Overview
This displacement‑electric feedback proportional cartridge valve belongs to two‑way screw‑in logic cartridge valve series, adopting main‑stage seat‑type poppet structure together with built‑in electric displacement transducer for real‑time spool position feedback. Compared with conventional proportional cartridge valves without feedback, it greatly reduces hysteresis and improves control repeatability under varying load conditions. As a core component of hydraulic integrated circuit (HIC), it installs into standard manifold cavity to eliminate external leakage and simplify hydraulic system layout.
Structure
Displacement-electric feedback proportional throttle is a pilot two-way cartridge valve for the stepless closed-loop control of the flow, which is mainly composed of the following
six parts:
1. Control Cover 2. Valve sleeve 3. Spool 4. Pilot valve
5. Proportional solenoid 6. Displacement sensor 7. Spring
Function description
The actual position value of the throttle valve spool (3) is feedback by the displacement sensor (6), and the given value is compared with the actual value in the proportional amplifier, and the generated deviation amount is used as the adjustment change amount input proportional solenoid (5) control the pilot valve (4) movement to correct the position of
throttle valve spool (3).
1.The ratio of the bearing area at both ends of the
main spool
NG 25, 32, 40: 2 : 1 NG 50, 63: 1.6 : 1
2. Flow direction
Flow direction:A→B(X and A are connected) Flow direction:B→A(X and B are connected)
Pilot control oil can be supplied externally via X port
3. Spool covering
When there’s no signal, main spool (3) is in a leakfree closed state under the pressure of X port and spring force, and the throttle is in the position of being covered.
4. Leakage
When the main spool (3) is closed, A←→B has no leakage, but X port leaks through pilot valve to Y port.
5. Valve open
Assume that the flow from A to B, and A is connected to X After the current of proportional solenoid (5) is given,proportional solenoid (5) pushes the spool of pilot control spool (4), and opens the passage of control chamber (7)
and Y port against the spring force, so that the pressure of control chamber (7) is reduced. When the pressure is reduced to a certain extent, the force valve A and valve B are greater than the force at control chamber (7), the throttle valve moves in the opening direction.
6. Valve closed
Assume that the flow from A to B, and A is connected to X Reduce the current of proportional solenoid (5), the spring force of the pilot valve (4) overcomes the electromagnetic force to push the spool of the pilot control spool (4), open the passage of the control chamber (7) and the X port, and make the pressure of control chamber (7) increases. When the force is increased to certain extent, the force of control chamber (7) is greater than A port and B port, the throttle valve spool is moving in closing direction.
Features
● Installation dimensions in accordance with ISO 7368 and GB/T 2877
● Pilot control
● Throttle spool with displacement sensor
● Suitable for one-way and two-way flow control
● Zero leak when closed
● The amplifier is a digital amplifier for easy adjustment of parameters
● Pressure compensator can be connected to achieve pressure compensation flow control
Company Profile
Shandong Taifeng Intelligent Control Co., Ltd. is expanding its footprint in the global hydraulic market. While our roots are in serving China‘s industrial backbone, our high-quality cartridge valves, multi-way valves, and hydraulic pumps are increasingly sought after by international OEMs seeking reliable, cost-effective fluid power solutions. We are committed to providing responsive technical support and export-ready packaging to partners worldwide, helping you reduce lead times and improve equipment performance .
