High-performance double-eccentric elastic metal sealing butterfly valve

Abstract

The high-performance double-eccentric elastic metal sealing butterfly valve comprises a valve body, a butterfly plate and a valve rod, a valve cavity is formed in the valve body, the butterfly plate is located in the valve cavity, the butterfly plate is arranged in the valve cavity, a fixing pipe is arranged on the rear end face of the butterfly plate, a rotating groove is formed in the position, located under the fixing pipe, of the valve cavity, and the valve rod is arranged in the rotating groove. The lower end of the valve rod sequentially penetrates through the top of the valve body and the fixing pipe and then extends into the rotating groove, a first stepped annular table portion and a second stepped annular table portion are sequentially arranged on the end face of the front side face of the valve body, an elastic sealing valve seat is arranged on the second annular table portion, a valve body insert is arranged on the first annular table portion, and a valve rod is arranged on the valve body insert. The valve body insert is located on the outer side of the elastic sealing valve seat. According to the high-performance double-eccentric elastic metal sealing butterfly valve, the problems that in the using process of an existing butterfly valve, due to the fact that a pressing ring moves, the sealing performance of the whole butterfly valve is poor, and the service life is short are solved.

Description

Technical Field

[0001] The utility model specifically relates to a high-performance double-eccentric elastic metal sealing butterfly valve. Background Art

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for the on-off control of low-pressure pipeline media. A butterfly valve is a valve whose closing part is a disc that rotates around the valve shaft to achieve opening and closing. The valve plate can be driven by the valve stem. If it rotates ninety degrees, it can complete one opening and closing. By changing the deflection angle of the valve plate, the flow of the medium can be controlled. The valve plate and valve body of an existing butterfly valve are often connected by two components: a valve seat and a pressure ring. The pressure ring is made of rubber and bonded to the outer surface of the valve seat. During use, the pressure ring is easy to move, resulting in poor sealing of the entire butterfly valve, which shortens the service life of the butterfly valve. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a high-performance double-eccentric elastic metal sealing butterfly valve.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-performance double-eccentric elastic metal sealing butterfly valve, including a valve body, a disc plate and a valve stem, the valve body is provided with a valve cavity, the disc plate is located in the valve cavity, the valve cavity is provided with a disc plate, the rear end face of the disc plate is provided with a fixed tube, the valve cavity is provided with a rotation groove directly below the fixed tube, the lower end of the valve stem passes through the top of the valve body and the fixed tube in sequence and extends into the rotation groove, the front side end face of the valve body is sequentially provided with a stepped first ring platform portion and a second ring platform portion, the second ring platform portion is provided with an elastic sealing valve seat, the first ring platform portion is provided with a valve body insert, and the valve body insert is located on the outside of the elastic sealing valve seat.

[0005] Preferably, a mounting seat is provided on the top of the valve body, a limiting block is sleeved on the valve stem, and the limiting block is detachably mounted on the mounting seat.

[0006] Preferably, a packing cavity is formed between the mounting seat and the valve body, and the packing cavity is filled with sealing packing.

[0007] Preferably, the sealing filler is one of a polytetrafluoroethylene V-ring filler or a graphite asbestos filler.

[0008] Preferably, the valve body is sleeved with a first bearing and a second bearing, the first bearing is located between the packing cavity and the disc plate, and the second bearing is located in the rotating groove.

[0009] Preferably, the first bearing and the second bearing are both stainless steel bearings, and RPTFE linings are provided on the inner and outer surfaces of the stainless steel bearings.

[0010] Preferably, a first thrust washer is provided at the bottom of the first bearing, and a second thrust washer is provided at the top of the second bearing.

[0011] Preferably, flat portions are symmetrically provided on both sides of the upper end portion of the valve stem.

[0012] Preferably, the elastic sealing valve seat is a double-eccentric elastic metal sealing valve seat.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the high-performance double-eccentric elastic metal sealing butterfly valve improves the problem of poor sealing and short service life of the entire butterfly valve due to the movement of the pressure ring during use by arranging a stepped first ring land portion and a second ring land portion on the valve body, and respectively arranging a valve body insert and an elastic sealing valve seat on the first ring land portion and the second ring land portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0015] Markings in the figure: 1. valve body; 2. disc plate; 3. valve stem; 4. fixed pipe; 5. rotating groove; 6. first ring platform; 7. second ring platform; 8. elastic sealing valve seat; 9. valve body insert; 10. mounting seat; 11. limit block; 12. sealing packing; 13. first bearing; 14. second bearing; 15. first thrust washer; 16. second thrust washer; 17. flat part. DETAILED DESCRIPTION

[0016] In order to make the above features and advantages of the present invention more obvious and understandable, embodiments are given below with reference to the accompanying drawings for detailed description as follows.

[0017] like Figure 1 As shown, a high-performance double-eccentric elastic metal sealing butterfly valve comprises a valve body 1, a disc plate 2 and a valve stem 3. A valve cavity is arranged in the valve body 1, the disc plate 2 is located in the valve cavity, a disc plate 2 is arranged in the valve cavity, a fixing tube 4 is arranged on the rear end face of the disc plate 2, a rotation groove 5 is arranged at the valve cavity directly below the fixing tube 4, the lower end of the valve stem 3 passes through the top of the valve body 1 and the fixing tube 4 in sequence and then extends into the rotation groove 5, the valve stem 3 and the fixing tube 4 are locked and fixed by embedded screws, a stepped first ring platform portion 6 and a second ring platform portion 7 are arranged in sequence on the front side end face of the valve body 1, an elastic sealing valve seat 8 is arranged on the second ring platform portion 7, a valve body insert 9 is arranged on the first ring platform portion 6, a mounting hole is opened on the valve body insert 9, the valve body insert 9 is mounted on the first ring platform portion 6 through a pin shaft, the elastic sealing valve seat 8 is located between the valve body insert 9 and the second ring platform portion 7, and the valve body insert 9 is located on the outside of the elastic sealing valve seat 8.

[0018] In this embodiment, a mounting seat 10 is disposed on the top of the valve body 1 , and a limiting block 11 is sleeved on the valve stem 3 . The limiting block 11 is detachably mounted on the mounting seat 10 .

[0019] In this embodiment, a packing cavity is formed between the mounting seat 10 and the valve body 1 , and the packing cavity is filled with a sealing packing 12 .

[0020] In this embodiment, the sealing filler 12 is a polytetrafluoroethylene V-ring filler or a graphite asbestos filler.

[0021] In this embodiment, a first bearing 13 and a second bearing 14 are sleeved on the valve body 1 . The first bearing 13 is located between the packing cavity and the disc plate 2 , and the second bearing 14 is located in the rotating groove 5 .

[0022] In this embodiment, the first bearing 13 and the second bearing 14 are both stainless steel bearings, and RPTFE linings are provided on the inner and outer surfaces of the stainless steel bearings.

[0023] In this embodiment, a first thrust washer 15 is disposed at the bottom of the first bearing 13 , and a second thrust washer 16 is disposed at the top of the second bearing 14 .

[0024] In this embodiment, flat portions 17 are symmetrically provided on both sides of the upper end portion of the valve stem 3 .

[0025] In this embodiment, the elastic sealing valve seat 8 is a double-eccentric elastic metal sealing valve seat.

[0026] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equalization change and modification made to the above embodiment by any technician familiar with the field without departing from the content of the technical solution of the present invention based on the technical essence of the present invention shall fall within the scope of the present invention.

Claims

1. A high-performance double-eccentric elastic metal sealing butterfly valve, characterized by: The utility model comprises a valve body, a disc plate and a valve stem, wherein a valve cavity is arranged in the valve body, the disc plate is located in the valve cavity, a disc plate is arranged in the valve cavity, a fixing tube is arranged on the rear end face of the disc plate, a rotation groove is arranged in the valve cavity directly below the fixing tube, the lower end of the valve stem passes through the top of the valve body and the fixing tube in sequence and extends into the rotation groove, a stepped first annular portion and a second annular portion are arranged in sequence on the front side face of the valve body, an elastic sealing valve seat is arranged on the second annular portion, a valve body insert is arranged on the first annular portion, and the valve body insert is located on the outside of the elastic sealing valve seat.

2. The high performance double eccentric elastic metal sealing butterfly valve according to claim 1 is characterized in that: A mounting seat is arranged on the top of the valve body, a limiting block is sleeved on the valve stem, and the limiting block is detachably mounted on the mounting seat.

3. The high performance double eccentric elastic metal sealing butterfly valve according to claim 2 is characterized in that: A packing cavity is formed between the mounting seat and the valve body, and the packing cavity is filled with sealing packing.

4. The high performance double eccentric elastic metal sealing butterfly valve according to claim 3 is characterized in that: The sealing filler is one of a polytetrafluoroethylene V-ring filler or a graphite asbestos filler.

5. The high performance double eccentric elastic metal sealing butterfly valve according to claim 3 is characterized in that: The valve body is sleeved with a first bearing and a second bearing, the first bearing is located between the packing cavity and the disc plate, and the second bearing is located in the rotating groove.

6. The high performance double eccentric elastic metal sealing butterfly valve according to claim 5 is characterized in that: The first bearing and the second bearing are both stainless steel bearings, and RPTFE linings are provided on the inner and outer surfaces of the stainless steel bearings.

7. The high performance double eccentric elastic metal sealing butterfly valve according to claim 5, characterized in that: A first thrust washer is disposed at the bottom of the first bearing, and a second thrust washer is disposed at the top of the second bearing.

8. The high performance double eccentric elastic metal sealing butterfly valve according to claim 1 is characterized in that: Flat portions are symmetrically arranged on both sides of the upper end portion of the valve stem.

9. The high performance double eccentric elastic metal sealing butterfly valve according to claim 1, characterized in that: The elastic sealing valve seat is a double-eccentric elastic metal sealing valve seat.

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