check valve

A check valve is a one-way valve that can automatically prevent fluid backflow, also known as a one-way valve. Usually, fluid under pressure causes the valve disc of the valve to open and flow from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve disc automatically closes the channel under the action of fluid pressure and its own gravity, preventing fluid backflow from causing damage to the equipment in front of the valve. The valve body of lift check valves is often similar to that of globe valves, with high fluid resistance. These types of check valves are high-pressure small-diameter and often use spherical valve discs. Swing check valves have low resistance to fluids and are generally suitable for small and medium-sized, low-pressure, and large-diameter pipelines. The shape of butterfly check valve is similar to that of butterfly valve, with single and double lobes. It has a simple structure and low resistance to fluids. Pipelines that are prone to water hammer can use micro resistance slow closing check valves with buffering function to extend the closing time, slow down the speed caused by water hammer, and avoid damage to the valve front equipment caused by water hammer. Zhejiang Shanliu Valve Technology produces various types of rotary check valves, lift and drop check valves, double disc butterfly check valves, clamp check valves, ball check valves, axial flow check valves, inclined disc check valves, globe check valves, flange check valves, silent check valves, soundproof check valves, micro resistance slow closing check valves, etc.