1. 1 Pressure Reducing valves

2. 2

3. 3 Fill Valve / PRV Pressure Reducing Valve

4. 4 Pressure Reducing Valve Establish cold fill pressure. Check valve. Strainer Valve

5. 5 Pressure Reducing Valve LOCATION WHAT SETTING

6. 6 Why Here Most stable location in The hydronic system

7. 7 WHAT SETTING

8. 8 Pressure Reducing Valve PRV FAN COIL BOILER What Pressure setting? Fill piping so top of system has 4 or 5psi

9. 9 Pressure and Head Equivalence Or: 0.433 psi / Ft. For reference, complete equation: Head (ft) = head (psi) x 2.31 specific gravity

10. 10 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI MINIMUM 5 PSI AT TOP OF BUILDING PRV FAN COIL BOILER

11. 11 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI 60’ height is equal to _____ psi static press PRV FAN COIL BOILER 5psi

12. 12 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI 60’ height is equal to 26psi static press Set to 5psi + 26psi PRV: 30 or 31psi setting FAN COIL BOILER 5psi

13. 13 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI MINIMUM 5 PSI AT TOP OF BUILDING PRV BOILER FAN COIL

14. 14 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI MINIMUM 5 PSI AT TOP OF BUILDING PRV Set @ 5psi BOILER FAN COIL

15. 15 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI Pressure at bottom if set at 20psi at top? PRV Set @ 20psi BOILER FAN COIL

16. 16 Pressure Reducing Valve 4 STORY BLDG. 60 FT HIGH 2.31 FT = 1 PSI Pressure at bottom if set at 20psi at top? 20psi + 26psi = 46psi PRV Set @ 20psi BOILER FAN COIL

17. 17 4 feet 5 feet 10 feet 19 ft / 2.31 ft/psi = 8 psi 8 psi + 4 psi = 12 psi “Cold Fill” or Initial Pressure

18. 18 System Relief Valve Limits maximum system pressure. ASME Code – Section IV –Capacity (BTU’s/Hr) –Pressure relief setting (PSI)

19. 19 The “pressure band” u Upper pressure limit, P 2 u Relief valve setting u Lower pressure limit, P 1 u PRV setting Allowable pressure rise