Fault solution for leakage of electromagnetic 3 position 4 way directional control valve

Modular controls solenoid valve due to the material, processing accuracy, the use of wear and other reasons, there may be an abnormal increase in internal and external leakage, resulting in a decrease in pressure, or through the flow problem and other issues.

The leakage of electromagnetic modular controls solenoid valve leakage is increased, the most common problem for the O type sealing ring. Should check whether the O ring is installed in place, if there is a squeeze, damage and other issues, it is best to replace the sealing ring.

Also need to check the size of the sealing ring, and whether it is consistent with the size of the sealing surface, O type of ring is too large or too small will affect the sealing effect.

Secondly, O type ring material hardness in high pressure situation will also affect the stability of the seal, the lower hardness of the O ring is not suitable for solenoid operated relief valve seal, should choose high hardness O type ring to get better sealing effect.

The internal leakage of the electromagnetic 3 position 4 way directional control valve is increased, which causes the system pressure to reduce, the flow loss, and the work efficiency of the hydraulic system. Common cause of this failure is solenoid operated pressure relief valve body hole and spool wear in the long-term movement of the process of friction,lead to excessive solenoid operated relief valve clearance, causing leakage. Can repair the outer diameter of the spool, or replace the valve core.The material hardness of valve core and valve body directly determines its service life.

Main advantages of electromagnetic directional control valve

1.Security

Internal and external leakage is a risk factor for safety. Other automatic directional control YUKEN DSHG 06 valve will generally stem, control directional valve to rotate or move by electric, pneumatic or hydraulic actuator. This is to solve the stem seal leakage problem of long-term operation of the rexroth directional valve.

A.Internal leakage. Electric directional control dshg 06 yuken valve torque is not easy to control, prone to internal leakage, and even pull off the stem head; the electromagnetic directional valve leakage within the structure type is easy to control, until reduced to zero.

B.External leakage. Solenoid directional dshg 06 yuken valve is completed by the electromagnetic force acting on the magnetic core in the magnetic seal, there is no dynamic seal, so it is easy to plug the leakage.

In summary, the use of special safety valve, particularly suitable for corrosive, toxic or high temperature media.

2.Cost performance

A.Solenoid directional control YUKEN DSHG 06 valve itself is simple and low price, and is easy to install and maintain than other types of directional control valves .

B.The composition of the automatic control system is much simpler, and the price is much lower.

C.As the solenoid directional dshg 06 yuken valve is a switch signal control, and industrial computer connection is very convenient.

3.Energy saving

A.Solenoid directional control YUKEN DSHG 06 valve response time can be as short as a few milliseconds, even if the pilot solenoid directional valve can be controlled within a few tens of milliseconds.As a result of the loop, it is more sensitive than the other control valve.The power consumption of properly designed solenoid directional valve coil is very low.

B.Also can be done only to trigger the action, automatically maintain valve position, usually do not consume power. Solenoid directional control dshg 06 yuken valve small size, space saving, but also light and beautiful.

The purchase method of electromagnetic reversing control valve

1.WEHD rexroth hydraulic solenoid valve used to control the electric hydraulic control valve spool movement with electromagnet, and the structure and type of electric hydraulic control valve can be a variety of, such as two position two way, two position three way, two position four way, three position four way and three position five way types. In general, two position control valve with an electromagnet, three position valve with two electromagnets.

2.The electromagnet which control electric hydraulic control valve is divided into AC and DC two kinds, AC solenoid voltage is generally 220 volts. Its characteristic is the big start the power, short commutation time and low price. But when the spool jammed suction or not enough to absorb the core, the electromagnet is easy to burn out because the current is too large , therefore, the work reliability is poor, impact when action, life is lower. DC solenoid voltage is generally 24 volts. The utility model has the advantages of reliable work, will not burn because of spool jammed, long life and small size, But the starting power is less than the AC solenoid, and need rectifier equipment in the absence of DC power.

3.According to the structure of the electromagnet can be divided into dry type and wet type, each type has AC, DC and the entire form. And there are many kinds of power supply voltage, so there are a lot of differences in the structure. Because the internal wet electromagnet is connected with the back oil chamber, can reduce the wear when the armature moving in the oil,and improve thermal performance and the service life. AC electromagnet has the advantages of short operation time, simple electrical control line, no special contact protection. DC electromagnet is characterized by soft switching characteristics, high frequency operation, not sensitive to the overload or low voltage response, stable and reliable. In recent years, the domestic and international is increasingly wide use of wet electromagnet. The WEHD rexroth hydraulic solenoid valve push rod without sealing, eliminates the friction of O ring. It directly use the engineering plastic seal outside electromagnetic coil, do not have to do the metal shell, this not only ensures the insulation, but also conducive to heat, so the work is reliable, the impact is small, long life.

Several types of direction control valves

1.Manual reversing yuken dsg-01 direction control valves:manual valve is use of the manual lever to change the spool position to achieve the reverse.

2.Motorized reversing direction control dsg-01-3c2 valves: also known as stroke valve, it is mainly used to control the movement of hydraulic machinery parts, which is the use of a block on the working table or cam to force thespool to move, so as to control the flow direction of oil. Motor reversing yuken dsg-01 valve is usually two position, there are two way, three way, four way and five way of two position directional control dsg-01-3c60 valve.Two position two way and two position three way directional control valve divided into common open and common closed.

3.Solenoid direction control dsg-01-3c2 valve: using the power of the electromagnet(on/off) to directly promote the valve core to control the oil port connected state.

4.Hydraulic reversing directional control dsg-01-2b2 valve

5.Electro hydraulic reversing valve: by the combination of electromagnetic valve and hydraulic directional control dsg-01-3c60 valve. Solenoid direction control valves play a leading role, it can change the direction of the flow, so as to change the position of the hydraulic directional control valve. Because of the hydraulic pressure of the hydraulic directional control valve can be very large, so the main valve can be great, allowing a greater flow through. Such a small electromagnet can be used to control large liquid flow.

6.Proportional solenoid direction control dsg-01-2b2 valve: the proportional direction control valves control the movement of the valve core with the electromagnetic force generated by the electromagnetic coil of the valve core, control the direction of the valve spool displacement by controlling the coil current, so that it can control the direction and flow of oil flow.

Matching problem of solenoid hydraulic valves power supply

Some time ago, a client of mine encountered a problem that hydraulic YUKEN DSG-03 solenoid valve can not be opened.24V power supply to 9 solenoid valves by switching power supply,use collinear supply power to 9 solenoid hydraulic valves at the same time,and control signal to control the action of an hydraulic dsg solenoid valve.But why do often solenoid hydraulic valves can not move? What is the reason?

Through the specific communication, we learned that customer use the 1.5 party line length of 230 meters, so it is not difficult to understand why the solenoid hydraulic valve does not move.Because the power supply voltage selection of 24V, we need to consider the loss, if the cable is too thin and too much, loss will be too large. When the power supply to the YUKEN DSG-03 solenoid valve coil, the voltage is only 16V, has been lower than the normal open voltage of 20V, leading to the solenoid valve coil can not act. There are 9 solenoid hydraulic valve at the same time, so that the terminal voltage and power must be guaranteed to the solenoid hydraulic valves.

How to measure the life of solenoid valves

The following 4 situations will hinder the normal work and shorten the life of the dg4v5 vickers valve :

1,The use of medium changes in the process.

2.Internal pipe rust.

3.Air compressor oil oxidation, resulting in carbon particles of tar and other debris mixed into the pipeline.

4.The dirt dust and other impurities in the pipeline.

Technical performance and specifications:

1.DG4V5 vickers valve in the 12bar constant pressure (can be set), on the highest 90 degrees Celsius hot water.

By requirements of different types of dg4v-5 hydraulic valve (such as 5S/5s for a time) for testing, the number of consecutive trials in 50000 times or so (can be set).

2.Test bench can automatically record the water valve coil through the case, can record the stop time on the middle of the failure of the water valve, but does not affect the work of other dg4v5 vickers valve.

3.Test rig can simultaneously detect 10 water valve.

4.The accuracy of pressure control is ±0.2 bar, the temperature control precision is ±1℃.

5.Solenoid dg4v5 vickers valves voltage is adjustable (12~300V)

6.Can be used as a test of low voltage pass performance.

Working principle of electro hydraulic control valves

Electro hydraulic reversing valve and hydraulic control valves are used in the hydraulic system which the flow over the normal operation of the solenoid hydraulic control valves to control the movement of the actuator or control the flow direction of the oil.

Notice of the electro yuken hydraulic valves

1.Products can be arbitrarily installed, priority level position.

2.The hydraulic system must be filtered by the media, filtration accuracy at least 20μm.

3.Fixed screw selection according to the parameters listed in the sample.

4.The roughness of the surface of the hydraulic control valve is required to Ra0.8, and the flatness is required for 0.01/100mm.

Working principle

When the two yuken hydraulic valves coil through the power, the balance hole circuit is closed, the discharge hole circuit is opened, the piston pressure relief, the piston upward, the valve opens. On the contrary, the piston down, the valve closes. In the yuken hydraulic solenoid valve opening and closing process, the flow rate signal and valve plug position signal is transmitted to the computer, after the computer processing to send out the corresponding command, control power down state of the two solenoid hydraulic control valves, so that the piston of the upper chamber of the hydraulic pressure difference, so that the piston control in the required opening height, to achieve the pipeline medium flow control.