H-4WEH 16 J7X/6EG24N9ETK4

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth H-4WEH 16 J7X/6EG24N9ETK4 (R900931176) is a highly sophisticated electrohydraulic directional control valve designed for subplate mounting with porting patterns conforming to ISO standards. This model features a 4-way configuration and is equipped with wet-pin DC or AC solenoids, which can be connected individually or centrally, depending on the application's requirements. It offers multiple types of actuation through internal or external pilot control mechanisms. The valve's main control spool is maintained in a neutral position by pressure centering, ensuring stability and precision in operation. The unit includes spring centering as well as spring end position options, with the ability to adjust for hydraulic end positions. The return springs do not serve a return function but keep the main control spool centered when there's no pilot pressure and during horizontal installation. This model of the H-4WEH series allows for customization through optional features such as manual overrides, switching time adjustments, preload valves in channel P of the main valve, and stroke setting or spool position monitoring capabilities. The internal design principle acknowledges that some internal leakage is inherent but could increase over its lifecycle. For pilot oil supply and return configurations, this valve offers versatility with external supply via channel X from a separate pressure source and external return via channel Y into the tank. For models like ET... and E..., both supply and return are managed internally from channel P of the main valve or via channel T into the tank. It is critical to note that any modifications to the pilot oil supply should only be carried out by authorized specialists or directly at the factory to ensure proper functioning and adherence to maximum operating parameters as outlined in the technical data sheet. Additionally, when dealing with internal versions ET and E, minimum pilot pressures must be observed along with using a throttle insert in port P of the pilot control valve to prevent excessively high-pressure peaks.