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Spence Figure 10 Series Safety Relief Valve

Spence Figure 10 Safety Valve

Figure 10 Series

Safety Relief Valve


Figure 10 valves are ASME Code Section IV safety valves designed for industrial and commercial low pressure steam heating boilers and associated equipment. Standard pressure settings for saturated steam service is 15 PSIG.


Available in seven sizes ranging from 3/4" x 1" to 3" x 3", connections are male NPT screwed inlet and female NPT outlet. The cast iron body is rated at 15 PSIG at saturated stream temperature (250°F).

Applicable Codes

Figure 10 safety valve steam capacities are certified by the National Board of Boiler and Pressure Vessel Inspectors, Columbus, Ohio. Built in accordance with requirements of the ASME Section IV Heating Boiler Code, this valve is also approved and registered in every Province in Canada in accordance with C.S.A. B-51 under Canadian Registration No. 02635.1-0.


The Figure 10 valve features tight shutoff, sharp popping and closing action and a high degree of repeatability. The valve inlet and body are one integral casting assuring proper alignment of disc, seat and spindle for smooth action. The disc is located by a disc guide which in turn is held in place by a zinc plated wave spring. The entire assembly is contained by a combination bonnet/compression screw. The simplicity of the design means dependability and low cost.

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