Pressure Reducing and Sustaining Valve IR-423 The BERMAD Model IR-423 Pressure Reducing and Sustaining Valve is a hydraulically operated, diaphragm actuated control valve with two independent functions. It sustains minimum preset upstream pressure regardless of fluctuating flow or varying downstream pressure, and it prevents downstream pressure from rising above maximum preset regardless of fluctuating flow or excessive upstream pressure. ■ Line Pressure Driven PRV and PSV □ Prioritizes higher pressure zones □ Protects lower pressure zones □ Controls system fill-up □ Prevents pipeline emptying □ Protects pump from overload and cavitation □ Compensates during groundwater drawdown ■ Advanced Globe Hydro-Efficient Design □ Unobstructed flow path □ Single moving part □ High flow capacity ■ Fully Supported & Balanced Diaphragm □ Requires low actuation pressure □ Excellent low flow regulation performance □ Progressively restrains valve closing □ Prevents diaphragm distortion ■ User Friendly Design □ Easy pressure setting □ Simple in-line inspection and service Typical Applications ■ Downhill Supply Lines □ Emptying Prevention □ Higher Pressure Zone Prioritizing □ Lower Pressure Zone Protection ■ Line Fill-Up Control ■ Pump Overload and Cavitation Protection ■ Deep Well Pump Drawdown Compensation [1] BERMAD Model IR-423 prioritizes higher pressure zone, protects lower pressure zone, controls system fill-up, and prevents line emptying. [2] BERMAD Relief Valve Model 73Q [3] BERMAD Strainer Model 70F

400 Series For full technical details, refer to Engineering Section. Pressure Reducing Technical Specifications Flow Chart Dimensions and Weights Size Technical Data Patterns and Sizes: Globe: 3-16”; DN80-400 Angle: 3-4”; DN80-100 End Connections: PressurePressure Ratings: 16 bar; 232 psi Operating Pressure Range: 0.5-16 bar; 7-232 psi For lower pressure requirements, consult factory Setting Range: 1.5-16 bar; 22-232 psi Setting ranges vary according to specific pilot spring. Please consult factory. Materials: Body and Cover: Polyester Coated Cast or (10”; DN250 and larger) Ductile Iron Spring:...