Hydraulic System Components
Product Models
D633-495B D662-4356K
D765-1089-5 D791-5045
D661-4033 CZ1006C3A
D136-001-008 D137-001-011
D128-011-BA006 D791-5009
Appliions
Hydraulic system, machine tool lubriion system, engineering machinery control
Technical Specifiions
| Parameter | Value | Parameter | Value |
|---|
| Nominal diameter | 25cm | Quantity | 88 units |
| Custom processing support | Yes | Imported | Yes |
| Packing specifiion | 31 | Material | Cast iron |
| Place of origin | Germany | Functional purpose | Building materials industry |
| egory | 1 | Color | Blue |
| Packaging | Boxed | Operating temperature | 36°C |
| Dimensions | 30×40×70 | Type | Valve |
| Structure | Steel | Contact | WhatsApp: +85267220981 |
Product Image
Compatible Models
- D661-4352C/G75HOAA4NSM2-O
- D661-4353C
- D661-4354C
- D661-4355C
- D661-4356C
- D661-4357C
- D661-4358C
- D661-4360E
- D661-4361E
- D661-4362E
- D661-4363C
- D661-4364C
- D661-4365C
- D661-4366C
- D661-4367C
- D661-4368C
- D661-4369E
- D661-4370E
- D661-4371E
- D661-4372E
- D661-4373C
- D661-4374C
- D661-4375B
- D661-4376E
- D661-4377E
- D661-4378E
- D661-4380 EG60HOCA5VSX2HA
- D661-4380E
- D661-4380E/G60HOCA5VSX2HA
- D661-4382C
- D661-4383E
- D661-4384C
- D661-4385C
- D661-4385C/G60KOAA4VSX2HA
- D661-4386C
- D661-4387C
- D661-4388E
- D661-4389 EG35HOCA5VSX2HA
- D661-4389E
- D661-4390E
- D661-4391E
- D661-4392E
- D661-4394C
- D661-4395E
- D661-4396E
- D661-4397E
- D661-4398E
- D661-4399E
- D661-4401C
- D661-4402C
- D661-4405C
- D661-4406C
- D661-4407C
- D661-4408E G75KOCA4NSM2HA
- D661-4409E
- D661-4410C
- D661-4411E
- D661-4412C
- D661-4413C
- D661-4414C
- D661-4415C
- D661-4416C
- D661-4417C
- D661-4419C
- D661-4420C
- D661-4421C
- D661-4422C
- D661-4423C
- D661-4425E
- D661-4426E
- D661-4427C
- D661-4428C
- D661-4429E
- D661-4430C
- D661-4431D
- D661-4432C
- D661-4433C
- D661-4434C
- D661-4436C
- D661-4437D
- D661-4438E
- D661-4439C
- D661-4439C G15HOAA7VSX2HA
- D661-4440E
- D661-4441E
- D661-4442E
- D661-4443C
- D661-4443C 1156-421 G45J0AA6VSX2HA
- D661-4443C G45J0AA6VSX2HA
- D661-4444C
- D661-4444C 1156-421 G60JOAA6VSX2HA
- D661-4444C G60JOAA6VSX2HA
- D661-4444C/G60JOAA6VSX2HA
- D661-4445D
- D661-4446C
- D661-4446E
- D661-4447C
- D661-4448E
- D661-4449C
- D661-4450C
- D661-4451C
- D661-4452C
- D661-4453C
- D661-4453C/G75HOAO4NSD2HA
- D661-4454E
- D661-4455E
- D661-4456C
- D661-4457C
- D661-4462C
- D661-4463E
- D661-4464E
- D661-4465E
- D661-4467E
- D661-4468
- D661-4469C
- D661-4469C 1156-421 G75KOAA6VSX2HA
- D661-4469C G75KOAA6VSX2HA
- D661-4469C/G75J0AA6VSX2HA
- D661-4470E
- D661-4472C
- D661-4473E
- D661-4474C
- D661-4475C
- D661-4476E
- D661-4477C
- D661-4478C
- D661-4479C
- D661-4480E
- D661-4481C
- D661-4482C
- D661-4483E
- D661-4484C
- D661-4506C 1156-421 G23J0AA6VSX2HA
- D661-4506C G23J0AA6VSX2HA
- D661-4506C/G23JOAA6VSX2HA
- D661-4507C
- D661-4507C/G08JOAA6VSX2HA
- D661-4536
- D661-4538C/G35JOAA4VSX2HA
- D661-4539C 1156-421 G35JOAA5VSX2HA
- D661-4539C G35JOAA5VSX2HA
- D661-4576C
- D661-4577C G45HOAA4VSX2HA
- D661-4586E
- D661-4590C G60HOAA4NSM2HO
- D661-4594C G75KXAA5VSX2HA
- D661-4598C/G45H0AA6VSX2HA
- D661-4636
- D661-4636 1156-421 G60KOAA5VSX2HA
- D661-4636 G60KOAA5VSX2HA
- D661-4636/G60KOAA5VSX2HA
- D661-4640
- D661-4642/G45HOAO6VSP2HA
- D661-4647B/G75HOAA4NSD2HA
- D661-4649
- D661-4650
- D661-4651
- D661-4651 1156-421 G35JOAA6VSX2HA
- D661-4651 G35JOAA6VSX2HA
- D661-4651/G35J0AA6VSX2HA
- D661-4652 1156-421 G15JOAA6VSX2HA
- D661-4652 G15JOAA6VSX2HA
- D661-4652/G15JOAA6VSX2HA
- D661-4654
- D661-4664B/G60HOAA4NSD2HA
- D661-4691C
- D661-4697C
- D661-4697C 1156-421 G15JOAA5VSX2HA
- D661-4697C G15JOAA5VSX2HA
- D661-4697C/G15J0AA5VSX2HA
Frequently Asked Questions
What is a Moog electro-hydraulic servo valve?
A Moog electro-hydraulic servo valve is a high-precision component that converts electrical signals into hydraulic power output. It controls hydraulic flow and pressure to regulate position, speed, force, or pressure in systems like industrial machinery, aerospace actuators, and turbine controls. Its design typically includes a torque motor, nozzle-flapper pilot stage, and spool valve for accurate performance.
What are the key features?
- High precision: Control accuracy up to ~0.1%
- Fast dynamic response: Responds within milliseconds
- Programmability: Customizable control algorithms via embedded electronics
- Robustness: Operates in harsh environments (-20°C to 80°C) and resists contamination
- Fail-safe function: Automatic shutdown during power loss or failure
What are common failure modes?
- Torque motor issues:
- Coil breakage (valve fails to respond)
- Armature sticking or ball head wear (causing instability)
- Nozzle/flapper blockages: Clogging from oil contamination reduces response and causes system oscillation
- Spool amplifier problems:
- Edge wear (increases leakage and noise)
- Spool sticking due to contaminated or degraded oil
- Seal aging: Leads to internal/external leakage
How to maintain servo valves?
- Oil quality management: Use recommended fluids (e.g., phosphate ester fire-resistant oil) and maintain cleanliness per NAS 1638 Class 5 standards. Regularly check acidity and resistivity
- Routine inspections: Test for electrical issues (e.g., coil resistance), clean filters, and check for loose components
- Pre-startup checks: Ensure oil circulation before powering the valve to prevent clogging
How to troubleshoot unstable operation (e.g., cylinder drift or oscillation)?
- Check servo valve resolution and zero zone stability
- Inspect for internal leakage or spool wear
- Verify control system parameters and calibrate zero bias if needed
What if the valve doesn't move?
- Confirm electrical signals and coil connectivity
- Check for spool sticking caused by debris in oil
- Ensure correct startup sequence: oil flow before electrical power
Can Moog servo valves be customized?
Yes. Models like the D636/D637 series support fieldbus interfaces and programmable electronics for appliion-specific tuning.
What specifiions should I consider?
- Operating pressure: Up to 350 bar
- Flow rate: 5-100 L/min (at Δp 35 bar)
- Voltage/current: Typically 220V, 1.5A
- Mounting: Complies with ISO 4401 standards
