Boost Flow Characteristics: The boost flow characteristics can be found in the servo valve, where the slope of the curve represents the flow coefficient of the servo valve.
No-Load Flow Characteristics: When the load pressure is zero, the input current continuously cycles between the positive and negative no-load currents.
Pressure Gain Characteristics: At the rated pressure, when the load current is zero (with the working port closed), there is a continuous variation cycle between the positive and negative rated currents. The boost range is related to the valve opening type, so the boost range curve can reflect the coordination of zero opening of the valve.
Advantages of the D661-4697C Servo Valve:
The valve body features an inlet design, with optional X and Y ports for external pilot stage control and leakage.
By reducing the valve spool drive area in the D662-D665 models, the following advantages are achieved: improved dynamic response, allowing small pilot stage flows to drive the spool quickly.
The fail-safe design allows the main spool to move to an unknown position in the event of a short circuit, power failure, or drop in oil pressure, by adjusting the spring and valve.
The D660 series proportional servo valves come in two types: two-stage and three-stage structures. The two-stage proportional servo valve is mainly used in applications where small signals require high resolution and high dynamic response. The three-stage servo proportional control valve integrates fast response, optimal spool movement dimensions, and an integrated circuit board, offering superior control performance.
Impact of Fluid Contamination on MOOG Valve Lifespan and Reliability:
Contaminated working fluid can impact product performance, shorten valve lifespan, and lead to product failure. Users must pay special attention to the contamination level of the system's working fluid. A hydraulic system with a MOOG valve must be thoroughly cleaned.
Cleaning Procedure for New or Replaced Lubricant in the Hydraulic System:
Pre-installation: Disassemble, acid wash, and phosphatize the lubricant.
Post-assembly: Clean the system using the lubricant. During flushing, the MOOG valve should not be installed, but a flushing plate can be mounted on the valve seat.
If the system allows, a check valve can be installed to simultaneously clean the working ports and actuators. Cleaning oil (preferably special low-viscosity cleaning oil or hydraulic oil of the same brand) should be introduced into the cleaning fluid.
Product Features of the D661-4697C Servo Valve:
The D660 series incorporates a new servo jet predecessor, enhancing the dynamic characteristics of the valve.
The internal flow path design of the high-flow valve significantly increases large flow capacity. The main spool position is feedback-controlled by a displacement sensor, and the spool movement is controlled by a built-in electronic component in a closed-loop system.
In the event of an unexpected power failure, the fail-safe function ensures that the machinery and equipment remain in a safe state.
The flow utilization efficiency is greatly improved (over 90% of the previous flow is utilized), which helps reduce energy consumption. This benefit is particularly suitable for machines using various proportional valves.
