When setting the relief valve, every 1/2 turn clockwise will increase how many psi?

When setting the relief valve, every 1/2 turn clockwise will increase how many psi?

• A. 5 psi
• B. 15 psi
• C. 10 psi
• D. 20 psi

Answer: (C)

Relief valves on fire pumps are spring-loaded devices. Turning the adjustment clockwise increases the spring tension, raising the pressure at which the valve opens. In this setup, each 1/2 turn clockwise increases the set pressure by 10 psi, so a half-turn adds 10 psi (a full turn would add 20 psi). This is how you dial in the desired discharge pressure to protect equipment while ensuring adequate flow.

Relief valves on fire pumps are spring-loaded devices. Turning the adjustment clockwise increases the spring tension, raising the pressure at which the valve opens. In this setup, each 1/2 turn clockwise increases the set pressure by 10 psi, so a half-turn adds 10 psi (a full turn would add 20 psi). This is how you dial in the desired discharge pressure to protect equipment while ensuring adequate flow.