B34S Series Regulator

B34S Series Regulator

Max BTU Capacity: 7,500 scfh
Available in 1-1/4 in. through 2 in. connection
Interchangeable brass orifice
Upper diaphragm plate of plated steel
Zinc with dichromate plated steel lever
One piece molded Buna-N valve seat
Alodined aluminum valve stem
Spring loaded internal relief valve assembly
Stainless steel vent screen
Molded diaphragm consisting of Buna-N and nylon
Stainless steel lever pin


The B34S is a spring-loaded, self-operated regulator available with or without internal relief. It combines the B31 8″ diaphragm case with the B34 valve assembly for an economical solution to mid-range commercial and industrial applications. Among its attributes are an adjustable loading ring for controlled boost at high flows, precision breather opening to ensure proper stability under all conditions, and in the R model, a high capacity internal relief valve. All critical parts are either steel or aluminum, not plastic, to ensure reliability.

Additional information


Commercial, Industrial

Regulator Type

Spring Loaded Regulator


NPT, Flanged

Connection (Inlet)

1.25 NPT, 1.5 NPT, 2 NPT

Connection (size)

1.25 NPT, 1.5 NPT, 2 NPT

Range in PSI

4" w.c. – 2 PSIG

SCFH or BTUs (in 1,000s)

6000-9000, 4000-6000, 2000-4000, 1000-1500, 750-1000, 500-750


N, R

Vent Type

Indoor, Outdoor


New Mexico, Texas