HOW IT WORKS

IN STANDARD THERMOSTATIC STEAM TRAPS

A horizontal orifice is drilled in the seat ring creating a passage 
on the top face.  This allows a small quantity of steam and 
condensate to pass even when the trap closes completely.

SLR SEAT RING

IN SANITARY THERMOSTATIC STEAM TRAPS

An orifice is drilled in the valve from one of the wrench flats to the centerline.  Another orifice is drilled from the tip of the valve, at centerline, until the two orifices meet perpendicularly.

SLR VALVE

IN FREE FLOAT (NFT) STEAM TRAPS

The orifice is drilled in the thermostatic air vent portion of the steam trap.  The orifice is drilled perpendicular to the air vent discharge to the trap body downstream of the valve disc and seat.  This allows a small amount of steam and condensate to bypass the air vent at all times whether it is open or closed.

SLR AIR VENT

DESCRIPTION

Under start-up or heavy load conditions, the main valve of the trap is fully open providing condensate discharge at capacity rates.  As condensate load diminishes and the trap shuts, condensate flow is terminated.  Light loads that arise will be discharged through the secondary (SLR) orifice.  Any increase in condensate load, which is more than the SLR orifice can handle, will be passed to the main valve for immediate discharge.

In systems such as rotary dryers and corrugators, that use siphon equipment, steam can reach the trap prior to the condensate.  This creates a “steam lock” that breaks the siphon process and blocks condensate flow.  The SLR feature will pass this steam immediately and allow for the continuous discharge of condensate.

WHY USE THE SLR FEATURE?

      1.        Specify where immediate elimination of condensate 
       and increased sensitivity is desired.
2.        Improve trap performance in applications where 
       condensate must be lifted upstream of the steam trap.
3.        When it is necessary to discharge condensate at higher 
       temperatures for improved system thermal efficiency.
4.        When condensate must be lifted in a siphon application.

ADVANTAGES

      1.        Prevents steam locking
2.        Provides continuous steam and condensate bleed.
3.        Increases rangeability of steam trap.
4.        Eliminates light condensate load dribbling.
5.        Increase main trap seat life by 
       reducing wire draw or steam cutting.
6.        Balances pressure across main valve.
7.        Reduces trap response time to condensate loads.

AVAILABLE: N125, N450, TA500, UMT450, A, B, C, CS, NFT250, NFT650, CDS200, CDH200, AND DS200