VALVES USED IN A CHILLER SYSTEM AND THE TYPICAL VALVE PACKAGE

 VALVES USED IN A CHILLER SYSTEM AND THE TYPICAL VALVE PACKAGE

1.Chilled Water Side Valves

⇒Isolation valve (manual/electric actuated).

⇒ Installed on CHW supply and return lines. 

⇒ Used to isolate chiller for maintenance.

2. Balancing Valve (Manual or Automatic) 

⇒ Ensures correct flow rate to/from chiller. 

⇒ Helps maintain Delta T and proper flow distribution. 

⇒ Located after evaporator outlet (return line).

3. Differential Pressure Bypass Valve (if 2-way valves in system) 

⇒ Prevents excess pressure build-up when terminals shut. 

⇒ Maintains flow through chiller.

4. Flow Switch 

⇒ Senses chilled water flow across evaporator. 

⇒ Safety interlock: trips chiller if flow is lost. 

⇒ Usually paddle type or electronic.

5. Air Vent Valve (Manual or Automatic) 

⇒ Removes air pockets. 

⇒ Placed at high points of piping and chiller headers.

6. Drain Valve 

⇒ For flushing, cleaning, and maintenance. 

⇒ Located at low points or chiller base.

Condenser Water Side Valves (Water-Cooled Chiller only)

1. Butterfly Isolation Valve 

⇒ On condenser water inlet/outlet lines. 

⇒ For maintenance shutoff.

2. Y-Strainer 

⇒ Removes debris before water enters condenser. 

⇒ Protects tubes from clogging.

3. Balancing Valve 

⇒ Regulates correct flow through condenser circuit. 

⇒ Maintains required heat rejection rate.

4. Make-Up Water Valve (Float or Solenoid) 

⇒ Used in cooling tower sump. 

⇒ Maintains water level automatically.

5. Blowdown Valve 

⇒ Discharges excess/concentrated water from cooling tower loop. 

⇒ Reduces scaling.

⚙ Expansion Device

1. Thermostatic Expansion Valve (TXV) or Electronic Expansion Valve (EXV) 

⇒ Controls refrigerant flow into the evaporator. 

⇒ Maintains superheat and efficient cooling. 

⇒ Located between condenser and evaporator.