EDWARD 1641 GLOBE & 1643 ANGLE BLOW OFF VALVE
Edward valves sold for blow-off service are designed and manufactured to comply with all Boiler Code criteria for valves used in these applications.
Edward 1641 & 1643 Standard Features
• Size 1-1/2 and 2 bodies &
bonnets are forged steel (A105)
• Size 2-1/2 bodies and bonnets are cast steel
(WCB)
• Bolted bonnet, OS & Y
• Straightway and angle design
• Size 1-1/2 and 2 have hardened stainless
steel disk
• Size 2-1/2 has Stellite faced disk
• Integral Stellite seat
• Integral backseat
• 13% chromium stainless steel stem
• Asbestos-free spiral
Pressure Class 400 (PN 68) & 600 (PN 110)
FIG. NO. TYPE ENDS NPS (DN)1641 Globe Flanged 1-1/2 (40) thru 2-1/2 (65)
1641Y Globe Socketweld 1-1/2 (40) & 2 (50)
1641Y Globe Buttweld 2-1/2 (65)
1643 Angle Flanged 1-1/2 (40) thru 2-1/2 (65)
1643Y Angle Socketweld 1-1/2 (40) & 2 (50)
1643Y Angle Buttweld 2-1/2 (65)
Pressure Ratings (B16.34 Standard Class)
Flanged or Welding Ends Class 600 Primary Service
Maximum Boiler Drum Pressure* 935 PSI (64.5 BAR)
Maximum Non-Shock 1480 PSI @ 100°F (102.1 BAR)
*This adjusted pressure rating represents the maximum allowable working pressure for this Class valve in
boiler feed and blow-off line service.
