D634-1028
D634-1028 belongs to single stage direct drive servo valve series. It adopts integrated 24VDC electronic module and LVDT closed-loop spool position feedback structure. Driven by permanent magnet linear force motor, the valve needs no pilot oil supply and delivers stable working performance. This four-way spring centered valve will reset spool to neutral position automatically once power failure occurs. This version features ultra high flow capacity and suits working conditions that prioritize flow volume over rapid dynamic response. It is commonly used in heavy-duty hydraulic press and conventional industrial motion control systems.
Description
General Description
D634-1028 belongs to single stage direct drive servo valve series. It adopts integrated 24VDC electronic module and LVDT closed-loop spool position feedback structure. Driven by permanent magnet linear force motor, the valve needs no pilot oil supply and delivers stable working performance. This four-way spring centered valve will reset spool to neutral position automatically once power failure occurs. This version features ultra high flow capacity and suits working conditions that prioritize flow volume over rapid dynamic response. It is commonly used in heavy-duty hydraulic press and conventional industrial motion control systems.
Hydraulic Specifications
The maximum operating pressure of pressure port and working ports reaches 350 bar. The return port bears 50 bar pressure without external drain port, and can withstand 350 bar pressure with drain port connected. Rated flow ranges from 120 to 130 liters per minute under 35 bar pressure difference, and the maximum flow capacity can reach 240 liters per minute. Internal leakage is limited within 0.80 liters per minute.
The applicable working fluid is mineral hydraulic oil complying with ISO 11158 and DIN 51524 standards. Fluid working temperature varies from minus 20 degrees Celsius to 80 degrees Celsius. It is suggested to maintain system oil cleanliness at ISO 4406 17/14/11 grade to extend service lifespan.
Performance Characteristics
The typical full stroke step response time is 24 to 26 milliseconds. Negative 3dB frequency response ranges from 55 to 65 hertz. Hysteresis value is less than 0.60 percent full scale, and positioning resolution is better than 0.20 percent full scale. Null position drift stays below 1.5 percent full scale under 60 Kelvin temperature fluctuation. Position repeatability is controlled within 0.35 percent full scale.
Electrical Specifications
Nominal power supply voltage is 24 volt direct current, with acceptable voltage range from 18 to 32 volt direct current. Maximum working current is 3.3 ampere. Users can switch among ±10 volt, ±10 milliampere and 4 to 20 milliampere control signals via internal jumper. The valve outputs standard 0 to 10 volt spool position feedback signal.
Equipped with M18 connector including six signal pins and protective earth terminal, the product owns IP65 protection grade. Ambient applicable temperature covers minus 20 degrees Celsius to 60 degrees Celsius. All electronic components meet CE electromagnetic compatibility requirements.
Working Principle
LVDT sensor detects real-time spool displacement and sends feedback signal to internal circuit. The electronic unit compares practical position data with given command signal, then outputs driving signal to linear force motor. The motor drives spool movement to adjust flow rate and flow direction, realizing accurate hydraulic motion control. Spring structure guarantees safe reset and shutdown when power cuts off.
Installation Instructions
Install the valve on smooth and clean mounting surface according to standard hole position. Fasten fixing bolts with proper torque and avoid collision and installation deviation. Horizontal installation mode is recommended for better air exhausting effect. Drain all residual air inside valve body and pipelines before formal operation.
Wiring Definition
Pin 1 connects positive 24VDC power, pin 2 connects power ground. Pin 3 and pin 4 are positive and negative terminals of control signal. Pin 5 outputs spool position feedback signal, pin 6 connects feedback ground wire. The protective earth terminal shall be grounded reliably. Shielded twisted pair cable is required for signal connection.
Maintenance Notes
This valve is designed as sealed integral structure without detachable internal parts. Regularly check oil pollution status and replace filter elements timely to keep qualified fluid cleanliness. Examine external connector periodically to prevent damage and corrosion. Disassembling the valve without authorization is forbidden, and such behavior will void product warranty.
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