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TVN V504 Pressure Sustaining & Pressure Reducing Control Valve regulates inlet and outlet pressure in downward-sloping systems. It regulates overflow and high pressure in downward-sloping systems and enables the system to run in normal values. The valve fixes outlet pres¬sure without being affected by surge pressure.
If the value of manometer is below demanded pressure after giving water into the system, inlet pressure is made to increase by rotating adjustment bolt clockwise. If the value of manometer is above demanded pressure, the pressure rate is adjusted by adjusting the bolt counterclockwise. After this process, by screwing the luck nut under adjusting bolt, the bolt is being fixed.