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CN-224229274-U - Butterfly valve with high reverse sealing performance

CN224229274UCN 224229274 UCN224229274 UCN 224229274UCN-224229274-U

Abstract

The utility model relates to a butterfly valve with high reverse sealing performance, which comprises a valve body, wherein a medium hole is formed in the middle of the valve body, valve body holes are formed in two sides of the medium hole, a support hole is formed in the support, a valve rod is rotatably arranged in the medium hole, the valve body hole and the support hole, a gasket sleeve, a first bushing, a valve plate, a second bushing and a bearing are sequentially sleeved on the valve rod, the first bushing and the second bushing are respectively positioned in the valve body holes on two sides, the bearing is positioned in the support hole, the valve plate is positioned in the medium hole, a pressing ring is arranged on the outer side of the valve plate, a sealing ring is arranged between the valve plate and the pressing ring in a pressing manner, a sealing boss matched with the sealing ring is arranged in the valve body, inner packing is arranged between the first bushing, the second bushing and the valve rod, and outer packing is arranged between the first bushing and the valve body. The bushing and the valve rod are made of forge piece stainless steel, so that the rigidity is enhanced, the deformation of the bushing and the valve rod after being subjected to medium force is reduced, the sealing surface is attached, and the reverse sealing is realized.

Inventors

  • Xi Binfeng
  • BIAN HONGFEI
  • JIN YONGMING

Assignees

  • 无锡宝牛阀业有限公司

Dates

Publication Date
20260512
Application Date
20250521

Claims (8)

  1. 1. The butterfly valve with the high reverse sealing performance comprises a valve body (1), a medium hole is formed in the middle of the valve body (1), two sides of the medium hole are provided with valve body holes, and is characterized in that a support hole is formed in the side surface of the valve body (1), a support hole is formed in the support (11), a valve rod (3) is rotatably installed in the support hole, a gasket (14), a first bushing (4), a valve plate (2), a second bushing (5) and a bearing (6) are sequentially sleeved on the valve rod (3), the first bushing (4) and the second bushing (5) are respectively located in the valve body holes on two sides, the bearing (6) is located in the support hole, the valve plate (2) is located in the medium hole, a pressing ring (8) is installed on the outer side of the valve plate (2), a sealing ring (7) is pressed between the valve plate (2) and the pressing ring (8), sealing bosses (1-1) matched with the sealing ring (7) are arranged in the valve body (1), an inner packing (9) is installed between the first bushing (4) and the valve rod (3), and the second bushing (5) is installed between the first bushing (4) and the valve body (1).
  2. 2. A butterfly valve with high reverse tightness according to claim 1, characterized in that the valve stem (3) is fixedly connected to the valve plate (2) by means of a pin (12).
  3. 3. A butterfly valve with high reverse tightness according to claim 1, characterized in that a clamping plate (13) is arranged at the end of the valve rod (3), and the clamping plate (13), the cushion sleeve (14), the first bushing (4) and the valve plate (2) are axially abutted.
  4. 4. The butterfly valve with high reverse sealing performance according to claim 1, wherein the inner circumferences of the first bushing (4) and the second bushing (5) are provided with a first packing groove, and the outer packing (10) is positioned between the first bushing (4) and the valve body (1).
  5. 5. A butterfly valve with high reverse tightness according to claim 1, characterized in that the first bushing (4), the valve stem (3) and the second bushing (5) are made of forged stainless steel.
  6. 6. A butterfly valve with high reverse tightness according to claim 1, characterized in that the bearing (6) is a deep groove ball bearing.
  7. 7. The butterfly valve with high reverse sealing performance according to claim 1, wherein the valve rod (3) is sequentially sleeved with the second bushing (5), the radial packing (15), the pressing sleeve (16) and the pressing block (17), the pressing block (17) is positioned in the bracket (11), the bolt (18) penetrates through the pressing block (17) and the bracket (11) and then is screwed into the valve body (1), and the valve body (1), the second bushing (5) and the radial packing (15) are sequentially abutted against the pressing sleeve (16) and the pressing block (17).
  8. 8. The butterfly valve with high reverse sealing performance according to claim 1, wherein a bearing groove is arranged in the bracket (11), the bearing (6) is positioned in the bearing groove, a bearing pressing plate (19) is arranged on the side surface of the bearing groove through bolts, and the bearing groove and the bearing pressing plate (19) are propped against two sides of the outer ring of the bearing (6).

Description

Butterfly valve with high reverse sealing performance Technical Field The utility model belongs to the technical field of valves, and relates to a butterfly valve with high reverse sealing performance. Background Butterfly valves have been developed rapidly in recent years in the valve industry due to their convenience and rapidness in opening and closing, labor saving, small fluid resistance, convenience in installation, and the like. The butterfly valve has a very wide application range, can be used for controlling the flow of various fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal and the like, and mainly plays roles of cutting off and throttling on a pipeline. With the application of high-temperature-resistant, low-temperature-resistant, strong corrosion-resistant, strong erosion-resistant and high-strength alloy materials in butterfly valves, the butterfly valves are widely applied in the industrial fields of high and low temperature, strong erosion, long service life and the like. The existing three-eccentric metal sealing butterfly valve is generally good in sealing performance in forward circulation, but poor in sealing performance in reverse high pressure, and difficult to meet the leakage grade requirement. Disclosure of Invention The utility model aims to provide a butterfly valve with high reverse sealing performance, which can solve the problems and reduce torque loss caused by deformation of a valve rod. According to the technical scheme, the butterfly valve with high reverse sealing performance comprises a valve body, a medium hole is formed in the middle of the valve body, valve body holes are formed in two sides of the medium hole, a support hole is formed in the support, a valve rod is rotatably arranged in the medium hole, the valve body hole and the support hole, a gasket sleeve, a first bushing, a valve plate, a second bushing and a bearing are sequentially sleeved on the valve rod, the first bushing and the second bushing are respectively positioned in the valve body holes on two sides, the bearing is positioned in the support hole, the valve plate is positioned in the medium hole, a pressing ring is arranged on the outer side of the valve plate, a sealing ring is arranged between the valve plate and the pressing ring in a pressing mode, a sealing boss matched with the sealing ring is arranged in the valve body, inner packing is arranged between the first bushing, the second bushing and the valve rod, and outer packing is arranged between the first bushing and the valve body. As a further improvement of the utility model, the valve rod is fixedly connected with the valve plate through a pin. As a further improvement of the utility model, a clamping plate is arranged at the end part of the valve rod, and the clamping plate, the cushion sleeve, the first bushing and the valve plate are axially abutted. As a further improvement of the utility model, the inner circumferences of the first bushing and the second bushing are provided with first packing grooves, and the outer packing is positioned between the first bushing and the valve body. As a further improvement of the utility model, the first bushing, the valve rod and the second bushing are made of forging stainless steel. As a further development of the utility model, the bearing is a deep groove ball bearing. The valve rod is sleeved with a second bushing, radial packing, a pressing sleeve and a pressing block in sequence, the pressing block is positioned in the support, a bolt penetrates through the pressing block and the support and then is screwed into the valve body, and the valve body, the second bushing and the radial packing are abutted against each other in sequence. As a further improvement of the utility model, a bearing groove is arranged in the bracket, the bearing is positioned in the bearing groove, the side surface of the bearing groove is provided with a bearing pressing plate through a bolt, and the bearing groove and the bearing pressing plate are propped against the two sides of the bearing outer ring. The application has the positive progress effects that: ① The bushing adopts an extension type design, so that the direct contact area of a medium and a valve rod is reduced, the deformation of the valve rod is reduced, and the fitting of a sealing surface is ensured. ② The utility model reduces the deformation of the valve rod after the valve rod is subjected to the medium force through the filler, realizes the sealing and reduces the torque. ③ According to the utility model, through the deep groove ball bearing, the stress point of the valve rod is increased, and the torque loss generated by the deformation of the valve rod is reduced. ④ The bushing and the valve rod are made of forge piece stainless steel, so that the rigidity is enhanced, the deformation of the bushing and the valve rod after being subjected to medium force is reduced, the sealing surface is attached,