URFA –20S-2.5”
URFA-20-2.5” URFA-25-2.5”
INSTALLATION AND OPERATING INSTRUCTIONS FOR
FIELD ADJUSTABLE PRESSURE REDUCING/
CONTROLLING VALVES
(URFA-20-2.5 MODEL SHOWN)
Страница 1: ...URFA 20S 2 5 URFA 20 2 5 URFA 25 2 5 INSTALLATION AND OPERATING INSTRUCTIONS FOR FIELD ADJUSTABLE PRESSURE REDUCING CONTROLLING VALVES URFA 20 2 5 MODEL SHOWN...
Страница 2: ...UTOFF OPEN CLOSE INDICATION SUPERVISORY SWITCH ENCLOSURE SUPERVISORY SWITCH PLUG TAMPER RESISTANT COVER TAMPER RESISTANT SCREW INDICATION LABEL UPPER BONNET ADJUSTMENT CYINDER HOLE BONNET NUT LOWER BO...
Страница 3: ...s where supply riser pressures exceed 175 psi The URFA valves are Listed by Underwriters Laboratories as Special System Water Control Valves Pressure Reducing and Pressure Control Type VLMT and also m...
Страница 4: ...ld be selected to provide an outlet pressure not exceeding 165 psi at the maximum inlet pressure 5 Upon system completion each Valve must be tested under both flow and no flow conditions to verify tha...
Страница 5: ...independent operation of the valve stem from the manual close push rod this allows for the operator to bypass the large torque required to overcome the stiffness of the adjustment spring INSTALLATION...
Страница 6: ...the pump churn pressure less the elevation loss 7 To determine the valve static outlet pressure refer to the appropriate static chart Locate the valve static inlet pressure on the vertical axis of th...
Страница 7: ...valve is not manually in the fully opened position refer to NFPA 13 for more details on supervisory requirements An optional supervisory switch assembly with UL approval for use with URFA valves is av...
Страница 8: ...gnal Also ensure that the manual handwheel may be fully closed without interference from the supervisory switch assembly VALVE CARE MAINTENANCE URFA valves require minimal maintenance However a routin...
Страница 9: ...ve incorrect valve setting it should be reset to the proper setting and undergo flow and no flow testing to verify proper pressure reduction is obtained Flow test results should be compared to previou...
