A double POC valve has two pilot-operated check valves built into one housing and requires ________ lines to be connected.

A double POC valve has two pilot-operated check valves built into one housing and requires ________ lines to be connected.

• A. One
• B. Two
• C. Three
• D. Four

Answer: (D)

A double POC valve contains two pilot-operated check valves, and each valve needs its own input and its own output path. Even though the two valves share a single housing, you must connect four external lines in total: two lines bringing pressurized fluid into each valve and two lines carrying the controlled flow out to the respective circuits. The pilot mechanism inside the valve allows each check to open only when commanded, but it doesn’t reduce the number of external connections needed. With fewer than four lines, at least one valve wouldn’t have a proper feed or a proper outlet, so four lines are required to satisfy both check units.

A double POC valve contains two pilot-operated check valves, and each valve needs its own input and its own output path. Even though the two valves share a single housing, you must connect four external lines in total: two lines bringing pressurized fluid into each valve and two lines carrying the controlled flow out to the respective circuits. The pilot mechanism inside the valve allows each check to open only when commanded, but it doesn’t reduce the number of external connections needed. With fewer than four lines, at least one valve wouldn’t have a proper feed or a proper outlet, so four lines are required to satisfy both check units.