Steam traps Fixed temperature discharge
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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 2025
TI-P670-02 CMGT Issue 4
Bydrain Frost Protection Liquid Expansion Trap
Description The Spirax Sarco bydrain frost protection liquid expansion trap is made of stainless steel. It has been specifically designed for protecting water systems from frost damage. This fixed temperature discharge trap continuously monitors the water temperature in the pipes; the trap is firmly closed at 7 °C (45 °F), but as the temperature of the water cools to 2 °C (36 °F) the trap opens, discharging any water in the pipe. Standards This product fully complies with the requirements of the Pressure Equipment Directive (PED). Certification This product is available with certification to EN 10204 3.1.B. Note: All certification/inspection requirements must be stated at the time of order placement.
5.4.2
Sizes and pipe connections ½" and ¾" screwed BSP or NPT
8.4 5
Limiting conditions Body design conditions
PN50, Class 300 to ANSI B 16.34
PMA Maximum allowable pressure
41.4 bar g
600 psi g
TMA Maximum allowable temperature
450 °C
842 °F
PMO Maximum operating pressure
10 bar g
145 psi g
TMO Maximum operating temperature
70 °C
158 °F
Minimum operating pressure for satisfactory operation is:
0.1 bar g
1.5 psi g
The backpressure for correct operation must not exceed 90% of the upstream pressure. Designed for a maximum cold hydraulic test pressure of:
62 bar g
899 psi g
Note: The trap seat is completely open at a water circuit temperature of 2 °C (36 °F) and closed at 7 °C (45 °F).
TI-P670-02 CMGT Issue 4
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Bydrain Frost Protection Liquid Expansion Trap
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