Brass Swing Check Valve

Brass Swing Check Valve N10161005 is a kind of brass valve whose opening and closing parts are circular discs and rely on its own weight and medium pressure to generate actions to block the back flow of the medium. It is an automatic valve, also known as brass check valve, brass one-way valve, brass non-return valve, brass horizontal check valve or brass isolation valve. 

The movement of the disc is divided into lift type and swing type. The lift check valve is similar in structure to the stop valve, but lacks the valve stem that drives the disc. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the sum of the weight of the disc and its flow resistance, the valve is opened. On the contrary, the valve is closed when the medium flows back. The swing check valve has a disc that is inclined and can rotate around the axis, and its working principle is similar to that of the lift check valve. The check valve is often used as the bottom valve of the pumping device to prevent the backflow of water. The combination of check valve and stop valve can play a role of safety isolation. 

The brass swing check valve can also be used in the pipeline that supplies supplementary systems where the pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).

Brass swing check valve This type of valve's function is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Usually the brass swing check 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 Cut off the flow.

Among them, brass swing check valve belongs 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 disc 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 clack can be made of metal, or it can be 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 located 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 this 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 back 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 valve disc frame. Like a shut-off 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 rate of the swing check valve is restricted. rare.

1. Do not let the check valve bear weight in the piping system. Large check valves should be independently supported so that they are not affected by the pressure generated by the piping system.

2. When installing, pay attention to the direction of medium flow should be consistent with the direction of the arrow marked on the valve body.

3. Lifting vertical flap check valve should be installed on the vertical pipeline.

4. Lifting swing flap check valve should be installed on the swing pipeline.

The reason for the disc breaking is that the pressure of the medium before and after the check valve is close to equilibrium and they are "see-saw" each other. The disc often beats against the valve seat. The valve is made of some brittle materials (such as cast iron, brass, etc.) The flap was broken. The prevention method is to use a check valve whose disc is a flexible material.

The reasons for the backflow of the medium are: the sealing surface is damaged;  the impurity is trapped in.

Repairing the sealing surface and cleaning impurities can prevent backflow.

Our test laboratory equips with various devices for brass swing check valve quality inspect and control, as well as new product development, general tests include: