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Eaton’s Vickers® HFV (Hydraulic Feedback Valvistor ®) range of slip-in cartridge valves uses a self-regulating hydraulic design for the control of flow rate by a current-controlled PWM signal. The design achieves servo-type control of the main poppet without using an electrical feedback transducer.
The construction and features of these valves open up a wide range of applications with hydraulic cylinders and motors. Such applications include ie casting, deep drawn presses, injection molding, container handling, shovel loaders, forestry and dump trucks. With the addition of HFV valves to the established ISO 7368 (DIN 24342) cartridge valves, Eaton has further enhanced an already comprehensive range.
In “Valvistor” designs a main poppet amplifies a small flow through the pilot circuit, comparable to a transistor. Thus the name “Valvistor”, derived from “valve” and “transistor”. Figures 39 and 40 show the construction of proportional throttles to ISO 7368. In both cases a Vickers type KTG4V-3S proportional valve is used as the pilot control valve. KBTG4V3S-EN427 & KBFTG4V-3SEN427 can also be used as pilot valves. Hydraulic position feedback is obtained by providing the main poppet with a longitudinal slot (5) in its cylindrical surface. This slot, together with a metering edge inside the sleeve, forms a variable orifice between the inlet of the valve and the volume above the main poppet (3). When the valve is closed and the main poppet is seated, the variable orifice area is almost closed.
Maximum Operating Pressure: 350 bar (5000 psi)
Flow Ratings: Up to 2160 Lpm (571 USgpm)
