MOOG D634 Series Electric Hydraulic Servo Valve
Product Description
Original MOOG German hydraulic servo valves including models D634-1019 through D634-1032. High-performance electric hydraulic servo valves designed for precision control in industrial applications.
Technical Specifications
| Specification |
Value |
| Nominal Diameter |
25cm |
| Material |
Cast Iron |
| Place of Origin |
Germany |
| Functional Purpose |
Building Materials Industry |
| Operating Temperature |
36°C |
| Customization Available |
Yes |
| Imported |
Yes |
Available Models
D634-1019, D634-1023, D634-1024, D634-1025, D634-1026, D634-1027, D634-1028, D634-1029, D634-1031, D634-1032
Related Models
D633-308BR08KO1M0NSM2, D633-313BR16K01M0NSM2, D633-317B, D633-380B, D633-460B, D633-473BR08KO1F0VSX2, D633-500B, D633-7205, D633-7369, D633-E714A, D634-319CR40KO2M0NSP2, D634-341C, D634-371C, D634-381CR24K02MOVSP2, D634-501AR40KO2M0NSM2, D634-514A, D634-514C, D661-4070, D661-4108, D661-4209, D661-4303EG75JOCA6VSX2HA, D661-4359CG35J0AA5VSX2HA, D661-4443CG45JOAA6VSX2HA, D661-4444CG60JOAA6VSX2HA, D661-4455EG35H0C06VSX2HA, D661-4469CG75JOAA6VSX2HA+B97007-061, D661-4495E, D661-4506CG23JOAA6VSX2HA, D661-4538C, D661-4539C, D661-4546C, D661-4561C, D661-4577CG45H0AA4VSX2HA, D661-4591E G45HOCA4VSX2HO, D661-4636 G60KOAA5VSX2HA, D661-4651, D661-4652, G631-3016B, D661-4697C, D661-4770, D661-4900P60HAAM4VSX2-A, D661-4923P80HAAM7NSX2-A, D661-6428EG15KBC06NSX2HA, D661-6460C, D662-4010, D662-4014D01JABF6VSX2-A, D662-4049, D662-4069B, D662-4308K, D662-Z4334KP01JOMF6VSX2-A, D663-4007L03HABD6VSX2-A, D663Z4305KP03JXNF6VSX2-A, D663Z4323KP03JONF6VSX2-A, D664-P05JAMO5NSX2-O, D665-4753P15HAJM6SEA2-E, D691-072D-6, D761-4361BS63KOGA5VPL, D765-1099G, D791-4028S25JOQB6VSX2-B, D791-5017, D951-2105-10HPR18A1RKP019SM28F1Z00, D952-2009-10, D956-2003-10, D957-2003-10HPR18A7RPK140TM28R1Z00, G122-829A001, G631-3002B, G631-3016B, G631-3003AH20JOFM4VBR, G631-3004BH40J0FM4VBR, G631-3006BH75JOFM4VBR, G631-3008B, G761-3001B, G761-3002BH10JOFM4VPL, G761-3003BH19JOGM4VPL, G761-3004B, G761-3005BS63JOGM4VPL, G761-3008B, G761-3006B, G761-3007B, G761-3009B, G761-3033B
Installation Requirements
- Filtration: Install a precision filter with a rating of 5 microns or less upstream of the servo valve
- System Flushing: Thoroughly flush the entire hydraulic system before installation
- Mounting: Can be mounted in any orientation with proper port alignment
- Connections: Use O-ring seal connections (SAE J1926)
Troubleshooting Guide
| Symptom |
Possible Cause |
| Servovalve does not follow input command |
1. Open coil or coil leads
2. Clogged inlet filter |
| Poor response |
1. Clogged inlet orifices or nozzles
2. Partially clogged filter
3. "Sticky" spool |
| No response to electrical signal |
Shorted coil assembly |
| Low flow gain |
1. Incorrect null adjustment
2. Partially plugged orifice or filter |
Maintenance Requirements
- Maintain hydraulic fluid cleanliness (ISO DIS 4406 Code 16/13 maximum)
- Change oil every six months
- Maintain oil temperature between 40°C to 50°C
- Regular inspection, cleaning and lubrication
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