Parker Hannifin 623XB-3-8-2 Hydraulic Relief Valve

The Parker Hannifin 623XB-3-8-2 hydraulic relief valve is an adjustable pressure-relief device designed to protect hydraulic circuits by venting excess pressure at a user-set point. With 3/8 in ports, it fits into standard hydraulic lines or manifolds that use that port size. This valve is part of Parker's 623XB family, known for compact, reliable relief control in a range of hydraulic applications. The model is identified by part number 167737 for ordering and reference. In practice, it provides overpressure protection in industrial hydraulic systems and mobile equipment, enabling technicians to dial in the relief setting to suit the specific system pressures and operational conditions. The adjustable feature allows fine-tuning to balance protection and system performance, reducing the risk of component damage due to pressure spikes and helping maintain consistent operation in machines such as presses, conveyors, and hydraulic actuation circuits. For technicians sourcing replacement parts, this Parker valve offers compatibility with Parker hydraulic portfolios and common 3/8 inch port configurations, facilitating straightforward integration into existing hydraulic circuits.