Velan Design - Velan Bimetallic - Advantages of Design

 

  • Fast Warm-Up
  • STELLITE SEATS
  • 3 in 1 (Trap/Strainer/Check Valve)
  • NO STEAM LOSS !!!!
  • Lower Back Pressures in Condensate System
  • Modulated Discharge

 

JUSTIFICATION FOR VELAN STEAM TRAPS

The Velan Steam Trap design offers a number of benefits for the high pressure/high temperature user.  They include the following:

  1. NO WATER PRIME REQUIRED.  One of the disadvantages of the inverted bucket design is that it requires a water prime in order to close the trap.  When subjected to superheat, this water prime may boil off and fail the trap open, resulting in significant loss of live steam.  The operation of the Velan thermostatic/bimetallic steam trap modulates condensate at a temperature slightly below that of saturated steam.  As condensate forms in the drip leg and lowers the temperature of the bimetallic stack, the closing force of the trap is diminished and the line pressure begins to gradually open the valve, producing a low velocity flow which evacuates the line of condensate.  When the condensate temperature rises in the drip leg due to this flow, the closing force of the bimetallic stack increases and closes the valve of the trap, shutting off flow.  When superheated steam is present in the drip leg and evaporates any condensate present, the closing force of the bimetallic stack increases, closing the trap tighter, and insuring no leakage of live steam.

  2. RAPID AIR VENTING AT STARTUP.  The inverted bucket design has a poor air venting capacity.  The Velan design has a wide open main valve when subjected to ambient temperatures.  At startup, the Velan trap vents all incondensable gases and cold condensate before modulating closed.  This results in a more rapid startup with fewer plant personnel required to supervise venting of main lines during warmup.

  3. NO LIVE STEAM LOSS.  The Velan design employs a positive trapping concept, only opening when condensate is present.  This ensures that no live steam will be lost during operation.  Inverted bucket traps lose live steam as a function of the diameter of the air vent hole drilled into the top of the bucket.

  4. STELLITE TRIM STANDARD.  All Velan steam traps are fitted with Stellite seat facings to resist wear by high pressure flow, dirt and scale.  Velan remains the only steam trap manufacturer to provide Stellite facings in their steam traps.  Stellite is required on all control valves and shutoff valves for steam service.

  5. INTEGRAL STRAINER.  All Velan steam traps are fitted with integral stainless steel screens to protect the trap operating mechanism from damage by dirt and scale.

  6. INTEGRAL CHECK VALVE.  The discharge valve in the trap acts as a check valve providing full back flow control.

 

HOW IT WORKS | ADVANTAGES

WHERE SHOULD THIS DESIGN BE USED?

Velan Bimetallic Operation Flash Presentation