WO2003046418A1

WO2003046418A1 - A reverse cut-off valve

Info

Publication number: WO2003046418A1
Application number: PCT/CN2002/000848
Authority: WO
Inventors: Hongfu Wang
Original assignee: Hongfu Wang
Priority date: 2001-11-26
Filing date: 2002-11-26
Publication date: 2003-06-05
Also published as: AU2002354329A1

Abstract

The present invention relates to a reverse cut-off valve which has superior properties of cut-off and seal and adjustment or throttling. With respect to the existing cut-off valve, a straight duct portion with lower portion open is additionally provided at the lower part of the valve body (4) of the present valve, and the valve clack (7) is disposed under the valve seat (5), the medium enters into the valve body from the bottom of the valve seat, the lower part of the valve seat can be made to have a shoulder, and a circle projection may be provided on the peripheral of the valve clack to protect the valve clack, the valve rod (9) has a cone body which can control pressure and outflow, and the present valve adopts six kinds of valve rod up-down sliding mechanisms in which the valve rod can't rotate. Thus, the wear of the relating parts is reduced and the service life is prolonged, while the present valve may meet the needs of hand-press, foot-stood, hydraulic rapid open and automatic close. With this construction, the present valve has many advantages of simple construction, low cost, no leak, saving water and material, no electrical consumption, rapid open and close, long service life, convenient installation and maintenance, wide applications and so on, it can also bring notable economical and social benefit.

Description

Technical field of the invention

The invention relates to a shut-off valve, in particular to a reverse opening and closing shut-off valve. It can be widely used to transport various liquids or gases in various fields of production and life, and is especially suitable for terminals and large-caliber, medium-, high- and ultra-high pressure occasions for pipelines of various media. BACKGROUND OF THE INVENTION

The globe valve has the advantages of reliable sealing performance, no need to disassemble the valve body for maintenance, convenient and labor-saving, etc. Therefore, it was once the most widely used valve in the field of production and life. Many throttle valves (valves that can roughly control the flow of the medium) and regulating valves (valves that strictly control the parameters such as the pressure and flow of the medium) are made by partially improving the shape of the shut-off disc. The existing cut-off valve and the throttle and regulating valve made from the improved cut-off valve have a structure in which the valve disc is above the septum and the valve seat, and the valve disc rises and opens, and it descends and closes. Lifting is accomplished by rotating the valve stem on the valve cover for multiple turns. This structure makes the valve time-consuming to open and close, and directly erodes the sealing surface of the valve disc when the medium is flowing, especially in the low-flow working state for throttling and adjustment, the high-speed flowing medium seriously erodes the valve sealing surface and seriously affects the valve. Seal and service life. Due to the above-mentioned shortcomings, in recent years, many domestic and foreign original use of globe valves, especially medium, large-caliber and high-end occasions, have switched to ball and gate valves, and the scope of use of globe valves has been rapidly reduced. However, the existing cut-off valves, ball valves, butterfly valves and plunger valves for regulating or throttling all directly attack the valve discs after opening. Until now, shut-off and regulating or throttle valves have been individually designed and used. In this way, on the one hand, in many occasions where adjustment or throttling is necessary, in addition to installing a regulating valve, a valve that functions as a cut-off seal needs to be installed. Not only is the investment increased, but it is also inconvenient to install and use. On the other hand, there are a lot of occasions where throttling and adjustment are needed. Because it is inconvenient to install two valves, only one valve is used, causing unnecessary loss of media. There are currently no long-life valves that have both good cut-off sealing and adjustment or throttling capabilities.

Existing large-diameter, medium-, high-, and ultra-high-pressure shut-off valves, gate valves, and ball valves are widely used in the opening and closing of electric, pneumatic, or hydraulic mechanisms. The size of the optional power mechanism is large, which greatly increases the volume, quality, equipment investment, installation and maintenance workload of the whole machine, especially all power mechanisms must use electricity, which increases the need for valves installed in the field. Power grids with large amounts of capital and installation and maintenance costs, and grid investments are often much higher than the equipment itself.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art described above, and provide an excellent cut-off sealing performance, as well as good adjustment or throttling. Flow performance, simple structure, low cost, rapid opening and closing , Long service life, applicable to a wide range of reverse on-off shut-off valves. The present invention adopts the following technical solutions to solve the above technical problems.

The reverse on-off and shut-off valve provided according to the present invention includes a valve cover, a valve body, a valve seat, a valve disc, a valve stem, and a valve stem lifting mechanism. A straight pipe portion with a lower end extending at the lower portion of the valve body extends. A cover plate is fixedly connected to the valve seat; the valve seat is arranged in the middle compartment of the valve body; the valve disc is arranged below the valve seat and is fixedly connected to the lower end surface of the valve stem; the valve stem lifting mechanism is a sliding lift The mechanism closes the valve when the valve disc is lifted up against the sealing surface of the valve seat, and the valve is fully opened when the valve disc is lowered into the straight pipe part at the lower end of the valve body, and the medium enters the valve body from below the valve seat.

The present invention can also adopt the following technical measures to further solve the above technical problems.

In the aforementioned reverse open / close valve, a seal is provided between the valve disc and the lower end surface of the valve stem.

In the foregoing reverse on-off shut-off valve, the lower part of the valve stem protruding into the valve seat is a cone capable of controlling the pressure and flow of the medium.

In the aforementioned reverse on-off shut-off valve, the valve seat has a circular annular shoulder at one end below the spacer layer in the valve body.

In the foregoing reverse on-off shut-off valve, the valve disc is a disc-shaped part having a circular boss.

In the foregoing reverse on-off shut-off valve, the valve rod sliding lifting mechanism includes two thrust ball bearings installed on the upper part of the bonnet bracket and one between the two bearings, and has a hand screwed to the upper end of the valve rod. Wheel consisting of lifting nuts.

In the aforementioned reverse on-off shut-off valve, the valve rod sliding lifting mechanism is composed of a compression spring mounted on the valve cover, and a pressure cylinder covering the spring and fixed on the upper end of the valve rod.

In the aforementioned reverse on-off shut-off valve, the valve stem sliding lifting mechanism comprises a compression spring mounted on the valve cover, and a cylinder provided on the valve cover and sheathed outside the compression spring, which can lift the cylinder wall by clamping the valve stem. The upper and lower sleeves are provided with two spiral grooves symmetrically and can rotate along two pins installed on the valve cover.

In the foregoing reverse on-off shut-off valve, the valve rod sliding lifting mechanism comprises a compression spring mounted on the valve cover, a compression cylinder surrounding the compression spring and fixed on the upper end of the valve rod, and a tie rod and a pedal connected thereto. Board composition.

In the foregoing reverse opening and closing shut-off valve, the valve stem sliding lifting mechanism is formed by a compression spring mounted on the valve cover, a pressure cylinder fixed on the valve stem, and a pressure cylinder installed on the valve cylinder and integrated with the valve cover. It consists of a hydraulic jack between the square I-brackets.

The present invention can also use the following another technical solution to solve the technical problem.

The reverse on-off and shut-off valve according to the present invention includes a valve cover, an angle valve body, a valve disc, a valve stem, and a valve stem lifting mechanism. The valve disc is disposed below the interlayer of the angle valve body, and communicates with the valve body. The lower end surface of the valve stem forms a whole; the valve stem lifting mechanism is a sliding lifting mechanism, which closes the valve when the valve disc is raised against the sealing surface of the valve seat, and the valve is fully opened when the valve disc is lowered into the straight pipe at the lower end of the valve body, and the medium is removed from the valve. Enter the valve body under the seat.

The aforementioned reverse on-off shut-off valve, wherein the stem extending to the lower part of the angled valve body is a cone that can control the pressure and flow of the medium; the valve flap is an inverted T-shape formed under the cone Step cylinder.

In the foregoing reverse on-off shut-off valve, a gasket is sleeved on the cylindrical portion of the stepped cylinder abutting the cone.

In the aforementioned reverse on-off shut-off valve, the valve stem sliding lifting mechanism is a sleeve that is sleeved on the upper end of the valve stem and lifts the valve stem and rotates on the external thread on the valve cover integrated with the angle valve body. Cylindrical lifting nut.

Compared with the prior art, the present invention has obvious advantages and positive effects. As can be known from the above technical solutions, the present invention replaces the valve disc under the valve seat, and allows the medium to enter the valve cavity from below the valve seat. In this way, when the valve is closed, the direction of the force of the shield is the same as the direction of the compulsory pressure to maintain the seal. That is, the force of the medium is completely converted into the compulsory pressure on the valve disc. Because the force area of the valve disc of the present invention is much larger than the existing globe valve, in most cases, the pressure of the medium is sufficient to maintain the valve seal without relying on it. When the stem is applied with additional pressure, it becomes a full self-sealing valve. Moreover, the compulsory pressure that the valve disc of the present invention can naturally increase with the increase of the pressure of the medium, and the increase of the pressure of the medium is slower than the artificial pressure. The dyke is gentle, so the invention not only seals reliably and can prevent accidental internal leakage (the valve body The leakage from the inlet end to the outlet end), and the pressure loss to the gasket is small, and the valve has a long service life. These advantages are of great significance in large-caliber, high-pressure, ultra-high-pressure, and used for storage and transportation of flammable and explosive, toxic and harmful shields. In addition, since the present invention is used at the end of a pipeline, when it is closed, it has a reliable self-pressure seal and no internal leakage. At this time, there is no medium at the outlet end and no external leakage (the leakage of the medium from the valve stem). When opened, although there is medium at the valve stem, the medium pressure has dropped to normal pressure. And at this time, there is no damage even if there is external leakage. So the invention used at the end of a pipeline is a veritable leak-free valve. When used in the terminal of pipelines that transport corrosive media, because only the inlet pipe section of the valve body cavity and the lower end face of the valve disc are immersed in the corrosive media for a long time, the vulnerable parts are greatly reduced, which obviously reduces the cost of anticorrosive treatment and improves the valve. Advantageous life.

The sealing surface of the valve seat in the present invention is a shoulder-shaped plane, and some valve discs are disc-shaped parts with a ring-shaped boss around them. This shape and structure can ensure that the sealing surface of the valve disc can not be directly eroded by the medium, and can extend the service life of the wide door. The cone body is manufactured at the corresponding part of the valve stem. Gap between cylindrical surfaces to control flow and pressure. In this way, the cut-off seal of the valve depends on the flat seal pair, and the adjustment of pressure and flow is accomplished by adjusting the gap between the cylindrical surface of the inner hole of the valve seat and the cone on the valve stem. The two work independently without interference. Therefore, the valve's cut-off seal and regulating throttling functions are very superior, and the valve has a long service life.

The invention adopts six types of valve stem sliding lifting mechanisms with non-rotating valve stems, which not only greatly reduces the wear of the valve stem and sealing packing, but also reduces the wear of the valve flap or seal pad, which prolongs the valve life and reduces the maintenance workload.压缩 The valve is closed quickly and automatically with a compression spring automatic switch structure. Never leak, save the media being transported. The hand pressing, lever and spiral groove opening structure simplify the multi-turn rotating opening structure into vertical pressing or rotary opening within half a turn, making the operation simple and convenient. The pedal opening mechanism can be opened without hands and used in public places such as bathrooms, hospitals, station squares, etc. It has the advantages of saving investment, saving water, preventing disease transmission, convenient use and maintenance, and long life. The hydraulic jack opening structure is used in large-caliber, medium, high and ultra-high pressure applications. It has a simple structure, easy operation and labor saving, small valve size and mass, small footprint, low investment, no electricity, wide application, and many other advantages. Both economic and social benefits are very significant.

To sum up, the present invention has significant improvements in structure and function in areas where the space for technological development is limited, and has made great progress in technology, and has produced useful and practical Effect, and indeed has an enhanced effect, so that it is more suitable for practical use, and is a new, progressive, and practical new invention.

The specific structure of the present invention is given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a basic structure of the present invention.

FIG. 2 is a schematic structural diagram of an angle globe valve with a simpler structure according to the present invention.

FIG. 3 is a schematic structural diagram of the present invention with a manual pressure opening and automatic closing.

Fig. 4 is a structural schematic diagram of the present invention with a spiral groove opened and closed.

Fig. 5 is a schematic structural diagram of the present invention with a foot-opening automatic switch.

Fig. 6 is a schematic structural diagram of the present invention when the hydraulic jack opens and closes automatically.

In the picture:

1. Handwheel 2. Lifting nut 3. Valve cover 4. Valve body

5, valve seat 6, gasket 7, valve disc 8, cover plate

9, valve stem 10, key 11, bearing 12, cylindrical lifting nut

13.Angle valve body 14.Pressure cylinder 15.Compression spring

16, Lifting sleeve with spiral groove 17, Pin 18, Tie rod

19. Foot pedal 20. Hydraulic jack 21. Valve cover with frame bracket

The specific structure, features, and effects of the present invention will be described in detail below with reference to the drawings and preferred embodiments.

As shown in FIG. 1, the valve body 4 of the present invention extends a straight pipe portion with a lower end opening from the lower end of the existing shut-off valve, and a cover plate 8 is installed on the pipe mouth. The function of adding this straight pipe portion is for the valve seat 5 and the valve. The flap 7 and the valve stem 9 are installed from below to leave a passageway, and at the same time, there is a space for the flap to drop when the valve is opened, so as to prevent the flap from affecting the shield flow. A ring-shaped valve seat 5 with a shoulder is mounted on the valve body 4 from the bottom up, and the valve disc 7 and an additional gasket 6 if necessary are fixed to the valve stem 9 to fix the assembly. The valve body 4 is inserted from the bottom to the top, and then the sealing packing is installed in sequence, the packing gland, the key 10, the bearing 11, the lifting nut 2 and the hand wheel 1 are installed, and finally the cover plate 8 is installed. Figure 1 shows the closed state of the valve. When the valve is opened, turning the handwheel 1 drives the valve stem 9 down, the valve gradually opens, and the valve flap 7 is lowered into the straight pipe part at the lower end of the valve body 4, which does not affect the valve fully open when the medium flows. The handwheel 1 reverses the valve to close.

As shown in FIG. 2, the present invention has a simpler angle structure. Compared with the basic invention of FIG. 1, the small-sized valve has a small lifting force, so the handwheel, bearing, key and valve cover are omitted. Instead, a cylindrical lifting nut 12 can be rotated on the valve body 4 to hold the valve stem up and down. In order to reduce costs and facilitate processing, the valve stem 9 and the valve disc 7 are integrated to form a valve stem 9 with a valve disc. At the same time, the valve disc has no protection ring, and the valve seat is machined directly on the valve body. Due to the special needs of the angle valve, the valve body 4 is changed to a three-way tube. Other structures, assembly methods, and working principles are all the same as those shown in Figure 1. the same. This simplified structure of the reverse opening and closing shut-off valve sliding lift mechanism has a thread on the outer periphery of the valve body. The thread size of the thread is more than double that of the existing shut-off valve, and the external thread can be lubricated and rust-proof, so it is used for It replaces the existing small-scale shut-off valve commonly known as faucet, which can not only prevent accidental leakage, safety and water saving, but also can last 5 times or even 10 times longer than the existing faucet, so the economic and social benefits are very significant.

As shown in FIG. 3, in the present invention of the manual pressure opening and automatic closing type, a compression spring 15 is installed on the valve cover 3, the compression cylinder 14 is sleeved on the compression spring, and the valve stem 9 is fixed with a nut. The function of the pressure cylinder 14 is to transmit pressure to the valve stem and cover the compression spring, so that the product is beautiful and applicable. When opening the valve, press the cylinder 14 by hand, and the cylinder 14 can slide the valve stem downward. As soon as the human hand leaves the cylinder, the extension tension of the compression spring 15 will automatically close the valve even if the valve stem rises. Gasket 6, valve disc 7 is fixed to the valve stem with a screw. This structure makes it easy to replace the gasket, which can double the valve's service life.

As shown in FIG. 4, the spiral groove opening and closing type of the present invention has an opening structure in which two spiral rising grooves are symmetrically opened back and forth on a sleeve capable of lifting a valve rod to form a lifting sleeve 16 with a spiral groove. Two screw holes are machined at appropriate positions of the valve cover 3. After the compression spring 15 is installed on the valve cover 3, the lifting sleeve 16 with a spiral groove is sleeved on the compression spring 15, and the lifting sleeve 16 with a spiral groove is pressed down, so that the spiral groove is aligned with the screw hole on the valve cover 3. Twist the two pins 17 into the screw holes. During operation, the lifting sleeve 16 with a spiral groove is pressed to rotate clockwise, so that the lifting sleeve 16 with a spiral groove is lowered to the highest point of the spiral groove, and the wide door is opened to the maximum flow rate. Rotate counterclockwise to lift the lifting sleeve 16 with the spiral groove to the lowest point of the spiral groove, and the valve is closed. 'The lifting sleeve 16 with a spiral groove is stopped when it is stopped in a semicircular groove in the middle position. This valve simplifies basic multi-turn on-off to half-turn on-off.

As shown in FIG. 5, the present invention of a pedal-opening and automatic-closing type has most of the same structure as the basic type shown in FIG. 1 and the manual-pressing automatic-closing type described in FIG. 3, except that the pressure cylinder 14 and the tie rod are different. 18 · Connected to foot pedal 19, the pedal valve of human foot is opened, it will be automatically shut down. Such valves are used in bathrooms, and public places such as hospitals, entertainment venues, institutions, factories, mines, and stations, which can effectively eliminate the phenomenon of often forgetting to close and inadequately closing the valve, which wastes a lot of water, and can reduce disease transmission. ·

As shown in FIG. 6, the hydraulic jack opening and closing type of the present invention has most of the same structure as the basic type shown in FIG. 1 and the manual pressure opening and closing type shown in FIG. 3. The difference is that the valve cover is a There is a valve cover 21 with a frame bracket on the upper side, and a hydraulic jack 20 is installed between the upper frame of the frame of the valve cover 21 with the frame bracket and the pressure cylinder 14. When the hydraulic jack 20 is raised, the pressure cylinder can be lowered and the valve is opened. Open the pressure relief hole of the hydraulic jack 20 and the compression spring 15 rebounds to force the cylinder to rise and close the valve.

This is because the area of the valve disc in the present invention is more than 50% larger than that of the existing cut-off valve, and the cut-off pressure on the valve disc when closed is more than 50% greater than that of the existing cut-off valve. This force is the main resistance to be overcome when opening the valve. Obviously, the opening of the present invention is much more difficult. The current electric opening method requires the use of a motor with a much larger power and a corresponding large-size reducer, which increases the volume and weight of the whole machine, increases investment, and increases the use and maintenance costs. . However, according to the present invention, it is difficult to open, but easy to close (the valve only needs to overcome the friction between the valve disc and the packing and the gravity of the valve disc) and the characteristics of the valve disc lowered to open. The hydraulic jack is used to open, and the compression spring rebounds automatically to close. The structure can make the whole machine simple in structure, small in size and mass, easy to operate and use no electricity, so its application value and economic and social benefits are very significant.

The above description is only the preferred embodiments of the present invention, and any form, equivalent change, or modification of the present invention is not included in the scope of the technical solution of the present invention. '^'

Claims

Request for Rights

1. A reverse opening and closing cut-off, including a valve cover (3), a valve body (4), a valve seat (5), a valve disc (7), a valve stem (9) and a valve stem lifting mechanism, which is characterized by : At the lower part of the valve body (4) there is a straight pipe section with a lower end open. And a cover plate (8) is fixedly connected thereto; the valve seat ( ⁵ ) is arranged in the middle compartment of the valve body (4); the valve disc (7) is arranged below the valve seat (5) and is connected with the valve stem (9) The lower end faces are fixedly connected together; the valve stem lifting mechanism is a sliding lifting mechanism, so that the valve disc

(7) The valve closes when the valve seat (5) seals up and closes, and the valve disc (7) drops to the inside of the straight pipe part of the lower end of the valve body (4), and the valve is fully open, and the medium is from under the valve seat (5) Enter the valve body (4).

2. The reverse on-off and shut-off valve according to claim 1, characterized in that: a gasket (6) is provided between the valve disc (7) and the lower end surface of the valve stem (9).

3. The reverse on-off and shut-off valve according to claim 2, characterized in that: the lower part of the valve stem (9) protruding into the valve seat (5) is a cone capable of controlling the pressure and flow of the medium.

4. The reverse on-off shut-off valve according to claim 3, characterized in that: one end of the valve seat (5) below the spacer layer in the valve body has a circular annular shoulder.

5. The reverse on-off and shut-off valve according to claim 1, 2, 3 or 4, characterized in that: the valve disc (7) is a disc-shaped part having a circular boss.

6. The reverse on-off and shut-off valve according to claim 5, characterized in that: the valve stem sliding lifting mechanism comprises two thrust ball bearings (11) installed on the upper part of the bonnet (3) bracket and one mounting Between the two bearings, a lifting nut (2) with a hand wheel (1) is screwed to the upper end of the valve stem.

7. The reverse on-off and shut-off valve according to claim 5, characterized in that: the valve rod sliding lifting mechanism comprises a compression spring (15) mounted on the valve cover (3), and a spring enclosing the spring It is composed of a pressure cylinder (14) fixed on the upper end of the valve stem (9).

8. The reverse on-off shut-off valve according to claim 5, characterized in that: the valve stem sliding lifting mechanism comprises a compression spring (15) mounted on the valve cover (3), and a valve cover The upper sleeve is set on the outside of the compression spring, which can lift the valve stem, and its barrel wall is symmetrically provided with two spiral grooves and can be rotated along two pins (17) installed on the valve cover. Sleeve

(16) Composition.

9. The reverse on-off and shut-off valve according to claim 5, characterized in that the valve stem sliding lifting mechanism comprises a compression spring (15) mounted on the valve cover (3), and a compression spring enclosing the compression spring. The pressure cylinder (14) fixed on the upper end of the valve stem (9) is composed of a tie rod (18) and a foot plate (19) connected thereto.

10. The reverse on-off and shut-off valve according to claim 5, characterized in that: the valve stem sliding lifting mechanism comprises a compression spring (15) installed on the valve cover (3), and a valve stem ( 9) the pressure cylinder (14) and a pressure cylinder (14) installed on the cylinder It consists of a hydraulic jack (20) between the frame-shaped brackets (21).

11. A reverse on-off shut-off valve, including a valve cover (3), an angle valve body (13), a valve disc (7), a valve stem (9), and a valve stem lifting mechanism, characterized in that: the valve disc ( 7) It is arranged below the interlayer of the angle valve body (12), and forms a whole with the lower end surface of the valve stem (9); The valve stem lifting mechanism is a sliding lifting mechanism, so that the valve disc (7) is lifted and tightly attached When the valve seat (5) seals, the valve is closed. When the valve disc (7) is lowered into the straight part of the lower end of the valve body (4), the valve is fully open, and the medium enters the valve body (4) from below the valve seat (5).

12. The reverse on-off and shut-off valve according to claim 11, characterized in that: the valve stem (9) extends to the lower part of the middle compartment of the angle valve body (12) to control the pressure and flow of the medium The cone (7) is an inverted T-shaped stepped cylinder (12) formed under the cone.

13. The reverse on-off and shut-off valve according to claim 12, characterized in that: a sealing gasket (6) is sleeved on the cylindrical portion of the stepped cylinder abutting the cone.

14. The reverse on-off and shut-off valve according to claim 11, 12, or 13, characterized in that: the valve rod sliding lifting mechanism is a sleeve which is sleeved on the upper end of the valve rod (9), and is lifted by the valve rod. Cylindrical lifting nut rotating on the external thread on the bonnet integrated with the angle valve body (12)

(12).