What is indicated if the high side control needle valve and low side control needle valve are both opened, but the gauge reading does not lower?

What is indicated if the high side control needle valve and low side control needle valve are both opened, but the gauge reading does not lower?

• A. There is a blockage in the system
• B. The assembly is functioning correctly
• C. Shut off valve number 2 may be closed
• D. Fluid is leaking out

Answer: (C)

When both the high side control needle valve and the low side control needle valve are opened, and there is no decrease in the gauge reading, this suggests a potential issue with fluid flow within the system. If shut-off valve number 2 is closed, it would prevent fluid from circulating properly. This stall in flow would maintain the pressure readings, indicating that the system is not operating as it should. Recognizing that blockage or leaks would typically manifest in other noticeable ways, understanding that valve closures can directly impact pressure readings clarifies why the condition of shut-off valve number 2 is significant. If it is indeed closed, it would prevent the expected pressure drop, leading to a static reading on the gauge.

When both the high side control needle valve and the low side control needle valve are opened, and there is no decrease in the gauge reading, this suggests a potential issue with fluid flow within the system. If shut-off valve number 2 is closed, it would prevent fluid from circulating properly. This stall in flow would maintain the pressure readings, indicating that the system is not operating as it should.

Recognizing that blockage or leaks would typically manifest in other noticeable ways, understanding that valve closures can directly impact pressure readings clarifies why the condition of shut-off valve number 2 is significant. If it is indeed closed, it would prevent the expected pressure drop, leading to a static reading on the gauge.