Valve arrangement for a pressurized water purifier

A pressurized water purifier, comprising:

• an inlet conduit including a pressure elevating pump;
• a filter or membrane-type purifying unit, said purifying unit being adapted for receiving pressurized water to be purified from said inlet conduit and for purifying said pressurized water;
• a purified water outlet conduit for supplying pressurized purified water from the purifying unit;
• and
• a reject conduit for supplying reject water from the purifying unit, said reject conduit including a pressure-limiting valve externally controlled by the pressure of the pressurized purified water in said purified water outlet conduit to increase the pressure in the water purifier and the purified water outlet conduit in response to a decreasing pressure to the purified water outlet conduit and to decrease the pressure in the water purifier and the purified water outlet conduit in response to an increasing pressure in the purified water outlet conduit;
• the pressure-limiting valve comprising a valve housing which includes a valve body which can be moved in a valve-opening direction by the pressures that prevail in the reject conduit and the purified water outlet conduit, against the action of a spring;
• said valve housing having an inlet from said reject conduit located effectively upstream of said valve body, and an outlet to said reject conduit located effectively downstream of said valve body.