5) faces the downstream end of the gate valve, the front face of the flashboard (5) adopts a plane plate, and the plane plate is in contact with the contact surface of the valve seat to realize sealing.

4. An automatic pressure relief single seat gate valve as defined in claim 1, wherein: the back of the flashboard (5) faces the upstream end of the gate valve.

5. An automatic pressure relief single seat gate valve as defined in claim 1, wherein: two protruding valve body inclined planes (13) are symmetrically arranged on the inner surface of the upstream end of the valve body (1), the protruding valve body inclined planes (13) are increased from top to bottom, two flashboard inclined planes (14) are arranged on the back surface of the flashboard (5), and the two flashboard inclined planes (14) are respectively contacted with the two protruding valve body inclined planes (13) so that the flashboard (5) moves forwards to contact with a valve seat to form sealing.

6. An automatic pressure relief single seat gate valve as defined in claim 1, wherein: the top of the valve body (1) is provided with an integral flange (15), the top of the integral flange (15) is connected with a support bearing (17) through a plurality of support rods (16), and the support bearing (17) is connected with the plurality of support rods (16) through hexagonal nuts (18);

a support bearing nut (19) is connected to the support bearing (17) in a threaded manner;

the support bearing (17) is provided with a grease injection port (20).

7. An automatic pressure relief single seat gate valve as defined in claim 1, wherein: the novel valve is characterized in that a valve rod nut (21) is connected to the top of the valve rod (3) in a threaded mode, a hand wheel (6) is sleeved on the outer side of the valve rod nut (21), and a hand wheel nut (22) is connected to the top of the valve rod nut (21) in a threaded mode.

8. An automatic pressure relief single seat gate valve as defined in claim 1 or 6, wherein: sealing device (7) are including clamp plate (71), clamp plate (71) cover is established on valve rod (3) pole wall, the both sides of clamp plate (71) all are provided with stud (72), clamp plate (71) are connected with integral flange (15) through stud (72), the top threaded connection of stud (72) has fastening nut (73), clamp plate (71) bottom is equipped with presses cover (74), be equipped with upper bearing (75) in pressing cover (74), the silo is seted up to integral flange (15) inside, be equipped with valve rod filler (76) in the silo, the silo bottom is equipped with lower bearing (77), lower bearing (77) all overlap with upper bearing (75) and establish on valve rod (3) pole wall.

9. The automatic pressure relief single seat gate valve of claim 8, wherein: a disc spring (78) is arranged between the fastening nut (73) and the pressing plate (71).