Armstrong 981 3/4 in NPT Inverted Bucket Steam Trap, 5/64 in orifice

Armstrong's 980 Series inverted bucket steam traps (models 981 and 983) are cast iron traps with a free-floating mechanism that has no fixed pivots to wear. A leverage system opens the valve against system pressure and the discharge orifice at the top of the trap stays clear of dirt.

Part D501481 is the Armstrong 981 in 3/4 in NPT with a 5/64 in orifice.

Model 981 specifications

• Maximum Capacity: 1,210 lb/hr (5500 kg/hr)
• Maximum Allowable Pressure: 600 psig @ 650°F (41 bar @ 343°C)
• Body Material: ASTM A216 WCB Cast Steel
• Maximum Operating Pressure: 600 psig (41 bar)
• Connection Type: Screwed Socketweld Flanged
• Connection Size: 1/2″ (15 mm) 3/4″ (20 mm)
• Flow Direction: Horizontal

Manufacturer documentation: data sheet, installation and maintenance manual.