sealing metal butterfly valve
Sealing Metal Butterfly Valve
The sealing metal butterfly valve utilizes the liquidity of the silicone when it is uncured, and has excellent oil resistance after curing. The metal sealing butterfly valve can be exposed between the end of the valve piece and the rotating shaft of the sealing head, and the shaft head and the valve body are exposed. Adjust the seal between them for permanent sealing. This method not only solves the seal between the valve plate and the rotating shaft here, but also forms a silicone film between the rotating shaft and the valve body due to the good fluidity of the silicone, and the sealing between the rotating shaft and the valve body is also obtained. strengthen.
The sealing metal butterfly valve drills a small hole at one end of the rotating shaft, communicates with the dovetail sealing groove that needs to be sealed, and the liquid silicone of the sealing material is injected through the hole to the portion to be sealed, and then pressed with a screw to make the silicone enter Go to the area to be sealed and cure.
The existing metal sealing butterfly valve mainly comprises a valve body, a valve plate, a rotating shaft and a sealing connecting member, and the sealing between the shaft head and the valve body, the end portion of the valve piece and the rotating shaft are required to be sealed. The joint of the traditional metal sealing butterfly valve valve plate away from the end of the exposed shaft head and the rotating shaft is generally sealed by a dovetail sealing block made of rubber, and the end of the valve piece close to the exposed shaft head is engaged with the rotating shaft, and is made of raw rubber. Sealing, the raw rubber seal is formed by the artificial plug to form the sealing block. The sealing block is not easy to be compacted, and the assembly is difficult. It is easy to cause permanent deformation after being pressed. It is easy to be unsealed due to shrinkage for a long time, and is soaked in oil for a long time. The raw rubber seals in the middle will be aging, and the butterfly valve seal will be affected. Therefore, it is difficult to seal the joint of the valve piece near the end of the shaft head and the joint of the rotating shaft.
Figure 1 is a schematic view of the structure of a metal sealing butterfly valve.
In the figure, 1 is a screw, 2 is a small hole, 3 is a rotating shaft, 4 is a silicone, 5 is a dovetail sealing groove, 6 is a valve body, 7 is a valve piece, and 8 is a dovetail sealing block.
The sealing method of the metal butterfly valve is to open a small hole 2 at the exposed end of the rotating shaft 3 of the metal butterfly valve mainly composed of the valve body 6, the valve plate 7, the rotating shaft 3 and the sealing member, and communicate with the dovetail sealing groove 5 which needs to be sealed, The sealing material liquid silicone 4 is injected from the hole into the dovetail seal groove 5 to be sealed by pressure, and then pressed downward from the exposed hole by the screw 1, so that the silicone 4 is densely packed. A silicone film is also formed between the rotating shaft 3 and the valve body 6. The end of the valve piece 7 away from the exposed shaft head is joined to the rotating shaft, and is still sealed by a dovetail sealing block 8 made of rubber.
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