MOOG D661-4651 servo valve

MOOG  D661-4651 servo valve

Product Details Introduction

1、 Infrastructure and Design Characteristics

Pilot controlled two-stage control architecture: MOOG D661-4651 adopts a two-stage design of "pilot stage+main stage". The pilot stage is a high-performance proportional solenoid driven dual nozzle baffle valve, and the main stage is a large flow four-way slide valve, which precisely controls the displacement of the main stage valve core through the pilot stage. Compared to direct acting structures, it can achieve greater flow output and form closed-loop control with the help of mechanical feedback rods, balancing control accuracy and power density, and is suitable for large hydraulic actuators such as ship servos and forging equipment cylinders.

Modular oil port and installation design: The valve body adopts the ISO 4401 standard installation bottom surface, supporting multiple oil port configurations (such as P, T, A, B four port standard layout and optional fifth oil port), which can directly replace traditional servo valves or proportional valves without the need to modify the hydraulic system valve block. Some models offer flange installation options to meet the spatial layout requirements of different devices and reduce integration difficulty.

Anti pollution and maintenance optimization structure: The main valve core and valve sleeve are made of AISI 4140 alloy steel, which has undergone precision honing treatment, and the clearance is controlled at 2-3 μ m. The surface is plated with hard chromium to improve wear resistance; The pilot stage is equipped with a 20 μ m precision filter, which can filter out small impurities in hydraulic oil and reduce the risk of valve core sticking. Simultaneously design detachable pilot stage components, which can replace pilot components without disassembling the main valve body, reducing maintenance time.

2、 Core performance and control accuracy

High pressure and high flow output capability: The maximum working pressure can reach 35MPa, and under the condition of 7MPa valve pressure drop, the rated flow covers 50-200L/min (depending on the valve core specifications), which can provide sufficient power for heavy-duty hydraulic equipment. Even under high pressure differentials (25-35MPa), the flow output linearity can still be maintained, making it suitable for large load scenarios such as construction machinery and metallurgical rolling mills.

High frequency response and dynamic response characteristics: The frequency response reaches 30-50Hz (± 100% input signal), with a 100% step response time of ≤ 25ms. The pilot stage proportional electromagnet adopts a low hysteresis design, which, combined with the low friction characteristics of the main stage valve core, can quickly follow the control instructions to adjust the flow rate, effectively suppressing the dynamic hysteresis of the hydraulic system and ensuring the control stability of high-speed moving equipment (such as high-speed punching machines).

High precision proportional control indicators: flow hysteresis error is less than 0.8%, linearity is better than 1%, and precise correspondence between valve core displacement and input signal is achieved through mechanical feedback rod. The minimum controllable flow deviation is ≤ 0.5%. In low-speed and low flow fine-tuning scenarios (such as precision pressure control and synchronous motion systems), micrometer level displacement control can be achieved to meet the requirements of high-end manufacturing equipment.

MOOG D661-4651  Product imag

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