Description

Spirax Sarco No.8 fixed temperature liquid expansion thermostatic steam trap has an oil filled element set to operate at a fixed temperature. It is easily adjusted to discharge at any temperature between 60°C and 100°C (140°F and 212°F).

Standards and Certification

• Certification: The product is available with certification to EN 10204 2.2
• Note: All certification/inspection requirements must be stated at the time of order placement.

Sizes and Pipe Connections

• ½" screwed BSP or NPT

Pressure/Temperature Limits

Parameter	Value
Body design conditions	PN25
PMA - Maximum allowable pressure	25 bar g (363 psig)
TMA - Maximum allowable temperature	250°C (482°F)
PMO - Maximum operating pressure	17 bar g (247 psig)
TMO - Maximum operating temperature	232°C (450°F)
Designed for a maximum cold hydraulic test pressure	38 bar g (551 psig)

PMO - Maximum operating pressure recommended for saturated steam (17 bar g)

Important

The product must not be used in the shaded region of the chart.

Capacities

The capacity graph shown is based on a trap with the adjustment 3 turns open and handling condensate at 80°C (176°F).

Materials

No.	Part	Material	Standard
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	AISI440B
10	Valve seat gasket	Copper	BS 2870 C102
11	Valve seat	Stainless steel	BS 970 431 S29

Dimensions and Weights (Approximate) in mm and kg

Size	A	B	C	Weight
½"	215 (8.46)	137 (5.39)	32 (1.26)	1.2 (2.6)

Safety Information, Installation and Maintenance

For full details see the Installation and Maintenance Instructions (IM-P018-02) supplied with the product.

Installation note: The trap should be installed with the inlet below the equipment being drained. The outlet should always be above the trap.

Adjustment

The position of the valve head relative to the seat and, therefore, the operating temperature, can be altered by turning the adjustment which serves one end of the element.

Spare Parts

The spare parts available are shown in heavy outline. Parts drawn in a grey line are not supplied as spares.

Available Spares

Spare Part	Consists of
Element set	2, 8, 10, 11

Recommended Tightening Torques

Item	Across flats	Nm
5	15/32 A/F	80-85
11	½" UNF	30-35

How to Order

Example: 1 off ½" BSP Spirax Sarco No.8 fixed temperature liquid expansion steam trap.

How to Order Spares

Always order spares by using the description given in the column headed 'Available spares' and state the size and type of trap.

Example: 1 - Element set for a ½" Spirax Sarco No.8 fixed temperature liquid expansion steam trap.