Fireproof double-eccentric high-performance butterfly valve

Abstract

The fireproof double-eccentric high-performance 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 part and a second stepped annular table part are sequentially arranged on the end face of the front side face of the valve body, a fireproof sealing valve seat is arranged on the second annular table part, a valve body insert is arranged on the first annular table part, and a valve rod is arranged on the valve body insert. The valve body insert is located on the outer side of the fireproof sealing valve seat, a third annular table part is arranged on the end face of the rear side face of the valve body, and a fireproof metal ring is installed on the third annular table part. According to the fireproof double-eccentric high-performance butterfly valve, the problems that an existing butterfly valve is poor in fireproof performance and short in service life in the using process are solved.

Description

Technical Field

[0001] The utility model specifically relates to a fireproof double-eccentric high-performance 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 an 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 is bonded to the outer surface of the valve seat. During use, the pressure ring has poor fireproof performance and cannot effectively block the flames in the event of a fire, which easily leads to poor sealing of the entire butterfly valve and 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 fireproof double-eccentric high-performance butterfly valve.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a fire-proof double-eccentric high-performance butterfly valve, including a valve body, a disc plate and a valve stem, a valve body is provided with a valve cavity, the disc plate is located in the valve cavity, a disc plate is provided in the valve cavity, a fixed tube is provided on the rear end face of the disc plate, a rotation groove is provided at the valve cavity 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, a front side end face of the valve body is sequentially provided with a stepped first ring platform portion and a second ring platform portion, a fire-proof sealing valve seat is provided on the second ring platform portion, a valve body insert is provided on the first ring platform portion, the valve body insert is located on the outside of the fire-proof sealing valve seat, a third ring platform portion is provided on the rear side end face of the valve body, and a fire-proof metal ring is installed on the third ring platform portion.

[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 front end face and the rear end face of the fireproof sealing valve seat are respectively formed with annular grooves, and fireproof gaskets are respectively placed in the annular grooves.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the fireproof double eccentric high-performance butterfly valve has a stepped first ring platform and a second ring platform arranged on the valve body, and a valve body insert and a fireproof sealing valve seat are respectively arranged on the first ring platform and the second ring platform, and a fireproof metal ring is arranged on the rear side end face of the valve body, and the front and rear fireproof components effectively improve the problems of poor fire resistance and short service life of the existing butterfly valves during use. 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 tube; 5. rotating groove; 6. first ring platform; 7. second ring platform; 8. fireproof 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; 18. fireproof metal ring; 19. fireproof washer; 20. annular groove. 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 1As shown, a fireproof double eccentric high-performance 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, and the disc plate 2 is located in the valve cavity. The valve cavity is provided with a disc plate 2, and a fixed pipe 4 is arranged on the rear end face of the disc plate 2. A rotation groove 5 is arranged directly below the fixed pipe 4 in the valve cavity. The lower end of the valve stem 3 sequentially passes through the top of the valve body 1 and the fixed pipe 4 and then extends into the rotation groove 5. The valve stem 3 and the fixed pipe 4 are locked and fixed by embedded screws. The front side end face of the valve body 1 is sequentially provided with a stepped first ring platform portion 6 and a second annular platform portion 7, a fireproof sealing valve seat 8 is arranged on the second annular platform portion 7, a valve body insert 9 is arranged on the first annular platform portion 6, a mounting hole is opened on the valve body insert 9, the valve body insert 9 is installed on the first annular platform portion 6 through a pin shaft, the fireproof sealing valve seat 8 is located between the valve body insert 9 and the second annular platform portion 7, the valve body insert 9 is located on the outside of the fireproof sealing valve seat 8, the rear side end face of the valve body 1 is provided with a third annular platform portion, a fireproof metal ring 18 is installed on the third annular platform portion, and the inner diameter of the fireproof metal ring 18 is larger than the outer diameter of the disc plate 2.

[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, an annular groove 20 is formed on the front end surface and the rear end surface of the fireproof sealing valve seat 8, and a fireproof gasket 19 is placed in the annular groove 20.

[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 fireproof double eccentric high performance 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 front side end face of the valve body is sequentially provided with a stepped first ring platform portion and a second ring platform portion, a fireproof sealing valve seat is arranged on the second ring platform portion, a valve body insert is arranged on the first ring platform portion, the valve body insert is located on the outside of the fireproof sealing valve seat, a third ring platform portion is arranged on the rear side end face of the valve body, and a fireproof metal ring is installed on the third ring platform portion.

2. The fireproof double eccentric high performance butterfly valve according to claim 1 is characterized by: 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 fireproof double eccentric high performance 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 fireproof double eccentric high performance butterfly valve according to claim 3 is characterized by: The sealing filler is one of a polytetrafluoroethylene V-ring filler or a graphite asbestos filler.

5. The fireproof double eccentric high performance butterfly valve according to claim 3 is characterized by: 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 fireproof double eccentric high performance 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 fireproof double eccentric high performance butterfly valve according to claim 5 is 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 fireproof double eccentric high performance butterfly valve according to claim 1 is characterized by: Flat portions are symmetrically arranged on both sides of the upper end portion of the valve stem.

9. The fireproof double eccentric high performance butterfly valve according to claim 1, characterized in that: The front end face and the rear end face of the fireproof sealing valve seat are respectively formed with annular grooves, and fireproof gaskets are respectively placed in the annular grooves.

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