A normally open control valve is open under which control pressure condition?

Prepare for the HVAC D-2 License Exam. Study with flashcards and multiple-choice questions. Each question comes with hints and explanations. Get ready for your HVAC certification!

Multiple Choice

A normally open control valve is open under which control pressure condition?

Explanation:
Normally open means the valve is open when there is no control pressure. With zero psi on the control line, the actuator isn’t energized, so the valve remains open and fluid can flow. Applying a control pressure (for example, 5 psi) moves the actuator to close the valve or reduce its opening, depending on the design. So the valve is open under zero (0) psi of control pressure.

Normally open means the valve is open when there is no control pressure. With zero psi on the control line, the actuator isn’t energized, so the valve remains open and fluid can flow. Applying a control pressure (for example, 5 psi) moves the actuator to close the valve or reduce its opening, depending on the design. So the valve is open under zero (0) psi of control pressure.

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