CN215763411U

CN215763411U - Duplex flow regulating valve

Info

Publication number: CN215763411U
Application number: CN202122411510.6U
Authority: CN
Inventors: 谢正泽; 陈继江; 沙涛; 朱志刚; 吴平; 李增有; 黄亚光; 陈浩; 张炎
Original assignee: Afa Flow Control Co ltd
Current assignee: Afa Flow Control Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-02-08
Anticipated expiration: 2031-10-08

Abstract

The utility model provides a duplex flow regulating valve, comprising: the valve comprises a valve body, a valve seat, a C-shaped ball body, a valve cover, a valve rod, a lower shaft, an elastic sealing structure and a packing sealing structure; the valve body is integrally arranged and is provided with two valve cavities, the upper parts of the two valve cavities are both provided with upper openings, and the lower parts of the two valve cavities are provided with lower openings; the first ball body and the second ball body are respectively arranged on a lower shaft penetrating through the valve body; the two valve covers are respectively covered on the upper opening part of the valve body; the valve rod is fixedly connected with the C-shaped ball body in the valve cavity after being inserted into the vertical through hole. According to the duplex flow regulating valve, when the medium transported in the flow channel needs to be regulated, the valve rod connected with the second ball body is rotated, so that the second ball body is driven to rotate, and the flow is regulated according to the rotating angle of the valve rod; because the second spheroid is non-eccentric ball valve, the valve ball sealing surface on the second spheroid can reach the full-sealing with the valve seat sealing surface on the disk seat, so the second spheroid can carry out accurate regulation to flow.

Description

Duplex flow regulating valve

Technical Field

The utility model relates to the technical field of ball valves, in particular to a duplex flow regulating valve.

Background

With the wide application of hydropower technology, hydropower stations are built more and more, large hydropower stations such as three gorges hydropower stations, pueraria dam hydropower stations, stream luodie hydropower stations and the like are built in China at present, but the demand of people on electricity cannot be met, the construction of hydroelectric power stations in China is developing in a large scale at present, and various valves are important components in the construction of hydropower stations, especially large-caliber high-pressure flow regulating valves.

When the flow of water in a pipeline is adjusted by a common flow adjusting valve in the prior art, the adaptive pressure range is narrow, and when the pressure difference value of two sides of a ball valve is large, the sealing performance of the ball valve is affected, the service life of the ball valve is shortened, and the ball valve and the pipeline are affected.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the technical defects of narrow pressure range and small pressure bearing capacity of the flow regulating valve in the prior art, so that the dual-linkage flow regulating valve which is wide in pressure range, good in pressure bearing capacity and long in service life is provided.

To this end, the present invention provides a duplex flow regulating valve, comprising:

the valve body is integrally arranged and provided with two valve cavities which are connected in series, and after the two valve cavities are connected in series, one end of the valve body is provided with a fluid inlet, and the other end of the valve body is provided with a fluid outlet; an upper opening is formed right above each of the two valve cavities, and a lower opening is formed right below each of the two valve cavities;

the C-shaped sphere is divided into a first sphere and a second sphere; the upper end and the lower end of the first sphere are provided with grooves which are rotatably arranged in the valve cavity close to one side of the fluid inlet; the upper end and the lower end of the second ball body are provided with grooves which are rotatably arranged in the valve cavity close to one side of the fluid outlet; the first ball body and the second ball body are provided with valve ball sealing surfaces;

two valve seats, one is arranged on the inner wall of the valve body close to one side of the fluid inlet; the other valve seat is arranged on the inner wall of the valve body close to the space between the two valve cavities, and both valve seats are provided with valve seat sealing surfaces which can be in sealing contact connection with the valve ball sealing surfaces;

the two valve covers are respectively arranged at the two upper opening positions, vertical through holes for the valve rod to penetrate through are formed in the middle of the two valve covers, and a support is fixedly arranged at the top ends of the two valve covers;

the two lower shafts respectively penetrate through the two lower openings and are inserted into the valve body part to be in sealing contact connection with the groove at the bottom end of the C-shaped ball body, and the C-shaped ball body can rotate relative to the lower shafts;

two valve rods are respectively inserted into the vertical through holes, one end of each valve rod vertically penetrates through the vertical through hole downwards and is fixed at the upper end of the C-shaped ball body, and the other end of each valve rod vertically penetrates through the support upwards;

two elastic sealing structures are arranged, and one elastic sealing structure is arranged on the inner wall of the valve body, close to one side of the fluid inlet, of the valve seat; the other is arranged on the inner wall of the valve body between the two valve cavities;

and the two packing sealing structures are respectively arranged on the inner walls of the two vertical through holes close to one end of the bracket.

As a preferable scheme, the first ball is an eccentric ball, and a circular through hole is arranged in the center of the valve seat matched with the first ball; the second ball is a non-eccentric ball, and a triangular through hole is formed in the center of the valve seat matched with the second ball;

as a preferable scheme, the two valve seats are detachably arranged on the valve body through a pressure plate; the valve seat is provided with a first annular bulge, the valve body is provided with a first annular recess corresponding to the first annular bulge, and the first annular recess is opposite to the first annular bulge; the pressure plate is detachably arranged on the valve body, is provided with a second annular bulge and is arranged corresponding to the first annular bulge, and an extrusion space for the pressure plate to extrude and install the first annular bulge is reserved after the first annular bulge is arranged in the first annular recess;

external threads are arranged on the peripheral surface of the outer side of the pressing plate; an inner thread is arranged on the inner side wall of the first annular recess opposite to the outer thread; the pressing plate is screwed into the extrusion space.

As a preferable scheme, first gaskets are arranged at the joints of the two valve covers and the upper openings of the valve body, and a plurality of integrally formed threaded shafts are arranged around the two upper openings of the valve body; through holes are formed in the positions, corresponding to the threaded shafts, of the two valve covers, and the threaded shafts are fixed through nuts after penetrating through the through holes in the valve covers.

Preferably, the positions of the two upper openings are higher than the connecting position of the C-shaped sphere and the valve rod by a certain distance; the inner diameters of the two upper openings are larger than the diameter of the C-shaped sphere.

As a preferable aspect, the elastic sealing structure includes:

the check ring is arranged on the inner wall of the valve body at one side far away from the fluid outlet;

the valve seat pressing sleeve is arranged between the retainer ring and the valve seat and is circumferentially arranged along the inner wall of the valve body;

the wave-shaped plate spring has certain elasticity, can generate elastic deformation and is arranged between the check ring and the valve seat pressing sleeve;

and the graphite sealing ring is arranged between the valve seat and the valve seat pressing sleeve and is suitable for eliminating a gap between the valve seat and the valve seat pressing sleeve.

As a preferable aspect, the packing structure includes:

the annular cavity is arranged on the valve body at one end, close to the support, of the vertical through hole and is circumferentially arranged along the vertical through hole;

the packing pad is sleeved on the valve rod and is placed at the bottom of the annular cavity;

the filler is sleeved on the valve rod and is arranged on the filler pad;

and the packing pressing plate is sleeved on the valve rod, is positioned above the packing and is fixedly connected with the valve cover.

As a preferable scheme, a plurality of threaded holes are formed in the circumferential direction of the valve rod at the overlapped part of the valve cover and the outer edge of the packing press plate; the support is arranged on the packing pressure plate, and the support and the packing pressure plate are fixedly arranged on the valve cover through bolts.

As a preferred scheme, the lower shaft penetrates through the valve body and is inserted into the groove at the bottom end of the C-shaped ball body, a first shaft sleeve is arranged at the joint of the lower shaft and the bottom end of the valve body, and a second gasket is arranged at the joint of the lower shaft and the groove at the bottom end of the C-shaped ball body.

As a preferable scheme, the valve rod penetrates through the vertical through hole and then is fixedly arranged in the groove at the upper end of the C-shaped sphere, and a second shaft sleeve is arranged between the valve rod and the groove at the upper end of the C-shaped sphere.

The technical scheme provided by the utility model has the following advantages:

1. the utility model relates to a duplex flow regulating valve, which comprises: the valve comprises a valve body, a valve seat, a C-shaped ball body, a valve cover, a valve rod, a lower shaft, an elastic sealing structure and a packing sealing structure; the valve body is integrally arranged and is provided with two valve cavities, the upper parts of the two valve cavities are both provided with upper openings, and the lower parts of the two valve cavities are provided with lower openings; the first ball body and the second ball body are respectively arranged on a lower shaft penetrating through the valve body; the two valve covers are respectively covered at the two upper opening positions and connected with the valve body; the valve rod is fixedly connected with the C-shaped ball body in the valve cavity after being inserted into the vertical through hole.

The duplex flow regulating valve of the utility model is characterized in that firstly, an installed ball valve is connected with pipelines at two ends in a sealing way; then the valve rod connected with the first ball body is rotated, the valve rod drives the first ball body to rotate 90 degrees, so that the channel is completely opened, and the medium enters the channel; then the valve rod connected with the second ball body is rotated, and the valve rod drives the second ball body to be opened slowly, so that the medium can pass through the second ball body slowly; namely, the flow is regulated by controlling the rotation angle of the second ball body; when the valve needs to be closed, the first ball body is rotated firstly to cut off the fluid channel, then the second ball body is rotated to close the second ball body, and then the first ball body is rotated to reduce the pressure at two sides; when the ball valve needs to be overhauled, parts in the valve cavity can be overhauled only by detaching the valve cover on the damaged side from the valve body, and pipelines at fluid inlets and fluid outlets at two ends of the ball valve do not need to be moved or detached, so that the workload is reduced, and the working efficiency is improved.

2. According to the duplex flow regulating valve, the first ball body is an eccentric ball body, the second ball body is a non-eccentric ball body, and the eccentric ball valve has the advantages that the friction resistance is small, and the first ball body can be rotated by small torque to open and close the ball valve; the non-eccentric ball valve can accurately adjust the flow, and further can accurately adjust the flow, so that the working efficiency is improved.

3. The duplex flow regulating valve also comprises a pressure plate, wherein both valve seats are fixed on the inner wall of the valve body by the pressure plate; the middle part of the valve seat is provided with a first annular bulge, the position of the valve body close to the first annular is provided with a first annular recess, the inner wall of the valve body is provided with internal threads, the first annular bulge and the first annular recess are matched and connected to form an extrusion space for inserting a pressing plate, the pressing plate is provided with a second annular bulge, and the outer wall of the pressing plate is also provided with external threads; when the clamp plate passes through the spiro union of internal thread and external screw thread, revolve soon and get into the extrusion space after, the protruding and first annular of second annular is protruding to be in the same place, both can realize spacing to the disk seat structure, can avoid the clamp plate to the spheroidal direction of C type again outstanding more, and then avoids causing the influence to the spheroidal rotation of C type under the circumstances of guaranteeing spacing intensity.

4. According to the duplex flow regulating valve, the periphery of the upper opening of the valve body is uniformly provided with the threaded holes, the valve cover is provided with the limiting through holes corresponding to the threaded holes, the joint of the valve cover and the valve body is also provided with the first gasket, and the bolt penetrates through the limiting through holes and the first gasket and then is in threaded connection with the threaded holes. So set up, can strengthen the intensity that the valve is connected, increase the leakproofness between valve gap and the valve body.

5. According to the duplex flow regulating valve, the position of the valve cover connected with the valve body is a certain distance higher than the position of the C-shaped ball connected with the valve rod, the upper end and the lower end of the first ball are provided with grooves which can be rotatably arranged in the valve cavity close to one side of the fluid inlet, and the first ball is arranged close to one side of the fluid inlet; the upper end and the lower end of the second ball body are provided with grooves which can be rotatably arranged in the valve cavity close to one side of the fluid outlet, and the second ball body has a certain distance from the fluid outlet; the first ball body and the second ball body have sufficient rotating space in the valve cavity, so that the friction of the ball bodies during opening or closing can be reduced, and when the ball bodies are damaged, enough space is provided for taking out the device in the valve cavity or directly maintaining the device.

6. The utility model relates to a duplex flow regulating valve, an elastic sealing structure comprises: the check ring, the valve seat pressing sleeve, the wave-shaped plate spring and the graphite sealing ring; the check ring can reduce the gap between the valve seat pressing sleeve and the valve body, and the graphite sealing ring can reduce the gap between the valve seat and the valve body; the wave-shaped plate spring can eliminate the clearance generated between the valve seat and the C-shaped ball body due to temperature change, thereby realizing continuous sealing of the ball valve.

7. According to the duplex flow regulating valve, the packing sealing structure is arranged on the inner wall of one end, close to the support, of the vertical through hole, so that the sealing performance between the valve cover and the valve rod can be improved, and the fluid leakage and the environment pollution caused by the fact that the valve rod is rotated frequently to open or close the ball valve are avoided.

8. According to the duplex flow ball valve, the support is pressed on the packing pressing plate and fixed on the valve cover together with the packing pressing plate, so that the support can be fixed, and the packing pressing plate can be protected.

9. According to the duplex flow ball valve, the first shaft sleeve is arranged at the position where the lower shaft is connected with the valve body and inserted into the valve body, and the second gasket is arranged at the position where the lower shaft is connected with the C-shaped ball body; the valve rod penetrates through a second shaft sleeve arranged in a groove at the upper end of the C-shaped sphere; the shaft sleeve can increase the sealing performance of the connection between the shaft sleeve and the shaft, and the second gasket can reduce the friction caused by the rotation of the C-shaped ball body on the lower shaft.

Drawings

To more clearly illustrate the technical solutions in the prior art or the embodiments of the present invention, the drawings used in the description of the prior art or the embodiments are briefly introduced below.

Fig. 1 is an overall structural schematic diagram of a cross-sectional view of a front view of the double-link flow rate regulating valve according to the present embodiment.

Fig. 2 is an overall structural diagram of a cross-sectional view of a right side view of the double-link flow rate regulating valve according to the embodiment.

Fig. 3 is a schematic overall structure diagram of a cross-sectional view of a top view of the double-link flow rate regulating valve according to the embodiment. Fig. 4 is an enlarged schematic view of the structure of the valve seat portion in fig. 2.

Fig. 5 is an enlarged schematic view of a portion a of fig. 1.

Reference numerals: 1. a valve body; 11. a valve cavity; 12. a fluid inlet; 13. a fluid outlet; 14. an upper opening; 15. a lower opening; 16. a first annular recess; 2. a C-shaped sphere; 21. a first sphere; 22. a second sphere; 23. a valve ball sealing surface; 3. a valve seat; 31. a valve seat sealing surface; 32. a first annular projection; 33. a retainer ring; 34. pressing the valve seat; 35. a wave-shaped plate spring; 36. a graphite seal ring; 4. a valve cover; 41. a vertical through hole; 42. a first gasket; 43. an annular cavity; 44. a filler pad; 45. a filler; 46. a packing press plate; 5. a valve stem; 51. a second shaft sleeve; 6. a support; 7. a lower shaft; 71. a first bushing; 72. a second gasket; 8. pressing a plate; 81. a second annular protrusion.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

Examples

The present embodiment provides a dual flow control valve, as shown in fig. 1-2, including: the valve comprises a valve body 1, a C-shaped sphere 2, a valve seat 3, a valve cover 4, a lower shaft 7, a valve rod 5, an elastic sealing structure and a packing sealing structure. The valve body 1 is integrally arranged and provided with two valve cavities 11, after the two valve cavities 11 are connected in series, one end of each valve cavity is provided with a fluid inlet 12, the other end of each valve cavity is provided with a fluid outlet 13, an upper opening 14 is arranged right above the two valve cavities 11, and a lower opening 15 is arranged right below the two valve cavities 11; the C-shaped sphere 2 is divided into a first sphere 21 and a second sphere 22, the two spheres are provided with valve sphere sealing surfaces 23, the upper end and the lower end of each sphere are provided with grooves, and the two spheres are rotatably arranged in the two valve cavities 11 respectively; two valve seats 3 are arranged, one of the two valve seats is arranged on the inner wall of the valve body 1 close to one side of the fluid inlet 12, the other valve seat is arranged on the inner wall of the valve body 1 between the two valve cavities 11, and each of the two valve seats 3 is provided with a valve seat sealing surface 31 which can be in sealing contact connection with the valve ball sealing surface 23; the two valve covers 4 are respectively arranged at the two upper openings 14 of the valve body 1, the middle part of the valve cover is provided with a vertical through hole 41, and the upper end of each valve cover 4 is fixedly provided with a bracket 6; the two lower shafts 7 penetrate through the two lower openings 15 and then are inserted into the concave grooves at the bottoms of the C-shaped spheres 2, and the C-shaped spheres 2 can rotate on the lower shafts 7; the two valve rods 5 are respectively inserted into the two vertical through holes 41, one end of each valve rod penetrates through the vertical through hole 41 and then is fixed in the groove at the upper end of the C-shaped sphere 2, and the other end of each valve rod vertically penetrates upwards through the support arranged on the valve cover 4; the two elastic sealing structures are arranged on the inner side walls of the valve body 1 on one sides of the two valve seats 3 close to the fluid inlet 12; two packing seal structures are arranged on the inner wall of one end of the two vertical through holes 41 close to the bracket 6.

The pair flow control valve of this embodiment adopts the mode of two ball valves series connection to adjust and decompress flow, wherein: the first ball body 21 is an eccentric ball body, and the ball valve is used for controlling the opening and closing of the flow channel; the second ball 22 is a non-eccentric ball, and the ball valve is used for adjusting the flow of the medium in the flow channel; when the medium needs to be closed or opened for transportation, the valve rod 5 connected with the first ball body 21 is rotated, and then the first ball body 21 is driven to rotate, so that the valve ball sealing surface 23 and the valve seat sealing surface 31 are overlapped or separated, and the first ball body 21 is an eccentric ball valve, so that the valve rod 5 can be rotated by a small torque to drive the first ball body 21 to rotate. When the medium transported in the flow channel needs to be adjusted, the valve rod 5 connected with the second ball 22 is rotated to drive the second ball 22 to rotate, and according to the rotating angle of the valve rod 5, the opening degree of the second ball 22 is determined, so that the flow is adjusted; since the second ball 22 is a non-eccentric ball valve, the valve ball sealing surface 23 on the second ball 22 can be fully sealed with the valve seat sealing surface 31 on the valve seat 3, so that the second ball 22 can perform precise flow adjustment. When the pressure at the two ends of the ball valve needs to be adjusted, the first ball body 21 is firstly closed to close the fluid passage, after the medium which has passed through the first ball body 21 passes through the second ball body 22, the second ball body 22 is closed to keep the pressure between the two ball bodies at normal pressure, then the first ball body 21 is opened to enable the medium to enter the valve cavity 11 again, and then the first ball body 21 is closed to further reduce the pressure inside the ball valve.

As shown in fig. 3-4, in the dual-linking flow ball valve of the present embodiment, the first ball 21 is an eccentric ball, and a circular through hole is formed in the center of the valve seat 3; the second ball 22 is a non-eccentric ball, and a triangular through hole is arranged at the center of the valve seat 3 matched with the second ball; the eccentric ball valve has the advantages that the frictional resistance is small, and the first ball body 21 can be rotated by small torque to open and close the ball valve; the non-eccentric ball valve can accurately adjust the flow, and the volume of the circular through hole is larger than that of the triangular through hole, so that the medium passing through the triangular through hole can be reduced, namely the medium passing through the second ball body 22 is less than that passing through the first ball body 21, and the medium flow can be accurately and certainly adjusted by matching with a non-eccentric structure of the second ball body 22.

As shown in fig. 5, both valve seats 3 are detachably mounted on the valve body 1 via a pressure plate 8; the valve seat 3 is provided with a first annular bulge 32, the valve body 1 is provided with a first annular recess 16 corresponding to the first annular bulge 32, and the first annular recess 16 is opposite to the first annular bulge 32; the pressure plate 8 is detachably arranged on the valve body 1, is provided with a second annular bulge 81 and is arranged corresponding to the first annular bulge 32, and an extrusion space for the pressure plate 8 to extrude and install the first annular bulge 32 is reserved after the first annular bulge 32 is arranged in the first annular recess 16; external threads are arranged on the peripheral surface of the outer side of the pressing plate 8; the inner side wall of the first annular recess 16 opposite to the external thread is provided with an internal thread. After the valve seat 3 is installed, the pressing plate 8 and the valve body 1 are screwed to be connected, so that the pressing plate 8 is positioned in the extrusion space; so the installation has solved the problem to the fixed difficulty of disk seat 3 in narrow and small space, and fixed firm, avoids disk seat 3 to 2 one sides removals of C type spheroid, influences the sealed contact connection of valve ball sealing surface 23 and the sealed face 31 of disk seat.

In the duplex flow regulating valve of the embodiment, the joints of the two valve covers 4 and the two upper openings 14 are provided with the first gaskets 42, the peripheries of the two upper openings 14 are provided with a plurality of threaded shafts which are integrally formed with the valve covers 4, through holes are formed in the positions of the two valve covers 4 corresponding to the threaded shafts, and the valve covers 4 are covered on the first gaskets 42 and the valve body 1 and then are connected by bolts; the joint of the valve cover 4 and the valve body 1 is higher than the joint of the C-shaped sphere 2 and the valve rod 5 by a certain distance in the vertical direction, and the inner diameter of the upper opening 14 is larger than the diameter of the C-shaped sphere 2. The strength of the ball valve is improved, the friction between the valve body 1 and the valve cover 4 is reduced, and the scouring of the valve cover 4 and the valve rod 5 at the fluid position is also reduced, so that the ball body can have sufficient rotating space in the valve cavity 11, and the service life of the ball valve is prolonged.

The elastic sealing structure of the duplex flow regulating valve of the embodiment comprises a retainer ring 33, a valve seat pressing sleeve 34, a wave-shaped plate spring 35 and a graphite sealing ring 36. The retainer ring 33 is arranged on one side of the fluid inlet 12 and arranged along the circumferential direction in the valve body 1, so that the gap between the valve body 1 and the valve seat pressing sleeve 34 can be reduced; the wave-shaped plate spring 35 has certain elasticity, is arranged on the side wall of the valve body 1 between the valve seat pressing sleeve 34 and the retainer ring 33, can eliminate a gap between the valve seat 3 and the ball body caused by temperature change, avoids clamping the valve seat 3 and the C-shaped ball body 2, and enables the C-shaped ball body 2 to be normally opened and closed; the valve seat pressing sleeve 34 is arranged on the valve seat 3 close to one side of the wave-shaped plate spring 35; the graphite sealing ring 36 is sleeved on the valve seat 3 and used for reducing the gap between the valve seat 3 and the valve body 1 as well as the valve seat pressing sleeve 34; thereby reducing the clearance between each structure and realizing the continuous sealing of the ball valve.

The packing seal structure includes: an annular cavity 43, a packing pad 44, packing 45, and a packing platen 46; wherein, the annular cavity 43 is arranged on the valve body 1 at one end of the vertical through hole 41 close to the bracket 6; the packing pad 44 and the packing 45 are sleeved on the valve rod 5 and then are respectively placed in the annular cavity 43; the packing press plate 46 is sleeved on the valve rod 5 and then fixed on the valve cover 4. The sealing performance between the valve cover 4 and the valve rod 5 can be improved, and the phenomenon that the valve rod 5 is rotated frequently to open or close the ball valve to cause fluid leakage and environmental pollution is avoided.

A plurality of threaded holes are formed in the valve rod 5 along the circumferential direction of the valve rod at the overlapped part of the valve cover 4 and the outer edge of the packing pressing plate 46, corresponding threaded holes are also formed in the support 6, and after the support 6 is placed on the packing pressing plate 46, the support 6 is fixed on the valve cover 4 through a threaded shaft; not only can fix the bracket 6, but also can protect the packing press plate 46.

In the duplex flow ball valve of the embodiment, a first shaft sleeve 71 is arranged at the position where the lower shaft 7 is connected with the valve body 1, and a second gasket 72 is arranged at the position where the lower shaft 7 is connected with the C-shaped ball body 2; the second gasket can reduce friction caused by the rotation of the C-shaped ball on the lower shaft;

a second shaft sleeve 51 is arranged around the groove at the upper end of the C-shaped sphere 2, and the valve rod 5 passes through the vertical through hole 41 and the second shaft sleeve 51 and then is fixed in the groove at the upper end of the C-shaped sphere 2; the second shaft sleeve 51 can reduce the clearance between the two brackets after the valve rod 5 is inserted into the C-shaped sphere 2, and the sealing performance of the ball valve is improved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. The utility model provides a pair flow control valve which characterized in that: the method comprises the following steps:

the valve body (1) is integrally arranged and is provided with two valve cavities (11), the two valve cavities (11) are arranged in series, one end of each valve cavity (11) is provided with a fluid inlet (12) after being connected in series, and the other end of each valve cavity is provided with a fluid outlet (13); upper openings (14) are formed right above the two valve cavities (11), and lower openings (15) are formed right below the two valve cavities;

the C-shaped sphere (2) is divided into a first sphere (21) and a second sphere (22); grooves are formed in the upper end and the lower end of the first ball body (21) and are rotatably arranged in the valve cavity (11) close to one side of the fluid inlet (12); grooves are formed in the upper end and the lower end of the second ball body (22) and are rotatably arranged in the valve cavity (11) close to one side of the fluid outlet (13); the first and second spheres (21, 22) each having a valve ball sealing surface (23);

the two valve seats (3) are arranged, and one valve seat is arranged on the inner wall of the valve body (1) close to one side of the fluid inlet (12); the other valve seat is arranged on the inner wall of the valve body (1) close to the position between the two valve cavities (11), and both valve seats (3) are provided with valve seat sealing surfaces (31) which can be in sealing contact connection with the valve ball sealing surfaces (23);

the two valve covers (4) are respectively arranged at the positions of the two upper openings (14), vertical through holes (41) for the valve rods (5) to penetrate through are formed in the middle of the two valve covers (4), and a support (6) is fixedly arranged at the top ends of the two valve covers (4);

the two lower shafts (7) respectively penetrate through the two lower openings (15) and are inserted into the valve body (1) to be in sealing contact connection with the groove at the bottom end of the C-shaped ball body (2), and the C-shaped ball body (2) can rotate relative to the lower shafts (7);

two valve rods (5) are respectively inserted into the vertical through holes (41), one end of each valve rod vertically penetrates through the vertical through hole (41) downwards and is fixed at the upper end of the C-shaped sphere (2), and the other end of each valve rod vertically penetrates through the support (6) upwards;

the two elastic sealing structures are arranged, and one elastic sealing structure is arranged on the inner wall of the valve body (1) on one side, close to the fluid inlet (12), of the valve seat (3); the other is arranged on the inner wall of the valve body (1) between the two valve cavities (11);

and two packing sealing structures are arranged on the inner walls of the two vertical through holes (41) close to one end of the support (6).

2. The tandem flow control valve according to claim 1, wherein: the first ball body (21) is an eccentric ball body, and a circular through hole is formed in the center of the valve seat (3) matched with the first ball body; the second ball body (22) is a non-eccentric ball body, and a triangular through hole is formed in the center of the valve seat (3) matched with the second ball body.

3. The dual flow regulator valve of claim 2, wherein: the two valve seats (3) are detachably arranged on the valve body (1) through a pressure plate (8); the valve seat (3) is provided with a first annular bulge (32), a first annular recess (16) corresponding to the first annular bulge (32) is formed in the valve body (1), and the first annular recess (16) is opposite to the first annular bulge (32); the pressure plate (8) is detachably arranged on the valve body (1), is provided with a second annular bulge (81) and is arranged corresponding to the first annular bulge (32), and an extrusion space for extruding and installing the first annular bulge (32) by the pressure plate (8) is reserved after the first annular bulge (32) is arranged in the first annular recess (16);

external threads are arranged on the peripheral surface of the outer side of the pressing plate (8); the inner side wall of the first annular recess (16) opposite to the external thread is provided with an internal thread; the pressure plate (8) is screwed into the extrusion space.

4. The tandem flow control valve according to claim 1, wherein: first gaskets (42) are arranged at the joints of the two valve covers (4) and the upper openings (14) of the valve body (1), and a plurality of integrally formed threaded shafts are arranged on the valve body (1) around the two upper openings (14); through holes are formed in the positions, corresponding to the threaded shafts, of the two valve covers (4), and the threaded shafts are fixed through nuts after penetrating through the through holes in the valve covers (4).

5. The tandem flow control valve according to claim 4, wherein: the positions of the two upper openings (14) are higher than the connecting position of the C-shaped sphere (2) and the valve rod (5) by a certain distance; the inner diameters of the two upper openings (14) are larger than the diameter of the C-shaped sphere (2).

6. The tandem flow control valve according to claim 1, wherein: the elastic sealing structure includes:

the retainer ring (33) is arranged on the inner wall of the valve body (1) on the side far away from the fluid outlet (13);

the valve seat pressing sleeve (34) is arranged between the retainer ring (33) and the valve seat (3) and is circumferentially arranged along the inner wall of the valve body (1);

a wave-shaped plate spring (35) which has a certain elasticity and can generate elastic deformation and is arranged between the retainer ring (33) and the valve seat pressing sleeve (34);

and the graphite sealing ring (36) is arranged between the valve seat (3) and the valve seat pressing sleeve (34) and is suitable for eliminating a gap between the valve seat (3) and the valve seat pressing sleeve (34).

7. The tandem flow control valve according to claim 1, wherein: the packing seal structure includes:

the annular cavity (43) is arranged on the valve body (1) at one end, close to the support (6), of the vertical through hole (41) and is circumferentially arranged along the vertical through hole (41);

the packing pad (44) is sleeved on the valve rod (5) and is placed at the bottom of the annular cavity (43);

the packing (45) is sleeved on the valve rod (5) and is arranged on the packing pad (44);

and the packing pressing plate (46) is sleeved on the valve rod (5), is positioned above the packing (45) and is fixedly connected with the valve cover (4).

8. The tandem flow control valve according to claim 7, wherein: a plurality of threaded holes are formed in the circumferential direction of the valve rod (5) at the overlapping part of the valve cover (4) and the outer edge of the packing pressing plate (46); the support (6) is arranged on the packing pressing plate (46), and the support (6) and the packing pressing plate (46) are fixedly arranged on the valve cover (4) through bolts.

9. The tandem flow control valve according to claim 1, wherein: the lower shaft (7) penetrates through the valve body (1) and is inserted into a groove at the bottom end of the C-shaped ball body (2), a first shaft sleeve (71) is arranged at the joint of the lower shaft (7) and the bottom end of the valve body (1), and a second gasket (72) is arranged at the joint of the groove at the bottom end of the C-shaped ball body (2).

10. The dual flow regulator valve of claim 9, wherein: the valve rod (5) penetrates through the vertical through hole (41) and then is fixedly arranged in a groove at the upper end of the C-shaped sphere (2), and a second shaft sleeve (51) is arranged between the valve rod (5) and the groove at the upper end of the C-shaped sphere (2).