Pressure balanced line control valve

Abstract

The utility model relates to valve technical field especially is involved in a kind of pressure balance formula pipeline control valve, including valve body, valve clapper, valve seat, valve stem and drive mechanism, channel for medium passing through is equipped in valve body, valve clapper and valve seat sealing cooperation divide channel into import end and export end, drive mechanism is driven valve clapper reciprocating motion by valve stem, drive mechanism includes sleeve and piston piece, sleeve is sleeved on the side of valve clapper close to export end, and uniform pressure chamber is formed between valve clapper and sleeve, uniform pressure hole is set up on valve clapper, and uniform pressure chamber is communicated with import end by uniform pressure hole, sleeve is also equipped with the air cavity separated with uniform pressure chamber in, piston piece is slidably arranged in air cavity, one end of valve stem is connected with valve clapper, and the other end is inserted into air cavity and is connected with piston piece, air cavity is communicated with the first gas channel extending to the outside of valve body, the utility model has the drive mechanism of control valve clapper opening and closing, and the pressure of both sides of valve clapper is balanced by the uniform pressure chamber of drive mechanism, guarantee the opening and closing of valve clapper can be normally controlled.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pressure-balanced pipeline control valve. Background Technology

[0002] Control valves consist of two main assemblies: the valve body assembly and the actuator assembly (or actuator system), and are divided into four major series: single-seat series control valves, double-seat series control valves, sleeve series control valves, and self-operated series control valves.

[0003] Existing control valves are usually non-pressure balanced. When the medium pressure in the inlet channel is too high, it will push open the valve disc, connecting the inlet and outlet channels. In other words, the valve is opened uncontrollably, thus failing to function as a control valve.

[0004] The purpose of this invention is to propose corresponding solutions to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a pressure-balanced pipeline control valve. This invention has a drive mechanism for controlling the opening and closing of the valve disc. The pressure equalization chamber of the drive mechanism balances the pressure on both sides of the valve disc, ensuring that the opening and closing of the valve disc can be controlled normally.

[0006] The technical solution adopted by this utility model is as follows: a pressure-balanced pipeline control valve, including a valve body, a valve disc, a valve seat, a valve stem, and a drive mechanism. The valve body has a channel for the medium to pass through. The valve disc and the valve seat are sealed together to divide the channel into an inlet end and an outlet end. The drive mechanism drives the valve disc to reciprocate through the valve stem. The drive mechanism includes a sleeve and a piston. The sleeve is sleeved on the side of the valve disc near the outlet end. A pressure equalization chamber is formed between the valve disc and the sleeve. A pressure equalization hole is opened on the valve disc. The pressure equalization chamber is connected to the inlet end through the pressure equalization hole. A venting chamber is also provided in the sleeve, which is separated from the pressure equalization chamber. The piston is slidably disposed in the venting chamber. One end of the valve stem is connected to the valve disc, and the other end extends into the venting chamber and is connected to the piston. The venting chamber is connected to a first gas channel extending to the valve body.

[0007] The drive mechanism also includes a mounting base and at least two connecting posts. The mounting base is connected to the inner wall of the valve body by fasteners, and the valve seat is sandwiched between the mounting base and the inner wall of the valve body. The sleeve is connected to the mounting base by two connecting posts. The two connecting posts are distributed around the sleeve, and a flow port communicating with the outlet end is provided between the two connecting posts. When the valve disc and the valve seat are sealed together, the pressure equalization chamber is blocked by the valve disc and the flow port.

[0008] The piston component divides the venting chamber into a first air chamber and a second air chamber. The first air chamber is located on the side of the piston component near the valve disc. The two connecting columns are a first column and a second column, respectively. The first gas passage includes a first air section opened on the sleeve, a second air section opened on the first column, and a third air section opened on the valve body. The first air section, the second air section, and the third air section are connected in sequence. The first air section is also connected to the first air chamber.

[0009] The venting chamber is also connected to a second gas channel extending to the valve body. The second gas channel includes a fourth gas section opened on the sleeve, a fifth gas section opened on the second column, and a sixth gas section opened on the valve body. The fourth, fifth, and sixth gas sections are connected in sequence, and the fourth gas section is also connected to the second gas chamber.

[0010] The sleeve has an annular groove that communicates with the first air section, located on the inner wall of the first air chamber.

[0011] The valve disc has at least two pressure equalization holes.

[0012] The sleeve is provided with a first sealing ring at the joint with the valve stem, and the piston is covered with a second sealing ring that abuts against the inner wall of the venting chamber.

[0013] The beneficial effects of this utility model are as follows: This utility model has a drive mechanism for controlling the opening and closing of the valve disc, namely, the cooperation of the sleeve and the piston. The piston is slidably disposed in the venting chamber of the sleeve. The venting chamber is also connected to a first gas channel. Air is injected into the venting chamber through the first gas channel to drive the piston to slide. The valve disc connected to the piston also slides along with it to realize the opening and closing of the valve disc. The pressure equalization chamber is connected to the inlet end through the pressure equalization hole on the valve disc. The medium at the inlet end enters the pressure equalization chamber along the pressure equalization hole to realize the equalization of pressure on both sides of the valve disc. The valve disc will not be pushed open due to the increase of the medium pressure at the inlet end. Moreover, the opening and closing of the valve disc can only be controlled by the piston, ensuring that the opening and closing of the valve disc can be normally controlled. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is a schematic diagram of the pressure-balanced pipeline control valve of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is a cross-sectional view of the present invention from another perspective;

[0018] Figure 4 This is a schematic diagram of the sleeve structure in this utility model;

[0019] In the diagram, 1-valve body, 2-valve disc, 3-valve seat, 4-valve stem, 5-inlet end, 6-outlet end, 7-sleeve, 8-piston, 9-pressure equalization chamber, 10-pressure equalization hole, 11-venting chamber, 12-first gas passage, 13-mounting base, 14-fastener, 15-flow port, 16-first gas chamber, 17-second gas chamber, 18-first column, 19-second column, 20-first gas section, 21-second gas section, 22-third gas section, 23-second gas passage, 24-fourth gas section, 25-fifth gas section, 26-sixth gas section, 27-ring groove, 28-first sealing ring, 29-second sealing ring. Detailed Implementation

[0020] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0021] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0022] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] like Figures 1 to 4As shown in the figure, a pressure-balanced pipeline control valve includes a valve body 1, a valve disc 2, a valve seat 3, a valve stem 4, and a drive mechanism. The valve body 1 has a channel for the medium to pass through. The valve disc 2 and the valve seat 3 are sealed together to divide the channel into an inlet end 5 and an outlet end 6. The drive mechanism drives the valve disc 2 to reciprocate through the valve stem 4. The drive mechanism includes a sleeve 7 and a piston 8. The sleeve 7 is sleeved on the side of the valve disc 2 near the outlet end 6. A pressure equalization chamber 9 is formed between the valve disc 2 and the sleeve 7. A pressure equalization hole 10 is opened on the valve disc 2. The pressure equalization chamber 9 is connected to the inlet end 5 through the pressure equalization hole 10. The sleeve 7 also has a venting chamber 11 separated from the pressure equalization chamber 9. The piston 8 is slidably disposed in the venting chamber 11. One end of the valve stem 4 is connected to the valve disc 2, and the other end extends into the venting chamber 11 and is connected to the piston 8. The venting chamber 11 is connected to a first gas channel 12 extending to the outside of the valve body 1.

[0024] The beneficial effects of this design are as follows: This utility model has a drive mechanism for controlling the opening and closing of the valve disc, namely, the cooperation of a sleeve and a piston. The piston is slidably disposed within the venting chamber of the sleeve, which is also connected to a first gas channel. Gas is supplied to the venting chamber through the first gas channel, driving the piston to slide. The valve disc connected to the piston also slides along with it, realizing the opening and closing of the valve disc. The pressure equalization chamber is connected to the inlet end through a pressure equalization hole on the valve disc. The medium at the inlet end enters the pressure equalization chamber along the pressure equalization hole, achieving pressure equalization on both sides of the valve disc. The valve disc will not be pushed open due to increased medium pressure at the inlet end, and the opening and closing of the valve disc can only be controlled by the piston, ensuring normal control of the valve disc's opening and closing. A pneumatic mechanism, for example, can be installed outside the valve body for supplying or venting gas into the first gas channel. When the pneumatic mechanism supplies gas, the piston begins to slide, simultaneously driving the valve disc away from the valve seat, thus opening the valve; conversely, the valve closes.

[0025] Further, the drive mechanism also includes a mounting base 13 and at least two connecting posts. The mounting base 13 is connected to the inner wall of the valve body 1 by fasteners 14, and the valve seat 3 is sandwiched between the mounting base 13 and the inner wall of the valve body 1. The sleeve 7 is connected to the mounting base 13 by two connecting posts. The two connecting posts are distributed around the sleeve 7, and a flow port 15 communicating with the outlet end 6 is provided between the two connecting posts. When the valve disc 2 and the valve seat 3 are sealed together, the pressure equalization chamber 9 is blocked by the valve disc 2 and the flow port 15.

[0026] The advantages of this design are as follows: the sleeve, connecting column, and mounting base are integrally formed. The mounting base is fixed to the valve body by fasteners, and the inner edge of the mounting base also fixes the valve seat to the valve body. The fasteners use existing bolt technology. The flow port between the connecting columns is used when the valve disc is open. The inlet end is connected to the outlet end through the flow port. When the valve disc is closed, the flow port is separated by the valve disc. The compact structure enables the normal opening and closing of the valve, reduces the overall size of the control valve, and lowers the manufacturing cost.

[0027] Further configured, the piston 8 divides the venting chamber 11 into a first air chamber 16 and a second air chamber 17. The first air chamber 16 is located on the side of the piston 8 near the valve disc 2. The two connecting columns are a first column 18 and a second column 19, respectively. The first gas passage 12 includes a first air section 20 opened on the sleeve 7, a second air section 21 opened on the first column 18, and a third air section 22 opened on the valve body 1. The first air section 20, the second air section 21, and the third air section 22 are connected in sequence. The first air section 20 is also connected to the first air chamber 16.

[0028] The beneficial effects of this design are as follows: even when the valve is closed, the piston will not come into contact with the inner walls on both sides of the venting chamber, thus ensuring that the venting chamber is always divided into a first air chamber and a second air chamber. The first section of the first gas passage is connected to the first air chamber, allowing the first gas passage to fill or exhaust gas into the first air chamber, preventing the piston from sticking to the inner wall of the venting chamber and being unable to slide. The first gas passage runs along the first column, the mounting base, and the valve body all the way to the outside of the valve body, isolating the gas path from the internal passage of the valve body, creating a separate gas path to avoid interference.

[0029] Furthermore, the ventilation chamber 11 is also connected to a second gas channel 23 extending to the outside of the valve body 1. The second gas channel 23 includes a fourth gas section 24 opened on the sleeve 7, a fifth gas section 25 opened on the second column 19, and a sixth gas section 26 opened on the valve body 1. The fourth gas section 24, the fifth gas section 25, and the sixth gas section 26 are connected in sequence. The fourth gas section 24 is also connected to the second gas chamber 17.

[0030] The beneficial effects of this design are as follows: the second gas passage is connected to the second gas chamber, allowing for the filling or exhaust of gas into the second gas chamber. When the first gas chamber is filled, the second gas chamber exhausts gas, and vice versa, when the first gas chamber exhausts gas, the second gas chamber is filled, ensuring that the piston can slide smoothly. Furthermore, the second gas passage is connected to the outside of the valve body along the second column, the mounting seat, and the valve body. The second gas passage is not only isolated from the internal passage of the valve body but also isolated from the valve body itself, forming a separate gas path.

[0031] Furthermore, the sleeve 7 has an annular groove 27 that communicates with the first air section 20, recessed at the inner wall position corresponding to the first air chamber 16.

[0032] The beneficial effects of this design are as follows: the annular groove is not only used for machining and to open the first gas passage, but also to increase the space of the first gas chamber for filling and to prevent the piston from getting stuck.

[0033] Furthermore, the valve disc 2 is provided with at least two pressure equalization holes 10.

[0034] The beneficial effects of this setup are as follows: one of the two equalizing holes is used for the medium to enter, and the other is used for the air to be discharged, which facilitates the circulation of the equalizing chamber.

[0035] Furthermore, a first sealing ring 28 is provided at the joint between the sleeve 7 and the valve stem 4, and a second sealing ring 29 is provided on the piston 8 to abut against the inner wall of the venting chamber 11.

[0036] The beneficial effects of this design are as follows: the first sealing ring increases the sealing between the valve stem and the sleeve, isolating the pressure equalization chamber and the venting chamber; the second sealing ring increases the sealing between the piston and the venting chamber, isolating the first venting chamber and the second venting chamber.

[0037] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pressure balanced pipeline control valve, comprising a valve body (1), a valve disc (2), a valve seat (3), a valve stem (4) and a driving mechanism, the valve body (1) is provided with a channel for medium passing through, the valve disc (2) and the valve seat (3) are in sealing cooperation to separate the channel into an inlet end (5) and an outlet end (6), the driving mechanism drives the valve disc (2) to reciprocate through the valve stem (4), characterized in that: The driving mechanism includes a sleeve (7) and a piston (8). The sleeve (7) is sleeved on the side of the valve disc (2) near the outlet end (6). A pressure equalization chamber (9) is formed between the valve disc (2) and the sleeve (7). A pressure equalization hole (10) is provided on the valve disc (2). The pressure equalization chamber (9) is connected to the inlet end (5) through the pressure equalization hole (10). A venting chamber (11) separated from the pressure equalization chamber (9) is also provided inside the sleeve (7). The piston (8) is slidably disposed in the venting chamber (11). One end of the valve stem (4) is connected to the valve disc (2), and the other end extends into the venting chamber (11) and is connected to the piston (8). The venting chamber (11) is connected to a first gas channel (12) extending to the outside of the valve body (1). ​ 2. The pressure-balanced pipeline control valve according to claim 1, characterized in that: The drive mechanism also includes a mounting base (13) and at least two connecting posts. The mounting base (13) is connected to the inner wall of the valve body (1) by fasteners (14), and the valve seat (3) is sandwiched between the mounting base (13) and the inner wall of the valve body (1). The sleeve (7) is connected to the mounting base (13) by two connecting posts. The two connecting posts are distributed around the sleeve (7), and a flow port (15) communicating with the outlet end (6) is provided between the two connecting posts. When the valve disc (2) and the valve seat (3) are sealed together, the pressure equalization chamber (9) is blocked by the valve disc (2) and the flow port (15).

3. The pressure-balanced pipeline control valve according to claim 2, characterized in that: The piston (8) divides the venting chamber (11) into a first air chamber (16) and a second air chamber (17). The first air chamber (16) is located on the side of the piston (8) near the valve disc (2). The two connecting columns are a first column (18) and a second column (19). The first gas passage (12) includes a first gas section (20) opened on the sleeve (7), a second gas section (21) opened on the first column (18), and a third gas section (22) opened on the valve body (1). The first gas section (20), the second gas section (21), and the third gas section (22) are connected in sequence. The first gas section (20) is also connected to the first air chamber (16).

4. The pressure-balanced pipeline control valve according to claim 3, characterized in that: The ventilation chamber (11) is also connected to a second gas passage (23) extending to the outside of the valve body (1). The second gas passage (23) includes a fourth gas section (24) opened on the sleeve (7), a fifth gas section (25) opened on the second column (19), and a sixth gas section (26) opened on the valve body (1). The fourth gas section (24), the fifth gas section (25), and the sixth gas section (26) are connected in sequence. The fourth gas section (24) is also connected to the second gas chamber (17).

5. The pressure-balanced pipeline control valve according to claim 3, characterized in that: The sleeve (7) has an annular groove (27) that communicates with the first air section (20) at the inner wall position corresponding to the first air chamber (16).

6. The pressure-balanced pipeline control valve according to claim 1, characterized in that: At least two pressure equalization holes (10) are provided on the valve disc (2).

7. The pressure-balanced pipeline control valve according to claim 1, characterized in that: The sleeve (7) is provided with a first sealing ring (28) at the joint with the valve stem (4), and the piston (8) is covered with a second sealing ring (29) that abuts against the inner wall of the venting chamber (11).

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