The Norgren VP5006BJ111H00 is a G‑1/4 inch, 3/2 pilot/spring manifold proportional pressure control valve rated for 0–6 bar (0–90 psi) with a 0–10 V input and optional 1400 nl/min flow capacity. Common failure modes in this series include loss of proportionality due to wear or contamination of the internal spring‑loaded actuator, electrical drift from degraded solenoid windings, and leakage at the pilot ports caused by seal degradation. Initial diagnostics should verify the 0–10 V signal integrity and supply voltage, inspect the pilot port seals for wear or debris, and review any error codes or pressure sensor readings for indications of valve hysteresis or stuck‑position behavior.[oss-gpt-20b]