CN110805709A

CN110805709A - Non-rising stem locking soft seal gate valve

Info

Publication number: CN110805709A
Application number: CN201911186637.3A
Authority: CN
Inventors: 温国庭; 张永清; 吕振堤
Original assignee: Shanxi Longda Yuwei Fluid Control Equipment Co Ltd
Current assignee: Shanxi Longda Yuwei Fluid Control Equipment Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-02-18

Abstract

The invention provides a non-rising stem locking soft seal gate valve which comprises a gate plate and a valve rod, wherein the valve rod comprises a bottom rod and an ejector rod along the length direction of the valve rod; the bottom rod is provided with a first accommodating area, an elastic piece and a movable block are arranged in the first accommodating area, the ejector rod is provided with a second accommodating area, and the second accommodating area is used for accommodating the movable block; when the elastic piece is in a first state, the top rod and the bottom rod are in a combined state so as to form key matching between the bottom rod and the top rod, and when torque is applied to the top rod, the torque is transmitted to the bottom rod through the key matching; when the elastic piece is in the second state, the ejector rod and the bottom rod are in a separated state, and the key matching between the bottom rod and the ejector rod disappears. When the key is matched, the two sections of valve rods can rotate simultaneously, so that the gate valve can be conveniently opened and closed; when the key cooperation disappears, two sections valve rods are relatively independent, the safety of the gate valve is improved, the gate valve is effectively prevented from being operated by idle personnel, and the economic benefit of water supply enterprises is improved.

Description

Non-rising stem locking soft seal gate valve

Technical Field

The invention relates to the field of fluid sealing devices, in particular to a non-rising stem locking soft sealing gate valve.

Background

The soft seal gate valve is a common general gate valve for a water supply system and mainly comprises an exposed rod soft seal gate valve and a non-exposed rod soft seal gate valve. The main material of the soft seal gate valve is nodular cast iron, the weight of the soft seal gate valve is reduced by about 20% -30% compared with that of the traditional gray iron gate valve, the soft seal gate valve has good physical and mechanical properties, and when the soft seal gate valve is under the action of external force or fluid hammer force, the soft seal gate valve still has good impact resistance, ensures that the gate valve is not easy to deform, break and the like, and greatly prolongs the service life of the soft seal gate valve. Meanwhile, the soft seal gate valve adopts nodular cast iron as a main material, and has the advantages of low cost, reliable performance, simplicity and easiness in operation, convenience in maintenance, high cost performance and the like.

Compared with a hard sealing gate valve which needs to be provided with a pit, the soft sealing gate valve has the advantages that impurities or dirt in fluid can pass through the soft sealing gate valve smoothly without resistance, the accumulation of the impurities is not easy to occur, and the gate valve is guaranteed to have very good opening and closing capacity. The soft sealing gate valve is widely applied to urban tap water systems and has a main reason that the outer part and the inner cavity of the valve body of the soft sealing gate valve are made of non-toxic epoxy resin powder, and a paint film is uniformly and firmly coated on the surface of a casting by using an electrostatic powder spraying technology, so that the inner cavity and a gate plate of the gate valve are completely covered by the paint film, the casting is completely separated from fluid, the gate valve is not easy to rust, corrode and the like, and the water safety of residents is effectively guaranteed.

As shown in fig. 1, it is a structure of a dark rod soft seal gate valve in the prior art, and comprises a valve body 1 'made of nodular cast iron QT450, the valve body 1' has a cavity 11 'inside, and the cavity 11' is used for fluid to flow along the horizontal direction in fig. 1. The cavity 11 ' contains the flashboard 2 ', and the flashboard 2 ' comprises a flashboard framework 21 ' and an encapsulating layer 22 ' wrapping the outer surface of the flashboard framework 21 ', wherein the flashboard framework 21 ' is made of QT450 materials, and the encapsulating layer is made of EPDM materials. The valve body 1 ' is provided with a guide groove 12 ', and the connecting position of the lower part of the guide groove 12 ' and the cavity 11 ' is wedge-shaped from top to bottom by taking the orientation shown in fig. 1 as a reference, namely the lower part of the guide groove 12 ' is of a structure with a large upper part and a small lower part. The gate plate 2 'is provided with a guide rail which is in transition fit with the guide groove to play a role in guiding so as to ensure that the gate plate 2' does not deviate from the center in the process of moving along the up-down direction shown in figure 1. When the bottom of the gate plate 2 ' with flat bottom design contacts the bottom wall of the cavity 11 ', i.e. moves to the lower extreme position shown in the orientation of fig. 1, the rubber at the bottom of the gate plate 2 ' and the ring-shaped rubber at the top of the gate plate 2 ' are pressed against each other at the wedge-shaped position of the lower part of the guide groove 12 ' to form a seal, thereby blocking the fluid flow and achieving the gate valve closing.

As shown in FIG. 1, the up-and-down movement of the gate plate 2 ' is driven by the rotation of the valve rod 3 ', and the valve rod 3 ' is of an integral structure and is made of 2Cr13 material. Valve rod 3 ' passes through flashboard nut 4 ' fixed mounting in the top of flashboard 2 ', and flashboard nut 4 ' is formed by ZCuAi10Fe3 material preparation, is formed with trapezoidal internal thread in the inside of flashboard nut 4 ', and the outside of valve rod 3 ' is formed with trapezoidal external screw thread, and flashboard nut 4 ' forms threaded connection with valve rod 3 ' to turn into the power along vertical direction in figure 1 with the torque, and then drive flashboard 2 ' and reciprocate along vertical direction. The top of the valve rod 3 ' is provided with a hand wheel 5 ', the operation is light and flexible, and meanwhile, the hand wheel 5 ' is provided with a marked opening and closing direction mark for facilitating the operation of an operator according to the intention of opening and closing. The shutter 2 ' is displaced up and down, i.e., the rotational motion is changed into the linear motion, that is, the operation torque is changed into the operation thrust, by the shutter nut 4 ' fixed to the top of the shutter 2 ' and the guide groove 12 ' on the valve body 1 '. When the hand wheel 5 ' is rotated to open the valve, the valve rod 3 ' which rotates together with the hand wheel 5 ' drives the flashboard 2 ' to move upwards through the trapezoidal thread of the valve rod 3 ' and the spiral motion of the flashboard nut 4 ', when the lifting height of the flashboard 2 ' is equal to 1: 1 times of the through diameter of the valve, the channel of the fluid is completely opened, but the position cannot be monitored during operation. In actual use, the hand wheel 5' is rotated in the opening direction until it is in its fully open position, where it is not rotated. Considering that the locking phenomenon can occur due to the temperature change, the valve is generally opened to the top position, and then the valve is rewound for a half circle to a full circle to be used as the position of the fully opened valve. When the valve is closed, the hand wheel 5 ' is operated in a reverse direction, the gate plate 2 ' moves downwards along the guide groove 12 ' of the valve body 1 ' along with the screw motion of the valve rod 3 ' and the gate plate nut 4 ', until the whole gate plate 2 ' enters the bottom end of the guide groove 12 ' of the valve body 1 ', the gate plate 2 ' is in interference fit with the sealing surface of the valve body 1 ' after being integrally encapsulated, and the gate plate is tightly extruded with a notch by utilizing the excellent elastic memory of high-quality rubber, so that the motion of fluid is blocked, and the valve is reliably closed.

Because the non-rising stem soft sealing gate valve has the advantages of simple structure, compact external dimension, convenient maintenance and use, low raw material cost and the like, the non-rising stem soft sealing gate valve is widely applied to pipe networks of factory water supply, fire fighting facilities, public drinking water and the like. However, the valve rod 3 'can be easily and randomly operated through the hand wheel 5', and no safety, anti-theft and other measures are set, so that the aspects of preventing water theft of a tap water system, random operation of factory water supply and the like can not be effectively controlled and utilized through the non-rising stem soft seal gate valve, the economic benefit of water supply enterprises is improved, and the full utilization of increasingly short water resources cannot be effectively guaranteed.

Disclosure of Invention

The invention aims to provide a non-rising stem locking soft sealing gate valve, which solves the problem that the safety and the anti-theft performance of the non-rising stem soft sealing gate valve are poor because any person can operate the non-rising stem locking soft sealing gate valve at will in the conventional non-rising stem soft sealing gate valve.

In order to solve the technical problems, the invention adopts the following technical scheme:

a non-rising stem locking soft sealing gate valve comprises a gate plate and a valve rod fixedly connected with the gate plate, wherein the valve rod comprises a bottom rod fixedly connected with the gate plate and an ejector rod connected with the bottom rod along the length direction of the valve rod;

one end of the bottom rod, which is far away from the flashboard, is provided with a first accommodating area, an elastic piece and a movable block are arranged in the first accommodating area, one end of the ejector rod, which is connected with the bottom rod, is provided with a second accommodating area, and the second accommodating area is used for accommodating the movable block;

when the elastic piece is in a first state, the top rod and the bottom rod are in a combined state, part of the movable block is accommodated in the first accommodating area, the other part of the movable block is accommodated in the second accommodating area so as to form key fit between the bottom rod and the top rod, and when torque is applied to the top rod, the torque is transmitted to the bottom rod through the key fit;

when the elastic piece is in the second state, the ejector rod and the bottom rod are in a separated state, the movable block is completely accommodated in the first accommodating area, and the key matching between the bottom rod and the ejector rod disappears.

Optionally, the elastic member includes a spring, and the first accommodating area includes a spring accommodating area and a movable block accommodating area;

when the spring is in a first compression state, under the action of the reset force of the spring, the movable block moves towards the ejector rod, and a key fit is formed between the bottom rod and the ejector rod;

when external force acts on the movable block, the spring is in a second compression state, and the movable block is completely accommodated in the movable block accommodating area.

Optionally, the gate valve further includes a valve body and a valve cover fixedly connected to each other, the valve cover and the valve body together form a hollow accommodating cavity, the bottom rod is installed in the accommodating cavity, a bottom rod sealing portion is formed at one end of the bottom rod, which is far away from the gate valve, and the first accommodating area is disposed in the bottom rod sealing portion;

the valve body is characterized in that a bottom rod clamping portion is arranged on the end face of the bottom rod sealing portion, and the bottom rod clamping portion is connected with the end face, far away from the valve body, of the valve cover in a clamping mode.

Optionally, the outer circumferential surface of the bottom rod sealing part is connected with the inner wall surface of the valve cover in a sealing mode through a plurality of O-shaped sealing rings.

Optionally, the valve body is in threaded fastening connection with the valve cover, and a sealing ring is arranged between the valve body and the valve cover in the circumferential direction of the valve body.

Optionally, the gate valve still include with the gland that the valve gap links to each other, the gland with the one end that the valve gap links to each other has the joint face, the ejector pin with the one end that the sill bar links to each other has ejector pin joint portion, ejector pin joint portion with the joint face joint of gland.

Optionally, a channel penetrating through the ejector rod along the length direction of the ejector rod is formed in the ejector rod, a jackscrew is arranged in the channel, and the jackscrew can move along the channel under the action of external force;

the end face of one end, far away from the movable block, of the jackscrew is provided with a special-shaped boss, and the gate valve further comprises a special-shaped key matched with the special-shaped boss.

Optionally, the channel has a position adjustment portion that is in threaded or interference fit with the jackscrew;

when the jackscrew is at the first position, the ejector rod and the bottom rod are in a combined state;

when the jackscrew is in the second position, the ejector pin is in the state of separation with the sill bar.

Optionally, the gate valve still includes the hand wheel, the one end of keeping away from of passageway the sill bar has the internal thread, the hand wheel passes through threaded fastener detachably to be fixed the one end of keeping away from of ejector pin the sill bar.

Optionally, the top rod, the bottom rod and the movable block are all made of 06Cr19Ni10 material.

The invention has the beneficial effects that: on the basis of not changing the integral structure of the existing non-rising stem soft seal gate valve and not influencing the original working principle and performance, the valve rod is arranged into two sections, so that adjustable key matching is formed between the two sections of the valve rod, and when the key matching exists, the two sections of the valve rod can rotate simultaneously, so that the gate valve can be conveniently opened and closed by operating the valve rod; when the key cooperation disappears, two sections valve rods are relatively independent, the safety of the gate valve is improved, the gate valve is effectively prevented from being operated by idle personnel, and the economic benefit of water supply enterprises is improved.

Drawings

FIG. 1 shows a block diagram of a prior art blind stem soft seal gate valve;

FIG. 2 is a block diagram illustrating a concealed rod locking soft seal gate valve in an integrated state according to an embodiment of the present application;

FIG. 3 shows an enlarged view of area A in FIG. 2;

FIG. 4 illustrates a block diagram of a blind stem lock soft seal gate valve in a separated state in an embodiment of the present application;

fig. 5 shows an enlarged view of region B in fig. 4.

Wherein the content of the first and second substances,

1', a valve body; 11', a cavity; 12', a guide groove;

2', a gate plate; 21', a gate plate framework; 22' and an encapsulating layer;

3', a valve rod;

4', a gate nut;

5', a hand wheel;

1. a valve body; 11. a cavity; 12. a guide groove; 13. a valve body mounting portion; 14. an accommodating cavity;

2. a shutter plate; 21. a shutter framework; 22. wrapping an adhesive layer;

3. a valve stem; 31. a top rod; 311. a second accommodating area; 312. a channel; 313. carrying out top thread; 314. an opposite-shaped boss; 315. a mandril clamping part; 32. a bottom bar; 321. a first accommodating area; 3211. a spring receiving area; 3212. a movable block accommodating area; 322. a bottom rod sealing part; 3221. a bottom bar clamping part;

4. a gate nut;

5. an elastic member; 51. a spring;

6. a movable block;

7. a valve cover; 71. an O-shaped sealing ring;

8. a gland; 81. a hexagonal copper nut;

9. a hand wheel; 91. hand wheel bolt.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.

The application provides a non-rising stem locking soft seal gate valve, on the basis of not changing the overall structure of the existing non-rising stem soft seal gate valve and not influencing the original working principle and performance, a valve rod is arranged into two sections, so that adjustable key matching is formed between the two sections of the valve rod, when the key matching exists, the two sections of the valve rod can rotate simultaneously, and the gate valve can be conveniently operated to be opened and closed; when the key matching disappears, the two valve rods are relatively independent, and the safety of the gate valve is improved.

As shown in fig. 2 to 5, the dark-bar locking soft seal gate valve in the present application includes a valve body 1 and a gate plate 2, the valve body 1 is made of ductile cast iron QT450, and the valve body 1 has a cavity 11 inside, the cavity 11 being used for fluid to flow in the horizontal direction in fig. 2 and 4. The cavity 11 contains the flashboard 2, and the flashboard 2 includes flashboard skeleton 21 and the rubber coating layer 22 of cladding in flashboard skeleton 21 surface, and wherein, flashboard skeleton 21 is made by QT450 material, and rubber coating layer 22 is made by EPDM material. The valve body 1 comprises a valve body mounting part 13 extending along the vertical direction in fig. 2 and 4, a guide groove 12 is formed in the valve body mounting part 13, and the connecting position of the lower part of the guide groove 12 and the cavity 11 is wedge-shaped from top to bottom with the orientation shown in fig. 3 and 5 as the standard, namely the lower part of the guide groove 12 is of a structure with a large upper part and a small lower part. The gate plate 2 is provided with a guide rail which is in transition fit with the guide groove to play a role in guiding so as to ensure that the gate plate 2 does not deviate from the center in the process of moving in the up-down direction shown in fig. 2 and 4. When the bottom of the gate plate 2 with flat bottom is in contact with the bottom wall of the cavity 11, i.e. moves to the lower limit position, the rubber at the bottom of the gate plate 2 and the ring-shaped rubber at the top of the gate plate 2 are pressed against each other at the wedge-shaped position of the lower part of the guide groove 12 to form a seal, thereby blocking the fluid flow and achieving the closing of the gate valve.

Further, the up-and-down movement of the gate plate 2 is driven to move by the rotation of the valve rod 3, the valve rod 3 is of a split structure and comprises an ejector rod 31 and a bottom rod 32, the ejector rod 31 and the bottom rod 32 are both made of 06Cr19Ni10 material, the physical performance and the mechanical performance of the valve rod 3 are improved, and the valve rod 3 can be ensured to meet the relevant regulations of the torque value specified in the national urban construction industry Standard of the people's republic of China (CJ/T216-2013) in the use process. The sill bar 32 passes through 4 fixed mounting of flashboard nut in the top of flashboard 2, and flashboard nut 4 is formed by ZCuAi10Fe3 material preparation, is formed with trapezoidal internal thread in the inside of flashboard nut 4, and the surface of sill bar 32 is formed with trapezoidal external screw thread, and flashboard nut 4 forms threaded connection with the sill bar to turn into the power along vertical direction in fig. 2 and fig. 4 with the torque, and then drive flashboard 2 and reciprocate along vertical direction.

Further, along the length direction of the valve rod 3, that is, the vertical direction in fig. 2 and 4, an upper rod 31 and a lower rod 32 are arranged up and down, the lower rod 32 is fixedly connected with the gate plate 2, and the upper rod 31 is connected with the lower rod 32. The top end of the bottom rod 32, i.e. the end away from the shutter 2, has a first accommodation area 321, the first accommodation area 321 is mounted with the elastic member 5 and the movable block 6, and preferably, the movable block 6 is also made of 06Cr19Ni10 material. When the movable block 6 of the present application is installed, first, a milling cutter is used to mill a groove with a rectangular cross section in the middle and semicircular cross sections at the center of the bottom end of the top rod 31 and the top end of the bottom rod 32, and the movable block 6 made of stainless steel 06Cr19Ni10 is placed therein. The bottom end of the top rod 31, that is, the end connected to the bottom rod 32, has a second receiving area 311, and the second receiving area 311 is used for receiving the movable block 6. When the elastic member 5 is in the first state, the top rod 31 and the bottom rod 32 are in a combined state, a part of the movable block 6 is accommodated in the first accommodating area 321, and another part of the movable block 6 is accommodated in the second accommodating area 311 to form a key fit between the bottom rod 32 and the top rod 31, and when a torque is applied to the top rod 31, the torque is transmitted to the bottom rod 32 through the key fit. When the elastic element 5 is in the second state, the top rod 31 and the bottom rod 32 are in a separated state, the movable block 6 is completely accommodated in the first accommodating area 321, the movable block 6 is not accommodated in the second accommodating area 311, the key fit between the bottom rod 32 and the top rod 31 disappears, the top rod 31 and the bottom rod 32 are relatively independent, and when torque is applied to the top rod, the torque cannot be transmitted to the bottom rod 32 through the key fit because the key fit disappears, and therefore the bottom rod 32 cannot rotate together with the top rod 31.

In a specific embodiment, as shown in fig. 2 to 5, the elastic element 5 includes a spring 51, the first accommodating area 321 includes a spring accommodating area 3211 and a moving block accommodating area 3212, the spring accommodating area 3211 is configured to accommodate the spring 51, the moving block accommodating area 3212 is configured to accommodate the moving block 6, and the spring accommodating area 3211 is located below the moving block accommodating area 3212. When the spring 51 is in the first compression state, under the action of the restoring force of the spring 51, the movable block 6 moves towards the top rod 31, and a key fit is formed between the bottom rod 32 and the top rod 31, at this time, the bottom of the spring 51 is located in the spring accommodation area 3211, and the top of the spring 51 is located in the movable block accommodation area 3212. When an external force acts on the movable block 6, the spring 51 is in a second compressed state, the movable block 6 is completely accommodated in the movable block accommodating area 3212, the spring 51 is completely accommodated in the spring accommodating area 3211, and the top rod 31 and the bottom rod 32 are in a separated state at this time. Of course, it is understood that instead of using the spring 51, other structures known in the art that can achieve the same thrust effect as the spring 51 can be used to ensure the solution implementation.

Further, the top bar 31 has a channel 312 extending through the top bar along the length direction thereof, and a top thread 313 is disposed in the channel 312, and the top thread 313 can move along the channel 312 under the action of an external force. The end face of one end of the jackscrew 313, which is far away from the movable block 6, is provided with a special-shaped boss 314, and the gate valve further comprises a special-shaped key matched with the special-shaped boss 314. In order to further improve the high reliability of use, the channel 312 is provided with a position adjusting part, the position adjusting part is in threaded fit or interference fit with the top thread 313, and when the top thread 313 is at the first position, the top rod 31 and the bottom rod 32 are in a combined state; when the top thread 313 is at the second position, the top rod 31 and the bottom rod 32 are in a separated state. When the special-shaped key is used, the special-shaped key is inserted into the channel 312 and matched with the special-shaped boss 314, the special-shaped key is rotated to overcome the friction force between the channel 312 and the jackscrew 313, or the special-shaped key is in threaded matching, so that the jackscrew 313 can be driven to move along the channel 312 to apply downward external force to the movable block 6, or the external force applied to the movable block 6 is removed, and then the movable block 6 is adjusted, so that key matching is formed, or the key matching is eliminated.

Further, the gate valve still includes valve gap 7, and valve gap 7 and valve body 1 fixed connection, valve gap 7 are cast by QT450 and are formed, preferably, all are provided with the screw thread mounting hole on valve gap 7 and the valve body 1, and valve gap 7 and valve body 1 form screw thread fastening connection through threaded connection spare such as bolt. More preferably, when the threaded connecting piece is selected, a countersunk screw or a countersunk bolt is selected; and a sealing ring is arranged between the valve body 1 and the valve cover 7 in the circumferential direction of the valve body 1. Through setting up valve gap 7, can guarantee to carry out the operation in-process to the gate valve, valve rod 3 remains central point all the time and puts not squint. The valve cover 7 and the valve body 1 together form a hollow accommodating chamber 14, and the guide groove 12 of the valve body 1 forms the bottom of the accommodating chamber 14 in the vertical direction in fig. 2 and 4. The bottom bar 32 is installed in the accommodating chamber 14, a bottom bar sealing portion 322 is formed at a top end of the bottom bar 32, that is, an end away from the shutter 2, and the first accommodating area 321 is disposed on the bottom bar sealing portion 322. The end surface of the top end of the bottom rod sealing portion 322 is provided with a bottom rod clamping portion 3221, and the bottom rod 32 is a cylindrical rod, so the bottom rod clamping portion 3221 is an annular structure protruding from the outer surface of the bottom rod 32 in the radial direction of the bottom rod 32. In order to install the bottom rod 32 conveniently, a corresponding installation structure is arranged on the valve cover 7, and specifically, the bottom rod clamping portion 3221 is in clamping fit with the end surface, far away from the valve body 1, of the valve cover 7. Preferably, in order to achieve effective sealing, the outer peripheral surface of the bottom rod sealing portion 322 and the inner wall surface of the bonnet 7 are sealingly connected by a plurality of O-rings 71. More preferably, three O-rings 71 are provided, and the O-rings 71 are rubber rings made of EPDM.

Further, as shown in the orientation shown in fig. 2 and 4, the gate valve further includes a gland 8 and a hexagonal copper nut 81, the gland 8 is disposed above the valve cap 7, and the hexagonal copper nut 81 is disposed above the gland 8, so as to ensure the installation reliability and safety of the entire gate valve. In order to facilitate the operation of the gate valve, a hand wheel 9 is disposed on the top of the top rod 31, an end of the channel 312 of the top rod 31 far away from the bottom rod 32 is provided with an internal thread, and the hand wheel 9 is detachably fixed on the top end of the top rod 31, that is, an end of the top rod 31 far away from the bottom rod 32, by a threaded fastener, such as a hand wheel bolt 91. The gate plate 2 can be driven to move up and down by rotating the hand wheel 9, and the operation is light and flexible; meanwhile, the hand wheel 9 is provided with a marked opening and closing direction mark to facilitate the operation of an operator according to the intention of opening and closing. The height of the gland 8 is increased, the contact length between the ejector rod 31 and the gland 8 is increased, and the stability of the ejector rod 31 is enhanced. The middle openings of the hexagonal copper nut 81 and the gland 8 are respectively provided with an O-shaped sealing ring, so that erosion of outside accumulated silt water, leakage water or sand dust and dust to the cavity is prevented, and a better sealing effect can be obtained by using the gland dustproof rubber cap in the prior art.

Fig. 2 and fig. 3 show that the top rod and the bottom rod are in a combined state in the present application, the top rod 31 is provided with a top rod clamping portion 315, the top rod clamping portion 315 is clamped with the clamping surface of the gland 8, the bottom rod 32 is provided with a bottom rod clamping portion 3221, and the bottom rod clamping portion 3221 is clamped with the end surface of the valve cover 7, which is far away from the valve body 1. Therefore, compare in prior art on the valve rod structure of cutting the groove and increasing the card, increased the diameter of the tip of ejector pin 31 and bottom bar 32 in this application, formed the joint structure, be equivalent to make an organic whole structure with the card among the prior art and valve rod to improve the whole mechanical strength of valve rod 3, strengthened the moment of torsion power of valve rod 3. Carry out the joint through the joint structure and connect, still help reinforcing location effect, easy to assemble has still compensatied the valve rod diameter reduction defect that causes behind the valve rod grooving, and has greatly improved the stability of valve rod 3, and valve rod 3 is opening and close the in-process, rotates around the center of valve rod 3 and does not have the skew, operates more nimble freely.

In addition, the O-shaped sealing ring on the gland in the prior art is removed in the application and is arranged between the outer peripheral surface of the bottom rod sealing part and the inner wall surface of the valve cover, so that a direct sealing effect is formed. The valve gap increases with the contact length of sill bar owing to remove the original recess that is used for installing the card, has sufficient length to be used for installing three O type sealing rings, has improved the whole sealed effect of gate valve.

As shown in fig. 2 and 3, in the gate valve of the present application, the jackscrew 313 is screwed up during assembly, and half of the movable block 6 is inserted into the pre-made groove of the top rod 31 and the other half is inserted into the pre-made groove of the bottom rod 32 under the elastic force of the spring 51 made of stainless steel of the movable block 6. The movable block 6 combines the ejector rod 31 and the bottom rod 32 together by key matching, when a hand wheel 9 is rotated or opened or closed, the ejector rod 31 rotates along with the hand wheel 9, the bottom rod 32 rotates in the same time by key matching connection of the movable block 6 and the ejector rod 31, the trapezoidal thread of the bottom rod 32 and the gate plate nut 4 wedged in the gate plate 2 are in thread transmission to drive the gate plate 2 to move up and down, the rotary motion of the hand wheel 9 is converted into the up-and-down linear motion of the gate plate 2, and therefore the opening and closing functions of the gate valve are achieved.

As shown in fig. 4 and 5, when the top rod 31 and the bottom rod 32 are separated to avoid an unrelated person operating the gate valve, after the hand wheel bolt 91 is screwed down, the matched special-shaped key extends into the special-shaped boss 314 aligned with the top of the top screw 313 from the bolt hole, the key is rotated clockwise by uniform force, the top screw 313 is screwed to prop against the movable block 6 to move downwards until the movable block 6 is separated from the groove of the top rod 31 and completely enters the groove of the bottom rod 32, the top rod 31 and the bottom rod 32 completely lose the key fit, and two valve rods 3 which can be relatively independent are formed. At the moment, the hand wheel 9 is rotated left or right, the hand wheel 9 can only drive the ejector rod 31 to rotate, the bottom rod 32 is always in a static state, namely the gate plate 2 is not opened or closed along with the rotation of the hand wheel 9, and the gate valve is effectively controlled.

When key matching is required to be formed again, and the gate plate 2 is controlled by rotating the hand wheel 9, the hand wheel bolt 91 is screwed down, a matched special-shaped key extends into the special-shaped boss 314 aligned with the top of the jackscrew 313 from the bolt hole, the key is rotated anticlockwise by uniform force, the jackscrew 313 retreats, meanwhile, the hand wheel 9 is rotated slightly, so that the groove of the ejector rod 31 is aligned with the shape of the movable block 6, the movable block 6 enters the groove of the ejector rod 31 under the acting force of the compressed spring 51, the movable block 6 further retreats along with the jackscrew 313 until half of the movable block 6 completely enters the groove of the ejector rod 31, the key matching of the ejector rod 31 and the bottom rod 32 is realized again, and the gate valve returns to a combined state.

Because the integral structure and the main body part of the existing gate valve are not changed too much, the original mold and the original template are still adopted in the production process of the casting, the cost for manufacturing the mold and the template is saved, and the original consistency is kept in the aspects of material consumption, energy consumption and labor cost of personnel. The production process and the technology do not need to invest, research, develop and pay, the existing mature smelting process is fully utilized, the yield of 98 percent of production efficiency and the qualification rate of 95 percent of casting quality are effectively guaranteed, and the requirements of the invention can be met. In the aspect of machining of castings, production equipment, tools, clamps and the like are fully considered in design, the equipment utilizes the concept of maximization, in the structural design, the original feasible structure is not changed and adjusted generally, the design with complex machining is avoided as much as possible, and the existing equipment can completely meet the technical and technological requirements of the innovation. In effect, no new processing equipment is added in the invention, and only small changes are made on the tooling of the part gland. The processing procedure and method still adopt the increasingly perfect technological process in the background technology production, have no influence on the proficiency of operators in the processing process, ensure the quality technical requirements of qualified parts and components, and provide the technical guarantee of quality connection for the integral qualification of products for assembling the concealed rod locking soft seal gate valve.

This application advances to divide into two sections with the valve rod on prior art, and little design change just makes current gate valve change from uncontrollable to controllable. In the aspect of mechanism design, the mechanism is simple, and only simple technical design and the spring and the movable block with low price are used, so that the excellent effect is realized. The production is basically consistent with the mature production in the prior art in the aspects of material cost, energy consumption, casting process and processing process.

Various tests were carried out under the guidance of "national urban construction industry Standard of the people's republic of China" (CJ/T216-2013) by using the gate valve in the present application. In the aspect of mechanical structure tests, repeated tests are carried out for many times according to standard strength test torque values and maximum function test torque values, and the gate valve meets the technical requirements of no damage and no deformation. In the aspect of a sealing test, according to the pressure value of a corresponding product of a standard, the test pressure value is increased intentionally, the specified 1.1-time rated pressure is gradually increased to 2-time rated pressure, and the time of more than 60 seconds is taken as a pressure maintaining test for 300 seconds. After the torque test and the pressure test, the work cycle test is carried out on special equipment, and after 5000 times of opening and closing action tests, the product is still intact and has no fault. The gate valve in this application compares with prior art from structural design's rationality to the practicality of product, from the manufacturing cost of product to the market demand of product, all lies in the leading position of trade product.

The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.

Claims

1. A non-rising stem locking soft seal gate valve comprises a gate plate and a valve rod fixedly connected with the gate plate, and is characterized in that the valve rod comprises a bottom rod fixedly connected with the gate plate and an ejector rod connected with the bottom rod along the length direction of the valve rod;

2. The dark bar locking soft seal gate valve of claim 1, wherein the resilient member comprises a spring, the first receiving area comprises a spring receiving area and a movable block receiving area;

3. The dark-bar locking soft seal gate valve according to claim 1 or 2, wherein the gate valve further comprises a valve body and a valve cover which are fixedly connected, the valve cover and the valve body together form a hollow accommodating cavity, the bottom bar is installed in the accommodating cavity, one end of the bottom bar, which is far away from the gate valve, is provided with a bottom bar sealing part, and the first accommodating area is arranged on the bottom bar sealing part;

4. The inside-out stem locking soft seal gate valve according to claim 3, wherein the outer peripheral surface of the bottom stem sealing portion is sealingly connected to the inner wall surface of the valve cover by a plurality of O-rings.

5. A dark rod locking soft sealing gate valve of claim 3, characterized in that, the valve body and the valve cover are connected tightly by screw thread, and a sealing ring is arranged between the valve body and the valve cover in the circumferential direction of the valve body.

6. The inside-locking soft seal gate valve according to claim 3, further comprising a gland connected to the valve cover, wherein the end of the gland connected to the valve cover has a clamping surface, the end of the top rod connected to the bottom rod has a top rod clamping portion, and the top rod clamping portion is clamped to the clamping surface of the gland.

7. The inside of the non-rising stem locking soft seal gate valve of claim 3, wherein a channel penetrating the top stem along the length direction of the top stem is arranged inside the top stem, a top thread is arranged in the channel, and the top thread can move along the channel under the action of external force;

8. The blind stem locking soft seal gate valve of claim 7, wherein the passageway has a position adjustment portion that is threaded or interference fit with a jackscrew;

9. The dark-bar locking soft seal gate valve of claim 7, further comprising a hand wheel, wherein the end of the channel distal from the bottom bar has internal threads, and the hand wheel is removably secured to the end of the top bar distal from the bottom bar by a threaded fastener.

10. The inside-out dark-bar locking soft seal gate valve according to claim 1 or 2, wherein said top bar, bottom bar and movable block are all made of 06Cr19Ni10 material.