WATSON W91 Series Installation, Operation & Maintenance Instructions Manual Download Page 1 | Manualshive

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2440300 Rev A

Page 83

Series W91/94 Self-Operating Temperature Regulator

Installation, Operation & Maintenance Instructions

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Summary of Contents for W91 Series

Page 1: ...2440300 Rev A Page 83 Series W91 94 Self Operating Temperature Regulator Installation Operation Maintenance Instructions...

Page 2: ...n 6 Repairing Valve Body Assembly 7 Reversing the Valve Action 9 3 Way Regulator Installation Maintenance 10 Typical Applications 12 13 Heat Exchanger Application Using a Self Op 2 Way Valve Heat Exch...

Page 3: ...MA Valve bodies in through 2 sizes are rated for 250 PSIG max Valve bodies in 2 through 4 sizes are rated for 125 PSIG max Maximum Pressure Drop through the Valve The Pressure Drop is the change in pr...

Page 4: ...n tailpieces of unions on piping first and then tighten both valve union nuts simultaneously Positioning the Indicator The Model W91 94 Self Operating Regulator contains an intergral dial thermometer...

Page 5: ...abuse Coil all excess tubing and place in a cool location If motion or vibration may occur secure the tubing to the bulb mounting so all moves as one If vibration or fluid pulsations may be transmitte...

Page 6: ...acking seal is self adjustable See fig 2 below Fig 2 Do not tighten the packing nut beyond finger tight Leakage should never be tolerated Any leak at bonnets unions plugs etc requires immediate correc...

Page 7: ...t V rings and flat side out e Packing nut 10 Tighten packing nut all the way down onto the bonnet to push all rings down into the stuffing box and to obtain proper spring load on the assembled rings T...

Page 8: ...eventing the valve from closing Disassembly of the valve may be required See section on Reversing Valve Action b If debris is successfully removed and valve reassembled repeat step 2 c If no motion is...

Page 9: ...cially cool with ice if necessary 3 Record the current actuator adjusting screw setting relative to the reference scale 4 Turn the actuator adjusting screw in up to reference number 8 5 Place valve st...

Page 10: ...o hold the valve body remove both the bonnet and the bottom plug from the valve body See Figure 7 Never use a wrench or vise on the bronze body 5 Look into the valve body on the side the valve plug wa...

Page 11: ...Replacing Valve Stem Packing 14 Install the bottom plug using a suitable thread compound 15 Replace the locknuts and reassemble the valve to the actuator See Replacing the Valve Body Assembly 3 WAY R...

Page 12: ...sizes flanged ends E G F MIXING FLOW DIAGRAM TEMPERATURE COLD B C CLOSED A TEMPERATURE SET POINT B A C TEMPERATURE HOT B A C CLOSED DIVERTING FLOW DIAGRAM TEMPERATURE COLD B C CLOSED A TEMPERATURE SET...

Page 13: ...to OPEN Valve WATER INLET STEAM OR WATER RETURN Influence Side Process Side FROM PROCESS RETURN TO PROCESS HEAT EXCHANGER HEATING Connect Upper Port C to Water Glycol Return and Lower Port B To Heat E...

Page 14: ...Operating Regulator W91 with In to Close Valve STEAM INLET FUEL OIL STORAGE TANK PUMP HEAT EXCHANGER Process Side Influence Side STEAM RETURN TO TRAP THEN BOILER Sensor installed into pipe line using...

Page 15: ...agitation 3 Tube system assembly has lost pressure fill 3 Replace the thermal actuator 4 Stem adjustment too small 4 Readjust Closes with temperature increase 5 Foreign material under seats holding va...

Page 16: ...ure 6 Heat exchanger not large enough 6 Replace with proper capacity 7 Faulty steam trap 7 Install trap of proper capacity 8 Heat exchanger not large enough 8 Replace with proper capacity Opens with t...

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