Hydraulic actuator with dual pneumatic operation applied as hydraulic actuation for hydroelectric power plants

A hydraulic actuator with dual pneumatic operation for hydroelectric power plants comprising:

• a hydraulic actuator drive (47) comprising a base (32) for mounting a cup (36) housing a cylinder (37) of a piston guide which in turn houses a shaft (39) fixed and locked to the mounting cup at an end by means of a guide nut (40);
• and
• a hydropneumatic block (2), wherein the hydropneumatic block comprises:
• a fitting and fixing outlets (3 and 3a) of two pneumatic pumps (4 and 4a) aligned parallel to each other;
• a circular hole (5) with a depth that connects to a high-pressure line, for fitting a 2-way electric coil (6), a 2-position directional hydraulic seat valve (7), side-mounted next to an electrical connector (8), wherein the electrical connector (8) is an electrical connection of the 2-way electric coil (6) for an electric actuation of the 2-position directional hydraulic seat valve (7);
• a first hole (9H) having a first ball housing (10i) locked by a first allen screw (19a) and a second ball housing (10j) in a second hole (91);
• a first passage hole (9) on its front face for mounting a first passage ball (10), such first passage ball being mounted on a first guide pin (11), wherein the first guide pin is pressured by a first compression spring (12), said first compression spring being supported on a first sealing ring (13) which is locked by a first relief valve screw (14) forming a first relief valve assembly (15) responsible for limiting the operating pressure of the system;
• a pressure of the first compression spring (12) is regulated by the first relief valve screw (14);
• a third hole (9a) and a fourth hole (9b) receive, respectively, a third ball (10a) and a fourth ball (10b) used for static and dynamic sealing;
• a first ball assembly (10c) housed in a closure retainer (16) on a side of the hydropneumatics block (2), which fits into a threaded closing screw (17) operated by a handle (18), wherein the closure retainer (16) seals the closing screw (17) which is responsible for activating the first ball assembly (10c) that closes an oil passage hole (9c);
• wherein a closure occurs by means of the tightening pressure of a second allen screw (19) on a fifth ball (10d);
• a sixth ball (10e) is pressed by a first spring (20) which fits into a first fastening screw (21) with a sealing washer (22);
• a regulator screw (23) with a second sealing ring (24) fits into a fifth hole (9d) and receives a nut threading at its opposite end (25) to lock a position of the regulator screw (23) that regulates the oil flow;
• a second ball assembly (10f) is pressed by a second spring (26) fitted and locked by a second fastening screw (27) into a sixth hole (9e);
• an eighth ball fitting (10g) into a seventh hole (9f), and a ninth ball fitting (10h) into an eighth hole (9g) retained by a third allen screw (28);
• a first socket hole (9j) and a second ball assembly (101) are fitted and pressed by a first spiral spring (19b) retained by a third fastening screw (29);
• a second socket hole (9l) and a third ball assembly (10m) are fitted and pressed by a second spiral spring (19c) retained by a fourth fastening screw (29a);
• a third socket hole (9m) and a fourth ball assembly (10n) are fitted and pressed by a third spiral spring (19d) retained by a fifth fastning screw (29b);
• O-rings (52) for sealing oil channels between the hydropneumatic block (2) and the hydraulic actuator drive (47);
• wherein the base (32) is fixed by a set of screws (30) that pass through longitudinal tunnels (31) of the hydropneumatic block (2).