When comparing a DCV with an integrated P-port check valve to one without, the difference is that the P-port has built-in check valve capability.

When comparing a DCV with an integrated P-port check valve to one without, the difference is that the P-port has built-in check valve capability.

• A. The valve is lighter
• B. The P-port has built-in check valve capability
• C. It requires no ports
• D. It cannot be pilot-operated

Answer: (B)

The key idea is that adding a P-port check valve gives one-way flow protection at the pressure port. This means fluid can flow from the supply into the circuit, but it cannot flow backward from the circuit into the supply when the valve isn’t actively pressurized, which is what distinguishes a DCV with an integrated P-port check valve from one without. Other statements aren’t defining features: the weight isn’t guaranteed by having a P-port check valve, the valve still uses ports, and pilot-operability is independent of whether the P-port includes a check valve.

The key idea is that adding a P-port check valve gives one-way flow protection at the pressure port. This means fluid can flow from the supply into the circuit, but it cannot flow backward from the circuit into the supply when the valve isn’t actively pressurized, which is what distinguishes a DCV with an integrated P-port check valve from one without. Other statements aren’t defining features: the weight isn’t guaranteed by having a P-port check valve, the valve still uses ports, and pilot-operability is independent of whether the P-port includes a check valve.