HYDRAFORCE
5621821.18.75

***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 Hydraforce directly.***
The Hydraforce 5621821.18.75 (5621821.18.75) is a screw-in, cartridge-style, internally piloted pilot unloading valve designed specifically for accumulator-type hydraulic systems. Known as the UPCV10-F41, this valve includes an internal check valve and features a fixed reload pressure ratio of 80%. In operation, the UPCV10-F41 initially blocks flow from port 3 to port 4 while permitting flow from port 1 to port 2. Upon reaching a predetermined pressure at ports 2 and 3, the spool shifts to facilitate free flow from port 3 to port 4, effectively unloading the pilot at port 3. Should the pressure at port 2 fall below the established reload value ratio, the valve will close and block flow from port 3 to port 4. The spring chamber of this valve is vented to port 4 for optimal performance. Additional features include an internal check valve and optional fixed reload pressure ratios, contributing to its versatility in various applications. The hardened precision spool and cage ensure long-lasting durability, while a choice of seal options allows for customization based on specific system requirements.