Two-Way Temperature Regulating Valve
The two-way temperature regulating valve (fig.
1-16) is 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.
It is shown as installed in the system on diagrams
figures 1-7 and 1-8. The basic operation of the two-way
temperature regulating valve is the same as the
three-way temperature regulating 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 and when the
thermostatic assembly fails because of 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 turning 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 turning the manual override wheel up or
down. The use of the manual override inhibits the
thermostatic assembly and should only be used when
Figure 1-16.—Two-way temperature regulating valve.
1-14
