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The non-return valve is a device functioning one-way, it allows to avoid the return of the fluid under pressure.
Find natural to use in systems for potable water, raising water, heating, in thermal power stations, heat generators (boilers, wood boilers, heat pumps), solar, waterworks, industrial and agricultural in general.
The hydraulic seal with the internal is effected by means of the forces exerted by a spring and by the pressure of the liquid above the gasket that makes the seal, even against the pressure minimum. In addition to this, the force of the spring allows the valve to possess a universal feature with regard to the installation position.