HVAC Two Way and Three Way Control Valve Arrangement (Chilled Water Lines)

This article is about HVAC Two Way and Three Way Control Valve Arrangement (Chilled Water Lines) as per International Codes and standards.

HVAC Two Way and Three Way Control Valve Arrangement (Chilled Water Lines)

1. 2-way control valves shall be located on the discharge of each water coil as shown in figure No. 1. See attachment No. 1
2. 3-way control valves shall be located on the discharge of each water coil as shown in the figure No. 2. See attachment No. 1.
3. Circuit setter or equivalent shall be provided on the discharge side of the water coil, downstream of the control valve, as shown in Figures 1 and 2. See attachment No. 1
4. Balancing Valve (Globe valve) shall be provided around 2-way and 3-way control valves, as shown in Figures 1 and 2. See attachment No. 1
5. Balancing Valve (Globe Valve) shall be provided on the by-pass piping between the supply piping and the third port of a 3-way control valve, as shown in Figure 2. See attachment No. 1
6. By-pass valves shall be located around the Control valves and Flow meters as shown in Figure 1 and 2. See attachment No.1
7. Flush valves shall be provided at the following locations:
   • On the supply pipe of a water coil after the isolation valve, as shown in Figures 1 and 2. See attached
   • On the return pipe of a water coil before the isolation valve, as shown in Figures 1 and 2. See attachment No. 1″
8. Isolation valves shall be provided at the following locations:
   • On the supply pipe of a water coil up-stream of the flush valve, as shown in Figures 1 and 2. See attachment No. 1
   • On the return pipe of a water coil down-stream of the flush valve, as shown in Figures 1 and 2. See attachment No. 1
   • On the suction and discharge branch piping of chilled water pumps and suction strainers, without disturbing chilled water system operation. See attachment No. 1″
9. Pressure gauges or combination pressure/temperature insertion plugs, such as Pete’s Plug, shall be installed on water coils, at the following locations (See attachment No. 1)
   • On the supply pipe, down-stream of the isolation valve, as shown in Figures 1 and 2.
   • On the return pipe, up-stream of the isolation valve, as shown in Figures 1 and 2.
   • On the suction and discharge branch piping of chilled water pumps.”
10. Thermometer wells or combination pressure/temperature insertion plugs, shall be installed at the following locations:
    • On the supply pipe of a water coil down-stream of the isolation valve, as shown in Figures 1 and 2. See attachment No. 1
    • On the return pipe of a water coil up-stream of the isolation valve, as shown in Figures 1 and 2. See attachment No. 1″
    Strainers shall be provided at locations shown in Figures 1 and 2. See attachment No. 1.

Standards Codes and References For HVAC Two Way and Three Way Control Valve Arrangement (Chilled Water Lines)

1. SAES-K-001 — Heating, Ventilating and Air Conditioning (HVAC).
2. HVAC Metal Duct, Hangers and Supports and Insulation Receiving
3. HVAC Chilled Water Piping Lay-out and Support
4. HVAC Condensate Drain Installation | HVAC Engineering

Figure 1- Two-Way Control Valve Typical Arrangement & Figure 2- Three Way Control Valve Typical Arrangement