Model 123 Back Pressure/ Relief Regulator

The Model 123 is a relief regulator suitable as a back pressure regulator or bypass valve for controlling inlet pressure between 2 and 350 psig (.14 to 24.2 Barg) (525 psig (36.2 Barg) at 50% build-up). The body has an angle configuration with a side inlet and a bottom outlet. Sizesare 1/2", 3/4", 1", 1-1/2" and 2" (DN15, 20, 25, 40 and 50). Available options include cryogenic construction, NACE construction and a large selection of trim, body and diaphragm materials. It is the most adaptable back pressure/relief regulator Cashco manufactures.


Designed for controlling a wide range of fluids including air,inert gases, cryogenic gas or liquids, sour gas, chemicals,water, fuel oil and steam.

  • Versatile: Five body materials & twenty three trim material com bi na tions allow compatibil i ty with most fl uids.
  • Controlled Compression Composition Seats: Four composition seat materials are available and all use controlled compres sion with metal to metal back up for long, trouble free life.
  • High Capacity: A large orifi ce and diaphragm provide sensitivity with high capacity.