Description
Product Overview
Spirax Sarco No.8 fixed temperature liquid expansion steam trap. It is designed to discharge condensate at a preset temperature, making it suitable for shutdown drain applications. The trap features an oil-filled element that allows unrestricted removal of cold condensate, air, and incondensables during start-up conditions.
Key Features
- Adjustable discharge temperature between 60 °C and 100 °C (140 °F and 212 °F).
- Available with 1/2” screwed BSP T Rp (ISO 7-1) or NPT pipe connections.
- Gunmetal body construction with stainless steel valve head and seat.
- Fully open under cold conditions for rapid air and cold condensate removal.
Technical Specifications
Pressure and Temperature Limits
| Parameter | Value |
|---|---|
| Body design conditions | PN25 |
| PMA (Maximum allowable pressure) | 25 bar g @ 110 °C (327 psi g @ 230 °F) |
| TMA (Maximum allowable temperature) | 250 °C @ 12 bar g (482 °F @ 174 psi) |
| Minimum allowable temperature | -29 °C (-20 °F) |
| PMO (Maximum operating pressure for saturated steam) | 17 bar g (247 psi g) |
| TMO (Maximum operating temperature) | 232 °C @ 15 bar g (450 °F @ 218 psi) |
| Minimum operating temperature | 0 °C (32 °F) |
| Designed for a maximum cold hydraulic test pressure of | 38 bar g (551 psi g) |
Materials
| No. | Part | Material | Specification |
|---|---|---|---|
| 1 | Adjustment nut | Brass | BS EN 12165 CW 617N |
| 2 | Overload spring | Stainless steel | BS 970 302 S31 |
| 3 | Element nut | Brass | BS EN 12165 CW 617N |
| 4 | Washer | Brass | BS 2870 CZ 108 |
| 5 | Adjustment lock-nut | Brass | BS EN 12165 CW 617N |
| 6 | Guide screw | Brass | BS 2872 CZ 108 |
| 7 | Body | Gunmetal | BS EN CC 491K |
| 8 | Element | Brass | - |
| 9 | Valve head | Stainless steel | AISI 440B |
| 10 | Valve seat gasket | Copper | BS 2870 C102 |
| 11 | Valve seat | Stainless steel | BS 970 431 S29 |
Dimensions and Weights
| Size | A | B | C | Weight |
|---|---|---|---|---|
| 1/2” | 215 mm (8.46”) | 137 mm (5.39”) | 32 mm (1.26”) | 1.2 kg (2.6 lbs) |
Capacities
The capacity graph shown is based on a trap with the adjustment 3 turns open and handling condensate at 80 °C (176 °F).
Applications
- Shutdown drain trap (outlet must point upwards to enable continuous immersion of the oil-filled element).
- Mains drain trap bypass (piped to a condensate return line).
