Integrated combined type compact-operation double-sealing gate valve

Abstract

An inflow hole and an outflow hole are formed in the two ends of a valve body T, the valve body is provided with a first fluid control system K1 and a second fluid control system K2, and the axis of a valve rod of the K1 system and the axis of a valve rod of the K2 system are located on the same plane or perpendicular in space. The K1 system and the K2 system can drive the valve rod and the gate plate to move along the axis of the valve rod through respective hand wheels to achieve control over opening and closing of fluid, an anti-rotation indicating block is arranged on the valve rod to display the position of the gate plate, so that the gate plate does linear motion without torsion, and the gate plate form of the K1 system and the K2 system is a wedge-type single gate plate or a wedge-type double gate plate. The device is reliable in sealing, compact in structure, small in installation space, free of welding seams of multi-valve connection, short in construction period and low in welding seam heat treatment and inspection cost.

Description

Technical Field

[0001] The invention belongs to the field of valve design and manufacturing, and in particular relates to an integrated combined compact operation double-sealed gate check valve. Background Art

[0002] In order to ensure the reliability of sealing, the existing process pipelines under harsh working conditions generally use two or more single switch valves (such as gate valves, globe valves, ball valves, check valves, etc.) for welding to achieve multiple sealing and process requirements, which has problems such as a large number of welds, large installation space, long construction period, high weld heat treatment and inspection costs, etc. The existing single switch valves (such as gate valves and ball valves) do not have the function of check valves. Summary of the invention

[0003] The object of the present invention is to provide an integrated combined compact operation double sealing gate check valve with compact structure and reliable sealing.

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a solution for an integrated combined compact operation double-sealed gate check valve and its derivative valves, which are as follows: The invention relates to an integrated combined compact operation double sealing gate check valve, wherein the two ends of the valve body have an inflow hole and an outflow hole, and the inflow hole and the outflow hole are coaxial holes that are connected, i.e., through holes. The invention is characterized in that: the middle of the valve body has a first central hole for accommodating a first gate plate and a second central hole for accommodating a second gate plate, and a first check valve seat and a streamlined curved hole group are installed between the inflow hole and the first central hole, and a valve seat with a valve seat and a disc frame as an integral body is matched with a disc with a guide curve whose center of gravity is close to the valve seat sealing surface, a spring is installed, and a threaded spring seat and a locking nut are tightened on the disc to form an assembly, and then the assembly is installed into the inlet of the valve body to form the first check valve; a pair of valve seat mounting holes are provided in the first central hole and the through hole area, and the valve seat mounting holes are adjacent to the streamlined curved hole group, and the first central hole area contains a groove for guiding the first gate plate and various surfaces and bolt holes for installing the valve cover and the gasket, so as to install the first wedge-shaped valve seat, the first gate plate, the first valve cover ... A first fluid control system consisting of a gasket, a first valve stem, a first stuffing, a first indicator block, a first support column, and a first hand wheel, and the first fluid control system and the valve body form a first wedge-type gate valve; a pair of valve seat mounting holes are provided in the second middle hole and through hole area, and the second middle hole area contains a groove for guiding the second gate plate and various surfaces and bolt holes for mounting the valve cover and the gasket, which are used to install a second fluid control system consisting of a second wedge-shaped valve seat, a second gate plate, a second valve cover, a second gasket, a second valve stem, a second stuffing, a second indicator block, a second support column, and a second hand wheel, and the second fluid control system and the valve body form a second wedge-type gate valve; a second check valve seat and a streamlined curved hole group are installed between the second middle hole and the outflow hole, and the streamlined curved hole group is adjacent to the valve seat mounting hole, and the valve seat is installed, and the outlet axial flow check valve disc with front and rear guides, a spring, a bracket, and a spring seat assembly form a second check valve; The valve stem axis of the first fluid control system is in the same plane or perpendicular to the valve stem axis of the second fluid control system. Both the first fluid control system and the second fluid control system can control the opening and closing of the fluid by driving the valve stem and the gate plate along the valve stem axis through their respective hand wheels. There is an anti-rotation indicator on the valve stem to display the position of the gate plate so that the gate plate moves in a straight line without being subjected to torque. The gate plates of the first fluid control system and the second fluid control system are in the form of a wedge-type single gate plate or a wedge-type double gate plate.

[0005] The connection between the valve stem and the gate of the first fluid control system and the second fluid control system has interchangeable structural dimensions. One or two pairs of the wedge-shaped valve seats of the first fluid control system and the second fluid control system can be replaced with parallel valve seats, and the wedge-shaped gates can be replaced with corresponding parallel double gates. The wedge-shaped gates and the parallel double gates have the same T-slots, gate center heights and gate widths. Interchangeable assembly realizes a two-position, three-type gate, six-category double-gate, double-check valve.

[0006] Removing the first check valve or the second check valve forms a double-gate single check valve.

[0007] The first wedge gate valve or the second wedge gate valve is removed to form a single-gate double check valve.

[0008] The first check valve or the second check valve is removed, and the first wedge gate valve or the second wedge gate valve is removed to form a single-gate single-check valve.

[0009] The first wedge-type gate valve and the second wedge-type gate valve are removed to form a double axial flow check valve with a shorter structure.

[0010] The first check valve and the second check valve are removed, and the first wedge-type gate valve is removed. The threaded hole sealing cone surface and the flow channel curve of the valve seat of the top-mounted axial flow check valve are processed on the first middle hole, the inlet hole side and the through hole area. The overall assembly of the top-mounted check valve consisting of a valve disc with a hexagonal head and a guide rod and a hexagonal hole threaded valve seat with a static and dynamic sealing surface matching the valve disc is installed into the valve body. The valve cover is processed with the same low-resistance streamline surface as the valve body. The valve cover of the above-mentioned overall assembly and the bolts, gaskets and nuts constitute a top-mounted check valve system. The second wedge-type gate valve is kept to form a single-gate single-check valve with a top-mounted check valve that can be maintained online.

[0011] The valve body is a compact pressure self-sealing 8-shaped valve body with a middle section. The operating device is a combination of a spur gear bevel gear and a handwheel. It is equipped with a bevel gear operating device with a hanging stem nut and a planetary spur gear operating device with a hanging stem nut. The two handwheels are staggered in space. The lowest surface of the handwheel of the bevel gear operating system is higher than the highest surface of the bevel gear operating system. The guide indicator plate is connected to the valve stem for anti-rotation to display the gate position, so that the gate can move smoothly without torque. The bevel gear operating system and the spur gear operating system have the same hanging nut seat and are installed in the bevel gear box seat and the spur gear box seat respectively. The two boxes have the same connection size and can be connected to two identical adapters for interchangeable connection. When fully open, The top end of the valve stem is inside the protective cover. The through hole of the valve body is processed with a valve seat hole for installing a wedge-shaped valve seat and a valve seat hole for installing the first check valve and the second check valve. The two groups of identical parallel center holes of the valve body are processed with grooves that can guide the positioning when the gate moves, and the surfaces on which the self-sealing valve cover, self-sealing ring and threaded gland are installed. The valve cover upper mounting parts composed of the valve cover, valve stem, self-sealing ring, threaded gland, guide indicator plate, support column sealing fastening parts and connecting plate installed in the two groups of center holes of the valve body are combined with the bevel gear operating device to form a control system, and combined with the planetary spur gear operating device to form a control system. After the coarse-thread long-thread valve stem nut is tightened with the hanging nut seat, it is fixed and locked with a fine-thread locking nut.

[0012] The gate valve seat installed in the through hole of the valve body is replaced with the valve seat of the parallel disc gate valve. The gate and the parallel double disc gate have the same size of T-slot connected to the valve stem and the center height for interchange. The replaced parallel double disc gate moves in the same groove of the valve body for positioning and guiding, thus forming a compact self-sealing valve cover positive bevel gear operated parallel double gate double check valve. The valve body is changed to a welded end valve body, one of the double check valves is removed, the gate valve seat is kept, and the valve stem is replaced with the same single gate plate, the split double wedge plate, and the two pairs of double wedge plates are moved in the same groove of the valve body for positioning and guiding, that is, a compact self-sealing valve cover positive bevel gear-operated double wedge double gate single check valve; Three types of double gate check valves with different gate forms operated by positive bevel gears, in which the positive gears are replaced with two bevel gears to form a compact self-sealing valve cover double bevel gear operated double gate check valve; Three types of double gate check valves with different gate forms operated by positive bevel gears, in which the bevel gears are replaced with two spur gears to form a compact self-sealing bonnet double spur gear operated double gate check valve; The double-gate check valve with three different gate forms operated by positive bevel gears has the housing and internal reduction gear of the spur gear operating mechanism removed, the nut seat replaced with a handwheel nut seat, and the handwheel replaced with a large-diameter handwheel. The lowest surface of the large handwheel exceeds the highest surface of the system so it can be operated, becoming a compact self-sealing valve cover bevel gear handwheel operated double-gate check valve with a bevel gear and a large handwheel.

[0013] Processed into two-end flanges or other connection forms as required, the valve cover is in the form of low-temperature extension or bellows; Available in small forged steel manual valve configurations or larger casting configurations and pneumatic and electric operated configurations.

[0014] The application of the above solution of the present invention has the following advantages: The one-piece valve body double-sealed gate check valve has reliable sealing, compact structure and small installation space, no welds connecting multiple valves, short construction period, and low weld heat treatment and inspection costs.

[0015] According to the requirements of the pipeline system, it is convenient to manufacture and adjust the sealing order and valve type, as well as install top-mounted axial flow check valves for online maintenance; it is convenient to manufacture extended bonnets for ultra-low temperature conditions and bellows long bonnets for low leakage conditions. Different functional requirements and processing, universal design can make the same valve body assembled into a variety of valves.

[0016] The three types of operating devices, bevel gear, spur gear and large handwheel, have universal connection dimensions. Through the combination of different types of positions and directions, they can adapt to various operating requirements on site. The gear box body that does not bear the axial force of the valve stem has a stronger load-bearing capacity. The coarse and fine thread stem nuts and locking nuts with different pitches are easy to process and disassemble, and the gear operating device is cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of a flat stem double-gate double-check valve.

[0018] Figure 2 It is a schematic diagram of the front cross-section of the valve body of a double-gate double-check valve with a bolted bonnet flat surface.

[0019] Figure 3 It is a cross-sectional view of a flat stem single gate double gate double check valve.

[0020] Figure 4 yes Figure 3 Magnified image of HA in .

[0021] Figure 5 yes Figure 3 HD enlarged image.

[0022] Figure 6 It is a cross-sectional view of a double-disc double-gate double-check valve with a flat valve stem separated.

[0023] Figure 7 It is a cross-sectional view of a double-disc double-gate double-check valve with parallel flat stems.

[0024] Figure 8 It is a three-dimensional and cross-sectional schematic diagram of a spatial valve stem double parallel valve disc double check valve.

[0025] Fig. 9 yes Figure 8 Appearance drawing.

[0026] Fig.10 It is a cross-sectional view of a flat stem single gate double gate single check valve.

[0027] Fig.11 It is a cross-sectional view of a parallel double-disc single-gate double-check valve.

[0028] Fig.12 It is a cross-sectional view of a wedge-type single-disc single-gate single-check valve.

[0029] Fig.13 It is a cross-sectional view of a single-gate single-top check valve.

[0030] Fig.14 It is a compact self-sealing bonnet positive bevel gear operated double gate check valve.

[0031] Fig.15 It is a compact self-sealing bonnet positive bevel gear operated double gate check valve fully open cross-section view.

[0032] Fig.16 yes Fig.15 AA section view.

[0033] Fig.17 Cross-section of a compact self-sealing bonnet, positive bevel gear operated parallel plate double gate check valve.

[0034] Fig.18 Cross-sectional view of a compact self-sealing bonnet, positive bevel gear operated double wedge double gate check valve.

[0035] Fig.19Outline drawing of compact self-sealing bonnet double bevel gear operated double gate check valve.

[0036] Fig. 20 Schematic diagram of a compact self-sealing bonnet double spur gear operated double gate check valve.

[0037] Fig.21 Schematic diagram of a compact self-sealing bonnet bevel gear handwheel operated double gate check valve. DETAILED DESCRIPTION

[0038] See also Figures 1 to 7, an integrated combined compact operation double sealing gate check valve, the two ends of the valve body 1 are provided with an inflow hole 2 and an outflow hole 3, the inflow hole 2 and the outflow hole 3 are interconnected coaxial holes (referred to as through holes), the middle of the valve body is provided with a first center hole 5 for accommodating a first gate plate 4 and a second center hole 6 for accommodating a second gate plate 4, between the inflow hole 2 and the first center hole 5 there is a first check valve seat installation and a streamlined curved hole group 7, a valve seat 8 with a valve seat and a disc frame as an integral body is matched with a valve disc 9 with a guide curve whose center of gravity is close to the valve seat sealing surface, a spring 10 is installed and tightened on the valve disc with a threaded spring seat 11 and a locking nut 12 to form an assembly, and then installed into the inlet of the valve body to form a first check valve 13. There is a pair of valve seat mounting holes 14 in the first center hole 5 and the through hole area, and the valve seat mounting holes 14 are adjacent to the streamlined curved hole group 7. The first center hole 5 area contains a groove for guiding the gate 3 and various surfaces and bolt holes for installing the valve cover 15 and the gasket 16, which are used to install the first fluid control system (the first fluid control system is referred to as K1) composed of parts such as the wedge-shaped valve seat 17, the gate 3, the valve cover 15, the gasket 16, the valve stem 23, the packing 18, the indicator block 19, the support column 20, and the hand wheel 21. K1 and the valve body constitute the first wedge-type gate valve. There is a pair of valve seat mounting holes in the second center hole 6 and the through hole area. The second center hole 6 area contains a groove that can guide the gate plate 4 and the surfaces and bolt holes for the valve cover 15 and the gasket 16 to install the second fluid control system (hereinafter referred to as K2) composed of wedge-shaped valve seat 22, gate plate, valve cover, gasket, valve stem 24, packing 25, indicator block 26, support column 27, hand wheel 28 and other parts. K2 and the valve body form the second wedge gate valve. Between the second center hole 6 and the outflow hole 3, there is a second check valve seat installation and streamlined curved hole group 29. The streamlined curved hole group 29 is adjacent to the valve seat mounting hole 14, and the valve seat 30 is installed. The outlet axial flow check valve disc 31 with front and rear guidance, the spring 32, the bracket 33, and the spring seat 34 assembly form the second check valve 35. The valve stem axis of the K1 system is in the same plane or vertical in space as the valve stem axis of the K2 system. Both the K1 and K2 systems can control the opening and closing of the fluid by driving the valve stem and the gate along the valve stem axis through their respective hand wheels. There are anti-rotation indicators on the valve stem to show the position of the gate. The gates of the K1 and K2 systems can be wedge-shaped single gates or wedge-shaped double gates 36, 37. The connection between the valve stem and the gate is an interchangeable structural size. One or two pairs of wedge-shaped valve seats in the K1 and K2 systems can be replaced with parallel valve seats 38, 39, and the wedge-shaped gates 3, 4 can be replaced with corresponding parallel double gates 40, 41. The wedge-shaped gates and the parallel double gates have the same T-slots, gate center heights and gate widths, so they can be interchangeably assembled to realize two-position three-type gate six-type double-gate double-check valves.

[0039] Furthermore, in a double-gate double-check fully configured valve, the first check valve is removed and the second check valve is retained to form a double-gate single check valve. The removal of the first check valve or the second check valve can be selected as needed.

[0040] Furthermore, the double gate double check full configuration valve removes the first wedge gate valve or the second wedge gate valve to form Fig.11 Single gate double check valve; remove the first wedge gate valve and the second wedge gate valve to form a double axial flow check valve.

[0041] Further, the double gate double check full configuration valve removes the second check valve, retains the first check valve, removes the first wedge gate valve, and retains the second wedge gate valve to form Fig.12 Single gate single check valve.

[0042] Furthermore, the double-gate double-check fully configured valve can remove the first check valve and the second check valve, and remove the first wedge-type gate valve, and process the threaded hole sealing cone surface and flow channel curve of the valve seat of the top-mounted axial flow check valve on the first middle hole 5 and the inlet hole side and the through hole area, and install the overall assembly of the top-mounted check valve consisting of the valve seat 42, valve disc 43, spring 44, spring seat 45, and nut into the valve body. The matching surface of the valve seat and the valve disc is hexagonal, and the head of the valve disc is also hexagonal, so that the threaded valve seat and the valve body can be tightened and sealed. The valve cover 46 is processed with the same low-resistance streamline surface as the valve body. The above-mentioned overall assembly and the valve cover and the bolts, gaskets and nuts constitute a top-mounted check valve system, and the second wedge-type gate valve is formed. Fig.13 Single gate single check valve with top entry check valve that can be repaired online.

[0043] Furthermore, the valve body and bonnet of the double sealing valve can be modified from a bolted connection structure to a compact pressure self-sealing valve body with an 8-shaped middle section, and the operating device is a different combination of a spur gear, a bevel gear and a hand wheel for operation in a compact space. Fig.14 and Fig.15 , 16They are respectively the appearance diagram and the fully open cross-sectional diagram of a compact self-sealing valve cover positive bevel gear operated double gate check valve, and a compact pressure self-sealing valve body 47 with a middle section. The compact valve body connected in the middle section has low processing difficulty and cost, but the handwheel operation space is small. For easy operation, a bevel gear operating device 48 with a hanging valve stem nut and a planetary spur gear operating device 49 with a hanging valve stem nut are configured. The handwheels 50 and 51 are staggered in space, and the lowest surface of the handwheel 51 is higher than the highest surface of the bevel gear operating device 48, so it can be operated. The guide indicator plate 52 is anti-rotationally connected to the valve stem 53 and displays the gate position so that the gate can move smoothly without being subjected to torque. The bevel gear operating system and the spur gear operating system have the same hanging nut seat 54 and are respectively installed in the bevel gear box seat 55 and the spur gear box seat 56. The two boxes have the same connection size and are connected to the two same receiving plates 57 in a replaceable manner. When fully opened, the top of the valve stem is inside the protective cover 58. The through hole of the valve body is processed with a valve seat hole for installing a wedge-shaped valve seat 59 and a valve seat hole for installing a check valve system. The two groups of the same parallel center holes of the valve body 47 are processed with grooves for positioning and guiding when the gate moves, and the surfaces on which the self-sealing valve cover 60, the self-sealing ring 61 and the threaded gland 62 are installed. The valve cover, valve stem, self-sealing ring, threaded gland, guide indicator plate, support column 63 installed in the two groups of center holes of the valve body The valve cover upper mounting component composed of sealing and fastening parts and a connecting plate is combined with a bevel gear operating device to form a control system 64, and is combined with a planetary spur gear operating device to form a control system 65. Because the lower hanging nut seat 54 and the plane needle bearing 66 are fixed in the bevel gear box seat 70 and the spur gear box seat 68 by the screw cover 67, the housings 69 and 71 of the bevel gear operating device and the planetary spur gear operating device do not bear the axial force of the valve stem. After the coarse-pitch long-thread valve stem nut 72 is tightened with the lower hanging nut seat 54, it is fixed and locked with a fine-pitch locking nut 73, which has a better cost-effectiveness. The deceleration torque amplification system of the bevel gear operating device and the planetary spur gear operating device can easily operate the hand wheel to open and close the valve.

[0044] Furthermore, Fig.15 , 16 The gate valve seat 59 installed in the valve body through hole of the compact self-sealing bonnet double gate double check valve can be replaced by Fig.17 Parallel disc gate valve seat 74, Fig.15 , 16 Gate 75 and Fig.17 The parallel double valve disc gate 76 has the same size of T-slot connected to the valve stem and the center height for interchangeability. The replaced parallel double valve disc gate 76 can be positioned and guided in the same groove of the valve body. Fig.17 The other parts are the same Fig.15 , 16 , Fig.17 The compact self-sealing bonnet positive bevel gear operated parallel double gate double check valve enables different functional valve types to be derived by replacing a few parts.

[0045] Furthermore, Fig.15 , 16 The single flange valve body of the compact self-sealing bonnet double gate double check valve can be changed to Fig.18 Weld end valve body, remove one of the double check valves, keep Fig.15 , 16 The gate valve seat 59 is replaced with Fig.15 , 16 The split double wedge plates 77 with the same stem T-head connection dimensions and sealing surface opening dimensions as the single gate can be used for positioning and guiding movement in the same groove of the valve body. Fig.18 The other parts are the same Fig.15 , 16 , that is, Fig.18 The compact self-sealing bonnet positive bevel gear-operated double wedge double gate single check valve also enables the development of valves with different functions by replacing a few parts.

[0046] Furthermore, Figure 15-18 The three types of double-gate check valves with different gate forms operated by positive bevel gears can all have their spur gears replaced with two bevel gears to form the following Fig.19 Compact self-sealing bonnet double bevel gear operated double gate check valve.

[0047] Furthermore, Figure 15-18 The three types of double-gate check valves with different gate forms operated by positive bevel gears can all have their bevel gears replaced with two spur gears to form a Fig. 20 Compact self-sealing bonnet double spur gear operated double gate check valve.

[0048] Furthermore, Figure 15-18 For the three types of double-gate check valves with different gate forms operated by positive bevel gears, the housing and internal reduction gear of the spur gear operating mechanism can be removed, the nut seat is replaced with a handwheel nut seat 78, and the handwheel is replaced with a large-diameter handwheel 79. The lowest surface of the large handwheel exceeds the highest surface of the BG system, so it can be operated. Fig.21 Compact self-sealing bonnet with one bevel gear and one large handwheel. Bevel gear handwheel operated double gate check valve.

[0049] The connection mode of the integrated combined compact operation double sealing gate check valve can be processed into two-end flanges as required, and the valve cover can be in the form of a low-temperature extension or a bellows.

[0050] The integrated combined compact operation double-sealed gate check valve is a small forged steel manual valve structure, and can also be a larger-sized casting structure or other operating structures such as pneumatic and electric.

[0051] Also shown is a connector 78 for the parallel double gates.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can use the above disclosed technical solution content to make slight modifications or changes to equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments within the spirit and principles of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An integrated compact operation double-sealed gate check valve, the two ends of the valve body having an inlet hole and an outlet hole, the inlet hole and the outlet hole are coaxial holes that communicate with each other, i.e., through holes, characterized in that: The middle of the valve body is provided with a first center hole for accommodating the first gate plate and a second center hole for accommodating the second gate plate. A first check valve seat and a streamlined curved hole group are installed between the inflow hole and the first center hole. The valve seat with the valve seat and valve disc frame as an integral body is matched with a valve disc with a guide curve whose center of gravity is close to the valve seat sealing surface. A spring is installed and tightened on the valve disc with a threaded spring seat and a locking nut to form an assembly, which is then installed into the inlet of the valve body to form the first check valve; a pair of valve seat mounting holes are provided in the first center hole and the through hole area, and the valve seat mounting holes are adjacent to the streamlined curved hole group. The first center hole area contains a groove for guiding the first gate plate and various surfaces and bolt holes for installing the valve cover and gasket, which are used to install the first wedge-shaped valve seat, the first gate plate, the first valve cover, the first gasket, the first valve stem, the first stuffing, the first indicator block, the first support column, the first hand The first fluid control system is composed of a second wedge-shaped valve seat, a second gate, a second valve cover, a second gasket, a second valve stem, a second packing, a second indicator block, a second support column, and a second hand wheel, and the first fluid control system and the valve body form a first wedge-type gate valve; a pair of valve seat mounting holes are provided in the second center hole and the through hole area, and the second center hole area contains a groove for guiding the second gate plate and various surfaces and bolt holes for installing the valve cover and the gasket, which are used to install the second fluid control system composed of the second wedge-shaped valve seat, the second gate plate, the second valve cover, the second gasket, the second valve stem, the second packing, the second indicator block, the second support column, and the second hand wheel, and the second fluid control system and the valve body form a second wedge-type gate valve; a second check valve seat and a streamlined curved hole group are installed between the second center hole and the outflow hole, and the streamlined curved hole group is adjacent to the valve seat mounting hole, and the valve seat is installed, and the outlet axial flow check valve disc with front and rear guides, the spring, the bracket, and the spring seat assembly form a second check valve; The valve stem axis of the first fluid control system is in the same plane or perpendicular to the valve stem axis of the second fluid control system. Both the first fluid control system and the second fluid control system can control the opening and closing of the fluid by driving the valve stem and the gate plate along the valve stem axis through their respective hand wheels. There is an anti-rotation indicator on the valve stem to display the position of the gate plate so that the gate plate moves in a straight line without being subjected to torque. The gate plates of the first fluid control system and the second fluid control system are in the form of a wedge-type single gate plate or a wedge-type double gate plate.

2. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: The connection between the valve stem and the gate of the first fluid control system and the second fluid control system has interchangeable structural dimensions. One or two pairs of the wedge-shaped valve seats of the first fluid control system and the second fluid control system can be replaced with parallel valve seats, and the wedge-shaped gates can be replaced with corresponding parallel double gates. The wedge-shaped gates and the parallel double gates have the same T-slots, gate center heights and gate widths. Interchangeable assembly realizes a two-position, three-type gate, six-category double-gate, double-check valve.

3. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: Removing the first check valve or the second check valve forms a double-gate single check valve.

4. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: Removing the first wedge gate valve or the second wedge gate valve forms a single-gate double check valve.

5. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: The first check valve or the second check valve is removed, and the first wedge gate valve or the second wedge gate valve is removed to form a single-gate single-check valve.

6. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: The first wedge-type gate valve and the second wedge-type gate valve are removed to form a double axial flow check valve with a shorter structure.

7. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: The first check valve and the second check valve are removed, and the first wedge-type gate valve is removed. The threaded hole sealing cone surface and the flow channel curve of the valve seat of the top-mounted axial flow check valve are processed on the first middle hole, the inlet hole side and the through hole area. The overall assembly of the top-mounted check valve consisting of a valve disc with a hexagonal head and a guide rod and a hexagonal hole threaded valve seat with a static and dynamic sealing surface matching the valve disc is installed into the valve body. The valve cover is processed with the same low-resistance streamline surface as the valve body. The valve cover of the above-mentioned overall assembly and the bolts, gaskets and nuts constitute a top-mounted check valve system. The second wedge-type gate valve is kept to form a single-gate single-check valve with a top-mounted check valve that can be maintained online.

8. The integrated compact operation double seal gate check valve according to claim 1 is characterized by: The valve body is a compact pressure self-sealing 8-shaped valve body with a middle section. The operating device is a combination of a spur gear bevel gear and a handwheel. It is equipped with a bevel gear operating device with a hanging stem nut and a planetary spur gear operating device with a hanging stem nut. The two handwheels are staggered in space. The lowest surface of the handwheel of the bevel gear operating system is higher than the highest surface of the bevel gear operating system. The guide indicator plate is connected to the valve stem for anti-rotation to display the gate position, so that the gate can move smoothly without torque. The bevel gear operating system and the spur gear operating system have the same hanging nut seat and are installed in the bevel gear box seat and the spur gear box seat respectively. The two boxes have the same connection size and can be connected to two identical adapters for interchangeable connection. When fully open, The top end of the valve stem is inside the protective cover. The through hole of the valve body is processed with a valve seat hole for installing a wedge-shaped valve seat and a valve seat hole for installing the first check valve and the second check valve. The two groups of identical parallel center holes of the valve body are processed with grooves that can guide the positioning when the gate moves, and the surfaces on which the self-sealing valve cover, self-sealing ring and threaded gland are installed. The valve cover upper mounting parts composed of the valve cover, valve stem, self-sealing ring, threaded gland, guide indicator plate, support column sealing fastening parts and connecting plate installed in the two groups of center holes of the valve body are combined with the bevel gear operating device to form a control system, and combined with the planetary spur gear operating device to form a control system. After the coarse-thread long-thread valve stem nut is tightened with the hanging nut seat, it is fixed and locked with a fine-thread locking nut.

9. The integrated compact operation double seal gate check valve according to claim 8 is characterized by: The gate valve seat installed in the through hole of the valve body is replaced with the valve seat of the parallel disc gate valve. The gate and the parallel double disc gate have the same size of T-slot connected to the valve stem and the center height for interchange. The replaced parallel double disc gate moves in the same groove of the valve body for positioning and guiding, thus forming a compact self-sealing valve cover positive bevel gear operated parallel double gate double check valve. The valve body is changed to a welded end valve body, one of the double check valves is removed, the gate valve seat is kept, and the valve stem is replaced with the same single gate plate, the split double wedge plate, and the two pairs of double wedge plates are moved in the same groove of the valve body for positioning and guiding, that is, a compact self-sealing valve cover positive bevel gear-operated double wedge double gate single check valve; Three types of double gate check valves with different gate forms operated by positive bevel gears, in which the positive gears are replaced with two bevel gears to form a compact self-sealing valve cover double bevel gear operated double gate check valve; Three types of double gate check valves with different gate forms operated by positive bevel gears, in which the bevel gears are replaced with two spur gears to form a compact self-sealing bonnet double spur gear operated double gate check valve; The double-gate check valves with three different gate forms operated by positive bevel gears are equipped with a bevel gear and a large handwheel, and the housing and internal reduction gear of the spur gear operating mechanism are removed. The nut seat is replaced with a handwheel nut seat, and the handwheel is replaced with a large-diameter handwheel. The lowest surface of the large handwheel exceeds the highest surface of the system, forming a compact self-sealing valve cover bevel gear handwheel operated double-gate check valve with a bevel gear and a large handwheel.

10. The integrated compact operation double seal gate check valve according to claim 8 is characterized by: Processed into two-end flanges or other connection forms as required, the valve cover is in the form of low-temperature extension or bellows; Available in small forged steel manual valve configurations or larger casting configurations and pneumatic and electric operated configurations.

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