Principles of Operation
Spartan’s thermoelectric actuators (ME1708 normally
closed) utilize a highly refined wax filled element with
piston/stem and patented packless elastomer seal.
They are silent, extremely compact, inherently fail
safe and can operate on hot and cold water, and low
pressure steam to 15PSI. A PTC (positive-temperaturecoefficient) semi-conductive disc is both temperature
control and heat source, inherently controlling at 90°C
(194°F). The wax is chemically refined to melt at 70°C
(158°F). The element expands in direct proportion to
the amount of wax melted, driving the stem through its
travel to open the valve. No other travel or thermostatic
switches are required. Life expectancy is therefore in
multiple decades and guaranteed by Spartan Peripheral
Devices for 5 years.

Spartan Valve Bodies
These actuators can be installed on a multitude of
Spartan 2 way & 3 way terminal unit control valve
bodies with different types of connections.
Compatible with V240FLT, VN240, V241, V243,
VN243, V245, V246-12F, V243-12I, V320, V321,
and V325 series of zone valve bodies.