The double overcenter valves of the DCVB series are designed to guarantee stability in the working position and control the rotation of a bidirectional hydraulic motor, leaving the opposite side fed by free flow; thanks to the flanged surface, designed according with standard OMP/OMR, the valve can be installed directly on the hydraulic motor with benefits on its performance. A shuttle valve allows to manage the un-locking of the motor brake. By feeding the line opposite the load, the pilot line manages the partial opening of the descent channel allowing control of the actuator movement and avoiding the phenomenon of cavitation thanks to the action of contrasting the gravitational force. The DCVB double overcenter valve also works as an antishock valve in the presence of pressure peaks caused by impacts or excessive loads. For this to be possible, the return line on the distributor must be connected to the drain. The DCVB is a not-compensated valve: any residual pressures on the return line counteract the opening of the valve and rises its setting and piloting values. The use of this type of valve is therefore recommended in systems with DCV with an open center spool. The hydraulic leakproof is a fundamental feature for the overcenter valves. To ensure the best performance, Oleoweb manufactures the internal components of its valves in high-strength steel, hardened and grinded, and, during the production process, carefully checks the dimensions and geometric tolerances of the sealing elements, as well as the seal itself on the assembled valve. DCVB are parts-in-body valves: all components are housed inside a hydraulic manifold, a solution that allows to manage high flow rates while limiting overall dimensions. The manifold is made of steel for operating pressures up to 350 bar (5075 PSI) and high wear resistance; it is protected from corrosion by zinc plating treatment and it is machined on the six faces for a more effective execution of the surface treatment. For applications exposed to particularly aggressive corrosive agents (e.g. marine applications) Zinc-Nickel treatment is available on request. DCVB valves are available in size BSPP 1/2" for recommended working flow rates up to 60 lpm (15,9 gpm). Different calibration fields and pilot ratios and a calibration tamper system are available on request. For optimal operation, it is recommended to set the overcenter valves to a value 30% higher than the maximum working load.