The MCV116F3118 is a single‑stage, stand‑alone pressure control pilot valve that uses internal hydraulic reactions to maintain a closed‑loop pressure proportional to the applied electrical input. Common failure modes include coil burnout or insulation breakdown, hydraulic seal wear leading to leakage of differential pressure, and contamination of the hydraulic fluid causing sluggish response or stuck flapper. Initial diagnostics should verify the 24 V (or specified) control supply voltage at the coil terminals, inspect for any visible fluid leaks or debris in the pilot chamber, and confirm that the output differential pressure matches the expected setpoint under test conditions; reviewing any fault codes on the associated servo drive or PLC can also pinpoint electrical versus hydraulic issues.[oss-gpt-20b]