CN105508627A - High-pressure pipeline manual balance type valve - Google Patents

Abstract

The invention discloses a high-pressure pipeline manual balancing valve, which mainly includes a valve body, a valve cover, a large valve rod, a packing gland, a valve disc, a piston, a small valve core, a spring, a piston snap ring and a hand wheel. The present invention utilizes the balance cavity formed by the valve port on the top of the valve body and the piston to balance the fluid pressure, reduces the driving force of the valve adjustment assembly, and facilitates the opening and closing of the valve. Solve the problem of fluid flowing from the high-pressure area to the balance chamber; install the piston snap ring and the cone valve pin in the middle of the large valve stem, so that the cone valve pin installed on the piston snap ring cooperates with the taper pin hole on the piston to open and close state, it plays the role of accumulating and releasing pressure for the balance chamber. The valve body of the present invention adopts a balanced structure, which reduces the opening and closing force of the valve, has the advantages of small opening and closing torque, reliable sealing, stable working performance, etc., can adapt to various operating environments, and is simple and convenient to operate.

Description

A high-pressure pipeline manual balance valve

technical field

The invention belongs to the field of cut-off valves, and more specifically relates to a manual balancing valve of a high-pressure pipeline.

Background technique

As an indispensable control unit in fluid control systems, valves are widely used in the production and development of various industries. Valve control is ubiquitous in oil exploration, natural gas transportation, hydraulic management systems, chemical manufacturing, and pharmaceutical production systems; in power generation industries such as hydropower, thermal power, and nuclear power; and in various transportation equipment such as vehicles, ships, and aircraft. Especially in the high-tech fields of national defense, various special valves are used in navigation, aviation and aerospace.

In the industrial automation fluid control system, the stop valve is one of the widely used fluid control equipment, which is used to connect or cut off the medium. There are many types of globe valves, mainly straight-through globe valves, right-angle globe valves and straight-through oblique globe valves. The valve of the present invention is an extremely important cut-off valve, and the valve is opened and closed by applying torque to the valve stem to connect or cut off the medium.

When the working pressure of the existing globe valve reaches above 3.5MPa and the diameter DN is greater than 100mm, it is very difficult to open the valve purely manually, and an additional force arm is required to open it smoothly, but these irregular operations will inevitably cause certain damage to the valve , greatly reducing the service life of the valve. Therefore, there is an urgent need and application value to develop a high-pressure and large-bore manual balancing structural valve.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the present invention proposes a balanced structure, which can reduce the opening and closing force of the valve, has the advantages of small opening and closing torque, reliable sealing, stable working performance, etc., and can adapt to A variety of operating environments, easy to operate manual balancing valve for high-pressure pipelines.

The manual balancing valve for high-pressure pipelines provided by the present invention is characterized in that it includes a valve body, a valve cover, a large valve stem, a packing gland, a valve disc, a piston, a small valve core and a hand wheel, wherein:

The bottom of the valve body is provided with an inlet cavity, its side is provided with an outlet cavity, and its top is provided with a top valve port;

The large valve stem includes a disc-shaped valve disc at the bottom, and a round rod-shaped valve handle is fixedly connected to the middle of the valve disc; the valve handle is opened from the bottom where the valve disc connects upwards to the top of the piston. There are several drainage grooves; a cylindrical notch is opened above the drainage groove;

The valve cover is fixed on the top valve port of the valve body to seal the valve cavity; the circular through hole in the middle of the piston passes through the valve handle in the middle of the large valve stem, and the bottom of the piston is fixedly connected with the top of the disc; the large valve stem The valve disc at the bottom enters into the top stepped hole of the valve clack, the diameter of the bottom of the stepped hole is larger than the outer diameter of the valve disc, and the valve disc can move up and down in the cavity formed by the bottom of the piston and the valve clack;

The small valve core includes a diversion plate, a spring and a small valve stem. The diversion plate is located in the top stepped hole of the valve disc, forming a cavity with the stepped hole and the small valve stem; the small valve stem passes through the drainage hole at the bottom of the valve disc. , which is threadedly connected with the diversion plate; the spring is embedded between the diversion plate and the bottom of the disc to maintain proper tension; the outer diameter of the small valve stem is smaller than the inner diameter of the drainage hole at the bottom of the disc, and there is a bonnet on the small valve stem, whose outer diameter is larger than The inner diameter of the drainage hole; the drainage plate has a drainage hole;

When working, rotate the handwheel, the large valve stem moves downward, overcomes the tension of the spring, presses down the small valve stem on the small valve core, moves down the bonnet on the small valve stem, and opens the drainage hole at the bottom of the disc; continue Rotate the handwheel, and the integrated piston, valve disc and small valve core move downward; the fluid medium is led out from the drainage hole at the bottom of the valve disc, through the drainage hole on the drainage plate and the drainage groove on the large valve stem, reducing The fluid medium pressure at the inlet.

Further, the manual balancing valve of the high-pressure pipeline is characterized in that it also includes a balancing chamber;

The balance chamber includes a valve port at the top of the valve body, a piston snap ring, a cone valve pin and a piston, wherein:

The piston snap ring takes the large valve stem as the center of the circle, and is fixed on the cylindrical notch on the large valve stem; the piston snap ring is symmetrically opened with a plurality of through holes around the center of the circle, and the upper part of the piston has a The matching tapered pin hole, the cone valve pin is fixed in the through hole on the piston snap ring, and the pin head can enter and exit the tapered pin hole of the piston; the top of the piston is provided with a circular groove whose diameter is larger than that of the piston The outer diameter of the snap ring, the piston snap ring can move up and down in it driven by the large valve stem; the downward limit position of the piston snap ring is the place where the conical surface of the middle part of the cone valve pin is closely matched with the conical pin hole of the piston, and the upward limit is not Beyond the bottom of the bonnet, the total stroke is the same as the up and down stroke of the valve disc;

When the valve needs to be opened, turn the hand wheel, the large valve stem moves downward, and the pin head of the cone valve pin fixed on the piston snap ring moves downward toward the pin hole on the matching piston until the taper pin in the middle of the cone valve pin The surface tightly covers the tapered pin hole of the piston to realize the pressure accumulation of the balance chamber; when the valve needs to be closed, turn the hand wheel, the large valve stem moves upward, and the pin head of the cone valve pin fixed on the piston snap ring moves upward. Until the tapered surface in the middle of the cone valve pin is completely separated from the tapered pin hole of the piston, the pressure relief of the balance chamber is realized.

Further, in the manual balance valve of the high-pressure pipeline, a circular groove is opened on the upper part of the valve cover, and a packing gland is arranged on it, and the space between the circular groove and the packing gland is provided with The stuffing box seals it.

Further, in the manual balancing valve of the high-pressure pipeline, the valve body, valve disc and valve cover are made of silicon brass.

Further, in the manual balancing valve of the high-pressure pipeline, the large valve stem and the piston are made of aluminum bronze.

Further, in the manual balancing valve of the high-pressure pipeline, the stuffing gland is made of manganese brass.

Further, in the manual balance valve of the high-pressure pipeline, the sealing surface of the disc and the sealing surface of the valve body form a conical hard seal, the sealing surface of the disc and the sealing surface of the piston form a hard seal of a metal gasket, and the valve port on the top of the valve body The sealing surface and the sealing surface of the bonnet form a metal gasket hard seal.

The present invention has the following technical characteristics:

1. The present invention utilizes the balance cavity formed by the valve port on the top of the valve body and the piston to balance the fluid pressure, which reduces the driving force of the valve adjustment component and facilitates the opening and closing of the valve.

2. In the present invention, the structure of the large valve stem is designed as a multi-drainage groove structure, which is rationally arranged on the lower circumference of the large valve stem, which can effectively solve the problem of fluid flowing from the high-pressure area to the balance chamber.

3. The present invention installs the piston snap ring and the cone valve pin in the notch in the middle of the large valve stem. When the valve stem moves up and down, the piston snap ring moves accordingly, so that the cone valve pin installed on the piston snap ring and the cone hole on the piston In the open state and closed state, it plays the role of accumulating and releasing pressure for the balance chamber.

4. The present invention is mainly composed of four parts in terms of sealing: ①The conical surface hard seal composed of the disc sealing surface and the valve body sealing surface; ②The metal gasket hard seal composed of the valve disc sealing surface and the piston sealing surface; ③The valve body The top valve port sealing surface and the bonnet sealing surface are composed of a metal gasket hard seal; ④The large valve stem is sealed with the stuffing box with relative moving parts.

5. The present invention adopts two-stage hard sealing, which overcomes the problem of leakage when simultaneous sealing is required; when the valve is opened, the large valve stem pushes down the integrated piston, valve disc and small valve core to make the valve disc seal The surface is separated from the sealing surface of the valve body, and the valve is opened. At this time, the valve plays the role of connecting the medium in the pipeline. When the valve is closed, the large valve stem pulls upward the connected piston, valve disc and small valve core, and applies force in the opposite direction, so that the sealing surface of the valve disc and the sealing surface of the valve body are tightly sealed to achieve the state of closing the valve. At this time, the valve It plays the role of cutting off the medium in the pipeline.

Generally speaking, the above technical scheme conceived by the present invention mainly possesses the following technical advantages:

1. The valve adjustment assembly of the present invention adopts a two-stage hard seal structure, which can effectively improve the sealing problem when the valve is opened and closed, and avoid the problem of poor sealing when sealing at the same time.

2. In the present invention, the top valve port of the valve body and the piston form a pressure balance chamber, which makes the pressure of the upper and lower chambers of the valve approximately balanced, reduces the driving force of the valve opening and closing, and is beneficial to the energy saving of the system.

3. The invention requires small opening and closing torque for the valve, adapts to various operating environments, and is simple and convenient to operate.

Description of drawings

Fig. 1 is a schematic view of the overall structure of the valve of the present invention;

Fig. 2 is a schematic structural view of the valve regulating assembly of the present invention;

Fig. 3 is a schematic group diagram of the structure of valve disc, large valve stem, piston and small valve stem of the present invention;

Fig. 4 is a structural schematic diagram of a fully closed state of the valve of the present invention;

Fig. 5 is a schematic structural view of the open state of the small valve stem of the valve of the present invention;

Fig. 6 is a structural schematic diagram of the fully opened state of the valve of the present invention;

In all drawings, the same reference numerals are used to represent the same elements or structures, among which: (1) valve body, (2) small valve stem, (2-1) valve cap, (3) valve disc, ( 3-1) Disc stepped hole, (3-2) Disc drainage hole, (4) Drain plate, (5) Large valve stem, (5-1) Large valve stem disc, (5-2) Large valve Stem stem, (5-3) Large stem drain groove, (5-4) Large stem notch, (6) Washer, (7) Screw, (8) Piston, (8-1) Piston through hole, (8-2) Piston tapered pin hole, (9) Cone valve pin, (10) Piston snap ring, (11) Nut, (12) Bolt, (13) Flat washer, (14) Spring washer, (15) Bonnet, (16) packing gland, (17) hand wheel, (18) nut, (19) pin, (20) pin shaft, (21) cotter pin, (22) stuffing box, (23) metal gasket , (24) spring.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail in conjunction with accompanying drawings 4, 5 and 6 below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

A manual balance valve for high-pressure pipelines of the present invention has the following two key points in its invention and design: one is to design the structure of the balance chamber of the valve body, and the piston as the pressure-resistant wall of the balance structure plays a vital role in the balance. Function, the design of the piston balance chamber and the valve body as one body is conducive to processing and reducing costs; the second is to design the valve adjustment component, which can effectively solve the problem of valve sealing reliability and realize the opening and closing of the valve smoothly.

The concrete assembly work process of valve of the present invention is as follows:

1. Assembly of valve adjustment components (including disc 3, small valve stem 2, spring 24, diversion plate 4, large valve stem 5, piston 8, piston snap ring 10, cone valve pin 9, etc.)

First place the spring 24 between the drain plate 4 and the stepped hole 3-1 of the valve disc 3, and then connect the small valve stem 2 through the drain hole 3-2 of the valve disc 3 to the drain plate 4; 10 is fixed in the cylindrical notch 5-4 on the large valve stem 5, and then the cone valve pin 9 is installed on the piston snap ring 10, and cooperates with the cone pin hole 8-2 on the piston 8, and the large valve The rod 5 passes through the piston through hole 8-1, and then it is fixedly connected to the top of the valve disc 3 together.

2. General assembly of the valve body (including valve adjustment components, valve body 1, valve cover 15, packing gland 16, hand wheel 17, etc.)

First fix the valve body 1, then pass the valve adjustment components through the valve port at the bottom of the valve body 1 in sequence, then pass the valve cover 15 through the large valve stem 5 and fix it on the top of the valve body 1, and seal it with the top valve port; secondly , put the stuffing box 22 into the stuffing box cavity, and seal it through the stuffing gland 16; finally, install the handwheel 17 on the top of the large valve stem 5 to complete the general assembly of the valve body.

The specific opening and closing process of the valve of the present invention is as follows:

1. Valve opening process

1) The state before the valve is opened: the valve is in the closed state. The cone valve pin 9 is separated from the sealing surface of the tapered pin hole 8-2 of the piston 8, and the tapered pin hole 8-2 of the piston 8 is in an open state. The lower part of the valve disc 3 is a high-pressure fluid medium, the sealing surface of the valve disc 3 is closely matched with the valve body 1, and the sealing surface of the bottom of the valve disc 3 is closely matched with the small valve stem 2 of the small valve core. At this point, the valve is fully closed.

2) Opening process: turn the hand wheel 17 to provide power for the large valve stem 5. The large valve stem 5 first overcomes the pressure of the external fluid medium and moves downward along the through hole 8-1 of the piston 8. At this time, the driving force only needs to overcome the pressure of the fluid medium. The pressure generated by the medium on the cross-sectional area of the valve cap 2-1 at the lower end of the small valve stem 2 of the small valve core. This movement makes the sealing surface of the lower end of the small valve stem 2 of the small valve core and the sealing surface of the bottom of the valve disc 3 open, and the fluid medium enters the piston 8 sequentially along the drainage plate 4 of the small valve core and the drainage groove 5-3 of the large valve stem 5. balance cavity. The downward movement of the large valve stem 5 drives the cone valve pin 9 on the fixed piston snap ring 10 to move downward, sealing the piston cone pin hole 8-2, preventing the external high-pressure fluid medium from being introduced into the balance chamber from depressurizing. During the opening process, the fluid medium acts on the upper surface of the piston 8 to generate a downward force, which balances the upward force generated by most of the external high-pressure fluid medium on the valve disc 3 . The large valve stem 5 moves downward continuously, pushing the piston 8, the valve disc 3 and the small valve core downward until the valve is fully opened. As shown in Figure 5 and 6.

2. Valve closing process

1) The state before closing the valve: the valve is in the open state. The pressure of the fluid medium in the lower part of the disc 3 is slightly higher than the pressure of the fluid medium in the upper part. The sealing surface of the valve cap 2-1 at the lower end of the small valve stem 2 of the small valve core and the sealing surface at the bottom of the disc 3 are in an open state, while the cone valve pin 9 and the piston cone pin hole 8-2 are in a closed state. At this time, the balance chamber The internal and external fluid medium pressures are approximately the same.

2) Closing process: turn the hand wheel 17 to provide power for the large valve stem 5, and the large valve stem 5 drives the integrated valve disc 3 and piston 8 to move upward. -1 The sealing surface and the sealing surface at the bottom of the disc 3 may be in an open or closed state, therefore, the fluid medium in the balance chamber either flows out from the drainage groove 5-3 of the large valve stem 5 or flows out through the piston tapered pin hole 8-2 . After the sealing surface of the disc 3 and the sealing surface of the valve body 1 are contacted and sealed, the large valve stem 5 continues to move upward until the sealing surface of the lower end of the small valve stem 2 of the small valve core 2-1 and the sealing surface of the bottom of the disc 3 are completely sealed. At this time, the cone valve pin 9 is separated from the sealing surface of the piston tapered pin hole 8-2, and the piston tapered pin hole 8-2 is in an open state. At this time, the balance chamber communicates with the pipeline in the low-pressure area, so that the low-pressure fluid medium acts on the outer surface of the piston 8, and the external high-pressure fluid medium acts on the lower surface of the valve disc 3, and the two generate a large upward force to push the valve disc. 3 and the small valve stem 2, so that the sealing surfaces at the two places get better sealing effect. As shown in Figure 4.

The high-pressure pipeline manual balancing valve in this embodiment mainly includes a valve body 1, a valve cover 15, a large valve stem 5, a packing gland 16, a valve disc 3, a piston 8, a small valve core and a hand wheel 17. Use the balance cavity formed by the top valve port of the valve body 1 and the piston 8 to balance the fluid pressure, reduce the driving force of the valve adjustment component, and facilitate the opening and closing of the valve; the structure of the large valve stem 5 is designed as multiple drainage grooves 5- 3 structure, and rationally arranged on the circumference of the lower part of the large valve stem 5, which can effectively solve the problem of fluid flowing from the high pressure area to the balance chamber; install the piston snap ring 10 and the cone valve pin 9 in the middle of the large valve stem 5, so that it can be installed on the piston snap ring The taper valve pin 9 on the 10 and the taper pin hole 8-2 on the piston 8 are in an open state and a closed state, which can play the role of accumulating and releasing pressure for the balance chamber. The valve body of the present invention adopts a balanced structure, which reduces the opening and closing force of the valve, has the advantages of small opening and closing torque, reliable sealing, stable working performance, etc., can adapt to various operating environments, and is simple and convenient to operate.

As an option, the valve body 1, valve disc 3 and valve cover 15 can be made of silicon brass. The large valve stem 5 and the piston 8 are made of aluminum bronze. The packing gland 16 is made of manganese brass.

As an option, the sealing surface of the valve disc 3 and the sealing surface of the valve body 1 form a conical hard seal. The sealing surface of the disc 3 and the sealing surface of the piston 8 form a metal gasket hard seal. The sealing surface of the valve port at the top of the valve body 1 and the sealing surface of the valve cover 15 form a metal gasket hard seal. Adopting two-stage hard sealing can overcome the problem of leakage when simultaneous sealing is required.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (9)

1. A high-pressure pipeline manual balancing valve is characterized in that it comprises a valve body (1), a valve cover (15), a large valve stem (5), a packing gland (16), a valve disc (3), Piston (8), small spool and handwheel (17), wherein: The bottom of the valve body (1) is provided with an inlet cavity, its side is provided with an outlet cavity, and its top is provided with a top valve port; The large valve stem (5) includes a disc-shaped valve disc (5-1) at the bottom, and a round rod-shaped valve handle (5-2) is fixedly connected in the middle of the valve disc (5-1); 2) From the connection between the bottom and the valve disc (5-1) up to the section matching the top of the piston (8), there are several drainage grooves (5-3) in the circumferential direction; There are cylindrical notches (5-4); The valve cover (15) is fixed on the top valve port of the valve body (1) for sealing the valve cavity; the circular through hole (8-1) in the middle part of the piston (8) passes through the middle part of the large valve stem (5) The valve handle (5-2), the bottom of the piston (8) is fixedly connected with the top of the valve disc (3); the valve disc (5-1) at the bottom of the large valve stem (5) enters the top stepped hole of the valve disc (3) In (3-1), the diameter of the bottom of the stepped hole (3-1) is larger than the outer diameter of the valve disc (5-1), and the valve disc (5-1) can be formed at the bottom of the piston (8) and the disc (3). move up and down in the cavity; The small valve core includes a diversion plate (4), a spring (24) and a small valve stem (2), and the diversion plate (4) is located in the top stepped hole (3-1) of the valve disc (3), and the stepped hole (3-1) and the small valve stem (2) form a cavity; the small valve stem (2) passes through the drainage hole (3-2) at the bottom of the valve disc (3), and is fixedly connected with the drainage plate (4) thread; the spring ( 24) Embedded between the drainage plate (4) and the bottom of the valve disc (3), maintain proper tension; the outer diameter of the small valve stem (2) is smaller than the inner diameter of the drainage hole (3-2), and there is a valve on the small valve stem (2). A cap (2-1), the outer diameter of which is greater than the inner diameter of the drainage hole (3-3); the drainage plate (4) has a drainage hole; When working, rotate the handwheel (17), the large valve stem (5) moves downward, overcomes the tension force of the spring (24), presses down the small valve stem (2) on the small valve core, and pushes down the small valve stem (2) The bonnet (2-1) of the bonnet (2-1) moves down to open the drainage hole (3-2) at the bottom of the disc (3); continue to rotate the handwheel (17), and the piston (8), disc (3) and The small valve core moves downward; the fluid medium flows from the drainage hole (3-2) at the bottom of the disc (3), through the drainage hole on the drainage plate (4) and the drainage groove (5-2) on the large valve stem (5). 3) Export to reduce the pressure of the fluid medium at the inlet. 2. A high-pressure pipeline manual balancing valve according to claim 1, further comprising a balancing chamber; The balance chamber includes a top valve port of the valve body (1), a piston snap ring (10), a cone valve pin (9) and the piston (8), wherein: The piston snap ring (10) is fixed on the cylindrical notch (5-4) on the large valve stem (5) with the large valve stem (5) as the center of the circle; the piston snap ring (10) is symmetrical with the center of the circle A plurality of through holes are provided, and the piston (8) is provided with a tapered pin hole (8-2) matched with the through hole, and the cone valve pin (9) is fixed on the piston snap ring (10). In the through hole, the pin head can enter and exit the tapered pin hole (8-2) of the piston (8); the top of the piston (8) is provided with a circular groove whose diameter is larger than the outer surface of the piston snap ring (10). diameter, which forms a balance chamber with the valve port on the top of the valve body (1), and the piston snap ring (10) can move up and down in it driven by the large valve stem (5); the downward limit position of the piston snap ring (10) is the cone valve Where the tapered surface in the middle of the pin (9) closely matches the tapered pin hole (8-2) of the piston (8), the upward limit does not exceed the bottom of the valve cover (15), and the total stroke is the same as the up and down stroke of the valve disc (5-1) ; When the valve needs to be opened, rotate the hand wheel (17), the large valve rod (5) moves downward, and the pin head of the cone valve pin (9) fixed on the piston snap ring (10) faces downward toward the matching piston (8 ) to move the tapered pin hole (8-2) until the tapered surface in the middle of the cone valve pin (9) tightly covers the tapered pin hole (8-2) of the piston (8) to achieve pressure accumulation in the balance chamber ; When the valve needs to be closed, rotate the hand wheel (17), the large valve stem (5) moves upward, and the pin head of the cone valve pin (9) fixed on the piston snap ring (10) moves upward until the cone valve pin ( 9) The tapered surface in the middle is completely separated from the tapered pin hole (8-2) of the piston (8), realizing the pressure relief of the balance chamber. 3. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that a circular groove is opened on the upper part of the valve cover (15), and a packing gland (16) is arranged on it , The space between the circular groove and the packing gland (16) is provided with a stuffing box (22) to seal it. 4. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that the valve body (1), valve flap (3) and valve cover (15) are made of silicon brass. 5. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that the large valve stem (5) and piston (8) are made of aluminum bronze. 6. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that the packing gland (16) is made of manganese brass. 7. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that the sealing surface of the valve disc (3) and the sealing surface of the valve body (1) form a conical hard seal. 8. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that the sealing surface of the disc (3) and the sealing surface of the piston (8) form a metal gasket hard seal. 9. A high-pressure pipeline manual balancing valve according to claim 1 or 2, characterized in that the sealing surface of the top valve port of the valve body (1) and the sealing surface of the valve cover (15) form a metal gasket hard seal.