HYDRAFORCE
5621821.M138

***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.M138 (5621821.M138) 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 features an internal check valve and offers a fixed reload pressure ratio of 80%. In its default state, the valve blocks flow from port 3 to port 4 while allowing flow from port 1 to port 2. When a predetermined pressure is reached at ports 2 and 3, the spool shifts to enable free flow from port 3 to port 4, effectively unloading the pilot at port 3. If the pressure at port 2 falls below the established reload value ratio, the valve automatically closes to block flow from port 3 to port 4. The spring chamber of this device is vented to port 4. Notable features include an internal check valve and optional fixed reload pressure ratios. The hardened precision spool and cage ensure long-lasting performance, while users can select from various seal options tailored to specific application needs.