A valve with functions of ball valve and check valve

Abstract

This utility model discloses a valve that combines the functions of a ball valve and a check valve, including a ball valve and a check valve installed inside the ball valve. The ball valve has a passage for fluid to pass through, and the check valve is installed inside the passage. The ball valve has a protrusion that abuts against a butterfly plate. A spring drives the butterfly plate to rotate and abuts against the protrusion to form a seal, allowing unidirectional flow of fluid in the passage. The spring extends to the edge of the butterfly plate, and a limiting element is provided on the butterfly plate to limit the spring's offset, thereby preventing interference between the spring and the passage. The beneficial effects of this utility model are: the check valve is installed inside the ball valve, making it suitable for space-constrained occasions; the spring extends to the edge of the butterfly plate, increasing the butterfly plate's reset force, while the limiting element limits the spring's offset from interfering with the butterfly plate's reset and reduces wear on the inner wall of the passage.

Description

Technical Field

[0001] This utility model relates to the technical field of valves and related devices, specifically a valve that combines the functions of a ball valve and a check valve. Background Technology

[0002] In industrial fluid transport systems, ball valves are typically installed on the outlet pipelines of power equipment such as centrifugal pumps and plunger pumps to regulate flow. However, backflow of fluid during shutdown poses a risk of pump damage, so check valves must be added to prevent backflow. However, conventional check valves have internal leakage problems and cannot meet the stringent requirements of zero leakage for hazardous media or pressure maintenance. Therefore, ball valves are usually installed to cut off the fluid, and a check valve is installed inside the ball valve to block backflow. This integrated design makes it suitable for space-constrained applications. At the same time, conventional designs use springs to reset the disc in the check valve, but the spring arm is short and the reset torque is small, which can easily lead to seal failure. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a valve that combines the functions of a ball valve and a check valve, so as to solve the problem that the small reset torque can easily lead to sealing failure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a valve that combines the functions of a ball valve and a check valve, comprising a valve body, a valve seat installed in the valve body, a ball valve, a check valve installed in the ball valve, and a valve stem for controlling the ball valve;

[0005] The valve seat is used to support the ball valve and to seal the ball valve.

[0006] The ball valve is provided with a passage for fluid to pass through, and the check valve is installed in the passage;

[0007] The valve seat and ball valve cooperate to control the flow rate of fluid into the channel, and the check valve is used to control the unidirectional flow of fluid within the channel;

[0008] The check valve includes a connector fixedly connected to the inner wall of the channel, a rotating shaft connected to the connector, a butterfly plate rotatably connected to the rotating shaft, and a spring connected to the rotating shaft. The ball valve is provided with a protrusion that abuts against the butterfly plate. The spring drives the butterfly plate to rotate and abuts against the protrusion to form a seal, so that the fluid in the channel can pass through in one direction.

[0009] The spring extends to the edge of the butterfly plate, and a limiting member is provided on the butterfly plate to limit the spring's offset, thereby preventing the spring from interfering with the channel.

[0010] As a further improvement to this utility model, the check valve also includes a cylindrical pin, which is connected to the connector and is used to prevent direct collision between multiple discs during rotation.

[0011] As a further improvement to this utility model, a compensation component is provided between the valve body and the valve seat, the compensation component including a sealing ring, the sealing ring being used to seal the gap between the valve body and the valve seat.

[0012] As a further improvement to this utility model, the compensation assembly also includes an adjusting pad and an elastic element, both of which are disposed between the valve seat and the valve body. The elastic element is used to ensure that the adjusting pad and the sealing ring fit tightly together.

[0013] As a further improvement to this utility model, the adjusting pad causes the valve seat to press tightly against the ball valve by squeezing the sealing ring.

[0014] As a further improvement to this utility model, the valve body is provided with a groove, which at least accommodates a portion of the elastic element.

[0015] As a further improvement to this utility model, the valve seat is provided with a receiving groove for accommodating the sealing ring, and at least a portion of the adjusting pad extends into the receiving groove. The sealing ring is squeezed and deformed by the elastic force of the elastic element, so as to compress and tighten the sealing ring between the valve seat and the inner wall of the valve body.

[0016] The beneficial effects of this utility model are:

[0017] (1) The check valve is installed inside the ball valve to reduce the space occupied by the valve core and make it suitable for space-constrained occasions;

[0018] (2) The spring extends to the edge of the butterfly plate, increasing the force for the butterfly plate to reset. At the same time, the limiting component restricts the spring from deflecting and interfering with the butterfly plate reset and reduces wear on the inner wall of the channel. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of a valve that combines the functions of a ball valve and a check valve.

[0020] Figure 2 This is a two-dimensional schematic diagram of the practical butterfly valve.

[0021] Figure 3 For practical purposes Figure 1 Enlarged view of part A in the middle.

[0022] Reference numerals: 1. Valve body; 11. Groove; 2. Valve seat; 21. Receiving groove; 3. Ball valve; 31. Channel; 32. Protrusion; 4. Check valve; 41. Connecting piece; 42. Rotary shaft; 43. Butterfly plate; 44. Spring; 45. Cylindrical pin; 46. Limiting element; 5. Valve stem; 6. Compensation assembly; 61. Sealing ring; 62. Adjusting shim; 63. Elastic element. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0024] Reference Figure 1-3 As shown, a valve that combines the functions of a ball valve and a check valve includes a valve body 1, a valve seat 2 installed in the valve body 1, a ball valve 3, a check valve 4 installed in the ball valve 3, and a valve stem 5 for controlling the ball valve 3.

[0025] Valve seat 2 is used to support ball valve 3 and to seal with ball valve 3;

[0026] The ball valve 3 is provided with a passage 31 for fluid to pass through, and the check valve 4 is installed in the passage 31;

[0027] Valve seat 2 and ball valve 3 cooperate to control the flow rate of fluid into channel 31, and check valve 4 is used to control the unidirectional flow of fluid in channel 31;

[0028] Check valve 4 includes a connector 41 fixedly connected to the inner wall of channel 31, a rotating shaft 42 connected to the connector 41, a butterfly plate 43 rotatably connected to the rotating shaft 42, and a spring 44 connected to the rotating shaft 42. Ball valve 3 is provided with a protrusion 32 that abuts against the butterfly plate 43. The spring 44 drives the butterfly plate 43 to rotate and abuts against the protrusion 32 to form a seal, so that fluid in channel 31 can pass through in one direction.

[0029] Spring 44 extends to the edge of butterfly plate 43. Limiting element 46 is provided on butterfly plate 43. Limiting element 46 is used to limit the offset of spring 44, thereby avoiding interference between spring 44 and channel 31.

[0030] The connector 41 can be connected to the channel 31 inside the ball valve 3 by welding, bolt fixing, pin fixing, etc. The valve seat 2 is fixed. When the valve stem 5 drives the ball valve 3 to rotate to different opening degrees, the inner wall of the valve seat 2 and the outer wall of the ball valve 3 form a dynamic seal. The flow rate can be adjusted by changing the flow area of ​​the fluid through the channel 31. In one possibility, when the external driving fluid conveying equipment (centrifugal pump, centrifugal compressor, variable frequency water pump, etc.) stops operating, the fluid will flow back and impact the butterfly plate 43. The butterfly plate 43 will automatically close the channel 31 under reverse pressure. The check valve 4 used in this application is a wafer type. Other check valves 4 that automatically close the channel 31 under reverse pressure (swing type, lift type, etc.) can also be used in this application.

[0031] The forward-flowing fluid pushes the disc 43 to rotate around the shaft 42 to open the channel 31. The spring 44 stores energy. When the flow is reversed, the spring 44 releases energy to drive the disc 43 to rotate in the opposite direction until the edge of the disc 43 forms a seal with the protrusion 32 in the channel 31. This prevents the fluid from flowing back to the external fluid conveying equipment and avoids problems such as short circuits in the equipment. The contact surface between the protrusion 32 and the disc 43 can be designed as a slope, an arc, or a plane. The force of the spring 44 and the fluid pressure work together on the disc 43 to enhance the sealing effect.

[0032] The limiting component 46 can be welded to the surface of the butterfly plate 43. The spring 44 extends to the edge of the butterfly plate 43 to enhance the force acting on the butterfly plate 43, so that the butterfly plate 43 can better contact the protrusion 32 and form a better seal. For springs 44 with small contact surfaces with the butterfly plate 43, such as cylindrical springs, they are prone to slipping when the butterfly plate 43 rotates. The spring 44 is prone to wear with the inner wall of the ball valve 3 or interference with the rotation of the butterfly plate 43 and the formation of a seal with the protrusion 32, thus affecting the sealing performance. The limiting component 46 is set to limit the spring 44 to avoid interference with the channel 31.

[0033] Compared to existing fluid control systems that use a series connection of ball valve 3 and check valve 4 to achieve flow control and unidirectional flow, this invention installs check valve 4 within ball valve 3. By reducing the area occupied by the valve core, the system is simplified, making this invention suitable for fluid delivery systems with limited space. Furthermore, when fluid delivery stops, ball valve 3 can remain open, and check valve 4 can prevent backflow. When check valve 4 has been used for a long time, and impurities accumulate in the fluid or it becomes worn and ineffective, fluid flow can be cut off by closing ball valve 3, thus ensuring the safety of the fluid system and facilitating maintenance by workers.

[0034] Preferably, the check valve 4 further includes a cylindrical pin 45, which is connected to the connector 41 and is used to prevent direct collision between the multiple discs 43 during rotation.

[0035] The cylindrical pin 45 is connected to the connector 41 and is located between the rotation trajectories of adjacent butterfly plates 43. The rotating butterfly plates 43 collide with the cylindrical pin 45, thereby avoiding direct collision between the butterfly plates 43. When the cylindrical pin 45 is mainly used to prevent collision, the cylindrical pin 45 can be made of an elastic material to buffer the collision force between the butterfly plates 43 and the cylindrical pin 45, protect the butterfly plates 43, and avoid deformation or damage to the sealing surface caused by direct collision between the butterfly plates 43, ensuring that the check valve 4 still has good sealing performance after long-term use. If it also has a channel 31 for connecting the connector 41 to the inner wall of the ball valve 3, a rigid material is preferred.

[0036] Preferably, a compensation component 6 is provided between the valve body 1 and the valve seat 2. The compensation component 6 includes a sealing ring 61, which is used to seal the gap between the valve body 1 and the valve seat 2.

[0037] The sealing ring 61 can be made of an elastic material and fill the annular gap between the valve body 1 and the valve seat 2. When the fluid is transported in the fluid delivery system, vibration will occur, and the valve body 1 and the valve seat 2 will wear and easily create a gap. At this time, the sealing ring 61 will undergo elastic deformation along with the gap between the valve seat 2 and the valve body 1, thereby forming a dynamic seal and reducing or eliminating the gap between the valve body 1 and the valve seat 2. At the same time, the sealing ring 61 can also be made of an inelastic material. When the valve seat 2 moves slightly relative to the valve body 1, the sealing ring 61 and the valve seat 2 will always be in contact, preventing the valve seat 2 from moving further. At the same time, the sealing ring 61 and the valve seat 2 will always be in a tight state, thereby sealing the gap between the valve seat 2 and the valve body 1.

[0038] Preferably, the compensation component 6 further includes an adjusting pad 62 and an elastic element 63. Both the elastic element 63 and the adjusting pad 62 are disposed between the valve seat 2 and the valve body 1. The elastic element 63 is used to ensure that the adjusting pad 62 fits tightly against the sealing ring 61.

[0039] The elastic element 63 can be made of elastic material such as spring 44 or disc spring. The valve body 1 and valve seat 2 are arranged in the order of elastic element 63, adjusting pad 62 and sealing ring 61. When the ball valve 3 rotates or during fluid transportation, vibration or other factors may cause a gap between the valve body 1 and valve seat 2. When the gap is large, the elastic element 63 provides elastic force to make the adjusting pad 62 squeeze the sealing ring 61, so that the sealing ring 61 fits tightly against the valve seat 2, thereby compensating for the seal.

[0040] Preferably, the adjusting pad 62 compresses the sealing ring 61 to cause the valve seat 2 to adhere tightly to the ball valve 3.

[0041] The valve seat 2 is movable relative to the ball valve 3. The adjusting shim 62 squeezes the sealing ring 61, and the sealing ring 61 moves inward to abut against the valve seat 2. At the same time, it drives the valve seat 2 to press tightly against the ball valve 3, thereby preventing gaps between the ball valve 3 and the valve seat 2 from causing leakage. In some harsh environments, it can resist leakage caused by vibration and prevent impurities from entering between the valve seat 2 and the valve body 1 through the gap.

[0042] Preferably, the valve body 1 is provided with a groove 11, which accommodates at least a portion of the elastic element 63.

[0043] The depth of the groove 11 is set to accommodate at least part of the elastic element 63, while the other part abuts against the adjusting pad 62. The groove 11 is used to fix the elastic element 63 so that the elastic element 63 does not shift, thereby providing elastic force against the adjusting pad 62 so that the adjusting pad 62 can fit tightly against the sealing ring 61.

[0044] Preferably, the valve seat 2 is provided with a receiving groove 21 for accommodating the sealing ring 61. At least a portion of the adjusting pad 62 extends into the receiving groove 21, and the sealing ring 61 is squeezed by the elastic force of the elastic member 63 to compress and tighten the sealing ring 61 between the valve seat 2 and the inner wall of the valve body 1.

[0045] The sealing ring 61 is made of an elastic material. The receiving groove 21 is an annular receiving groove 21 on the valve seat 2. Part of the adjusting pad 62 extends into the receiving groove 21 and abuts against the sealing ring 61. The elastic force of the elastic element 63 is transmitted through the adjusting pad 62, causing the sealing ring 61 to undergo compression deformation in the receiving groove 21, thereby tightening the space between the valve seat 2 and the inner wall of the valve body 1. While reducing the movement between the valve seat 2 and the valve body 1, it can also dynamically compensate for the sealing performance between the valve seat 2 and the valve body 1.

[0046] The above description is merely a preferred embodiment of this utility model. The scope of protection of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this utility model should also be considered within its protection scope.

Claims

1. A valve that combines the functions of a ball valve and a check valve, characterized in that, It includes a valve body, a valve seat installed inside the valve body, a ball valve, a check valve installed inside the ball valve, and a valve stem for controlling the ball valve; The valve seat is used to support the ball valve and cooperates with the ball valve for sealing; the ball valve is provided with a passage for fluid to pass through, and the check valve is installed in the passage; the valve seat and the ball valve cooperate with each other to control the flow rate of fluid into the passage, and the check valve is used to control the unidirectional flow of fluid in the passage; The check valve includes a connector fixedly connected to the inner wall of the channel, a rotating shaft connected to the connector, a butterfly plate rotatably connected to the rotating shaft, and a spring connected to the rotating shaft. The ball valve is provided with a protrusion that abuts against the butterfly plate. The spring drives the butterfly plate to rotate and abuts against the protrusion to form a seal, so that the fluid in the channel can pass through in one direction. The spring extends to the edge of the butterfly plate, and a limiting member is provided on the butterfly plate to limit the spring's offset, thereby preventing the spring from interfering with the channel.

2. The valve according to claim 1, characterized in that, The check valve also includes a cylindrical pin, which is connected to the connector and is used to prevent direct collision between multiple discs during rotation.

3. The valve according to any one of claims 1 or 2, characterized in that, A compensation component is provided between the valve body and the valve seat. The compensation component includes a sealing ring, which is used to seal the gap between the valve body and the valve seat.

4. The valve according to claim 3, characterized in that, The compensation assembly also includes an adjusting pad and an elastic element, both of which are located between the valve seat and the valve body. The elastic element is used to ensure that the adjusting pad and the sealing ring fit tightly together.

5. The valve according to claim 4, characterized in that, The adjusting pad compresses the sealing ring to make the valve seat fit tightly against the ball valve.

6. A valve that combines the functions of a ball valve and a check valve according to claim 4, characterized in that, The valve body is provided with a groove, which at least accommodates a portion of the elastic element.

7. A valve that combines the functions of a ball valve and a check valve according to claim 5, characterized in that, The valve seat is provided with a receiving groove for accommodating the sealing ring. At least a portion of the adjusting shim extends into the receiving groove and is compressed by the elastic force of the elastic element to compress and tighten the sealing ring between the valve seat and the inner wall of the valve body.

8. A valve that combines the functions of a ball valve and a check valve according to claim 6, characterized in that, The valve seat is provided with a receiving groove for accommodating the sealing ring. At least a portion of the adjusting shim extends into the receiving groove and is compressed by the elastic force of the elastic element to compress and tighten the sealing ring between the valve seat and the inner wall of the valve body.

Images