The Macon one-pipe steam valve assembly consists of the reliable EVO direct mounting thermostat. The thermostatic head contains a temperature sensitive wax which expands and contracts on a rise and fall of temperature in the sensed area. When the temperature rises above the temperature selected, pressure from the expanding wax closes the valve, preventing or restricting the flow of steam through the radiation unit. When the room temperature drops below the selected temperature, the valve opens and allows an increase of steam flow through the radiation unit. This modulating process continues automatically to maintain the temperature you selected. The OPSK controls room temperature by regulating the amount of air and steam in the radiator.

  • Compact dimensions

    Nickel-plated, forged brass valve

    Thermostat may be locked at or limited to any desired temperature or temperature range

    Actuators may be changed without shutting down the system

    Valve may be installed by dropping the system down to zero pressure

    Individual room control for greater comfort

    Replaceable insert

    Stainless steel spindle

    Fuel savings up to 30%

    Nonelectric - fully automatic

    Prevents over- and under-heating

    Reliability

    Remote thermostats available - call or write for the distributor nearest you!

    Vent and vacuum breaker included

    The OPSK helps to minimize large temperature swings inherent in one pipe steam systems.

  • The OPSK can be fitted with any of our Macon Controls operators:

    EVO (Standard) - Direct mount

    EVO-Z - Direct mount w/Remote sensor

    EVOL - Wall mount w/Remote dial

    EVOLZ - Remote dial & Remote sensor

    MTW-28-SS2 - Direct mount w/Stainless Steel

    VA Series - electric actuator

    ZMC-DDC - Electric actuator for DDC systems

    ZMC-ES - Electric Actuator w/End switch

    MVA-2-10 - Motorized Electric actuator

    MPVC-0-10 - Motorized Electric actuator

  • Maximum Temperature: 248ºF

    Disc Material: EPDM

    Valve Body Material: Forged, nickel-plated brass

    Body Style: Straight Pattern

    Connections: 1/8ʺ male NPT, fits in vent tapping of the radiator

    Temperature Setting Range: 46ºF to 79ºF

    Maximum Movement: 0.125” (3mm)

    Movement: per 1 °F change in ambient .007 (.15mm)