valve is installed in the down stream of sampling
valve responds only to temperature. Under the
normal operation the valve is fully open. If
the sample temperature increases within the
operating temperature (120ºF), The thermal
actuator modulates the valve to close the inlet
orifice. The valve automatically opens as the
thermal actuator cools.
heart of this valve is a solid to liquid phase
change thermal actuator. The actuator contains
Thermoloid® compound which changes phase
from solid to a liquid as the temperature increases.
As phase change occurs the volumes of Thermoloid®
material changes significantly with the liquid
volume greater than the solid volume. Since
Thermoloid® is essentially incompressible
under normal operating loads & it is sealed
into a rigid actuator housing, only piston can
move and extend as the volume increases. This
motion is used to open or close the valve.