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Intake Relief Valve Operation and Maintenance Illustrations Figures: 1 CZ Series Centrifugal Operation and Maintenance IntakeFire Relief Pumps Valve FormForm No. No. SectionSection IssueIssue Date Date Rev.Rev. Date Date Operation and Maintenance F-1031F-1031 21112314 08/20/9604/90 07/29/0309/08/11 Instructions Table of Contents Safety Information. 1 Introduction. 2 Operating Instructions . 5 After Pumping. 5 Maintenance Instructions . 6 1543 Intake Relief Valve Operation and Maintenance Illustrations Figures: 1. Pressure Control System . 2 2. Intake Relief Valve Operation Showing Pump Intake Pressure Below Pilot Valve Setting. 3 3. Intake Relief Valve Operation Showing Pump Intake Pressure Above Pilot Valve Setting. 4 4. Relief Valve Panel Plate and Calibration Dial. 5 5. Relief Valve Outlet Warning Plate. 5 6. Pilot Valve Maintenance. 6 All content in this instruction is property of the WaterousRead Company. through theInstructions safety informationsubject to change and without operating instructions carefully before using your Waterous Fire Pump. Visit us at www.waterousco.com Waterous Company 125 Hardman Avenue South, South St. Paul, Minnesota 55075 USA (651) 450-5000 Instructions subject to change without notice. Safety Information Read through the safety information and operating instructions carefully before using your Waterous Intake Relief Valve. ! WARNING ! DANGER Death or serious personal injury might occur if proper Intake Pressure Relief Outlet Hazard. Will result in operating procedures are not followed. The pump op‐ serious injury or death. erator, as well as individuals connecting supply or dis‐ Do not cap the intake pressure relief outlet. charge hoses to the apparatus must be familiar with A hose is connected to this outlet must be secure to these pump operating instructions as well as other prevent violent movement of the hose during pump operating instructions and manuals for the apparatus, operation. Position the hose to aim away apparatus water hydraulics and component limitation. and people. ! WARNING Do not cap the outlet of the relief valve. This system is designed to hold vacuum while priming and operating from draft. F-1031, Section 2314 Page 1 of 6 Introduction Figure 1. Pressure Control System Pilot Valve Dump to Atmosphere Intake Fitting Main Valve Check Valve Arrow away from pilot valve IL1543 Dump to Atmosphere Street Tee, 1/4 in. to separate drain valve The Waterous Intake Relief Valve system is designed The Waterous Intake Relief Valve system incorpo‐ to act as a safety valve by ``dumping'' excess pres‐ rates two separate units for flexibility in installation sure from the inlet side of the pump. This makes it and operation: the pilot valve and the main valve. less likely that ``water hammer'' will burst the supply The pilot valve controls operation of the main valve line, and allows the discharge relief valve or governor and can be panel mounted to be easily field adjusted system to properly control discharge pressure. for varying operating conditions (between 50 and 250 psi), or compartment mounted and preset for a spe‐ cific pressure. It includes a removable strainer and removable needle valve for easy servicing. F-1031, Section 2314 Page 2 of 6 Figure 2. Intake Relief Valve Operation Showing Pump Intake Pressure Below Pilot Valve Setting Pressure Adjusting Spring Adjustment Space B Knob Space A Control Piston 4 - 4 3 - 3 Piston 1 - 1 Pump Strainer Intake 2 - 2 Check Valve Location Throttle Screw (Fixed Clearance Needle Valve) Pilot Valve IL1544 Main Valve The preset value is set from 50-250 psi by adjusting If the intake pressure is below the preset value, the the pressure control knob. Turning the control knob pressure adjusting spring will hold the control piston changes the load on the pressure adjusting spring against its seat, equalizing the pressure on both sides which pushes the control piston onto its seat. The of the main valve piston. Because the surface area is water pressure in the pipe system acts through line larger on the back side of the main valve piston the 1-1 and through the strainer up to space A, between force applied is also greater, and together with the diaphragm and the control bushing. Space B, behind force of the spring, holds the main valve closed. the piston of the main valve, is controlled under pres‐ sure by the throttle screw and line 2-2. This pressure then continues via line 3-3 to the seat of the control valve. F-1031, Section 2314 Page 3 of 6 Figure 3. Intake Relief Valve Operation Showing Pump Intake Pressure Above Pilot Valve Setting Adjustment Pressure Adjusting Spring Space A Knob Space B Control Piston 4-4 Dump to Atmosphere 3-3 Piston Pump 1-1 Intake Strainer 2-2 Throttle Screw Check Valve (Fixed Pilot Valve Clearance Needle Valve) IL1545 Dump to Atmosphere Main Valve If the water pressure rises above the preset value, Since the amount of water which can enter space B the pressure acting on the diaphragm will overcome from the piping system is limited by the throttle the force of the spring. At that point the control pis‐ screw, the control valve opening results in a pres‐ ton lifts off its seat and the control valve is open. sure drop in space B. When the pressure in space B With the control valve open, the water can escape drops, the main valve piston is lifted off its seat by via line 3-3 from the pressure space B behind the the higher line pressure and the main valve is piston of the main valve, into line 4-4 and then to opened. the atmosphere. F-1031, Section 2314 Page 4 of 6 Operating Instructions Set operating pressure by aligning the desired setting on After Pumping the calibration dial with the arrow on the top of the panel plate. A spanner wrench may be used to move the cali‐ If pumping anything but clean water, open the intake relief bration dial. valve drain and flush entire system with clean, fresh water for several minutes to remove all traces of impurities. ! WARNING CAUTION Do not cap the outlet of the relief valve. This system is If the intake relief valve is exposed to freezing temper‐ designed to hold vacuum while priming and operating atures, drain all water from the system. Failure to from draft. close drain will cause intake relief valve to dump con‐ tinuously while pump is operating. ! DANGER Intake Pressure Relief Outlet Hazard. Will result in serious injury or death. Do not cap the intake pressure relief outlet. A hose is connected to this outlet must be secure to prevent violent movement of the hose during pump operation. Position the hose to aim away apparatus and people. A warning plate must be located near intake relief valve outlet. NOTE: The pilot valve ``dump'' will discharge water when in‐ take pressure exceeds the set pressure. Figure 4. Relief Valve Panel Plate and Calibration Dial Figure 5. Relief Valve Outlet Warning Plate IL1546 IL1547 NOTE: Do not use chlorine cleaning solvents on this plate. F-1031, Section 2314 Page 5 of 6 Maintenance Instructions 1. Clean the pilot valve strainer once per month, or as 4. Perform pump dry vacuum test each month. needed. Remove the screen using a 24 mm wrench. a) Close discharge and drain valves and similar Clean and reinstall. openings. 2. Clean the throttle screw once per month by removing b) Operate priming device to create a vacuum of it from the pilot valve. If the bore is plugged, it can be about 22 in. Hg in pump, then stop primer and flushed out with water. engine. 3. Test the intake relief valve system once a month with c) Watch pressure gauge. If vacuum drops more a pressurized water source capable of supplying con‐ than 10 in. Hg in 5 minutes, listen for air leaks at tinuous flow at 60 to 100 psi. the main valve outlet and pilot valve drain port a) Set the pilot valve slightly above the source pres‐ and drain nipples. sure and apply this pressure to the pump intake. Relief valve should remain closed. b) Reduce pilot valve setting to slightly below source pressure. Relief valve should open, ``dumping'' a large volume of water. c) Reset pilot valve above source pressure. Relief valve should close. Figure 6. Pilot Valve Maintenance F-1031, Section 2314 Page 6 of 6.
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