I. Basic Information

Model: A67999-200

Compatible series: MOOG 761, G761, 631, D633/D634 series servo valves (including A67999-065)

Filter accuracy: 20 μm (micrometers)

Structure: Stainless steel multi-layer woven mesh + metal end cover, vacuum electron beam welding

Size: Outer diameter approximately φ6 mm, length approximately 12 mm (miniature precision filter element)

Origin: USA / Germany

Status: In production, standard consumable part, stable supply

II. Function and Position

Protect the pilot stage throttle hole / nozzle baffle: Intercept ≥ 20 μm particles, prevent clogging, jamming and wear

Maintain servo accuracy: Control zero drift, hysteresis and resolution, ensure closed-loop stability

Extend valve life: Reduce valve core / valve sleeve wear, reduce unplanned shutdowns

Installation location: Internal oil inlet of servo valve or pilot oil circuit (optional with 10 μm filter element A67999-100)

III. Key Technical Parameters

Filter accuracy: 20 μm

Maximum working pressure: 210 bar (3000 psi)

Working temperature: -20℃ ～ +60℃

Compatible media: ISO VG 32/46/68 hydraulic oil, fire-resistant oil

Sealing material: FKM (fluororubber / Viton)

Pressure difference: ≤ 0.5 bar @ rated flow

IV. Differences from A67999-100 (10 μm vs 20 μm) Table

Model Accuracy Applicable Scenarios Features

A67999-100 10 μm High precision / High pollution-sensitive scenarios More strict filtration, slightly shorter lifespan, slightly higher price

A67999-200 20 μm Standard conditions, cost priority Better flow performance, longer lifespan, higher cost-effectiveness

The same servo valve can only be equipped with one type of accuracy and cannot be mixed; the original factory defaults to 10 μm (A67999-100) and 20 μm (A67999-200), which are mostly used in ordinary conditions or cost optimization projects.

V. Applicable Servo Valves (Part)

A67999-065 (761 Series 10 L/min Servo Valve) G761-3002B / 3003B / 3004B / 3005B

631 Series: D633, D634 Direct Drive Servo Valves

760/79 Series - Some Model Numbers

VI. Replacement Period and Recommendations

Standard Conditions: Replace every 8 to 12 months

Lightly Contaminated: Replace every 12 to 18 months

When zero drift increases, response slows down, hysteresis exceeds the limit, abnormal noise / vibration occurs, prioritize checking the filter element