Pipeline ancillaries Diffusers
10
Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2026
TI-P155-06 CMGT Issue 5
DF2 Diffuser
Description The Spirax Sarco diffuser is a compact unit designed to be fitted to the outlet of steam traps discharging into flooded condensate return lines. It reduces the problem of noise and waterhammer when the flash steam formed on discharge from the steam trap condenses due to rapid cooling.
Materials
2
Sizes and pipe connections ½" and ¾" screwed BSP T Rp (ISO 7-1) / NPT ½" socket weld ends to BS 3799 Class 3000
1
Pressure/temperature limits
3
Steam saturation curve
2
Pressure bar g
7.10.1
The product must not be used in this region.
No.
Part
Material
Stainless steel Stainless steel Stainless steel
1
Case
ASTM A240 Gr. 304
Maximum body design conditions
PN40
PMA Maximum allowable pressure
40 bar g
2
End boss
ASTM A351 CF8
TMA Maximum allowable temperature
400 °C
PMO Maximum operating pressure
32 bar g
3
Internals
ASM A580 Gr. 304
TMO Maximum operating temperature
400 °C
10.9 2
Designed for a maximum cold hydraulic test pressure of:
60 bar g
Dimensions/weights (approximate) in mm and kg
B
Installation The DF2 should be fitted on the outlet side of the steam trap ensuring that the directional arrow on the body is in the flow direction.
Size
A B C
½" ¾"
76 40 32
How to order Example: 1 off ½" Spirax Sarco DF2 diffuser, screwed BSP.
A
78 40 32
Size
Weight
½" ¾"
0.3
0.3
C
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