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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RT4WRZ、RT4WRZE
- Product Description
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Function Description
The pilot control valve is a 3-way pressure reducing valve that is actuated by a proportional solenoid. It converts an electrical input signal
into a proportional pressure output signal and is used for all valves of the type RT4WRZ ... and RT4WRZE ...
The proportional solenoids are controllable, wet-pin DC sole- no ids with a central thread and a detachable coil. The sole- noids are controlled
by external electronics (type .WRZ ... ).
RT4WRZ(E) Set-up:
The valve basically consists of:
- Housing (1)
- Control spool (2) with pressure measuring spool (3 and 4) - Solenoids (5 and 6)
with central threads
- Optionally integrated control electronics (7)Function:
- With de-energized solenoids (5, 6), the control spool (2) is held in the central
position by means of the pressure springs (8).
- By energizing a proportional solenoid, e.g. solenoid "a" (5),
➔the pressure measuring spool (3) and with it the control spool (2) are moved
to the right.
➔This opens the connection from P to Band A to T via orifice-type crosssections
with progressive flow characteristic.
- When the solenoid is switched off,
➔the control spool (2) is returned into the central position by the compression
springs (8).
RT4WRZE With de-energized solenoids (3, 4), the main control spool (8) is held in the central position by means of the centering spring (10).
- The main control spool (8) is controlled by the pilot control valve (1); the main control spool is proportionally moved, e.g. by actuating solenoid "b" (3).
➔ The control spool (2) is moved to the right, pilot oil enters the pressure chamber (9) via the pilot control valve (1) and deflects the main control spool (8)
according to the electric input signal.
➔ This opens the connection from P to Band A to T via orifice-type cross-sections with progressive flow characteristic.
- Pilot oil is internally supplied to the pilot control valve via port P or externally via port X.
- Switching the solenoid off (3)
➔ The control spool (2) and main control spool (8) are moved back into the central position.
An optional manual override {5 and 6) can be used to move the control spool (2) without solenoid energization.
Notice: Inadvertent activation of the manual override may result in uncontrollable machine movements.Pilot operated proportional directional valves RT4WRZE ... -7X ...
Valves of type 4WRZ ... are pilot operated 4-way directional valves that are actuated by proportional solenoids. They control the flow
direction and size.
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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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