M1 CAN Bus Load-Sensitive Control Servo Valve Group

Applications

Excavator

Loader

Tractor

Combine harvester

Features

350Bar maximum working pressure

65L/min maximum flow rate

Load-sensitive system

CAN bus control improves control precision and simplifies wiring cost

Servo motors enable high-precision and closed-loop control of spool position

Stainless steel valve body, high strength and corrosion-resistant

Flexible module configuration based on a unified hydraulic valve interface

Connecting plates and end plates for open and closed systems

Core Component Structure

Position Sensor

Pressure Compensator

Check Valve

Servo Motor

Spool Return Spring

Connecting Rod

Main Spool

Modular Structure

The directional valves and valve blocks form a modular system of M1 Servo Valve Group. With consistent flange design and valve section models of the same width, they can be used in almost any combination of control valve blocks. The positioning and direction of oil ports A and B are consistent in all models.

Configuration Example

(1) Head Section

With LS sensing port.

LS pressure can be set independently.

With relief valve for total pressure setting.

(2) Working Section

Integrated servo driver, which can control the spool position in real time and set operating parameters through the built-in CAN bus.

Directly driven by a servo motor, no pilot oil source is required, and it has strong anti-pollution capability.

A Port and B Port are equipped with pressure compensation valves.

(3) Function Description and Interfaces

Load-Sensing Principle

It is a commonly used control technology in hydraulic systems. Its core is to adjust the output flow and pressure of the hydraulic pump according to the actual load demand. The maximum load pressure of the directional valve on the control valve block will be transmitted to the variable pump and/or the inlet pressure compensator on the head section through the load-sensing output signal of the control valve block.

Energy Efficiency

By regulating in accordance with the maximum load-sensing pressure rather than the main system pressure, the system leverages the load-sensing principle to minimize energy loss within the precise control range.

Flow Control Independent of Load

By keeping the pressure drop (Δp) at the variable sensing throttle valve constant, the system can compensate for load fluctuations, thereby maintaining a stable flow rate and hydraulic cylinder speed. This method is suitable for valves (two-way or three-way) without a separate pressure compensator, but only for hydraulic cylinders with the highest load pressure selected by the shuttle valve.

Driving Force on the Control Spool

Owing to the constant pressure drop across the sensing throttle valve, the load-sensing system delivers a perfectly uniform driving force throughout the entire spool stroke.

Maximum inlet pressure (Bar):350

Maximum working port pressure (Bar):310

Maximum flow rate at working port (L/min):65

Maximum flow rate at inlet port(L/min):100

P1:G1/2

T:G1/2

LS:G1/4

A,B:G3/8

Compensation type:Digital control (flow inlet and outlet)

Control mode:Flow control,Pressure control,Spool position control,Floating mode

Electrical interface:M16-12P or straight-out cable

Input voltage range:18 - 32VDC

Communication protocol standard:Supports CAN Open

Protection class:IP65