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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RT4WRA
Maximum Working Pressure: 315bar
Maximum Flow Rate: 42L/min (Nominal Diameter 6)
Maximum Flow Rate: 75L/min (Nominal Diameter 10)
- Product Description
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Function Description
RT4WRA、RT4WRAE
The 4/2- and 4/3-way proportional directional valves are designed as direct operated components for subplate mounting. They are actuated
by means of proportional solenoids with central thread and removable coil. The solenoids are controlled either by external control electronics
(type RT4WRA) or by integrated control electronics (type RT4WRAE).Design:
The valves basically consist of:
Housing (1) with mounting surface
Control spool (2) with compression spring (3 and 4)
Solenoid (5 and 6) with central thread
Optional integrated electronics (7)Function:
With the solenoids (5 and 6) de-energized, the control spool (2) is held in
the central position by compression spring {3 and 4)
Direct actuation of the control spool (2)) by energizing a proportional
solenoid
E.g. energization of solenoid "b" (6)
➔ The control spool (2) is moved to the left in proportion to the electrical
input signal
➔ connection from P to A and B to T via orifice-like cross-sections with
progressive flow characteristics
De-energization of the solenoid (6)
The control spool (2) is returned to the central position by compression
spring(3)Valve with 2 spool positions:
(Type RT4WRA ... A ... )
In principle, the function of this valve version corresponds to that
of the valve with 3 spool positions. However, the valves with 2 spoolpositions are only fitted with solenoid "a". Instead of the 2nd proportional solenoid a plug (8.1) is fitted for NS 6 or for NS 10 a cover (8.2).
Note for type RT4WRA 6 ... -2X/ ... :
Draining of the tank line is to be avoided. With the appropriate installation conditions, a back pressure valve is to be installed (back pressure
approx. 2 bar).
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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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