Installation Guide for WATTS models including: W-M115-EN-202005, W-M115-EN-202005 Pressure Reducing Valve, Pressure Reducing Valve, Reducing Valve, Valve
Jun 4, 2022 — The main valve is controlled by the action of the pressure reducing pilot valve. If the downstream pressure is below the set pressure then the pilot.
W-M115-EN-202005 ACV: Pressure Reducing Valve Specification & Installation Series W-M115 ACV: Pressure Reducing Valve Size: DN32 - DN200 The Watts W-M115 Non-Watermarked Pressure Reducing Valve is designed to automatically reduce a fluctuating or high inlet pressure to a stable lower outlet pressure. The outlet pressure is adjustable over a broad range and remains stable from maximum to minimum rated flows. Features · Stainless steel trim as standard, for greater reliability & service life · Dual pressure gauges as standard, for ease of setting and confidence in performance · Factory tested and downstream pressure preset to 500 kPa as standard Pressure - Temperature · Operating Pressure: up to 1600kPa Standard, higher pressures on request · Working Temperature: 0-80¥ for NBR Diaphragm & Seals · Set Pressure Range: Standard: 70 to 860 kPa(set at 500 kPa) Optional: 140 to 120 kPa(set at 500 kPa) Test Pressures · Body Test Pressure: 2400 kPa · Seat Test Pressure: 1760 kPa · Based on Table E Flange Material Component Body/bonnet Stem/seat Diaphragm Main valve seal Pressure reducing pilot Pilot strainer, needle valve & fittings Pilot tubing Material Ductile Iron with Epoxy Resin, NSF Certified Coating Stainless Steel Nylon Reinforced NBR NBR Brass Brass Copper Specification · Connection Type: Flanged to AS 2129 Table E as Standard: DN65-DN200 Threaded BSPT: DN32- DN50 · Working Medium: Non corrosive liquids Operating Principle The main valve is controlled by the action of the pressure reducing pilot valve. If the downstream pressure is below the set pressure then the pilot valve opens, releasing water from the top chamber of the main valve, causing the main valve to open and downstream pressure to rise. As the downstream pressure nears the set point the pilot valve begins to close a little, resulting in more water accumulating in the top chamber of main valve, causing main valve to modulate and maintain the downstream 3 pressure. If the downstream pressure increases above the set point, the pilot valve closes completely, resulting in full line pressure gently closing the main valve and creating a drip tight seal. In this way the main valve responds precisely to accurately maintain the downstream pressure. 4 2 1 FLOW CLOSES VALVE OPENS VALVE 1 - Main Valve 2 - Pressure Reducing Control 3 - Fixed Orifice 4 - Flo-Clean Strainer Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold. Page 1 / 3 Installation Dimensions Connection Dimension: Threaded and AS 2129 Table E W-M115-EN-202005 H H1 E T L B Size Dimensions(mm) DN L H H1 B C 32 BSPT 184 305 271 235 / 40 BSPT 184 305 271 235 / 50 BSPT 238 315 268 250 / 65 280 341 258 272 127 80 305 330 238 295 146 100 381 415 308 372 178 150 508 471 331 470 235 200 645 570 405 525 292 *Please contact the local salesmen if the size DN200 are needed. Flange Dimensions(mm) n-D E T / / / / / / / / / 4-18 165 22.4 4-18 185 23.9 8-18 215 23.9 8-22 280 25.4 8-22 335 28.4 Weight(Kg) 17.5 17.5 18.2 19.2 36.5 52.3 112 198 Flow Rates Size DN (mm) 32 40 50 65 80 100 200 Maximum Continuous (l/s) 6 8 13 19 31 50 111570 196 Maximum Intermittent (l/s) 8 10 17 25 37 63 145 252 Minimum Continuous (l/s) 0.2 0.3 0.4 0.6 0.9 1.0 1.1 1.6 General Application 150 120 180 90 210 60 30 240 psi 270 AVOID FREEZING 0 300 AVOID FREEZING 150 120 180 90 210 60 30 240 psi 270 AVOID FREEZING 0 300 AVOID FREEZING Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold. Page 2 / 3 Installation Instructions · Prior to installation, flush line to remove debris. · Install valve horizontally "in line" (cover facing UP), so flow arrow matches flow through the line. Avoid installing valves 6" and larger vertically. Consult factory prior to ordering if installation is other than described. · Install inlet and outlet isolation valves. NOTE: When using butterfly valves, insure disc does not contact control valve. Damage or improper valve seating may occur. · Provide adequate clearance for valve servicing and maintenance. · Install pressure gauges to monitor valve inlet and outlet pressure. · If installation is subjected to very low flow or potentially static conditions, it is recommended a pressure relief valve (1/2" minimum) be installed downstream of the Pressure Reducing Valve for additional system protection. Start-Up Proper Automatic Control Valve start-up requires bringing the valve into service in a controlled manner. All adjustments to control pilots and speed controls should be made slowly, allowing the valve to respond and the system to stabilize. NOTE: Control Valves should be set-up in a dynamic (flowing) condition for proper startup. Provisions for flow must be made to insure proper settings. 1. Close upstream and downstream valves to isolate the valve from line pressure. Release spring tension on Pressure Reducing Control by turning adjustment screw out (counterclockwise), decreasing setpoint. Open all Isolation Ball Valves, if so equipped. If valve is fitted with adjustable speed controls, turn needle(s) in (clockwise) until seated, and return out (counterclockwise) 1-1/2 to 2-1/2 turns. These are approximate settings, and should be fine tuned to suit system requirements after pressure adjustments have been made. 2. Slowly open upstream isolation valve to allow controlled filling of the valve. Vent entrapped air by carefully loosening control tubing or pipe plug at the highest point possible. If valve is equipped with a Position Indicator, open Air Bleed Petcock to vent air. Water will be milky in appearance and will begin to clear as air is vented. Carefully loosen enough cover screws on control pilot(s) to vent entrapped air. Re-tighten when water vents clearly. 3. Setting Reducing Control: Slowly open downstream isolation valve. Gradually turn adjustment screw on the Pressure Reducing Control in (clockwise) to raise downstream pressure. Allow valve and system to stabilize. Observe inlet and outlet pressure gauges. Continue to adjust as needed, pausing approximately every 1-1/2 turns, allowing valve and system to stabilize. Turning adjustment screw clockwise raises outlet pressure. Turning adjustment screw counterclockwise lowers outlet pressure. When desired downstream pressure is reached, tighten locknut on adjustment screw. 4. Fine tune Speed Controls to suit system requirements. Adjust Closing Speed Control (if equipped) clockwise for slower closure, and counterclockwise for faster closure. Adjust Opening Speed Control (if equipped) clockwise for slower opening, and counterclockwise for faster opening. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold. W-WA-M115-EN-201904 Page 3 / 3Adobe Illustrator CS6 (Windows) Adobe PDF library 10.01