Controlled Disc Steam Trap - CD-33 Series | Armstrong | Americas

Controlled Disc Steam Trap – CD-33 Series

Controlled Disc Steam Trap – CD-33 Series

Product Specifications


Series CD-33
Capacities To 2500 lb/hr
(1134 kg/hr)
Maximum Allowable Pressure 915 psig @ 752°F
(63 bar  @ 400°C)
Maximum Allowable Temperature 752°F
Body Material ASTM A743 GR. CA40
Stainless Steel
Maximum Operating Pressure 600 psig
(41 bar)
Connection Type Screwed
Connection Size 3/8″ (12 mm)
1/2″ (15 mm)
3/4″ (20 mm)
1″ (25 mm)

Controlled Disc Steam Trap – CD-33 Series

CD-33 Series is a disc-style trap designed to control the trap’s cycle rate. By reducing the cycle rate, the Armstrong CD-33 Series extends its service life well beyond that of typical disc traps. This enhanced performance minimizes maintenance time and greatly reduces steam costs.

The CD-33 Series is designed with three discharge ports, which offer stable disc operation to extend operating life.

The capacities of the Armstrong CD-33 have been engineered specifically for the following applications: large steam main drips, process equipment and HVAC heating equipment on constant pressure.

The CD-33L (low capacity) trap is designed for the low capacity applications of steam main drips and steam tracing lines. By ensuring that the capacities are designed to suit the application—and are not oversized—the CD-33 Series will last longer than other disc traps with excessive capacity ratings. Here’s why:

  • Three-discharge port design
  • Minimum wear with controlled cycling
  • Freeze resistant
  • Hardened seat and disc