Technical manual for Moog's D634-P Series Direct Drive Proportional Valve, covering operation, performance, installation, and technical specs.
This document provides technical details for the Moog D634-P Series Direct Drive Proportional Valve, including its operation as a throttle valve for 3-, 4-, and 2x2-way applications. It features integrated 24 V electronics and a permanent magnet linear force motor for precise spool control. The valve is suitable for electrohydraulic systems requiring high dynamic response.
Installation and operation require attention to hydraulic system flushing, proper electrical connections, and adherence to EMC standards. The valve offers benefits such as no pilot oil flow, pressure-independent performance, low hysteresis, and automatic return to center position in case of power loss.
| Operating Pressure Range | Ports P, A, B up to 350 bar (5000 psi); Port T up to 210 bar (3000 psi) |
|---|---|
| Temperature Range | Ambient –20 °C to +60 °C (-4 °F to +140 °F); Fluid –20 °C to +80 °C (-4 °F to +170 °F) |
| Seal Material | FPM, others upon request |
| Recommended Fluid Viscosity | 15 to 100 mm²/s (cSt) |
| Electronics Supply Voltage | 24 V DC (min. 19 V DC, max. 32 V DC) |
| Current Consumption | Max. 2.2 A |
| Command Signal (Current) | 0 to ±10 mA floating |
| Actual Value Output | 4 to 20 mA |
| Spool Stroke Range | Proportional to command signal, centered at 12 mA (0 V) |
Ports P, A, and B can handle up to 350 bar (5000 psi), and Port T up to 210 bar (3000 psi).
Ambient temperature from –20 °C to +60 °C, and fluid temperature from –20 °C to +80 °C.
24 V DC, with a minimum of 19 V DC and maximum of 32 V DC.