HYDRAULIC VALVE CONTROL UNIT Russian patent published in 2009 - IPC F15B13/43 

FIELD: instrument engineering.

SUBSTANCE: said unit is designed for valve control of operating fluid to various hydraulic consumers. The unit comprises a square metal case with internal channels, four external branch lines and independent tank ports, pilot-operated valves consisting of a gate, a pilot, a flange with supply, branch and tank ports with in-built end cap in one of two control pressure supply (branch) channels to the gate, the return valves in-built in branch channels of external branch and supply lines of operating fluid. The initial position of the unit involves combined number and arrangement of plugs in the flanges, the return valves supplying control pressure from external supply and branch lines to the gates of the controlled valves thereby changing between normally opened on normally closed positions thereof and on the contrary. There are twelve such positions, and further changing of the unit positions is carried out by combination and number of the pilots actuated by electric means. The return valves ensure supply (branch) of operating fluid to any of four external lines.

EFFECT: high leak tightness, handling ease and ease of fabrication; high reliability and maintainability.

9 dwg