A sealed and adjustable valve

Abstract

A sealed and adjustable valve provided by the present invention comprises a valve stem, a valve body and a valve plate. A longitudinal first installation groove and a transverse second installation groove are provided in the valve body. The valve stem is inserted into the first installation groove, and a pair of valve plates are fixedly connected to the valve stem. The valve plates are installed in the second installation groove. The second installation groove is further provided with an annular clamping groove, and a positioning ring is installed in the annular clamping groove. A screw fixing plate, a valve seat pressing plate and a valve seat bottom plate are sequentially installed horizontally between the positioning ring and the valve plate. Third installation grooves are further provided at the upper and lower ends of the screw fixing plate. Torque screws and locking screws are installed in the third installation grooves. A threaded hole is provided at the bottom end face of the torque screw, and the locking screw is installed in the threaded hole. The torque screw abuts against the valve seat pressing plate. Threaded grooves adapted to the outer surfaces of the torque screws and the locking screws are provided in the third installation grooves. The present invention solves the defects of high equipment precision requirements and serious wear of the seal pair structure of the existing butterfly valve.

Description

Technical Field

[0001] The present invention relates to the field of butterfly valves, and particularly to a valve with adjustable sealing Background Art

[0002] As the core component of the valve, the main sealing pair usually involves a valve seat, a sealing gasket and its positioning and fixing device. The structural performance of the sealing pair directly determines the comprehensive performance of the valve. For soft-sealed valves used in most working conditions, whether it is a centerline valve or an eccentric valve, whether it is a linear stroke or an angular stroke valve type, its sealing principle is basically achieved by the interference fit between the valve seat and the valve plate. The ability of the valve to bear the medium pressure depends, in addition to the characteristics of the material itself, on the magnitude of the sealing specific pressure (i.e., the interference amount of the fit). The higher the specific pressure, the stronger the pressure bearing capacity, and the greater the required sealing torque or sealing pressure. The comprehensive cost of the valve and its control system will also increase accordingly. Considering the versatility, replaceability and reliability of valve manufacturing, a relatively fixed main sealing pair structure and a relatively conservative high sealing specific pressure are adopted for various valves. This fixed sealing pair structure not only requires higher machining and assembly precision for related parts, especially the strict control of the size and shape of the sealing surface greatly increases the manufacturing cost, but also the high sealing interference amount increases the wear of the main sealing pair and reduces the service life of the valve. Summary of the Invention

[0003] (I) Technical Problems to be Solved

[0004] The object of the present invention is to provide a valve with adjustable sealing, which solves the defects of high equipment precision requirements and serious wear of the sealing pair structure of the existing butterfly valve.

[0005] (II) Technical Solutions

[0006] To solve the above technical problems, a sealed and adjustable valve provided by the present invention includes a valve stem, a valve body, and a valve plate. A longitudinal first installation groove and a transverse second installation groove are provided in the valve body. The valve stem is inserted into the first installation groove, and a pair of valve plates are fixedly connected to the valve stem. The valve plates are installed in the second installation groove. The second installation groove is also provided with an annular clamping groove, and a positioning ring is installed in the annular clamping groove. A ring-shaped screw fixing plate, a ring-shaped valve seat pressing plate, and a ring-shaped valve seat bottom plate are sequentially installed horizontally between the positioning ring and the valve plate. Third installation grooves are further provided at the upper and lower ends of the screw fixing plate. Torque screws and locking screws are installed in the third installation grooves. A threaded hole is provided at the bottom end face of the torque screw, and the locking screw is installed in the threaded hole. The torque screw abuts against the valve seat pressing plate. Threaded grooves adapted to the outer surfaces of the torque screw and the locking screw are provided in the third installation groove. In the present invention, the valve seat pressing plate is fixed by a combination of a positioning ring and a screw fixing plate. During use, a first set of torque screws are screwed into the screw fixing plate. When the screws contact the valve seat pressing plate, the screw fixing plate is pushed to move in the opposite direction until it contacts the positioning ring and the pressing plate stops moving leftward. As the screw torque continues to increase, the main seal pair composed of the valve seat, its bottom plate, and the pressing plate moves rightward, compressing the elastic sealing gasket. When the screws reach the specified torque, locking screws are screwed in to prevent loosening. At this time, the valve seat should stop at the theoretical sealing position of the spherical sealing surface of the valve plate to achieve sealing under standard pressure. Its adjustable sealing structure solves the defects of high equipment precision requirements and serious wear of the seal pair structure of the existing butterfly valve.

[0007] Preferably, the outer surface of the valve seat pressing plate facing one side of the valve seat bottom plate is recessed inward to form a first groove.

[0008] Preferably, the outer surface of the valve seat bottom plate facing one side of the valve seat pressing plate is recessed inward to form a second groove.

[0009] Preferably, the sealed and adjustable valve further includes a sealed valve seat. The first groove faces the second groove to form a sealing cavity, and the sealed valve seat is installed in the sealing cavity.

[0010] Preferably, a spherical sealing surface is provided on the outer side surface of the valve plate. An inner sealing surface adapted to the spherical sealing surface is provided on the inner side of the valve seat bottom plate.

[0011] Preferably, a first annular groove is further provided on one side of the valve seat bottom plate facing the valve body, and a spring sealing gasket is installed in the first annular groove.

[0012] Preferably, a second annular groove is provided on the top wall of the valve seat pressing plate facing the top of the valve body, and a valve seat pressing plate sealing ring is installed in the second annular groove.

[0013] (III) Beneficial effects

[0014] A sealed and adjustable valve provided by the present invention has the following advantages:

[0015] In the present invention, a first group of torque screws are screwed into the screw fixing plate. When the screws contact the valve seat pressing plate, the screw fixing plate is pushed to move in the opposite direction until it contacts the positioning ring and then the pressing plate stops moving leftward. As the screw torque continues to increase, the main sealing pair composed of the valve seat, its bottom plate and the pressing plate moves rightward to compress the elastic sealing washer. When the screws reach the specified torque, locking screws are screwed in to prevent loosening. At this time, the valve seat should stop at the theoretical sealing position of the spherical sealing surface of the valve plate to achieve sealing under standard pressure; its adjustable sealing structure solves the defects of high equipment precision requirements and serious wear of the sealing pair structure of the existing butterfly valve. The present invention adjusts the sealing specific pressure targeted, thus effectively solving the problem of valve leakage; this adjustment structure can have better effects in environments such as low temperature, high temperature, low pressure, and high pressure after replacing valve seats of various different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of Embodiment 1 of the sealed and adjustable valve of the present invention;

[0017] Figure 2 is a partially enlarged structural view of Part A of Embodiment 1 of the sealed and adjustable valve of the present invention;

[0018] Figure 3 is an enlarged view of the sealing structure of Embodiment 2 of the sealed and adjustable valve of the present invention.

[0019] 1. Valve plate, 2. First installation groove, 3. Third installation groove, 4. Valve body, 5. Valve stem, 6. Perforation, 6. Locking screw, 7. Torque screw, 9. Valve seat pressing plate, 10. Spring sealing washer, 11. Valve seat bottom plate, 12. Sealing valve seat, 13. Screw fixing plate, 14. Positioning ring, 15. Card slot, 16. Third installation groove, 17. First groove, 18. Second groove, 19. First annular groove, 20. Second annular groove, 21. Heating cavity, 22. Electric heating wire, 23. Magnetic coil, 24. Power supply, 25. Control unit, 26. Sealing ring, 27. Magnet, Spherical sealing surface a, Inner sealing surface b. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0021] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. The present invention is installed both horizontally and vertically and is simplifiedly described according to the orientation. Figure 1 for the convenience of description.

[0022] Embodiment 1

[0023] As Figure 1 and Figure 2 shown, a sealing adjustable valve provided by the present invention includes: a valve stem 5, a valve body 4, a valve plate 1, and a sealing valve seat 12; a longitudinal first installation groove 2 and a transverse second installation groove 3 are provided in the valve body, the valve stem is inserted into the first installation groove, and a pair of valve plates are fixedly connected to the valve stem; the valve plates are installed in the second installation groove; an annular clamping groove 15 is further provided in the second installation groove, and a positioning ring 14 is installed in the annular clamping groove; a ring-shaped screw fixing plate 13, a ring-shaped valve seat pressing plate 9, and a ring-shaped valve seat bottom plate 11 are sequentially installed horizontally between the positioning ring and the valve plate; third installation grooves 16 are further provided at the upper and lower ends of the screw fixing plate; torque screws 7 and locking screws 6 are installed in the third installation grooves, a threaded hole is provided at the bottom end face of the torque screw, and the locking screw is installed in the threaded hole; the torque screw abuts against the valve seat pressing plate; threaded grooves adapted to the outer surfaces of the torque screw and the locking screw are provided in the third installation groove. A spherical sealing surface a is provided on the outer side surface of the valve plate; an inner sealing surface b adapted to the spherical sealing surface is provided on the inner side of the valve seat bottom plate.

[0024] The outer surface of the valve seat pressing plate on the side facing the valve seat bottom plate is recessed inward to form a first groove 17. The outer surface of the valve seat bottom plate on the side facing the valve seat pressing plate is recessed inward to form a second groove 18. The first groove faces the second groove to form a sealing cavity, and the sealing valve seat is installed in the sealing cavity.

[0025] A first annular groove 19 is further provided on one side of the valve seat bottom plate facing the valve body, and a spring sealing gasket 10 (or a metal wound gasket) is installed in the first annular groove. A second annular groove 20 is further provided on the top wall of the valve seat pressing plate facing the top of the valve body, and a valve seat pressing plate sealing ring 8 is installed in the second annular groove.

[0026] When this embodiment is implemented, during installation, the valve plate is first rotated so that the left plane is parallel to the external flange plane on the left side of the valve body, so that the inner sealing surface of the valve seat is evenly in contact with the spherical sealing surface of the valve plate 2. Then the spring sealing gasket, valve seat bottom plate, sealing valve seat, and valve seat pressure plate are installed in sequence. The valve seat is firmly stuck in the cavity formed by the bottom plate and the pressure plate to ensure that the valve seat cannot be blown out when the rated pressure from any direction on the left or right side is applied to the valve seat. The valve seat pressure plate is fixed by a combination of a positioning ring and a screw fixing plate. When in use, the first set of torque screws is screwed into the screw fixing plate. When the screw contacts the valve seat pressure plate, it pushes the screw fixing plate to move in the opposite direction until the pressure plate stops moving to the left after contacting the positioning ring. As the torque of the screw continues to increase, the main sealing pair composed of the valve seat, its base plate and the pressure plate moves to the right, compressing the elastic sealing gasket. When the screw reaches the specified torque, the locking screw is screwed in to prevent loosening. At this time, the valve seat should stop at the theoretical sealing position of the spherical sealing surface of the valve plate to achieve sealing under standard pressure.

[0027] When the valve is subjected to positive pressure from the left side, the valve seat pressure plate sealing ring can effectively prevent the pressure from reaching the other side of the valve through the pressure plate, so that the sealing pair moves to the right as a whole after being pressurized. Because there is an adjustment gap between the valve seat bottom plate and the valve body, the rightward movement of the sealing pair has more margin, so that the valve seat is closer to the spherical center of the valve plate, the sealing interference (specific pressure) gradually increases, and the sealing effect is better. After the pressure is reduced or stopped, the sealing pair is restored to the theoretical position by the elastic force of the sealing gasket. In the actual working conditions with low pressure, the torque of the screw can also be appropriately reduced to increase the adjustment gap, thereby reducing the sealing specific pressure and increasing the service life of the sealing pair.

[0028] Example 2

[0029] The difference between Example 2 and Example 1 is that Figure 3 As shown, a heating chamber 21 is provided in the torque screw, and a heating wire 22 is provided in the heating chamber; a magnetic coil 23 is installed in the side wall outside the heating chamber; a power supply 24 and a control unit 25 connected to the power supply are installed in the torque screw, and the two ends of the magnetic coil are connected to the control unit through a point-to-line connection; a magnet 27 inserted into the heating chamber is provided on the valve seat pressure plate, and a sealing ring 26 is provided on the periphery of the magnet, and the sealing ring is used to keep the heating chamber sealed, and nitrogen is flushed in the heating chamber; the power supply is electrically connected to the heating wire through an electric conductor. The control unit of this embodiment adopts a control chip or a PLC (modem), which is used to receive the current generated by the magnet inserted into the magnetic coil, and then adjust the power supply so that the current that makes the heating wire heat is output, so that the air pressure in the heating chamber increases, which plays a buffering role, so that the extrusion force of the valve seat pressure plate on the torque screw is relieved.

[0030] When this embodiment is implemented, when the torque screw is not rotated, the magnet is not inserted into the magnetic coil. When the torque screw is rotated so that the magnet on the valve seat pressing plate penetrates into the magnetic coil, different magnitudes of current are generated as the magnet penetrates. The control unit receives the current generated by the insertion of the magnet into the magnetic coil, and then adjusts the power supply to output a current that causes the heating wire to heat up, increasing the air pressure in the heating chamber. This plays a buffering role, relieving the squeezing force of the valve seat pressing plate on the torque screw; making the stroke process of the torque screw smoother and preventing the torque screw from slipping and affecting the adjustment of the sealing gap of the valve body.

[0031] The above embodiments are only used to illustrate the present invention. The mechanisms, connection methods, etc. of each component can be changed. Any equivalent transformation and improvement based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A sealed and adjustable valve, characterized in that, Including: A valve stem, a valve body and a valve plate; a longitudinal first installation groove and a transverse second installation groove are provided in the valve body, the valve stem is inserted into the first installation groove, and a pair of valve plates are fixedly connected to the valve stem; the valve plates are installed in the second installation groove; an annular clamping groove is further provided in the second installation groove, and a positioning ring is installed in the annular clamping groove; a ring-shaped screw fixing plate, a ring-shaped valve seat pressing plate and a ring-shaped valve seat bottom plate are sequentially installed horizontally between the positioning ring and the valve plate; third installation grooves are further provided at the upper and lower ends of the screw fixing plate; torque screws and locking screws are installed in the third installation grooves, a threaded hole is provided at the bottom end face of the torque screw, and the locking screw is installed in the threaded hole; the torque screw abuts against the valve seat pressing plate; threaded grooves adapted to the outer surfaces of the torque screw and the locking screw are provided in the third installation groove; a first groove is formed by inward depression of the outer surface of the valve seat pressing plate on the side facing the valve seat bottom plate; a second groove is formed by inward depression of the outer surface of the valve seat bottom plate on the side facing the valve seat pressing plate; a sealing valve seat is further included; the first groove and the second groove face each other to form a sealing cavity, and the sealing valve seat is installed in the sealing cavity; a spherical sealing surface is provided on the outer side surface of the valve plate; an inner sealing surface adapted to the spherical sealing surface is provided on the inner side of the valve seat bottom plate; a first annular groove is further provided on one side of the valve seat bottom plate facing the valve body, and a spring sealing washer is installed in the first annular groove; a second annular groove is further provided on the top wall of the valve seat pressing plate facing the top of the valve body, and a valve seat pressing plate sealing ring is installed in the second annular groove; a first group of torque screws are screwed into the screw fixing plate. When the screws contact the valve seat pressing plate, the screw fixing plate is pushed to move in the opposite direction until it contacts the positioning ring and then the pressing plate stops moving to the left; as the torque of the screws continuously increases, the main sealing pair composed of the valve seat, its bottom plate and the pressing plate moves to the right, compressing the elastic sealing washer. When the screws reach the specified torque, the locking screws are screwed in to prevent loosening. At this time, the valve seat should stop at the theoretical sealing position of the spherical sealing surface of the valve plate to achieve sealing under standard pressure. A heating cavity is provided in the torque screw, and an electric heating wire is provided in the heating cavity; a magnetic coil is installed in the side wall outside the heating cavity; a power supply and a control unit connected to the power supply are installed in the torque screw, and both ends of the magnetic coil are externally connected to the control unit through point-to-line; a magnet inserted into the heating cavity is provided on the valve seat pressing plate, and a sealing ring is provided on the outer periphery of the magnet for keeping the heating cavity sealed, and nitrogen is filled in the heating cavity; the power supply is electrically connected to the electric heating wire through an electric wire. The control unit uses a control chip or a modem, which is used to receive the current generated by the insertion of the magnet into the magnetic coil, and then adjust the power supply to output a current that makes the electric heating wire heat up, so that the air pressure in the heating cavity increases, which plays a buffering role and relieves the extrusion force of the valve seat pressing plate on the torque screw.

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