Which feature differentiates a PCFC valve symbol from a non-compensated valve?

Which feature differentiates a PCFC valve symbol from a non-compensated valve?

• A. port
• B. arrow across the flow path
• C. check valve
• D. manual override

Answer: (B)

The main idea is that a pressure-compensated flow control valve includes a feedback mechanism that keeps the downstream flow steady as pressures change. In the symbol, that is shown by an arrow drawn across the main flow path. This arrow signals a compensator that adjusts the throttling opening automatically in response to downstream pressure, which is what gives the valve its constant-flow characteristic. Without that arrow, you’d have a simple flow-control valve whose opening isn’t fed back to regulate flow; the actual flow would vary with pressure differences rather than staying constant. The other features listed—ports, a check valve, or a manual override—don’t by themselves indicate compensation, so they don’t distinguish the PCFC symbol.

The main idea is that a pressure-compensated flow control valve includes a feedback mechanism that keeps the downstream flow steady as pressures change. In the symbol, that is shown by an arrow drawn across the main flow path. This arrow signals a compensator that adjusts the throttling opening automatically in response to downstream pressure, which is what gives the valve its constant-flow characteristic.

Without that arrow, you’d have a simple flow-control valve whose opening isn’t fed back to regulate flow; the actual flow would vary with pressure differences rather than staying constant. The other features listed—ports, a check valve, or a manual override—don’t by themselves indicate compensation, so they don’t distinguish the PCFC symbol.