The function of the muffler check valve of Shanghai gate valve manufacturer is to only allow the medium to flow in one direction, and prevent the flow of the direction. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow. Not suitable for medium containing solid particles and high viscosity.
Muffling check valve principle and structure description:
During the use of this valve, the medium flows in the direction of the arrow shown in the figure.
1. When the medium flows in the specified direction, the valve flap is opened by the force of the medium; when the medium flows backward, the sealing surface of the valve flap and the valve seat is sealed due to the weight of the valve flap and the opposing force of the medium. Close together to achieve the purpose of preventing the medium from flowing backward.
2. The sealing surface of the valve body and the valve clack adopts stainless steel surfacing welding.
3. The structural length of this valve is in accordance with GB12221-1989, and the flange connection size is in accordance with JB/T79-1994.
Internal thread check valve, butterfly check valve belong to this type of valve, which includes swing check valve and lift check valve. The swing check valve has a hinge mechanism and a valve flap like a door that rests freely on the inclined valve seat surface. In order to ensure that the valve clack can reach the proper position of the valve seat surface every time, the valve clack is designed in a hinge mechanism so that the valve clack has enough space for rotation and makes the valve clack truly and comprehensively contact the valve seat. The valve disc can be made of metal, or inlaid with leather, rubber, or synthetic covering, depending on the performance requirements. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve disc of the lift check valve is seated on the sealing surface of the valve seat on the valve body. Except that the disc can be raised and lowered freely, the rest of the valve is like a shut-off valve. The fluid pressure lifts the disc from the seat sealing surface, and the backflow of the medium causes the disc to fall onto the seat and cut off the flow. According to the conditions of use, the valve disc can be an all-metal structure, or it can be in the form of a rubber pad or a rubber ring inlaid on the disc holder. Like a stop valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow of the swing check valve is restricted Rarely. This type of valve should generally be installed horizontally in the pipeline.
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