

Forbes Marshall
Forbes Marshall’s back pressure regulator is a precision engineered products, that guarantees priority sample flow to analyzers, and works in an opposite manner to that of a pressure regulator. This regulator also featues a proprietary Forbes Marshall design.


Watson McDaniel
Watson McDaniel offers the 3040 Series, R-Series, and 10691 Series of relief and back pressure valves. The R-Series and 10691 Series are economically-priced back pressure relief valves for liquid service, while the 3040 series includes air service.