ARMSTRONG - Thermodynamic steam traps

Operation of controlled disc traps depends on the changes in pressures in the chamber where the disc operates. The Armstrong CD trap will be open as long as cold condensate is flowing. When steam or flash steam reaches the inlet orifice, velocity of flow increases, pulling the disc toward the seat. Increasing pressure in the control chambers snaps the disc closed. The subsequent pressure reduction is necessary for the trap to open. The heating chamber in the cap and a finite machine bleed groove in the disc control the pressure reduction. Once the system is up to temperature, the bleed groove controls the trap cycle rate.

Unique heating chamber

The unique heating chamber in Armstrong’s Controlled Disc Trap surrounds the disc body and control chamber. A controlled bleed from the chamber to the tap outlet controls the cycle rate. That means that the trap design—not ambient conditions—controls the cycle rate. Without this controlling feature, rain, snow and cold ambient conditions would upset the cycle rate of the trap.

CD-33 Series Disc Trap

For steam pressures up to 600 psig (42 bar) . . .
Capacities to 2,500 lb/hr (1134 kg/hr)

CD-3300 Series Disc Trap

All stainless with 360° connector
For steam pressures to 450 psig (31 bar) . . .
Capacities to 800 lb/hr (363 kg/hr)

CD-40 and CD-60 Series Controlled Disc Trap

Carbon steel
For pressures to 600 psig (41 bar) . . .
Capacities to 2,850 lb/hr (1295 kg/hr)

CD72 Series Disc Trap

For steam service up to 1,010 psig (70 bar) . . .
Capacities to 1,800 lb/hr (816 kg/hr)