Why do we use in chilled water pipe network utilizing 2 way valves on all terminals except the last terminal we use a 3 way valve, also another question what does a pump shutt off pressure means
maybe so at the end of the line if it needed to be discharged in a different direction it could, or in case the other side was frozen or something...... and a pump shut off kills pressure,.
A 3 way valve has water continuously going either to the cooling coil or back to the return loop. This keeps a constant flow of chilled water available in the entire system for the coils to have chilled water immediately, when called for. Without the 3 way valve, chilled water would absorb heat while sitting the lines waiting to be used. Pump shut off pressure can mean the pressure for operating a switch on a water main so the line can not be over pressurized.
A three-way valve on a chiller increases efficiency by allowing return water to mix with a small amount of the water being supplied to the loop. These valves are sometimes mechanical to allow water to recirculate through the chiller to keep the chiller running during low ambient conditions. A pump shut off pressure, is the pressure at which the pump control turns the pump off. If a system needs 60psi to run efficiently, the pump control will be set at 60psi.
