Распределительные сервоклапаны с механической обратной связью по положению 4WS2EM 10…XH

Description Size 10 Component series 5X Maximum operating pressure 315 bar Maximum flow 180 l/min Area of application in accordance with the Explosion Protection Directive 2014/34/EU: II 1G Type of protection: Ex ia IIC T4 Ga according to EN 60079-0 / EN 60079-11 Features 4/3-way version, can also be used as 3-way version For intended use in potentially explosive areas of zone 0 Valve to control position, force, pressure or velocity 2-stage servo valve with mechanical feedback, 1st stage as nozzle flapper plate amplifier For subplate mounting Porting pattern according to ISO 4401-05-05-0-05 with ports X and Y Dry control motor, no contamination of the solenoid gaps by the hydraulic fluid Wear-free control spool return element External control electronics in modular design, additional safety barrier (separate order) Valve is adjusted and tested Internal/external pilot oil supply and return can be ordered individually Spool with flow force compensation Control sleeve centrically fixed, thus low susceptibility to temperature and pressure Pressure chambers at the control sleeve with gap seal, therefore no wear of the seal ring Filter for 1st stage freely accessible from the outside Product description Valves of the type 4WS2EM are electrically operated, 2-stage directional servo valves with porting pattern according to ISO 4401-05-05-0-05. They are mainly used to control position, force, pressure or velocity. These valves are made of an electro-mechanical converter (torque motor) (1), a hydraulic amplifier (principle: nozzle flapper plate) (2) and a control spool (3) in a sleeve (2nd Stage) which is connected with the torque motor via a mechanical feedback. An electrical input signal at the coils (4) of the torque motor generates a force by means of a permanent magnet which acts on the armature (5), and in connection with a torque tube (6) results in a torque. This causes the flapper plate (7) which is connected to the torque tube (6) via a bolt to move from the central position between the two control nozzles (8), and a pressure differential is created across the front sides of the control spool (3). The pressure differential results in the spool changing its position, which results in the pressure port being connected to one actuator port and, at the same time, the other actuator port being connected to the return flow port. The control spool is connected to the flapper plate or the torque motor by means of a bending spring (mechanical feedback) (9). The position of the spool is changed until the feedback torque across the bending spring and the electromagnetic torque of the torque motor are balanced and the pressure differential at the nozzle flapper plate system becomes zero. The stroke of the control spool and consequently the flow of the servo valve are regulated proportionally to the electrical input signal. It must be noted that the flow depends on the valve pressure drop. External control electronics (separate order) External control electro