Plastic Back Pressure/Relief Valves
- SB10/SB11 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 on the Teflon® control diaphragm opening the valve, allowing excess pressure to flow downwards through the orifice.

The SB10/11 Series is very sensitive to pressure changes and requires low overpressure to fully open. It is designed for clean fluids only.

Sensitive and Reliable
Designed for Long Life
True Union Ends

PVC, PP, PVDF
Series:	SB10 and SB11
Sizes:	3/8" – 2"
Ends:	True Union Socket, Threaded or ChemFlareTM* Spigot** Bodies with Plain, Socket, Threaded or Flanged ends
Diaphragm:	Teflon® Bonded EPDM
Seals:	EPDM, FPM (Viton®)
	SB10/11 Series Back Presssure/ Relief Valve Data Page
	3/8" to 1-1/2" SB Series Installation and Maintenance Manual
	2" 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.