Figure 2-10.—Three-way temperature-regulating valve.
Two-Way Temperature-Regulating Valves
Two-way temperature-regulating valves in liquid-
cooling systems are normally installed in the chilled-
water supply to the heat exchanger with the
thermostatic sensing bulb installed in the distilled-
water outlet from the heat exchanger. The basic opera-
tion of the two-way temperature-regulating valve is
the same as that of the three-way temperature-regu-
lating valve. If the temperature of the distilled water
is above the desired temperature, the two-way valve
gradually opens to increase the flow of chilled water
through the heat exchanger, which keeps the distilled-
water temperature at the desired point.
Both the three-way and two-way temperature-
regulating valves have a manual override feature to
provide uninterrupted service, if the thermostatic
assembly should fail due to damage to the capillary
tubing or any other component of the thermostatic
assembly. With the use of the manual override wheel,
you can set the valve plunger/piston in the required
position to operate the liquid-cooling system by turn-
ing the manual override wheel down (from right to
left) until it touches the spiral pin in the valve stem.
Beyond this point, the valve plunger/piston is forced
down, allowing the flow of cooling medium through
the valve. With the use of the installed thermometers,
you can decide if more or less cooling is needed by
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