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What are the classifications of stainless steel check valves?Release Date: November 21, 2016
It is precisely because the check valve can only allow the medium to flow in one direction and can prevent the flow in the opposite direction, so it must be used in a suitable pipeline. However, because there are many specific classifications, it should not be too sloppy when selecting. Once used incorrectly, it will also cause a lot of confusion. What are the classifications of stainless steel check valves?
I. Swing check valve This type of valve has a hinge mechanism and a valve-like flap that rests freely on an inclined seat surface. In order to ensure that the valve disc can reach the appropriate position on the valve seat surface every time, the valve disc is designed in a hinge mechanism so that the valve disc has enough swing space and the valve disc is truly and comprehensively in contact with the valve seat. The discs can be made entirely of metal, or they can be inlaid with leather, rubber, or a synthetic covering, depending on the performance requirements. Swing check valve is fully open, the fluid pressure is almost unhindered, so the pressure drop across the valve is relatively small.
Second, the lift check valve is located on the valve seat on the valve seat sealing surface. Except that the valve disc can be lifted and lowered freely, the rest is like a stop valve. The fluid pressure causes the valve disc to lift from the sealing surface of the valve seat, and the backflow of the medium causes the valve disc to fall back to the valve seat and cut off the flow. Depending on the conditions of use, the disc can be an all-metal structure, or it can be in the form of a rubber pad or rubber ring inlaid on the disc frame. Like the shut-off valve, the passage of fluid through the lifting check valve is also narrow, so the pressure drop through the lifting check valve is larger than that of the swing check valve, and the flow of the swing check valve is limited Rarely.
Three, stainless steel flue check valve
1. The manufacturing principle is the same as that of the original plastic check valve. The whole is made of stainless steel or stainless iron and needs to be punched for installation. The advantage is that it has a one-way fire prevention effect and the smoke prevention effect is average.
2. The latest snap-in type new check valve is composed of stainless steel or stainless iron. The valve leaf type hinge type opening and closing has better sealing performance and simpler installation. The only disadvantage is that it is one-way fireproof. Can not meet the requirements of the State Fire Protection Administration.
I believe everyone is clear about the classification of stainless steel check valves . The valves used in each pipeline must have structural rationality and functional applicability, so as to avoid leakage or other potential safety hazards, and they must be installed, repaired or disassembled in strict accordance with the product instructions. Avoid blind operation.