Valve control unit for a hydraulic elevator

Control valve unit (28) for an hydraulic elevator, comprising:

• control valves (5, 15) and pilot valves (5v, 15v) for controlling the flow of hydraulic oil from a tank (11) to a lifting cylinder (3) driving an elevator cabin (1) and/or from said lifting cylinder (3) to said tank (11), wherein for an upward movement of said elevator cabin (1) said hydraulic oil can be conveyed by means of a pump (10) driven by an electromotor (12) from said tank (11) through a control valve unit (28) to said lifting cylinder (3) and for a downward movement of said elevator cabin (1) said hydraulic oil can be conveyed through said control valve unit (28) to said tank (11), wherein each of said upward movement and said downward movement of said elevator cabin (1) is controlled by one single pilotable control valve (5, 15), respectively, provided to act as a check valve as well as a proportional valve and wherein each of said control valves (5, 15) includes one single flow restrictor (35;
• 55) which is shiftable with respect to a seat (36;
• 56) and said flow restrictor (35;
• 55) is subject to the action of a return spring (37;
• 57) on one hand and of a pilot valve (5v;
• 15v) each of which being actuable by an electrically selectable proportional magnet (5M;
• 5M) and in said control valve (15) controlling the upward movement, the return spring (57) thereof and the pilot valve (15v) thereof act on the flow restrictor (55) thereof in a closing direction, said flow restrictor (35) of said control valve (5) controlling the downward movement and said flow restrictor (55) of said control valve (15) controlling said upward movement have the same shape and dimensions and said control valve (5) controlling the downward movement force transmission from said pilot valve (5v) thereof is effected by means of a piston (48) acting against a main valve regulating spring (49) via a control rod (50) to an opposed piston (38) which via a check rod (39) fixed thereto moves said flow restrictor (35), the diameter of said opposed piston (38) being equal to the diameter of said flow restrictor (35).

Control valve unit (28) for an hydraulic elevator, comprising:

• control valves (5, 15) and pilot valves (5v, 15v) for controlling the flow of hydraulic oil from a tank (11) to a lifting cylinder (3) driving an elevator cabin (1) and/or from said lifting cylinder (3) to said tank (11), wherein for an upward movement of said elevator cabin (1) said hydraulic oil can be conveyed by means of a pump (10) driven by an electromotor (12) from said tank (11) through a control valve unit (28) to said lifting cylinder (3) and for a downward movement of said elevator cabin (1) said hydraulic oil can be conveyed through said control valve unit (28) to said tank (11), wherein each of said upward movement and said downward movement of said elevator cabin (1) is controlled by one single pilotable control valve (5, 15), respectively, provided to act as a check valve as well as a proportional valve and wherein each of said control valves (5, 15) includes one single flow restrictor (35;
• 55) which is shiftable with respect to a seat (36;
• 56) and said flow restrictor (35;
• 55) is subject to the action of a return spring (37;
• 57) on one hand and of a pilot valve (5v;
• 15v) each of which being actuable by an electrically selectable proportional magnet (5M;
• 5M) and in said control valve (15) controlling the upward movement, the return spring (57) thereof and the pilot valve (15v) thereof act on the flow restrictor (55) thereof in a closing direction, said flow restrictor (35) of said control valve (5) controlling the downward movement and said flow restrictor (55) of said control valve (15) controlling said upward movement have the same shape and dimensions and said control valve (15) controlling the upward movement force transmission from said pilot valve (15v) thereof is effected by means of a piston (68) acting against a main valve regulating spring (69) via a control rod (70) to said flow restrictor (55) and that said flow restrictor (55) is solidly connected to an opposed piston (58) via a check rod (59), the diameter of said opposed piston (58) being equal to the diameter of said flow restrictor (55).