Backflow preventer HS41X-16P/QC factory direct sales Shanghai Gaoqiao Valve

(The backflow preventer is a safety device used to prevent backflow contamination of domestic water pipes. It is a new backflow preventer developed by our company on the basis of Type and B types to prevent backflow contamination of water supply pipelines. It has small size, light weight, opening pressure Low water head loss and other good technical properties. This product patent number
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This product consists of a main valve and a drainer. The upper and lower cavities of the drainer are connected to the main valve through an external pipe. The front and rear ends of the valve are connected. Inside the main valve are two pistons that move synchronously. The valve stem is connected in the middle to open or close the two pistons synchronously. The diaphragm in the drainer is fixedly connected to the valve core on the drain port. The valve is connected through the external pipe diaphragm. The induction of front and rear pressure changes is transmitted to the valve core to control the switch of the drain.
During normal water supply, water flows into the push piston from the inlet end of the main valve body, and drives the secondary piston to open through the valve stem, and the water flows through the valve normally. , at this time, the inlet pressure is higher than the outlet pressure by about ., the pressure at the front and rear ends of the valve is transmitted to the diaphragm through the external pipe, and the drainer is closed without draining water. When the pressure difference between the front and rear of the valve decreases, the main valve piston closes in balance under the action of the return spring , until the pressure difference between the front and rear reduces to approximately In the closed state, the force on the drain diaphragm changes at this time, and the valve core opens to drain water until the water in the middle cavity formed by the two pistons in the main valve is drained out, and the air enters the middle cavity to form an air barrier. For example, the two pistons If the seal fails, the leaking water can also be discharged through the middle cavity to prevent backflow contamination