Our Stop Silent check valves are equipped with a diaphragm that prevents the back flow of liquid and gaseous fluids. The valve closes silently and without water hammer. This anti-reflux device ensures the required tightness even in the presence of dirty or granular fluids such as sand for example. The valve also acts as a raw filter and protects your systems. In addition, they do not have any moving mechanical parts subject to wear, which guarantees a long service life.