Back Pressure/Relief Valve - SB12 Series

The Chemline SB Series Back Pressure/Relief Valve has two functions. As a back pressure valve, installed in-line downstream of a pump, the back pressure below the metering pump is maintained. When installed in the branch of a tee it is a pressure relief valve. The valve stays closed until inlet pressure reaches the set pressure which is adjusted by turning the spring tensioning bolt. Inlet pressure acts upward against the piston allowing excess pressure to flow upwards through the orifice.

The SB12 Series has a built-in check valve function, desirable for dosing applications. It is not so sensitive as to open with every pulsation from a metering pump.

Designed for Long Life
Ideal for Chemical Dosing Systems
Built-in Check Feature

PVC, PP, PVDF
Series:	SB12
Sizes:	3/8" – 4"
Ends:	True Union Socket, Threaded or ChemFlareTM* Spigot** Bodies with Plain, Socket, Threaded or Flanged ends
Diaphragm:	Teflon® Bonded EPDM
Seals:	EPDM, FPM (Viton®)
	SB12 Series Back Pressure/Relief ValveData Page
	3/8" to 1-1/2" SB Series Installation and Maintenance Manual
	2" to 4" SB Series Installation and Maintenance Manual

* For ChemFlareTM end connectors, consult Chemline.
** PP and PVDF spigot ends have DIN dimensions and will butt fuse directly to Chemline PP and PVDF piping systems.