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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RT6225M（62）
Maximum Working Pressure: 210bar
Rated Flow Rate: 40L/min (measured at △P=70bar)
- Product Description
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Twin flapper-nozzle electrohydraulic servo valve
Features and Benefits
Suitable for closed-loop control of position, force and speed
Frictionless double nozzle-baffle control stage
High dynamic response
High resolution, low hysteresis
Dry torque motor and two stages of hydraulic power amplificationHigh driving force of spool
Strong anti-fouling capability
Plate connection structure
Can be used as a 3-way valve
High reliability and long service lifeThe 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 equationQ— Actual flow，L/min
QN — Rated flow，L/min
Δp — the actual pressure drop of the valve, MPa
△PN — the rated pressure drop of the valve, MPaWorking Principle
RT6225M is a two-stage electro-hydraulic servo valve, mainly used for position, force and speed closed-loop control
Structure：
The valve consists of the following parts
-Pilot stage:
An electro-mechanical converter (torque motor)（1）
One hydraulic amplifier (consisting of nozzle (5), baffle (6))
-Power level:
spool (3), valve sleeve (2) and other components
-The spool is connected to the torque motor through mechanical feedback
Working Principle：
In the torque motor coil (2) input an electrical signal, will produce electromagnetic
force on the armature (3) ends to form an electromagnetic torque, then the
armature deflection drive pipe spring (4) and baffle (6) deflection, baffle deviation
from the middle will reduce the flow of a nozzle (5), and then change the pressure
of the nozzle and the spool (8) side, resulting in pressure difference to push the
spool to move towards the - side. The displacement of the spool opens the oil
circuit between the oil supply port (P port) and a control port (A or B). At the same
time, the displacement of the spool generates a force through the feedback lever
(7) connected with the baffle, forming a return torque to the armature. When the return torque is balanced with the electromagnetic torque, the baffle
returns to the neutral position, and the pressure on both sides of the spool is equal. The spool displacement is proportional to the size of the input
electrical signal, and the load flow rate is proportional to the spool displacement at a constant pressure drop.
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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