factory low price ball valve fittings - 3000PSI WCB THREADED CHECK VALVE – BESTFLOW

Parameter

1.In strict accordance with the standard of GB, JB, JIS, ANSI, KS, BS, DIN, API and etc.
2.Certification: ISO9001, BSCI, CE, ROHS, FCC, FDA etc

The function of this type of valve is to allow the medium to flow in only one direction and prevent the flow in one direction. Usually, this valve works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self weight of the valve disc act on the valve seat, so as to cut off the flow.
The internal thread check valve and butterfly check valve belong to this type of valve, including swing check valve and lift check valve. The swing check valve has a hinge mechanism, and a valve disc like a door freely rests on the inclined seat surface. In order to ensure that the valve clack can reach the appropriate position of the valve seat surface every time, the valve clack is designed in the hinge mechanism, so that the valve clack has enough swing space and makes the valve clack really and comprehensively contact with the valve seat. The valve disc can be made of metal, or inlaid with leather, rubber or synthetic coverage, depending on the requirements of service performance. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the valve disc can rise and fall freely, the rest of the valve is like a stop valve. The fluid pressure lifts the valve disc from the sealing surface of the valve seat, and the medium backflow causes the valve disc to fall back to the valve seat and cut off the flow. According to the service conditions, the valve disc can be of all metal structure or inlaid with rubber pad or rubber ring on the valve disc frame. Like the 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 rarely limited

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