Steven Levy Enterprises buys and sells new, unused, and used industrial surplus control valves and regulators. Browse our inventory of control valves and regulators available for purchase. Control valves regulate the rate of fluid flow as the position of the valve plug or disk is changed by an actuator. Regulators typically come in two types; pressure regulators or temperature regulators. A pressure regulator is a valve that controls the pressure of a fluid or gas to a desired value and a temperature regulator valves control a variety of industrial equipment such as tanks and process streams. Tell us what surplus control valves and regulators you have for sale or call us at 713-910-4337.