Product Introduction: It is a direct-acting valve (DDV) of Moog’s D634 series, with closed-loop position control of the live feedback valve core. It is a throttle-type flow control valve that can be applied to three-way, four-way, and 2 x 2-way valves. It is suitable for electro-hydraulic position, velocity, pressure, or force control systems and other systems requiring high dynamic response.
Technical Specifications: The installation specification (with or without drain) complies with ISO 4401 – 05 – 05 – 0 – 94. The valve port diameter is 11.5 mm (0.45 in). The valve is a single-stage valve, slide valve type with a valve sleeve. The valve core is driven by a permanent magnet linear force motor, without a pilot stage. The weight is 6.3 kg (13.9 lb). The rated flow (±10%) at 35 bar (500 psi) per throttling edge is 60/100 l/min (15.8/26.3 gpm). The maximum flow of the valve is 185 l/min (48.8 gpm). The maximum working pressure of ports P, A, B is 350 bar (5,000 psi), the maximum working pressure of port T (internal discharge) is 50 bar (715 psi), the maximum working pressure of port T (Y port drain) is 350 bar (5,000 psi), and the valve port Y is directly connected to the tank. The response time (valve core 0 – 100% full opening) is ≤ 20 ms. The resolution is < 0.1%.
Functional Features: It is directly driven by a permanent magnet linear force motor with high driving power. No pilot oil source is required, which simplifies the system structure. The dynamic performance is not affected by pressure, ensuring stable performance under different pressure conditions. It has low hysteresis and high resolution, which can improve the control accuracy of the system. The power consumption is low at and near hydraulic zero, saving energy. The standardized valve core position detection signal can be used to obtain the operation status of the system, which is very beneficial to the maintenance of the valve. It supports electrical zero adjustment. In case of power failure, cable damage, or emergency stop, the valve core will automatically return to its spring centering position without external force, ensuring the safety of the system.
Application Scenarios: It is widely used in the metallurgical industry to control the hydraulic system of rolling mills, such as the control of the rolling mill’s pressing device and the transmission system, to ensure the quality and precision of rolled products. It is also used in the construction machinery industry, such as the control of the hydraulic system of excavators and cranes, to improve the operation accuracy and stability of the machinery. In addition, it can be applied to the hydraulic control system of injection molding machines to control the injection speed and pressure, improving the quality of injection molding products.
