Method and device for indication of the position of hydraulically actuated armatures

Method for indicating a position of a hydraulically actuated armature, having a cylinder (1.2) for actuating the armature (1.1) which is connected by means of two hydraulic lines (2, 3) to a switch valve (7) through which the hydraulic lines can be switched between pressure-conducting feed flow and pressureless return flow, wherein

• the flow of the hydraulic fluid flowing through one of the hydraulic lines is converted into a number of electric pulses, each of which pulses corresponds to a pre-determined unit of volume of the hydraulic fluid,
• the switch valve (7) is connected to supply lines (P, T), to which further switch valves (7) are connected for actuating further armatures (1.n), and
• the switch valves (7) are connected via a branch line (T1) to the return line (T) common to all armatures (1.1 to 1.n),
• characterised in that
• at each switch valve (7) in the branch line (T1) to the return line (T), a preload pressure is maintained which is higher than the pressure in the common return line (T), wherein
• by means of a hydraulic means (8) connected to the two supply lines (P, T), the preload pressure in a line portion (Tv) is maintained, to which all switch valves (7) are connected.

Method for indicating a position of a hydraulically actuated armature, having a cylinder (1.2) for actuating the armature (1.1) which is connected by means of two hydraulic lines (2, 3) to a switch valve (7) through which the hydraulic lines can be switched between pressure-conducting feed flow and pressureless return flow, wherein the flow of the hydraulic fluid flowing through one of the hydraulic lines is converted into a number of electric pulses, each of which pulses corresponds to a pre-determined unit of volume of the hydraulic fluid,

• the switch valve (7) is connected to supply lines (P, T), to which further switch valves (7) are connected for actuating further armatures (1.n), and
• the switch valves (7) are connected via a branch line (T1) to the return line (T) common to all armatures (1.1 to 1.n),
• characterised in that
• at each switch valve (7) in the branch line (T1) to the return line (T), a preload pressure is maintained which is higher than the pressure in the common return line (T), wherein
• a preload pressure in the order of magnitude of 3 to 5 bar is B maintained at the switch valves (7).