Technical Detail

  • Screwed Ends :ANSI B 1.20.1
  • Socket Weld Ends :ANSI B 16.11

Specification & Features

  • Inbuilt Strainer :Avoids Clogging
  • Screwed Female BSP Taper Ends / Socket Welded Ends
  • Hardened Disc To Withstand Continuous Water Hammering
  • All Stainless Steel Construction :Better Mechanical Properties
  • Seat Integral With Body :No Possibility of Leakage From Joints


The steam trap works on the pressure difference, above and below the disc. Disc is raised from its seat due to incoming pressure. High velocity of flashing condensate create low pressure beneath the disc, at the same time pressure is build up in the chamber that force the disc on the seat. Now the condensates in the chamber decrease the pressure and when it is lower then the inlet pressure, the disc lifts. This cycle repeats again and again. The thermodynamic trap is an extremely robust steam trap with a simple mode of operation. The trap operates by means of the dynamic effect of flash steam as it passes through the trap, The only moving part is the disc above the flat face inside the control chamber or cap. On start-up, incoming pressure raises the disc, and cool condensate plus air is immediately discharged from the inner ring, under the disc, and out through three peripheral outlets Hot condensate flowing through the inlet passage into the chamber under the disc drops in pressure and releases flash steam moving at high velocity. This high velocity creates a low pressure area under the disc, drawing it towards its seat At the same time, the flash steam pressure builds up inside the chamber above the disc, forcing it down against the incoming condensate until it seats on the inner and outer rings. At this point, the flash steam is trapped in the upper chamber, and the pressure above the disc equals the pressure being applied to the underside of the disc from the inner ring. However, the top of the disc is subject to a greater force than the underside, as it has a greater surface area. Eventually the trapped pressure in the upper chamber falls as the flash steam condenses. The disc is raised by the now higher condensate pressure and the cycle repeats The rate of operation depends on steam temperature and ambient conditions. Most traps will stay closed for between 20 and 40 seconds. If the trap opens too frequently, perhaps due to a cold, wet, and windy location, the rate of opening can be slowed by simply fitting an insulating cover onto the top of the trap.

Advantages of the thermodynamic steam trap

  • Thermodynamic traps can operate across their entire working range without any adjustment or change of internals.
  • They are compact, simple, lightweight and have a large condensate capacity for their size.
  • Thermodynamic traps can be used on high pressure and superheated steam and are not affected by water hammer or vibration. The all stainless steel construction offers a high degree of resistance to corrosive condensate.
  • Thermodynamic traps are not damaged by freezing and are unlikely to freeze if installed with the disc in a vertical plane and discharging freely to atmosphere. However, operation in this position may result in wear of the disc edge.
  • As the disc is the only moving part, maintenance can easily be carried out without removing the trap from the line.
  • The audible ‘click’ which occurs as the trap opens and closes makes trap testing very straight forward.

Material Detail

01 Body S.S.CF8 /CF8M /CA-40
02 Screen S.S.304 (20/40 Mesh)
03 Plug S.S. CF8 / CF8M / CA40
04 Disc S.S. CF8 / CF8M / CA40
05 Body Cover S.S. CF8 / CF8M / CA40