Thermodynamic Steam Trap
 
 
UNISON US-55

 

 

 

  • Streamlined & compact.
  • All stainless steel construction for corrosive resistance.
  • High resistance to waterhammer.
  • Long life due to hardened working parts.
  • Only one moving part, therefore minimal maintenance.
  • Efficient operation under varying loads and pressures.
  • Discharges condensate at steam temperature, to prevent waterlogging.
  • All mating parts have metal to metal seating thereby eliminating sealing material.
  • Non - IBR trap can also be supplied with blow-down valve screwed directly below the strainer unit.
 
US - 55 DIMENSIONS
 
(APPROXIMATE)
IN MILLIMETERS
SIZE
A
B (MAX)
C
WEIGHT
APP. KG.
1/2" & 3/4"
91.5
48.0
75.0
0.9
1"
105
52.0
90.0
1.5

SIZE : 15, 20 & 25 MM.NB
RANGE : MAX. 32 BAR AT 425ºC
SCREWED ENDS
MAX. 44 BAR AT 450ºC
SOCKET WELDED ENDS
CONNECTIONS : SCREWED BSPT OR
N.P.T., SOCKET
WELDED
M.O.C.
BODY, CAP,
DISC.PLUG :
AISI 420
STRAINER : AISI 304
  FOR CONTINUOUS DISCHARGE OF CONDENSATE AT SATURATED STEAM TEMPERATURE, BACK PRESSURE SHOULD NOT EXCEED 50% OF INLET PRESSURE.
   
 
GENERAL INFORMATION
OPERATING PRINCIPLE

Unions or flanges installed on both sides of the trap permits easy maintenance.

The trap should be so placed that it is directly below and as close as possible to the equipment being drained.

It is advisable to install the trap with the disc in horizontal position instead of vertical position to ensure maximum life.

Sight-glasses should be fitted on the outlet, away from the trap for observing its performance.

Horizontal piping to the trap should be such that it facilitates gravity drainage.

Have a collecting leg of a larger pipe size with a dirt pocket before a trap inlet.

Have a bypass line around the trap, where the equipment cannot be shut-down. A standby trap in the bypass line allows uninterrupted service.

It is advisable to have a larger return line to prevent back pressure build-up.

The disc is lifted of its seat by the pressure of condensate or air and flow takes place below the disc to the outlet port, till flashing condensate approaches steam temperature.
 
Force acting on the disc, due to steam pressure in the chamber, forces the disc to remain on the seat against the smaller inlet force.
 
The flow of flash steam below the disc results in a low pressure zone and at the same time builds pressure in the chamber above the disc. The differential pressure forces the disc to the seat resulting in a tight closure.
 
The moment condensate collects below the disc, it reduces heat transfer to the chamber, resulting in steam condensing, which leads to a pressure drop. The higher inlet pressure now forces the disc to rise and the condensate is discharged.

DUE TO CONTINUOUS DEVELOPMENT, WE RESERVE THE RIGHT TO CHANGE SPECIFICATIONS WITHOUT NOTICE

 

 
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