The Q Series pilot is separated from the main valve and connected to it with a male union.
It is normally closed, designed with packless construction and interchangeable on all sizes of main valves. A strainer screen shall be built into the pilot inlet. These regulators are designed to maintain a constant back pressure by discharging excess flow to a lower system pressure or atmosphere. The EQ Series are intended primarily for steam service and provide dead-end shutoff. A Spence� back pressure regulator is not a safety valve and should never be used as such.