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Wandfluh AG, Frutigen, Switzerland, recently redesigned its entire line of NG10 hydraulic spool valves. The valves are based on a cast-body design, which is used for both direct- and pilot-operated valves. All valves in the range are capable of system pressures to 350 bar (5,000 psi) and some can operate at levels to 420 bar (6,000 psi).
Emphasis was placed on the symmetrical design of the valve. As a result, valves exhibit the same flow and pressure characteristics in both operating directions.
Direct-operated valves can control flows to 160 l/min (42 gpm) at a very low pressure drop (∆P). A soft-shift spool valve has been developed to reduce pressure shocks in sensitive systems. Valves can...