MOOG D634-501A Proportional Valve

MOOG  D634-501A Proportional Valve

Product Details Introduction

1、 Infrastructure and Design Characteristics

Direct acting DDV control architecture: MOOG D634-501A adopts a direct acting (DDV) design, which is directly driven by a permanent magnet linear force motor to drive the valve core, eliminating the traditional pilot stage structure and achieving bidirectional displacement control without the need for an external pilot oil source. Compared to the two-stage architecture of D661-4651, it reduces transmission links by more than 40% and valve body volume by 30%, making it more suitable for the narrow installation space of small and medium-sized equipment, such as hydraulic control units for injection molding machines and blow molding equipment.

Integrated electronic control module design: Built in 24V power supply SMD technology integrated circuit board, integrated pulse width modulation (PWM) drive circuit and valve core position closed-loop control function, integrating signal processing, power amplification, and feedback regulation. Without the need for additional servo amplifiers, it can run directly by receiving control instructions, greatly simplifying the system integration process and reducing equipment deployment costs.

Standardized installation and adaptation structure: Adopting ISO 4401 standard 03/05 size installation bottom, supporting various oil circuit configurations such as three-way, four-way, and 2 * 2-way, it can directly replace traditional proportional valves or servo valves without the need to modify hydraulic system valve blocks. This compatibility design gives it significant advantages in upgrading old equipment such as die-casting machines and wood processing equipment.

2、 Core performance and control accuracy

High pressure adaptation and flow characteristics: The maximum working pressure can reach 35MPa, and under 7MPa valve pressure drop conditions, the rated flow covers 10-60L/min (subdivided according to valve core specifications), providing stable power for small and medium-sized hydraulic actuators. Compared to the high flow characteristics of D661-4651, its flow output is more suitable for the control requirements of small and medium-sized equipment such as precision machine tools and test benches, and its linearity is better under low pressure drop conditions.

High frequency dynamic response: relying on the direct driving characteristics of linear force motors, the frequency response reaches 50-70Hz (± 100% input signal), and the 100% step response time is ≤ 12ms, significantly faster than the 25ms of D661-4651. The dynamic performance is not affected by system pressure fluctuations, and can quickly adjust the flow rate according to instructions, effectively suppressing hydraulic system lag and ensuring the motion accuracy of high-speed punching machines and automated robotic arms.

High precision closed-loop control indicators: Electric closed-loop control is achieved through valve core position sensors (LVDT), with hysteresis error less than 0.3% and resolution better than 0.1%, improving control accuracy by more than 60% compared to D661-4651. The minimum controllable flow deviation is ≤ 0.2%, which can meet the requirements of refined scenarios such as semiconductor equipment micro feed and precision pressure regulation.

MOOG D634-501A Product imag

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