Welcome to the official website of Shanghai Radk-Tech Hydraulic Control System Co., Ltd.
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ABOUT USDedicated to building a company that integrates product R&D, intelligent manufacturing, sales and technical services.
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PRODUCTSMain business includes high-end hydraulic components such as electro-hydraulic servo valves, proportional valves, proportional multi-way valves, high-performance threaded cartridge valves, balancing valves, and hydraulic integrated valve groups.
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APPLICATIONIn the future, Norma Hydraulics will continue to strive forward, aiming to become a significant manufacturer in the high-end hydraulic components segment of the global hydraulic industry.
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RT6313E（D633）
Maximum Working Pressure: 31.5MPa
Rated Flow Rate: 5~40L/min (△P N =7MPa)
- Product Description
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Direct acting proportional servo valve
Features and Benefits
High thrust permanent magnet linear force motor directly drives the spool;
Dynamic response independent of system pressure;
No pilot flow required, lower power consumption;
Low hysteresis and high resolution for excellent repeatabilityStandard spool position monitoring signal;
Electrical gas zeroing;
When the valve is de-energized, the spool is restored to the neutral
position by the centering spring, so that the load is in a safe state;The output flow rate of the valve is related to the input command electrical signal and the pressure drop at the throttle of the valve. For a given valve
pressure drop, the output flow rate of the valve can be calculated by the following equationWorking Principle
The servo achieves closed-loop control of the spool position by means of a built-in LVDT position sensor, a linear force motor and a built-in
amplifier. When the servo valve is energized with a control signal corresponding to the desired spool position, the built-in amplifier converts
it into a corresponding pulse width modulated signal (PWM) to drive the linear force motor. Under the excitation of the oscillator, the LVDT
position sensor fixed to the spool generates an electrical signal proportional to the spool position, which is demodulated and compared with
the input command signal. The spool position is proportional to the command signal.Structure :
The valve consists of the following parts.
Permanent magnetic linear force motor: centering
spring (5), force motor assembly (6)
Power stage: spool (3), sleeve (4), etc.
Working Principle
The working principle of permanent magnet linear force motor:
The linear force motor used in the RT6313E valve is a permanent magnet type differential motor (6). The permanent magnets provide some of the
magnetic force for the force motor actuator, so the force motor requires less excitation current than the proportional solenoid. When the coil is not
energized, the armature of the linear force motor is balanced in the neutral position by the magnetic field force in the left and right directions and the
spring force in the center. When the coil is energized, the force on the armature is proportional to the displacement and the current of the coil.
The motor pushrod must overcome the large stiffness of the center spring force, the hydraulic force, and the friction caused by contaminants to
drive the spool movement. The other solution is to work with the combination of proportional solenoid and reset spring, when the electromagnetic
proportional solenoid to achieve the above two-way drive function requires two coils, but this will reduce the dynamic performance of the valve.
Another option is to work with a combination of a proportional solenoid and a reset spring. When the solenoid is de-energized, the poppet will push
the spool to reset and will experience a full open position of the valve, which may result in loss of load control.
Product Description
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Service Hotline：
+86 400 997 5058
Telephone：+86-21-54832120
Address：3229 Jindu Road, Minhang District, Shanghai
WeChat ID：RADK-TECH
Email： info@radk-tech.com
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