Fireproof double eccentric butterfly valve

Abstract

The utility model discloses a fire -proof double eccentric butterfly valve, including main part assembly, valve stem, hard valve seat and soft valve seat, main part assembly is equipped with the medium channel of through, the valve stem rotatable connection is in main part assembly and is connected with the butterfly plate, the butterfly plate is located in medium channel and has annular cooperation surface, the diameter of annular cooperation surface decreases along the delivery direction of medium in medium channel, and hard valve seat and soft valve seat all are located in the export side of medium channel and all are annular structure, and hard valve seat is located in the one side of soft valve seat near the import side of medium channel and is in contact with soft valve seat, and the ring inboard of hard valve seat and soft valve seat can all be with annular cooperation surface and abuts, and the ring inboard of hard valve seat is equipped with first ring convex part, and first ring convex part extends and protrudes towards the import side of medium channel, and main part assembly corresponds and is equipped with first annular groove, and first ring convex part stretches into first annular groove and can be in contact with the ring inboard groove wall of first annular groove. The utility model can enhance the anti -deformation ability of hard valve seat, and ensure the sealing performance.

Claims

1. A fire safe double offset butterfly valve, characterized in that, include: The main component has a through-type medium channel. A valve stem is rotatably connected to the main body assembly. The valve stem is connected to a butterfly plate and can drive the butterfly plate to rotate. The butterfly plate is disposed in the medium channel and has an annular mating surface. The diameter of the annular mating surface decreases along the conveying direction of the medium in the medium channel. The system includes a rigid valve seat and a flexible valve seat, both connected to the main body assembly and located on the outlet side of the medium channel. Both the rigid and flexible valve seats are annular in shape. The rigid valve seat is located on the side of the flexible valve seat closer to the inlet side of the medium channel and contacts the flexible valve seat. The inner sides of both the rigid and flexible valve seats can abut against the annular mating surface. The inner side of the rigid valve seat has a first annular protrusion extending towards the inlet side of the medium channel. The main body assembly has a corresponding first annular groove, and the first annular protrusion extends into the first annular groove and can contact the inner wall of the first annular groove.

2. The fireproof double eccentric butterfly valve according to claim 1, characterized in that, The main component includes a valve body and an end cap. The end cap is connected to the valve body and located on the outlet side of the medium channel. The outer ring of the rigid valve seat is sandwiched between the valve body and the end cap. The flexible valve seat is sandwiched between the rigid valve seat and the end cap.

3. The fire safe double offset butterfly valve of claim 2, wherein, The end cap and / or the valve body are provided with a sealing groove on the outer side of the ring corresponding to the hard valve seat, and a graphite sealing ring is provided in the sealing groove to abut against the hard valve seat.

4. The fire safe double offset butterfly valve of claim 2, wherein, The soft valve seat has a second annular groove on the side facing the end cap, and the end cap has a second annular protrusion extending into the second annular groove. The hard valve seat and the second annular protrusion clamp the soft valve seat.

5. The fire safe double offset butterfly valve of claim 4, wherein, A gap is reserved between the inner side of the rigid valve seat and the valve body, and the second annular protrusion abuts against the soft valve seat, causing the inner side of the soft valve seat and the inner side of the rigid valve seat to tend to move towards the inlet side of the medium channel.

6. The fire safe double offset butterfly valve of claim 2, wherein, An auxiliary pressure chamber and a medium gap are provided between the flexible valve seat and the end cap. The medium gap can connect the outlet side of the medium channel with the auxiliary pressure chamber, so that the medium at the outlet side of the medium channel can enter the auxiliary pressure chamber through the medium gap. The inner side of the flexible valve seat can abut against the annular mating surface under the pressure of the medium in the auxiliary pressure chamber.

7. The fire safe double offset butterfly valve of claim 6, wherein, The end cap has a third annular groove on the side facing the soft valve seat. The soft valve seat has a third annular protrusion extending into the third annular groove. The medium gap is formed between the inner wall of the third annular protrusion and the inner wall of the third annular groove. The auxiliary pressure cavity is formed between the outer wall of the third annular protrusion and the outer wall of the third annular groove.

8. The fire safe double offset butterfly valve of claim 7, wherein, The diameter of the outer wall of the third ring protrusion decreases along the transport direction of the medium in the medium channel.

9. The fire safe double offset butterfly valve of claim 1, wherein, The main component is provided with an indexing plate, which has multiple snap-fit ​​notches. The multiple snap-fit ​​notches are evenly spaced around the rotation axis of the valve stem. The upper end of the valve stem is connected to a rotating handle, and a locking element is rotatably connected to the rotating handle. The locking element is connected to an elastic element, which acts on the locking element and enables the locking element to snap into the snap-fit ​​notch.

10. The fire safe double offset butterfly valve of claim 1, wherein, The medium channel is provided with a rotation limiting part corresponding to the butterfly plate, and the rotation limiting part is used to restrict the rotation direction of the butterfly plate.

Images