Description Size 63 Component series 3X Max. operating pressure 315 bar Features Pilot-operated 2-way proportional throttle valve in block installation technology Installation dimensions according to DIN ISO 7368 Orifice spool electrically position-controlled Flow in both directions In case of power failure, cable break or disconnection of enable, the orifice spool will automatically move into seat position and block the flow in both directions Can be used for pressure-compensated closed-loop flow control in conjunction with a pressure compensator Completely adjusted unit with integrated electronics (OBE), optionally available with voltage or current interface Product description Valves of type FESE are pilot-operated 2-way proportional throttle valves for block installation for the continuous control of flows. Technical set-up: The valve consists of four main assemblies: Cover (1) with connection surface for pilot oil connections Main valve (2) with orifice spool (3) Pilot control valve (4) with proportional solenoid (5) Integrated electronics (6) with position transducer (7) Command value-dependent position control of the orifice spool (3) and thus defined opening of the orifice (8). The flow depends on the Δp across the orifice (8) and the position of the orifice spool (3). Actual value recording of the orifice spool (3) position by the position transducer (7); command/actual value comparison in the electronics (6); variations are prepared and forwarded as control output for correction of the orifice spool (3) position to the proportional solenoid (5) to the pilot control valve (4). Area ratio of area (14) to area (15) = 2 : 1 for NG25; 32; 40 and 1.6 : 1 for NG50; 63. Flow direction A → B (connect X to A); Flow direction B → A (connect X to B); External pilot oil supply possible via X. When the enable is disconnected, the orifice spool (3) will move onto the valve seat (9) and block the flow direction A → B in a leakage oil-free manner. The spool seal (11) seals port B to the control chamber (12) in a leakage oil-free manner; with internal pilot oil supply observe leakage oil from X via the pilot control valve to Y! Orifice spool position at command value 0 V or 4 mA already regulated, whereas the orifice (8) is still located in the positive overlap. The proportional solenoid (5) moves the pilot spool (4.1) against the spring (13) and opens the connection from control chamber (12) to Y; pressure reduction in the control chamber (12) and movement of orifice spool (3) in opening direction by the pressure in A on the area (15) plus the pressure n B on the annulus area (16). Flow reduction in the proportional solenoid (5); the spring (13) moves the pilot spool (4.1) against the proportional solenoid and opens the connection from X to the control chamber (12); pressure build-up in the control chamber (12); pressure on the areas (14) plus spring force (10) move the orifice spool (3) in closing direction Can be used in connection with a pressure com
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