Common malfunction and troubleshooting of rexroth hydraulic valves

1.Rexroth hydraulic valve is not working:

Check the power supply wiring is connected to the adverse or not → Rewiring and connectors;

Check whether the power supply voltage is within the scope of the work or not → Transfer to normal range;

Check whether the coil is connected or not → Re welding;

Coil short circuit → Replacement coil;

Whether the working pressure difference of inlet metering pump is appropriate or not →Adjust the pressure difference or replace the appropriate rexroth hydraulic valves;

Fluid temperature is too high → Replace the appropriate rexroth hydraulic valves;

There are impurities make the main valve core and the valve core card stucked → For cleaning, if there is a seal damage should be replaced the seal and installed filter;

The liquid viscosity is too large, the frequency is too high and the life has been reached → Replace products.

2.Rexroth hydraulic valves can not be closed:

The main spool or the seal of the moving iron core has been damaged → Replace seal;

Fluid temperature, viscosity is too high → Replacement of rexroth hydraulic valves;

There are impurities into the solenoid valve spool or moving iron core →Wash;

Spring deformation or service life has been reached → Replace spring;

Throttle hole balance hole plug → Timely cleaning;

Working frequency is too high → Replace products or updates.

3.Other conditions:

Internal leakage → Check seal for damage → Whether the spring assembly or not;

External leakage → The connection is loose or the seal is broken → Tighten the screw or replace the seal;

When power is a noise → The head fasteners loose, tighten;

Voltage fluctuations are not allowed within the range → Adjust the voltage;

Core pull impurities or uneven surfaces → Timely cleaning or replacement.

Classification of solenoid directional valve

Variety of 4we4-60 bosch hydraulic valves, according to the number of its working position and the number of channels can be divided into two position three way, two position four way, three position four way and so on; according to its reduction and positioning can be divided into the form of the spring, steel ball positioning, no reset spring type; according to the connecting form of the body and the electromagnet can be divided into flange connection and screw connection; according to the structure of the distribution of its power can be divided into dry and wet type, each type has AC, DC, the whole and other forms, and there are many kinds of power supply voltage, so there are many differences in its structure.

1.Classified by the number of interfaces and the number of switches.Interface refers to a variety of connection which tubing into and exit connecting line on the bosch hydraulic valves, the oil inlet is usually labeled as P, the oil return port is R or T, and the oil outlet is represented by B and A. Rexroth directional control valve core can be moved by the number of positions known as the number of the switch position, usually we will be called “pass”, the position of the rexroth directional valve core is called “position”. Therefore, according to the number of its working position and the number of the number of channels can be divided into two position three way, two position four way, three position four way and so on.
2.Classification by operation.To promote the rexroth directional control valve movement of the hand, foot, mechanical, hydraulic, electromagnetic and other methods.
3.Classification according to its reduction and positioningIt can be divided into the spring type, steel ball positioning, no reset spring type.
4.Classification by structure of electromagnetCan be divided into dry and wet type.

Installation and maintenance of solenoid valve

Miniature hydraulic valves is one of the valves used in the automatic control system, it gets the user’s consistent favor because of low price, simple operation, convenient and reliable(it can directly accept the PLC or DCS switch quantity control signal). We will simply explain what you need to pay attention to while the installation and the maintenance of ng3 valve below.
Installation notes:
1.First check if the miniature hydraulic valves is consistent with the selection parameters, such as power supply voltage, medium pressure, pressure, etc.. Especially the power, if wrong, it will burn out coil. Power supply voltage should meet the voltage range of voltage fluctuation range: AC +10%~-15%, DC +10%~-10%, usually the coil assembly is not open.
2.To flush the pipes before taking over, remove metal powder, seal material, rust and dirt in the pipe. Need to pay attention to the medium cleanliness, if the medium mixed with dirt and impurities that impede the normal work of the ng3 valve, the filter or strainer should be installed in the pipeline.
3.miniature hydraulic valves solenoid coil components should be installed vertically in the horizontal pipe. If you are subject to space constraints or other conditions have to installed it on the side, need to be put forward in order.Otherwise it may cause the solenoid valve does not work.
4.Manual shutoff valve should be added before and after the ng3 valve,and should be set to bypass, easy maintenance.
5.Hydraulic directional valve is generally oriented, cannot be reversed. Usually mark on the valve body with an arrow indicating the direction of the flow of the media, it should be installed in accordance with the direction of the arrow. But in the vacuum line or special circumstances can be reversed.
6.If the medium caused a water hammer effect, then you should use the miniature hydraulic valves with prevent water hammer effect function or take corresponding preventive measures.
7.Don’t let the ng3 valve is energized for a long time, it is easy to reduce the service life of the coil and even burn the coil.
8.The inlet side of the steam hydraulic directional valve shall be provided with a steam trap, which shall be inclined to take over.

About BSTIND

#BSTIND,as known as Ningbo Best Industrial Co.,Ltd is professional in designing and manufacturing,sales of #HydraulicValve. #Factory With more than 20000 square meters workshops.And there are about 300 workers and 50 among which are senior or intermediate technical engineers. BSTIND had passed #ISO9001:2008 and #CEcertificates.Annual production is selling about 0.6 millions hydraulic valves.
Main products including: Hydraulic Directional Valves,Manual Hydraulic Valve,Modular Valve,Pressure Release Valve,Cartridge Solenoid Valve,Cartridge Relief Valve,Cartridge Check Valve, Counterbalance Valve,Flow Control Valve,Log Splitter Valve,Manifold Block and so on.
Production line have dozen of #CNC centers,CNC lathe,internal-grinder machines,external-grinder machines,CNC quilting mill,dozen of testing machine and other production advanced machines, design and engineering facility include Solid-works, ProE and Auto-CAD.
BSTIND had applied the PPAP Product Control of TS 16949 Standard, and products are 100% qualified before delivery. All the standard products must tested for millions of times before leave factory.
BSTIND pay attention to every detail of products and service,make sure products with zero defects, In order to win good reputation of customers around the world, BSTIND Always Optimization Products and services.At the same time,expanding market share to support distributors with more value-added services and get more trust from the end user.
BSTIND will always provide high quality products, good service, reasonable prices from now on.BSTIND Forward with you Hand in hand and along with the progress in the world.