1.DRVZ silent check valve
Check Valve: A valve that automatically prevents the fluid from flowing backwards. The valve flap of the check valve opens under fluid pressure, and the fluid flows from the inlet side to the outlet side. When the inlet side pressure is lower than the outlet side, the valve flap automatically closes under the influence of fluid pressure difference, its own gravity and the like to prevent the fluid from flowing backward.
Check Valve: Generally divided into four types: lift type, swing type, butterfly type and horizontal type.
The structure of the lift check valve is generally similar to the stop valve. The valve flap moves up and down along the center line of the passage, and the action is reliable, but the fluid resistance is large, which is suitable for occasions with smaller caliber. Lift check valves are available in both straight and vertical versions. Straight-flow lift check valves are generally only installed in horizontal lines, while vertical lift check valves are generally installed in vertical lines.
The valve flap of the swing check valve rotates around the rotating shaft. Its fluid resistance is generally smaller than that of the lift check valve, which is suitable for larger diameter applications. According to the number of flaps, the swing check valves can be divided into three types: single flap swing type, double flap swing type and multi-lobed swing type. Single-lobed swing check valves are generally suitable for medium caliber applications. When a single-valve rotary check valve is used for the large-diameter pipe, in order to reduce the water hammer pressure, it is preferable to use a slow-closing check valve that can reduce the water hammer pressure. The double-valve swing check valve is suitable for large and medium diameter pipes. The double-valve swing check valve has a small structure and light weight, and is a fast-developing check valve; the multi-lobed swing check valve is suitable for large-diameter pipes.