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Unit 6 — Refrigeration System Components
Section 3 — Valves

3.6 — Water Regulating Valves

Water regulating valves maintain stable condensing pressure in water-cooled equipment by modulating condenser water flow in response to refrigerant pressure. This lesson covers application setup, setpoint verification, and diagnosing hunting and scaling problems.

Head Pressure Water-Cooled 313A / 313D

3.6.1 — Water Regulating Valves

Water regulating valves control condenser water flow to maintain condensing pressure/temperature in water-cooled equipment. They typically respond to refrigerant pressure (or temperature) and modulate water flow accordingly, which helps maintain stable head pressure during changing load or entering water temperature.

Application and Setup Considerations

Improper adjustment can lead to excessive water use or unstable head pressure. Confirm entering and leaving condenser water temperatures (°C and °F) and water flow rate (L/s or gpm), and ensure strainers are clean so the valve can control smoothly.

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Scaling & Hunting

If scaling or debris causes the valve to hunt, you will see fluctuating head pressure and erratic condenser performance. Clean or replace the upstream strainer first — this is the most common correctable cause before attributing the problem to the valve itself.

Also confirm that the control setpoint (the refrigerant pressure at which the valve begins to open) matches the design condensing pressure for the refrigerant in use. A setpoint sized for one refrigerant is rarely correct for another without recalibration.

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