Application : A valve through which the fluid passes in one direction and backflow of fluid is avoided. The valve acts only under the pressure of fluid having no controller device on outer body. Fluid circulation is controlled by a disc which gets away from valve body when fluid pressures and returned to its previous position when pressure stops. Places to be installed : Urban water supply Thermal installations of buildings Industrial purposes Pumps Petroleum and oil networks Warranty : 5 Years National Standard : PN25