1UPS100P35S BXP3990

The 1UPS100P35S BXP3990 valve belongs to the Sequence and Unloading Valves series and is manufactured by Vickers. It is installed as a control element in hydraulic automation circuits to shift flow based on pressure sequencing or to unload pumps during standby. The unit is supplied as a screw-in cartridge that fits an A880 cavity, so it can be integrated directly into a manifold block without external piping. Because the porting is cartridge only, all connections are established internally once the valve is seated. The surrounding housing provides three ports, and the valve itself includes three functional ports to handle inlet, outlet, and pilot lines in a compact form factor. During operation it accepts a continuous flow of 150 L/min while maintaining stable performance between a minimum working pressure of 50 bar and a maximum of 350 bar.

At commissioning the valve is factory set to open at 200 bar, and users can fine-tune this value via a leakproof screw that prevents hydraulic oil escape during adjustment. Internal clearances give a leakage rate of 0.3 cc/min, limiting energy losses when the valve is closed. Overall height is 28.448 mm and the length reaches 109.982 mm, allowing the cartridge to fit in shallow manifolds while still providing the required stroke for the poppet. Vickers standardized the cartridge interface across its product range, enabling maintenance crews to exchange elements without re-machining manifold blocks. Such consistency reduces downtime during routine pressure setting revisions and supports reliable plant operation.