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100 Series Sealed System High Capacity Pressure Relief Valves

Made from hot pressed brass, the 100 Series Pressure Relief Valve, is predominantly used to protect closed-circuit wet heating systems from overpressure. The outlet is one size larger than the inlet to ensure high discharge flow rates.

It has a separate seal seating from the diaphragm to give improved scaling resistance and a cover which is made from OT58 brass. Available in a variety of sizes to suit most installations, it also has a pressure range from 2.5 bar to 5.0 bar with the response pressure indicated on the twist cap. The valve size is determined by the heat output of the boiler as shown in the maximum heating capacity table.

Product Information

Product
Pressure (bar)
Size
Code
100 Series Pressure Relief Valve
2.5
1/2" x 3/4" FxFBSP
PREL100008
100 Series Pressure Relief Valve
3.0
1/2" x 3/4" FxFBSP
PREL100001
100 Series Pressure Relief Valve
4.0
1/2" x 3/4" FxFBSP
PREL100003
100 Series Pressure Relief Valve
5.0
1/2" x 3/4" FxFBSP
PREL100004
100 Series Pressure Relief Valve
2.5
3/4" x 1" FxFBSP
PREL100013
100 Series Pressure Relief Valve
3.0
3/4" x 1" FxFBSP
PREL100014
100 Series Pressure Relief Valve
4.0
3/4" x 1" FxFBSP
PREL100016
100 Series Pressure Relief Valve
5.0
3/4" x 1" FxFBSP
PREL100028
100 Series Pressure Relief Valve
2.5
1" x 1 1/4" FxFBSP
PREL100022
100 Series Pressure Relief Valve
3.0
1" x 1 1/4" FxFBSP
PREL100023
100 Series Pressure Relief Valve
4.0
1" x 1 1/4" FxFBSP
PREL100025
100 Series Pressure Relief Valve
5.0
1" x 1 1/4" FxFBSP
PREL100027
100 Series Pressure Relief Valve
2.5
1 1/4" x 1 1/2" FxFBSP
PREL100032
100 Series Pressure Relief Valve
3.0
1 1/4" x 1 1/2" FxFBSP
PREL100033
100 Series Pressure Relief Valve
4.0
1 1/4" x 1 1/2" FxFBSP
PREL100034
100 Series Pressure Relief Valve
5.0
1 1/4" x 1 1/2" FxFBSP
PREL100036
100 Series Pressure Relief Valve
2.5
1 1/2" x 2" FxFBSP
PREL100044
100 Series Pressure Relief Valve
3.0
1 1/2" x 2" FxFBSP
PREL100041
100 Series Pressure Relief Valve
4.0
1 1/2" x 2" FxFBSP
PREL100042
100 Series Pressure Relief Valve
5.0
1 1/2" x 2" FxFBSP
PREL100046
100 Series Pressure Relief Valve
2.5
2" x 2 1/2" FxFBSP
PREL100052
100 Series Pressure Relief Valve
3.0
2" x 2 1/2" FxFBSP
PREL100049
100 Series Pressure Relief Valve
4.0
2" x 2 1/2" FxFBSP
PREL100050
100 Series Pressure Relief Valve
5.0
2" x 2 1/2" FxFBSP
PREL100055

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