Ferrule plug valve

Abstract

The utility model discloses a ferrule plug valve which comprises a valve body, a valve plug is arranged in the valve body, ferrules are fixedly connected to the top end and the bottom end of the valve plug, a valve rod is fixedly connected to the top end of the valve plug, a valve deck is fixedly connected to the top of the valve body, a sealing mechanism is arranged between the valve deck and the valve plug, and a supporting frame is fixedly connected to the top of the valve body. An operating mechanism is installed on the supporting frame, and the sealing mechanism comprises a PTFE triangular ring. According to the ferrule plug valve, a first positioning end part of a PTFE middle gasket is buckled on the inner wall of a valve body, a second positioning end part of the PTFE middle gasket is buckled on a PTFE triangular ring, and a graphite composite pad is placed between the inner wall of the valve body and the first positioning end part of the PTFE middle gasket; the metal diaphragm covers the graphite composite pad and the top of the first positioning end part and the middle part of the PTFE middle-channel gasket, and the metal diaphragm, the graphite composite pad and the PTFE middle-channel gasket form a sealing pair, so that the sealing effect can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plug valves, in particular to a ferrule plug valve. Background Art

[0002] A plug valve is a rotary valve with a closing member or a plunger shape. By rotating 90 degrees, the passage opening on the valve plug communicates with or separates from the passage opening on the valve body to achieve opening or closing. In the prior art, a middle gasket is installed inside the plug valve for sealing, and after long-term use, the sealing performance of the plug valve is not ideal enough. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a ferrule plug valve, which solves the problem that the sealing performance of the plug valve is not ideal enough after long-term use when a middle gasket is installed inside the plug valve for sealing.

[0004] To achieve the above purposes, the utility model is realized through the following technical solutions: A ferrule plug valve, including a valve body, a valve plug is arranged inside the valve body, ferrule sleeves are fixedly connected to both the top end and the bottom end of the valve plug, a valve rod is fixedly connected to the top end of the valve plug, a valve cover is fixedly connected to the top of the valve body, a sealing mechanism is arranged between the valve cover and the valve plug, a support frame is fixedly connected to the top of the valve body, and an operating mechanism is installed on the support frame;

[0005] The sealing mechanism includes a PTFE triangular ring, a PTFE middle gasket is arranged on the top of the PTFE triangular ring, the PTFE middle gasket includes a middle part, a first positioning end part and a second positioning end part, the first positioning end part is convex downward, the second positioning end part is convex upward to form a triangular groove, a graphite composite gasket is arranged at one end of the PTFE middle gasket, a metal diaphragm is arranged on the top of the PTFE middle gasket and the graphite composite gasket, a positioning pressing block is arranged on the top of one side of the metal diaphragm, a packing seat is arranged on the top of the positioning pressing block, packing is arranged on the top of the packing seat, and a packing cover is arranged on the top of the packing.

[0006] Preferably, the PTFE triangular ring is arranged on the top of the valve plug, the triangular groove of the second positioning end part matches with the PTFE triangular ring, and the first positioning end part matches with the inner wall of the valve body, so as to play a positioning role for both ends of the PTFE middle gasket and prevent the PTFE middle gasket from shifting during use.

[0007] Preferably, the graphite composite gasket is arranged between the inner wall of the valve body and the first positioning end part of the PTFE middle gasket, the metal diaphragm is arranged on the top of the graphite composite gasket, the first positioning end part and the middle part of the PTFE middle gasket. The graphite composite gasket, the metal diaphragm and the PTFE middle gasket form a sealing pair, which can effectively improve the sealing effect.

[0008] Preferably, the positioning pressing block is arranged on the top of the second positioning end of the metal diaphragm and the PTFE middle gasket. An inner groove is formed at one end of the bottom of the positioning pressing block, and the inner groove matches the second positioning end of the PTFE middle gasket, so that the positioning pressing block can position and press the second positioning end of the PTFE middle gasket, enabling it to fit tightly with the PTFE triangular ring.

[0009] Preferably, the packing seat and the packing gland are arranged between the valve cover and the valve stem, and the packing gland is detachably connected to the valve cover through fixing bolts, so that the packing can seal the valve stem.

[0010] Preferably, the operating mechanism includes a worm gear box. An external hexagonal bolt is arranged at the bottom of the worm gear box, and a spring washer and a plain washer are arranged on the external hexagonal bolt. A connecting sleeve is rotatably connected inside the worm gear box. The bottom end of the connecting sleeve is connected to the top end of the valve stem, and a flat key is fixedly connected to the top end of the connecting sleeve. The flat key is driven by a worm gear and a worm to be connected to a hand wheel, which can achieve a good labor-saving effect.

[0011] The utility model provides a ferrule plug valve. Compared with the prior art, it has the following beneficial effects:

[0012] 1. For this ferrule plug valve, by buckling the first positioning end of the PTFE middle gasket on the inner wall of the valve body, buckling the second positioning end of the PTFE middle gasket on the PTFE triangular ring, then placing the graphite composite gasket between the inner wall of the valve body and the first positioning end of the PTFE middle gasket, and covering the metal diaphragm on the top of the graphite composite gasket and the first positioning end and the middle part of the PTFE middle gasket, the metal diaphragm, the graphite composite gasket and the PTFE middle gasket form a sealing pair, which can effectively improve the sealing effect.

[0013] 2. For this ferrule plug valve, the worm gear box is installed and fixed through external hexagonal bolts, and then the hand wheel drives the flat key to rotate through the worm gear and the worm. The rotation of the flat key drives the rotation of the connecting sleeve, and the rotation of the connecting sleeve drives the rotation of the valve stem, which can achieve a good labor-saving effect, thereby effectively improving the operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of the utility model;

[0015] Figure 2 is the structural schematic diagram of the sealing mechanism of the utility model;

[0016] Figure 3 is the structural schematic diagram of the operating mechanism of the utility model.

[0017] In the figure: 1. Valve body; 2. Sealing mechanism; 201. PTFE triangular ring; 202. PTFE middle gasket; 203. Graphite composite gasket; 204. Metal diaphragm; 205. Positioning pressing block; 206. Packing seat; 207. Packing; 208. Packing gland; 3. Ferrule; 4. Valve cover; 5. Fixing bolt; 6. Valve plug; 7. Operating mechanism; 701. Worm gear box; 702. External hexagon bolt; 703. Spring washer; 704. Flat washer; 705. Connecting sleeve; 706. Flat key; 707. Handwheel; 8. Support frame; 9. Valve stem. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1-2 , the present invention provides a technical solution: a ferrule plug valve, including a valve body 1, a valve plug 6 is arranged inside the valve body 1, ferrule 3 is fixedly connected to both the top end and the bottom end of the valve plug 6, a valve stem 9 is fixedly connected to the top end of the valve plug 6, and the valve plug 6 can be rotatably connected to the inner wall of the valve body 1 by means of the ferrule 3, so that the valve plug 6 can be driven to rotate by the valve stem 9. A valve cover 4 is fixedly connected to the top of the valve body 1, a sealing mechanism 2 is arranged between the valve cover 4 and the valve plug 6, a support frame 8 is fixedly connected to the top of the valve body 1, and an operating mechanism 7 is installed on the support frame 8. The sealing effect can be effectively improved through the sealing mechanism 2, and the operating mechanism 7 can play a role in saving effort, enabling users to operate conveniently.

[0020] The sealing mechanism 2 includes a PTFE triangular ring 201. A PTFE middle gasket 202 is provided at the top of the PTFE triangular ring 201. The PTFE middle gasket 202 includes a middle part, a first positioning end part and a second positioning end part. The first positioning end part is provided with a downward protrusion, and the second positioning end part is provided with an upward protrusion to form a triangular groove. The PTFE triangular ring 201 is arranged at the top of the valve plug 6. The triangular groove of the second positioning end part matches the PTFE triangular ring 201, and the first positioning end part matches the inner wall of the valve body 1, so as to position both ends of the PTFE middle gasket 202 and prevent the PTFE middle gasket 202 from shifting during use. A graphite composite gasket 203 is provided at one end of the PTFE middle gasket 202. The graphite composite gasket 203 is punched and processed from a high-strength graphite composite plate PSFD, and has excellent corrosion resistance, high and low temperature resistance, good compression resilience and good strength. Cooperating with the PTFE middle gasket 202 can achieve a good sealing effect, and its own elasticity can play a good role in fixing and limiting the PTFE middle gasket 202. A metal diaphragm 204 is provided at the top of the PTFE middle gasket 202 and the graphite composite gasket 203. The metal diaphragm 204 has good elasticity, can position the second positioning end part of the PTFE middle gasket 202, improve stability, and can improve the sealing effect. The graphite composite gasket 203 is arranged between the inner wall of the valve body 1 and the first positioning end part of the PTFE middle gasket 202. The metal diaphragm 204 is arranged at the top of the graphite composite gasket 203, the first positioning end part and the middle part of the PTFE middle gasket 202. The graphite composite gasket 203, the metal diaphragm 204 and the PTFE middle gasket 202 form a sealing pair, which can effectively improve the sealing effect. A positioning pressing block 205 is provided at the top of one side of the metal diaphragm 204. The positioning pressing block 205 is arranged at the top of the metal diaphragm 204 and the second positioning end part of the PTFE middle gasket 202. An inner groove is opened at one end of the bottom of the positioning pressing block 205, and the inner groove matches the second positioning end part of the PTFE middle gasket 202, so that the positioning pressing block 205 can position and press the second positioning end part of the PTFE middle gasket 202 to make it closely fit with the PTFE triangular ring 201. A packing seat 206 is provided at the top of the positioning pressing block 205. A packing 207 is provided at the top of the packing seat 206. A packing cover 208 is provided at the top of the packing 207. The packing seat 206 and the packing cover 208 are arranged between the valve cover 4 and the valve stem 9, and the packing cover 208 is detachably connected to the valve cover 4 through a fixing bolt 5, so that the packing 207 can be used to seal the valve stem 9.

[0021] Please refer to Figure 1 and Figure 3The operating mechanism 7 includes a worm gear box 701, a hexagonal bolt 702 is provided at the bottom of the worm gear box 701, and a spring washer 703 and a flat washer 704 are provided on the hexagonal bolt 702 to prevent the hexagonal bolt 702 from loosening. A connecting sleeve 705 is rotatably connected inside the worm gear box 701, and the bottom end of the connecting sleeve 705 is connected to the top of the valve stem 9. A flat key 706 is fixedly connected to the top of the connecting sleeve 705. The flat key 706 is connected to a handwheel 707 through a worm gear and a worm gear. The worm gear box 701 can be installed and fixed by the hexagonal bolt 702, and then the handwheel 707 drives the flat key 706 to rotate through the worm gear and worm gear, and the flat key 706 rotates to drive the connecting sleeve 705 to rotate, and the connecting sleeve 705 rotates to drive the valve stem 9 to rotate, which can play a good labor-saving role, thereby effectively improving the convenience of operation.

[0022] During operation, the first positioning end of the PTFE center gasket 202 is buckled on the inner wall of the valve body 1, and the second positioning end of the PTFE center gasket 202 is buckled on the PTFE triangular ring 201, and then the graphite composite gasket 203 is placed between the inner wall of the valve body 1 and the first positioning end of the PTFE center gasket 202. The graphite composite gasket 203 is punched and processed from high-strength graphite composite sheet PSFD, and has excellent corrosion resistance, high and low temperature resistance, good compression resilience, and good strength. It can play a good sealing effect with the PTFE center gasket 202, and its own elasticity can play a good fixing and limiting role for the PTFE center gasket 202. Then the metal diaphragm 204 is covered on the graphite composite gasket 203 and the first positioning end and the top of the middle part of the PTFE center gasket 202. The metal diaphragm 204, the graphite composite gasket 203 and the PTFE center gasket 202 constitute a sealing pair, which can effectively improve the sealing effect.

[0023] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A sleeve plug valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve plug (6) inside, the top and bottom ends of the valve plug (6) are fixedly connected to a ferrule (3), the top of the valve plug (6) is fixedly connected to a valve stem (9), the top of the valve body (1) is fixedly connected to a valve cover (4), a sealing mechanism (2) is provided between the valve cover (4) and the valve plug (6), the top of the valve body (1) is fixedly connected to a support frame (8), and an operating mechanism (7) is installed on the support frame (8); The sealing mechanism (2) comprises a PTFE triangular ring (201), a PTFE mid-way gasket (202) is arranged on the top of the PTFE triangular ring (201), the PTFE mid-way gasket (202) comprises a middle portion, a first positioning end portion and a second positioning end portion, the first positioning end portion is arranged to protrude downward, the second positioning end portion is arranged to protrude upward and form a triangular groove, a graphite composite gasket (203) is arranged on one end of the PTFE mid-way gasket (202), a metal diaphragm (204) is arranged on the top of the PTFE mid-way gasket (202) and the graphite composite gasket (203), a positioning block (205) is arranged on the top of one side of the metal diaphragm (204), a packing seat (206) is arranged on the top of the positioning block (205), a packing (207) is arranged on the top of the packing seat (206), and a packing cover (208) is arranged on the top of the packing (207).

2. The ferrule plug valve according to claim 1, characterized in that: The PTFE triangular ring (201) is arranged on the top of the valve plug (6), the triangular groove of the second positioning end matches the PTFE triangular ring (201), and the first positioning end matches the inner wall of the valve body (1).

3. The ferrule plug valve according to claim 1, characterized in that: The graphite composite gasket (203) is arranged between the inner wall of the valve body (1) and the first positioning end of the PTFE mid-way gasket (202), and the metal diaphragm (204) is arranged on the graphite composite gasket (203) and the first positioning end and the top of the middle part of the PTFE mid-way gasket (202).

4. The ferrule plug valve according to claim 1, characterized in that: The positioning pressing block (205) is arranged on the top of the second positioning end of the metal diaphragm (204) and the PTFE middle gasket (202), and an inner groove is opened at one end of the bottom of the positioning pressing block (205), and the inner groove matches the second positioning end of the PTFE middle gasket (202).

5. The ferrule plug valve according to claim 1, characterized in that: The packing seat (206) and the packing cover (208) are arranged between the valve cover (4) and the valve stem (9), and the packing cover (208) is detachably connected to the valve cover (4) via a fixing bolt (5).

6. The ferrule plug valve according to claim 1, characterized in that: The operating mechanism (7) comprises a worm gear box (701), the bottom of the worm gear box (701) is provided with an external hexagonal bolt (702), and the external hexagonal bolt (702) is provided with a spring washer (703) and a flat washer (704).

7. The ferrule plug valve according to claim 6, characterized in that: A connecting sleeve (705) is rotatably connected inside the worm gear box (701), and the bottom end of the connecting sleeve (705) is connected to the top end of the valve stem (9).

8. The ferrule plug valve according to claim 7, characterized in that: A flat key (706) is fixedly connected to the top of the connecting sleeve (705), and the flat key (706) is connected to a hand wheel (707) through a worm gear and a worm gear.

Images