Two-Way Temperature Regulating Valve

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