Pressure balance ball valve

Abstract

The utility model discloses a pressure balance ball valve which comprises a valve body, a valve ball, a first valve cover and a second valve cover, the first valve cover and the second valve cover are arranged at the two ends of the valve body respectively, a valve rod is rotationally arranged on the valve body, the valve ball is arranged on the valve rod and located in the valve body, and the first valve cover and the second valve cover are arranged on the valve rod. A stuffing box is arranged between the valve rod and the valve ball, a valve seat assembly is arranged between the first valve cover and the valve ball, a valve seat assembly is arranged between the second valve cover and the valve ball, a first side flow channel is formed in the first valve cover, and a second side flow channel is formed in the second valve cover. According to the ball valve, the temporary storage cavity is additionally arranged in the valve body, the temporary storage cavity is communicated with the first bypass channel and the second bypass channel of the valve ball, opening and closing of the first bypass channel and the second bypass channel are controlled by the sealing screw plug, and communication of the first side flow channel and the second side flow channel on the two sides of the valve ball can be achieved; the pressure difference between the two sides of the valve ball is reduced, and the valve ball can be rapidly rotated.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a pressure-balanced ball valve. Background Art

[0002] The ball valve is a commonly used valve at present. The commonly used ball valve structure is shown in the patent announcement document CN205806550U. Since there is no structure to balance the pressure on both sides of the valve ball (i.e., the upstream and downstream of the valve ball), the ball valve of this structure needs to withstand a large pressure difference on both sides when opening. The greater the pressure difference, the more difficult it is to open the valve (i.e., rotate the ball valve). When the pressure difference reaches a certain level, it must be opened with the help of an actuator. The actuator is not only large in size, but also has a cumbersome maintenance process and a relatively high cost of use. Utility Model Content

[0003] In view of the above-mentioned problem, the utility model proposes a pressure-balanced ball valve. The ball valve further provides a temporary storage chamber in the valve body. The passages on both sides of the temporary storage chamber and the valve ball are controlled by sealing screw plugs. Turning the sealing screw plug can connect the temporary storage chamber and the passages on both sides of the valve ball, thereby reducing the pressure difference on both sides of the valve ball. The resistance encountered when rotating the valve ball is relatively small, thereby ensuring that the valve ball can be rotated quickly.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A pressure-balanced ball valve comprises a valve body, a valve ball, a first valve cover and a second valve cover, wherein the first valve cover and the second valve cover are respectively arranged at two ends of the valve body, a valve stem is rotatably arranged on the valve body, the valve ball is arranged on the valve stem, the valve ball is located in the valve body, a stuffing box is arranged between the valve stem and the valve ball, a valve seat assembly is arranged between the first valve cover and the valve ball, a valve seat assembly is arranged between the second valve cover and the valve ball, a first side flow channel is arranged in the first valve cover, a second side flow channel is arranged in the second valve cover, the first side flow channel and the second side flow channel are separated The first valve cover and the second valve cover are respectively located on both sides of the valve ball, and a closed temporary storage cavity is formed between the first valve cover, the second valve cover, the valve ball and the valve body. The first valve cover is provided with a first bypass channel, and the second valve cover is provided with a second bypass channel. The first bypass channel connects the first side flow channel with the temporary storage cavity, and the second bypass channel connects the second side flow channel with the temporary storage cavity. The first valve cover and the second valve cover are both provided with sealing screw plugs. The sealing screw plug on the first valve cover is used to control the opening and closing of the first bypass channel, and the sealing screw plug on the second valve cover is used to control the opening and closing of the second bypass channel.

[0006] The working principle of this balanced ball valve is as follows: assuming that in the initial state, the valve ball is in a state of blocking the first side flow channel and the second side flow channel, the first side flow channel is upstream, and the second side flow channel is downstream, and the liquid has a tendency to flow from upstream to downstream. The sealing screw plug on the first valve cover blocks the first bypass channel, and the sealing screw plug on the second valve cover blocks the second bypass channel. If the upstream liquid pressure is large, the valve stem may not be turned (or an actuator may be needed to turn the valve stem). In order to facilitate the quick turning of the valve stem, first turn the sealing screw plug on the second valve cover to connect the second side flow channel with the temporary storage cavity, and then turn the sealing screw plug on the first valve cover to connect the first side flow channel with the temporary storage cavity, and then the liquid in the first side flow channel enters the second side flow channel through the first bypass channel, the temporary storage cavity and the second bypass channel, the liquid pressure in the first side flow channel is greatly reduced, and the pressure difference on both sides of the valve ball is greatly reduced (in extreme cases, the pressure on both sides can even be completely balanced, and there is no pressure difference), and the valve stem can be turned quickly or with less force, without the need to use an actuator to turn the valve stem. When the valve needs to be closed, the sealing screw plug can be turned first, the sealing screw plug blocks the first bypass channel and the second bypass channel, and then the valve stem is turned to close the valve.

[0007] To summarize, in this type of ball valve, an additional temporary storage chamber is provided in the valve body, and the temporary storage chamber is in a connected state with the two first bypass channels and the second bypass channel of the valve ball. The opening and closing of the first bypass channel and the second bypass channel are controlled by a sealing screw plug. Turning the sealing screw plug can realize the conduction of the first side flow channel and the second side flow channel on both sides of the valve ball, reduce the pressure difference on both sides of the valve ball, and the resistance encountered when rotating the valve ball is relatively small, ensuring that the valve ball can be rotated quickly.

[0008] Optionally, the first valve cover is consistent in shape and size with the second valve cover, and the first bypass channel is consistent in shape and size with the second bypass channel.

[0009] Since the first valve cover and the second valve cover have the same shape and size, and the first bypass channel and the second bypass channel have the same shape and size, the installation structure of the sealing screw plug on the first valve cover and the second valve cover is consistent. This makes the ball valve a completely symmetrical ball valve, and the upstream and downstream of the ball valve can be switched according to the use requirements.

[0010] Optionally, it also includes a flexible sealing gasket and a steel ball, wherein the flexible sealing gasket is arranged in a step in the first bypass channel, and the steel ball is located between the flexible sealing gasket and the sealing screw plug.

[0011] The steel ball is located between the sealing screw plug and the flexible sealing gasket. The sealing screw plug is used to tighten the steel ball. When the steel ball is tightened on the flexible sealing gasket by the sealing screw plug, the steel ball and the sealing gasket work together to seal the first bypass channel or the second bypass channel. When it is necessary not to block the first bypass channel or the second bypass channel, it is only necessary to twist the sealing screw plug so that the sealing screw plug is no longer tightened against the steel ball, and the steel ball can slide between the sealing gasket and the sealing screw plug.

[0012] Optionally, a sealing ring is provided on the sealing screw plug, and there are no less than 2 sealing rings on the sealing screw plug, and the sealing rings on the sealing screw plug are in a parallel state.

[0013] Specifically, the sealing screw plug is installed on the first valve cover or the second valve cover through the threads on its surface, and the sealing ring on the sealing screw plug is used to ensure the sealing between the sealing screw plug itself and the first valve cover or the second valve cover.

[0014] Optionally, a sealing O-ring is further included, and the sealing O-ring is arranged between the valve body and the first valve cover and between the valve body and the second valve cover.

[0015] The function of the sealing O-ring is to seal the gap between the valve body and the first valve cover and the gap between the valve body and the second valve cover.

[0016] Optionally, it also includes a sealing ring, which is sleeved on the valve seat assembly, and the sealing ring is arranged between the first valve cover and the valve seat assembly, and the sealing ring is arranged between the second valve cover and the valve seat assembly.

[0017] The function of the sealing ring is to seal the gap between the first valve cover and the valve seat assembly and the gap between the second valve cover and the valve seat assembly.

[0018] Optionally, a spring is further included, wherein the spring is arranged on the valve seat assembly, and one end of the spring is against the first valve cover or the second valve cover, and the spring is used to drive the valve seat assembly to be close to the valve ball.

[0019] The spring can ensure that the valve seat assembly is close to the valve ball, thereby ensuring the sealing between the valve seat assembly and the valve ball.

[0020] Optionally, the first side flow channel is an L-shaped first side flow channel.

[0021] Specifically, the first side flow channel and the second side flow channel are both L-shaped. The first side flow channel and the second side flow channel are symmetrically distributed about the valve stem.

[0022] Optionally, the first valve cover is matched with the valve body through a bolt assembly, and the second valve cover is matched with the valve body through a bolt assembly.

[0023] The first valve cover and the second valve cover are both matched with the valve body through a bolt assembly, which makes it easy to quickly disassemble and assemble the ball valve when necessary.

[0024] Optionally, a guide column is provided on the valve body, and the valve ball is rotatably matched with the guide column through its own groove, and the valve stem and the guide column are respectively located on both sides of the valve ball.

[0025] A guide column is provided, and the guide column cooperates with the recessed groove of the valve ball, and the valve stem and the guide column are respectively located on both sides of the valve ball, which is equivalent to the valve ball being in a limited state, thus ensuring that the valve ball is more stable when rotating.

[0026] The beneficial effect of the utility model is that an additional temporary storage chamber is provided in the valve body, the temporary storage chamber is in a connected state with the two first bypass channels and the second bypass channel of the valve ball, the opening and closing of the first bypass channel and the second bypass channel are controlled by the sealing screw plug, and turning the sealing screw plug can realize the conduction of the first side flow channel and the second side flow channel on both sides of the valve ball, reduce the pressure difference on both sides of the valve ball, and the resistance encountered when rotating the valve ball is relatively small, ensuring that the valve ball can be rotated quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a pressure balanced ball valve;

[0028] Figure 2 yes Figure 1 The enlarged schematic diagram of A in the middle;

[0029] Figure 3 It is a schematic diagram of the positional relationship among the sealing screw plug, the steel ball and the sealing gasket;

[0030] Figure 4 It is a schematic diagram of the state when the sealing screw plug blocks the first bypass channel;

[0031] Figure 5 It is a schematic diagram of the state when the sealing plug does not block the first bypass channel.

[0032] The reference numerals in the figure are: 1. Sealing plug; 101. Thread; 2. Sealing ring; 31. First valve cover; 301. First side channel; 311. First bypass channel; 32. Second valve cover; 321. Second bypass channel; 302. Second side channel; 4. Steel ball; 5. Sealing gasket; 6. Valve seat assembly; 7. Stuffing box; 8. Valve body; 9. Sealing O-ring; 10. Spring; 11. Valve ball; 12. Sealing ring; 13. Valve stem; 14. Bolt assembly; 15. Guide column; 83. Temporary storage cavity. DETAILED DESCRIPTION

[0033] The utility model is described in detail below in conjunction with the accompanying drawings.

[0034] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a pressure balanced ball valve comprises a valve body 8, a valve ball 11, a first valve cover 31 and a second valve cover 32. The first valve cover 31 and the second valve cover 32 are respectively arranged at both ends of the valve body 8. A valve stem 13 is rotatably arranged on the valve body 8. The valve ball 11 is arranged on the valve stem 13. The valve ball 11 is located in the valve body 8. A stuffing box 7 is arranged between the valve stem 13 and the valve ball 11. A valve seat assembly 6 is arranged between the first valve cover 31 and the valve ball 11. A valve seat assembly 6 is arranged between the second valve cover 32 and the valve ball 11. A first side flow channel 301 is arranged in the first valve cover 31. A second side flow channel 302 is arranged in the second valve cover 32. The first side flow channel 301 and the second side flow channel 302 are separated. The first valve cover 31 and the second valve cover 32 are respectively located on both sides of the valve ball 11, and a closed temporary storage cavity 83 is formed between the first valve cover 31, the second valve cover 32, the valve ball 11 and the valve body 8. The first valve cover 31 is provided with a first bypass channel 311, and the second valve cover 32 is provided with a second bypass channel 321. The first bypass channel 311 connects the first side flow channel 301 with the temporary storage cavity 83, and the second bypass channel 321 connects the second side flow channel 302 with the temporary storage cavity. The first valve cover 31 and the second valve cover 32 are both provided with sealing screw plugs 1. The sealing screw plug 1 on the first valve cover 31 is used to control the opening and closing of the first bypass channel 311, and the sealing screw plug 1 on the second valve cover 32 is used to control the opening and closing of the second bypass channel 321.

[0035] The working principle of this balanced ball valve is as follows: assuming that in the initial state, the valve ball 11 is in a state of blocking the first side flow channel 301 and the second side flow channel 302, the first side flow channel 301 is upstream, the second side flow channel 302 is downstream, and the liquid has a tendency to flow from upstream to downstream. The sealing screw plug 1 on the first valve cover 31 blocks the first bypass channel 311, and the sealing screw plug 1 on the second valve cover 32 blocks the second bypass channel 321. This state is shown in the attached figure. Figure 4 As shown in FIG, if the upstream liquid pressure is high, the valve stem 13 may not be turned (or the valve stem 13 may need to be turned with the aid of an actuator). In order to quickly turn the valve stem 13, first turn the sealing screw plug 1 on the second valve cover 32 (see FIG. Figure 1 In the direction shown in FIG, the sealing screw plug 1 on the right side is unscrewed), so that the second side flow channel 302 is connected to the temporary storage cavity, and then the sealing screw plug 1 on the first valve cover 31 is screwed (refer to FIG. Figure 1In the direction shown in the figure, the sealing screw plug 1 on the left is unscrewed), so that the first side channel 301 and the temporary storage chamber are in conduction, and then the liquid in the first side channel 301 enters the second side channel 302 through the first bypass channel 311, the temporary storage chamber and the second bypass channel 321. The liquid pressure in the first side channel 301 is greatly reduced, and the pressure difference on both sides of the valve ball 11 is greatly reduced (in extreme cases, the pressure on both sides can even be completely balanced, and there is no pressure difference). The valve stem 13 can be turned quickly or with less force, without the need for an actuator to turn the valve stem 13. When the valve needs to be closed, the sealing screw plug 1 can be turned first, and the sealing screw plug 1 blocks the first bypass channel 311 and the second bypass channel 321, and then the valve stem 13 is turned to close the valve.

[0036] In summary, in this type of ball valve, an additional temporary storage chamber is provided in the valve body 8, and the temporary storage chamber is in a connected state with the two first bypass channels 311 and the second bypass channel 321 of the valve ball 11. The opening and closing of the first bypass channel 311 and the second bypass channel 321 are controlled by the sealing plug 1. Turning the sealing plug 1 can realize the conduction of the first side flow channel 301 and the second side flow channel 302 on both sides of the valve ball 11, reduce the pressure difference on both sides of the valve ball 11, and the resistance encountered when rotating the valve ball 11 is relatively small, ensuring that the valve ball 11 can be rotated quickly.

[0037] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the first valve cover 31 and the second valve cover 32 are consistent in shape and size, and the first bypass channel 311 and the second bypass channel 321 are consistent in shape and size.

[0038] Since the first valve cover 31 and the second valve cover 32 have the same shape and size, and the first bypass channel 311 and the second bypass channel 321 have the same shape and size, the installation structure of the sealing screw plug 1 on the first valve cover 31 and the second valve cover 32 is consistent. In this way, the ball valve can be a completely symmetrical ball valve, and the upstream and downstream of the ball valve can be switched according to the use requirements.

[0039] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a flexible sealing gasket 5 and a steel ball 4. The flexible sealing gasket 5 is arranged in a step in the first bypass channel 311, and the steel ball 4 is located between the flexible sealing gasket 5 and the sealing screw plug 1.

[0040] The steel ball 4 is located between the sealing screw plug 1 and the flexible sealing gasket 5. The sealing screw plug 1 is used to tighten the steel ball 4. When the steel ball 4 is tightened on the flexible sealing gasket 5 by the sealing screw plug 1, the steel ball 4 and the sealing gasket 5 play a sealing role together, and the steel ball 4 and the sealing gasket 5 block the first bypass channel 311 or the second bypass channel 321. When it is necessary not to block the first bypass channel 311 or the second bypass channel 321, it is only necessary to twist the sealing screw plug 1 so that the sealing screw plug 1 is no longer tightened against the steel ball 4, and the steel ball 4 can slide between the sealing gasket 5 and the sealing screw plug 1.

[0041] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a sealing ring 2 is provided on the sealing screw plug 1, and there are no less than two sealing rings 2 on the sealing screw plug 1, and the sealing rings 2 on the sealing screw plug 1 are in a parallel state.

[0042] Specifically, the sealing screw plug 1 is installed on the first valve cover 31 or the second valve cover 32 through the threads 101 on its surface, and the sealing ring 2 on the sealing screw plug 1 is used to ensure the sealing between the sealing screw plug 1 itself and the first valve cover 31 or the second valve cover 32.

[0043] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a sealing O-ring 9 is also included. The sealing O-ring 9 is arranged between the valve body 8 and the first valve cover 31 and between the valve body 8 and the second valve cover 32 .

[0044] The function of the sealing O-ring 9 is to seal the gap between the valve body 8 and the first valve cover 31 and the gap between the valve body 8 and the second valve cover 32 .

[0045] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a sealing ring 12, which is sleeved on the valve seat assembly 6, and a sealing ring 12 is arranged between the first valve cover 31 and the valve seat assembly 6, and a sealing ring 12 is arranged between the second valve cover 32 and the valve seat assembly 6.

[0046] The function of the sealing ring 12 is to seal the gap between the first valve cover 31 and the valve seat assembly 6 and the gap between the second valve cover 32 and the valve seat assembly 6 .

[0047] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a spring 10 is also included. The spring 10 is arranged on the valve seat assembly 6, and one end of the spring 10 is against the first valve cover 31 or the second valve cover 32. The spring 10 is used to drive the valve seat assembly 6 to be close to the valve ball 11.

[0048] The spring 10 can ensure that the valve seat assembly 6 is in close contact with the valve ball 11 , thereby ensuring the sealing between the valve seat assembly 6 and the valve ball 11 .

[0049] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the first side flow channel 301 is an L-shaped first side flow channel 301.

[0050] Specifically, the first side flow channel 301 and the second side flow channel 302 are both L-shaped. The first side flow channel 301 and the second side flow channel 302 are symmetrically distributed about the valve stem 13. The L-shaped first side flow channel and the second side flow channel facilitate sealing of the sealing screw plug to attach Figure 2 As shown in , a section of the first side flow channel is perpendicular to the sealing plug, while another section of the first side flow channel is on the same straight line as the sealing plug.

[0051] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the first valve cover 31 is matched with the valve body 8 through the bolt assembly 14 , and the second valve cover 32 is matched with the valve body 8 through the bolt assembly 14 .

[0052] The first valve cover 31 and the second valve cover 32 are both matched with the valve body 8 through the bolt assembly 14, which facilitates the rapid disassembly and assembly of the ball valve when necessary.

[0053] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a guide column 15 is provided on the valve body 8, and the valve ball 11 rotates together with the guide column 15 through its own groove. The valve stem 13 and the guide column 15 are respectively located on both sides of the valve ball 11, and the valve stem 13 and the guide column 15 are located in a straight line.

[0054] A guide post 15 is provided, and the guide post 15 cooperates with the recess of the valve ball 11, and the valve stem 13 and the guide post 15 are respectively located on both sides of the valve ball 11, so that the valve ball 11 is in a limited state, which can ensure that the valve ball 11 is more stable when rotating.

[0055] See attached Figure 1 As shown in , for the convenience of subsequent maintenance, the sealing screw plugs installed on the first valve cover and the second valve cover are of the same model, and the sealing screw plug on the first valve cover is parallel to the sealing screw plug on the second valve cover. The two sealing screw plugs are axially symmetrically distributed about the valve stem, and the two sealing screw plugs are located on both sides of the valve stem.

[0056] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A pressure balanced ball valve, comprising a valve body, a valve ball, a first valve cover and a second valve cover, wherein the first valve cover and the second valve cover are respectively arranged at two ends of the valve body, a valve stem is rotatably arranged on the valve body, the valve ball is arranged on the valve stem, the valve ball is located in the valve body, a stuffing box is arranged between the valve stem and the valve ball, a valve seat assembly is arranged between the first valve cover and the valve ball, and a valve seat assembly is arranged between the second valve cover and the valve ball, characterized in that: A first side flow channel is provided in the first valve cover, and a second side flow channel is provided in the second valve cover. The first side flow channel and the second side flow channel are respectively located on both sides of the valve ball. A closed temporary storage cavity is formed between the first valve cover, the second valve cover, the valve ball and the valve body. A first bypass channel is provided on the first valve cover, and a second bypass channel is provided on the second valve cover. The first bypass channel connects the first side flow channel with the temporary storage cavity, and the second bypass channel connects the second side flow channel with the temporary storage cavity. Sealing screw plugs are provided on the first valve cover and the second valve cover. The sealing screw plug on the first valve cover and the sealing screw plug on the second valve cover are in a parallel state, and the two sealing screw plugs are located on both sides of the valve stem.

2. The pressure-balanced ball valve according to claim 1, characterized in that: The first valve cover and the second valve cover have the same shape and size, and the first bypass channel and the second bypass channel have the same shape and size.

3. The pressure-balanced ball valve according to claim 1, characterized in that: It also includes a flexible sealing gasket and a steel ball. The flexible sealing gasket is arranged in a step in the first bypass channel, and the steel ball is located between the flexible sealing gasket and the sealing plug. The sealing plug is installed on the first valve cover or the second valve cover through its own thread.

4. The pressure-balanced ball valve according to claim 1, characterized in that: A sealing ring is arranged on the sealing screw plug.

5. The pressure-balanced ball valve according to claim 1, characterized in that: The valve body also includes a sealing O-ring, which is arranged between the valve body and the first valve cover and between the valve body and the second valve cover.

6. The pressure-balanced ball valve according to claim 1, characterized in that: It also includes a sealing ring, which is sleeved on the valve seat assembly, and the sealing ring is arranged between the first valve cover and the valve seat assembly, and the sealing ring is arranged between the second valve cover and the valve seat assembly.

7. The pressure-balanced ball valve according to claim 1, characterized in that: It also includes a spring, which is arranged on the valve seat assembly, and one end of the spring abuts against the first valve cover or the second valve cover.

8. The pressure-balanced ball valve according to claim 1, characterized in that: The first side flow channel is an L-shaped first side flow channel, and the second side flow channel is an L-shaped second side flow channel.

9. The pressure-balanced ball valve according to claim 1, characterized in that: The first valve cover is matched with the valve body through a bolt assembly.

10. The pressure-balanced ball valve according to claim 1, characterized in that: The valve body is provided with a guide column, and the valve ball is rotatably matched with the guide column through its own sink groove.

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