pressure reducing and sustaining control valve a Pressure Sustaining Pilot Valve b Ball Valves c In-line Finger Filter d Pressure Reducing Pilot Valve e Pressure Gauge f Adjustment Bolt Armaş “PRPS” model pressure reducing/sustaining hydraulic control valve reduces valve downstream pressure to desired value by sustaining upstream pressure. Two pilot valves exist on valve. Pilot valve on upstream side is the pressure sustaining pilot valve and sustains upstream pressure. Other pilot valve is pressure reducing pilot valve and keeps downstream pressure constant by reducing it to desired value. Reducing/sustaining control valve pumps fluid downwards; it ensures that system works within normal values by regulating over flow and high pressure in pumping systems. It controls upstream and downstream pressure continuously and keeps them within constant values. adjustment • Operate pump, open main valve on network and deliver water to system. • Open ball valves indicated with“b1”and close ball valve indicated with“b2” . • Adjust desired upstream pressure value by means of adjustment bolt indicated with “f1” on pressure sustaining pilot valve indicated with“a”by referring pressure gauge. Tighten contra nut after determining set point. • Adjust pressure reducing pilot valve indicated with“d”by means of adjustment bolt indicated with“f2”on it by referring pressure gauge. Pressure gauge indicated with“e2”on pressure reducing pilot valve will show valve downstream pressure value. • When you turn adjustment bolt of both pilot valves clockwise, downstream pressure value will increase and when you turn adjustment bolt counter-clockwise it will decrease. • After adjusting desired pressure set point on both pilot valves, open spherical valve indicated with “b2” and deliver water to system. During normal operation of valve, upstream pressure gauge will show valve upstream pressure value and downstream pressure gauge will show zero value. Close spherical valve indicated with“b2”to see downstream pressure value. typical application • Valve diameter may not be selected as equal to or in closest smaller size than main pipe diameter. • Mount valve in direction of arrow indicated on it. • It is recommended that insulation valves (butterfly or gate valves etc.), air relief valve and strainer valves will be used in linemounting of valve. • During pressure decrease, cavitation risk is dangerous for valve body. Adjust downstream pressure value by referring cavitation data or consult our technical service.

maintenance • System operating conditions that effect on the valve should be checked periodically to determent the required preventative maintenance schedule. • Check finger filter indicated with "c"according to water quality and clean it. Do not make cleaning more than one within a few months unless water is too dirty. • Drain water within actuator and pilot valves of valves not used in winter. • Check downstream pressure value continuously.