Valve Protects Centrifugal Pumps.
A temperature-actuated valve from Therm-Omega-Tech Inc. that
operates without an external power source protects centrifugal pumps
from the damaging effects of high temperature water. The ECONO/HAT/RA
valve is suited for centrifugal pumps that pump water in high rise
buildings, where water temperature can cause rotating parts to expand
and ultimately seize. The valve uses a thermal actuator that opens the
valve when water temperature rises above the desired limit. The actuator
continues to test water until the temperature returns to a safe range,
when the valve modulates back to the closed position, reducing waste.
The valve resists clogs and corrosion, and features an all brass body
and fittings, with a stainless steel spring and plug.