Edward 1643 Blow Off Valve Angle
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 1643 Blow Off Valve Angle Standard Features
• Size 11/2 and 2 bodies &
bonnets are forged steel (A105).
• Size 21/2 bodies and bonnets are cast steel
(WCB).
• Bolted bonnet, OS & Y.
• Straightway and angle design.
• Size 11/2 and 2 have hardened stainless
steel disk.
• Size 21/2 has Stellite faced disk.
• Integral Stellite seat.
• Integral backseat.
• 13% chromium stainless steel stem.
• Asbestos-free spiral
Edward 1643 Blow Off Valve Angle
Pressure Class 400 (PN 68) & 600 (PN 110)
FIG. NO. TYPE ENDS NPS (DN)
1641 Globe Flanged 11/2 (40) thru 21/2 (65)
1641Y Globe Socket Welding 11/2 (40) & 2 (50)
1641Y Globe Buttwelding 21/2 (65)
1643 Angle Flanged 11/2 (40) thru 21/2 (65)
1643Y Angle Socket Welding 11/2 (40) & 2 (50)
1643Y Angle Buttwelding 21/2 (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.
