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Mercer Valve Co. has been engineering and manufacturing state of the art safety relief valves since 1986. Our patented Auto Seat Technology(R) has placed us at the forefront of today's relief valve industry. Our relief valves' patented Auto Seat Technology(R) will give you an extended seat life, which will allow your valve to open, close, seat and seal hundreds of times, saving you hundreds or thousands of dollars.

9100 Series Threaded
For all industrial air, gas, or liquid relief applications, including compressors, separators, heater treaters, scrubbers, dehydrator, free water knockouts, thermal relief, gas production units, transmission and gathering lines, meter runs, gas plants, chemical plants and other industrial applications

9100 Series Mod 20
High Pressure Safety Relief Valves designed for 3000psi to 8700psi and have a field proven soft seat coupled with a new, unique guided disk type PATENTED DESIGN. Expected seat life with Auto Seat Technology(R) is hundreds of "pops". Full length guiding of "low rate" set pressure springs insures accurate, repeatable relief action


9500 Series Pilot Operated - Snap Pilot
Ideal for protecting air and gas pipelines, compressors, and vessels. A complete valve line with API orifice sizes from D through T and Full Bore Orifices form 1-1/2" to 8". Inlet and outlet sizes are available from 1" x 2" up to dual outlet 8" x 10" x 10" valves. The valves feature a low blowdown, reducing product loss.


9500 Series Pilot Operated - Modulating Pilot
Ideal for protecting air and gas pipelines, compressors, and vessels. A complete valve line with API orifice sizes from D through T and Full Bore Orifices form 1-1/2" to 8". Inlet and outlet sizes are available from 1" x 2" up to dual outlet 8" x 10" x 10" valves. The valves feature a low blowdown, reducing product loss.