Solenoid Valve Type S4A

2024-10-08 by Cherry

Application of S4A solenoid valve in die 

casting machine

Introduction

The die-casting machine is widely used in manufacturing

industry as an important metal forming equipment. 

It obtains high-precision and high-quality castings 

by quickly injecting molten metal into the mold cavity

under high pressure.

During the operation of the die-casting machine, various

control components play a vital role. Among them, the 

solenoid valve, as a key component in controlling the on-off

and flow direction of fluid directly impacts the performance

and working efficiency of the die-casting machine.

The S4A solenoid valve has gradually attracted attention and 

application in the field of die-casting machines with its

unique performance and advantages. As one of the core 

components, the S4A solenoid valve plays an important 

control role.

This article will deeply explore the specific application

of S4A solenoid valve in die casting machine to help users

quickly understand its working principle, functional advantages

and its improvement of production efficiency and quality.

Relationship between die casting machine and solenoid 

valve

A die-casting machine is a kind of equipment used to inject

molten metal into the mold and quickly cool it to form. 

It is widely used in automobiles, electronics, home appliances,

and other fields. As a key control element in the die-casting 

machine, the solenoid valve is responsible for regulating 

the oil circuit of the hydraulic system. The flow of 

liquid can be precisely controlled through the 

opening and closing of the electromagnetic coil.

The S4A solenoid valve is specially designed for the 

die-casting process and has the characteristics of a fast

response speed and high reliability. It can accurately

control the flow of hydraulic oil inside the die-casting

machine, ensuring that every action - whether it is 

mold closing, injection, or ejection - can be completed 

in the shortest time, greatly improving production efficiency.

Overview of die-casting machine

1. Working principle

The working principle of the die-casting machine mainly 

includes several steps such as mold closing, injection, 

pressure holding, cooling, and mold opening. First, the 

mold is closed under the action of the mold closing 

mechanism to form a closed cavity. 

Then, the molten metal liquid is injected into the 

injection system and is quickly injected into the mold 

cavity under high pressure through the push of the piston.

After the metal liquid fills the cavity, it enters the

pressure-holding stage to ensure the density and quality 

of the casting. Then, the mold is cooled to solidify the 

casting. Finally, the mold opening mechanism opens the 

mold and takes out the casting. 

The whole process requires precise control and coordination 

and the various systems work closely together, and the

solenoid valve plays an important control role in it.

2. Demand for solenoid valves

Due to the harsh working environment of the die-casting 

machine, high working pressure, large temperature changes, 

and extremely high control accuracy requirements, strict 

requirements are placed on the solenoid valves used. 

First, the solenoid valve needs to have good sealing 

performance to prevent hydraulic oil leakage and ensure

the stability of the system pressure. Secondly, it must

have a fast response speed and be able to control the 

on-off and flow direction of the fluid in a timely and 

accurate manner to meet the needs of the die-casting machine

for rapid action. 

Furthermore, it is necessary to have high-pressure resistance

and reliability, be able to operate stably under long-term

high-pressure working conditions, and reduce the probability

of failure. In addition, it should also have good anti-pollution

ability to adapt to impurities and pollutants that may 

exist during the working process of the die-casting machine.

Working principle of S4A type solenoid valve

The working principle of the solenoid valve is simply to 

drive the valve core to move through the electromagnetic 

force generated by the electromagnetic coil, thereby changing

the on-off state of the oil circuit. 

The S4A-type solenoid valve adopts electronic control technology, 

which can achieve rapid opening and closing actions in a very

short time, ensuring that the pressure and flow in the hydraulic

system is accurately adjusted.

In die-casting machines, S4A solenoid valves are usually 

used in the following key steps:

1. Mold closing control: When the die-casting machine starts

to close the mold, the solenoid valve controls the flow 

of hydraulic oil to close the mold quickly and accurately, 

ensuring the subsequent injection process goes smoothly.

2. Injection control: When the molten metal is injected into

the mold, the S4A solenoid valve controls the release of 

hydraulic pressure so that the molten metal fills the mold

at a suitable speed and pressure, thereby ensuring the 

quality of the finished product.

3. Ejection and cooling: After the finished product is 

cooled, the solenoid valve controls the hydraulic system 

to perform ejection operations, so that the finished product

can be smoothly de-molded from the mold and ready to enter 

the next production cycle.

Features and advantages of S4A solenoid valve

1. Structural design

S4A solenoid valve adopts advanced design concepts, and 

its structure is compact and reasonable. The valve body 

is usually made of high-strength metal materials with good

pressure resistance and corrosion resistance. The internal

valve core is finely designed and adopts a special sealing

structure to ensure reliable sealing under high pressure.

At the same time, the electromagnetic part of the solenoid 

valve adopts high-quality electromagnetic materials and 

winding technology, which improves the conversion efficiency 

of electromagnetic force and makes the valve core move faster

and more accurately.

2. Performance parameters

2.1 Working pressure range: S4A type solenoid valve can 

adapt to a wide working pressure range, generally can 

work normally between 0 - [X] MPa, and meet the pressure

requirements of different working stages of the die-casting 

machine. In the high-pressure injection stage, it can 

withstand higher pressure to ensure the rapid injection of 

molten metal; and in the low-pressure control stage, it 

can also accurately control the pressure to ensure the stability

of the system.

2.2 Response time: Its response time is extremely short, 

usually between a few milliseconds and tens of milliseconds.

This enables it to quickly respond to the signal of the 

control system, control the on and off of the fluid in time,

meet the needs of the die-casting machine for rapid action, 

and improve the working efficiency and production rhythm of 

the die-casting machine.

2.3 Flow characteristics: It has good flow characteristics and 

can provide appropriate flow according to different working 

requirements. Through precise valve core design and flow 

channel optimization, it ensures that the pressure loss 

of the fluid when passing through the solenoid valve is 

small and the flow is stable, thereby ensuring the normal 

operation of each system of the die-casting machine.

2.4 Durability: The use of high-quality materials and 

advanced manufacturing processes make the S4A-type 

solenoid valves have a long service life. Under normal 

use conditions, its working life can reach hundreds of 

thousands of times or even higher, reducing the maintenance

cost and downtime of the equipment.

3. Other advantages

3.1 Easy installation: The structural design of the 

S4A-type solenoid valve takes into account the convenience

of installation. Its interface form and size meet 

industry standards and can be quickly connected to the

pipeline system of the die-casting machine, reducing 

installation time and workload.

3.2 Simple maintenance: The solenoid valve has good 

maintainability. In the event of a fault, its structure 

is easy to disassemble and repair, and maintenance personnel 

can quickly replace damaged parts and restore the normal 

operation of the solenoid valve. At the same time, its 

common fault types are relatively few and easy to diagnose, 

reducing the difficulty of maintenance.

3.3 Strong compatibility: The S4A-type solenoid valve is 

compatible with a variety of control systems, whether it is

traditional relay control or modern PLC control, it can 

work well with it to achieve precise control of the die-casting

machine. This makes it have a wide range of application 

prospects on different types and models of die-casting 

machines.

3.4 Fast response: The S4A solenoid valve has a fast response

speed and can complete the action in a very short time, 

which is particularly important for die-casting processes 

that require high efficiency and rapid prototyping.

3.5 High-precision control: Thanks to the precise adjustment

of the electronic control system, the S4A solenoid valve

can achieve precise control of the pressure of the 

hydraulic system, ensuring the accuracy of each die-casting 

step.

3.6 High temperature and high-pressure resistance: The 

die-casting process usually involves high-temperature 

and high-pressure environments. The S4A solenoid valve 

is made of high-temperature resistant materials to ensure

that it can operate stably under extreme conditions.

3.7 Strong durability: The design and material selection 

of the S4A solenoid valve ensure that it has a long service

life and reduces the need for frequent maintenance and 

replacement.

Application of S4A solenoid valve in die-casting 

machine

1. Application in hydraulic system

1.1 Injection control

In the injection system of the die-casting machine, 

the S4A solenoid valve plays a key control role. It controls

the flow direction and pressure of the hydraulic oil 

to achieve rapid advancement and return of the injection

 piston. During the injection process, the solenoid valve

opens quickly according to the instructions of the 

control system, allowing high-pressure hydraulic oil to 

enter the injection cylinder and push the piston to inject

the metal liquid into the mold cavity. After the injection

is completed, the solenoid valve closes quickly and switches

the oil circuit at the same time to reflux the hydraulic 

oil in the injection cylinder and return the piston. 

Due to the rapid response and precise control capabilities

of the S4A type solenoid valve, the speed and pressure 

of the injection process can be ensured to be stable, 

thereby ensuring the quality and dimensional accuracy 

of the casting.

1.2 Mold closing and mold opening control

Mold closing and mold opening are important steps in the 

working cycle of the die-casting machine, and the S4A-type

solenoid valve also plays an important role in these two

processes. When closing the mold, the solenoid valve 

controls the oil inlet and return of the mold closing 

cylinder to achieve smooth closing of the mold and provide

sufficient mold closing force to ensure that the mold 

will not leak during the injection process. 

When opening the mold, the solenoid valve controls the oil

circuit in the opposite order to open the mold smoothly.

By accurately adjusting the opening of the solenoid valve 

and controlling the flow of hydraulic oil, the speed of mold

closing and mold opening can be optimized, and the working

efficiency of the die-casting machine can be improved.

1.3 Pressure holding control

The pressure-holding stage is crucial to the quality of 

castings. The S4A solenoid valve can accurately control 

the pressure of the pressure holding system. During the 

pressure-holding process, the solenoid valve adjusts the 

flow of hydraulic oil promptly according to the preset 

pressure value to keep the pressure in the mold stable. 

It has good sealing performance and precise pressure control 

ability to effectively prevent the occurrence of shrinkage 

holes, looseness, and other defects in the casting during

the cooling process, and improve the density and mechanical

properties of the casting.

2. Application in control systems

2.1 Signal transmission and conversion

As a bridge between the control system and the actuator,

the S4A solenoid valve can accurately receive the electrical 

signal sent by the control system and converted into a 

hydraulic signal to control each action of the die-casting 

machine. 

The communication interface between it and the control 

system is reasonably designed and can transmit 

signals quickly and accurately, ensuring the real-time 

monitoring and precise control of the die-casting machine

by the control system. At the same time, the solenoid valve

can also transmit the feedback signal of the actuator to 

the control system, so that the operator can understand the 

working status of the die-casting machine in time to make 

corresponding adjustments.

2.2 Automatic control

In modern die-casting machines, the degree of automation 

is getting higher and higher, and the S4A solenoid valve 

plays an important role in automatic control. By cooperating

with automatic control systems such as PLC, it can realize

the automatic control of the working cycle of the die-casting

machine. For example, according to the preset program, a 

series of actions such as mold closing, injection, pressure 

holding, cooling, and mold opening are automatically completed,

and the parameters of each action can be adjusted and 

optimized according to different casting process requirements.

This not only improves the production efficiency of the 

die-casting machine and the stability of product quality, 

but also reduces the labor intensity of operators.

Practical application case of S4A solenoid valve

In the die-casting process of certain automobile parts 

manufacturers, the S4A solenoid valve successfully increased 

the production efficiency by 20%. The manufacturer mainly 

produces automobile engine parts. The die-casting machine 

works 24 hours a day, and the S4A solenoid valve always 

maintains stable operation, with almost no failures, which 

greatly reduces the time and cost of downtime maintenance.

Another application case comes from an electronic product 

housing manufacturing company. 

After the company introduced the S4A solenoid valve, 

it not only shortened the production cycle but also 

effectively reduced the defect rate of finished products.

The qualified rate of finished products increased from

the original 85% to more than 95%.

Application Effects and Advantages

1. Improve production efficiency

1.1 Fast response: The fast response speed of the S4A 

solenoid valve enables the various actions of the die-casting

machine to be completed more quickly, shortening the 

working cycle. For example, during the injection process, 

the fast solenoid valve response can reduce the filling 

time of the molten metal and improve the production cycle.

1.2 Precise control: Its precise flow and pressure control 

capabilities ensure that the die-casting machine can operate 

according to the optimal parameters at each working stage,

avoiding scrap and rework caused by inaccurate control, 

thereby improving the overall production efficiency of the 

equipment.

2. Improve product quality

2.1 Stable pressure: In the pressure-holding stage, the 

S4A solenoid valve can maintain a stable pressure, effectively 

preventing defects such as shrinkage and looseness inside 

the casting, and improving the density and mechanical 

properties of the casting. At the same time, precise 

injection control also ensures the dimensional accuracy 

and surface quality of the castings.

2.2 Process consistency: Since the solenoid valve can 

accurately control according to the preset process parameters,

the production process of each casting is highly consistent, 

thus ensuring the stability and reliability of product quality.

3. Reduce energy consumption and cost

3.1 Energy saving effect: The good sealing performance and 

precise flow control of the S4A solenoid valve reduce the 

energy loss in the hydraulic system. When high pressure is 

not required, the pressure can be adjusted in time to avoid

energy waste. At the same time, its long life and low 

failure rate also reduce the maintenance cost of the equipment

and the cost of replacing parts.

3.2 Reduce scrap rate: By improving product quality, the 

waste of raw materials and production costs caused by scrap 

are reduced. Accurate control improves the qualified rate of 

castings, thereby reducing the overall production cost.

Problems and solutions that may be encountered in the 

application

1. Solenoid valve failure

1.1 Valve core stuck: It may be due to impurities in the 

hydraulic oil entering the solenoid valve, resulting in 

poor movement of the valve core. The solution is to filter

and clean the hydraulic oil regularly to ensure the 

cleanliness of the oil. At the same time, when installing

the solenoid valve, be careful to avoid impurities 

entering the valve body.

1.2 Damage to the electromagnetic coil: The reason may 

be overvoltage, overcurrent, or long-term operation causing

the coil to heat up and burn. During use, the power supply 

voltage should be ensured to be stable to avoid overload 

operation. If the electromagnetic coil is found to be damaged, 

it should be replaced in time.

1.3 Seal leakage: Aging, wear, or improper installation of 

seals may cause leakage. For aging and wear of seals, they 

should be checked regularly and replaced in time. When 

installing seals, strictly follow the operating procedures 

to ensure correct installation.

2. Hydraulic system problems

2.1 Pressure fluctuations: It may be caused by hydraulic

pump failure, improper adjustment of the overflow valve,

or air in the system. For hydraulic pump failure, it should

be repaired or replaced in time. Improper adjustment of 

the overflow valve requires re-adjustment of its pressure 

setting value. When there is air in the system, the air 

should be discharged through the exhaust device.

2.2 Excessive oil temperature: Excessive oil temperature

will affect the viscosity of the hydraulic oil and the 

performance of the solenoid valve. It may be caused by

poor heat dissipation, excessive hydraulic oil flow, 

or excessive system load. The oil temperature can be reduced 

by adding heat dissipation devices, adjusting hydraulic 

oil flow, or optimizing system load.

3. Control system compatibility issues

When connecting with different control systems, compatibility

issues may occur, resulting in poor signal transmission or

inaccurate control. The solution is to ensure that the 

S4A-type solenoid valve has good compatibility with the 

control system used when selecting. At the same time, for

ome special control systems, appropriate parameter settings

and debugging may be required to achieve the best matching 

effect.

How to choose a suitable solenoid valve

When selecting a solenoid valve, users should make comprehensive 

considerations based on the specific needs and process requirements

of the die-casting machine. First, ensure that the specifications

and the pressure range of the solenoid valve matches the system of

the die-casting machine; second, consider the durability of 

the solenoid valve and choose products that can operate for a 

long time under high temperature and high pressure.

S4A type solenoid valve has become one of the first choices in 

the die-casting industry due to its excellent durability and 

precise control performance.

Future development trend

With the continuous development and progress of die-casting 

machine technology, higher requirements are also placed on the

performance and functions of S4A type solenoid valves. In 

the future, the S4A solenoid valve will develop in the 

following directions:

1. Intelligence

Intelligence is an important trend in the development of 

solenoid valves. The future S4A solenoid valve will have 

more intelligent functions, such as self-diagnosis, fault

warning, remote monitoring and control, etc. Through 

built-in sensors and smart chips, the working status and

performance parameters of the solenoid valve can be 

monitored in real time, and the data can be transmitted

to the control system. Operators can monitor and operate 

the solenoid valve through the remote terminal, discover 

and solve problems in time, and improve the operating 

reliability and management efficiency of the equipment.

2. Miniaturization and integration

To adapt to the increasingly compact design requirements

of die-casting machines, S4A solenoid valves will tend 

to be miniaturized and integrated. By adopting advanced 

manufacturing processes and materials, the volume

and weight of the solenoid valve is reduced, and multiple

functions are integrated into one valve body, which reduces

the pipeline connection and installation space, and improves

the overall reliability and compactness of the system. 

For example, the solenoid valve is integrated with components 

such as filters and check valves to form a multifunctional

hydraulic control module, which is convenient for the installation 

and maintenance.

3. High performance and high reliability

As the die-casting industry continues to increase its 

requirements for product quality and production efficiency, 

higher standards will be set for the performance and 

reliability of S4A solenoid valves. In the future, the 

solenoid valve will further strengthen its reliability 

design while improving performance indicators such as 

working pressure, response speed, and flow accuracy. 

The use of better materials, more advanced manufacturing 

processes, and more stringent quality inspection methods

will ensure that the solenoid valve can operate stably 

for a long time in harsh working environments, reducing 

the probability of failures, and provide strong guarantees

for the efficient production of die-casting machines.

4. Energy saving and environmental protection

Energy saving and environmental protection are the themes

of today's social development, and the die-casting machine

industry is no exception. In the future, the S4A-type 

solenoid valve will pay more attention to the improvement

of energy saving and environmental protection performance.

By optimizing the valve core structure and flow channel

design, the energy loss of the hydraulic system can be

reduced; energy-saving electromagnetic drive technology

can be used to reduce power consumption; at the same 

time, degradable sealing materials will be developed to 

reduce environmental pollution. These measures will help 

the die-casting machine achieves a greener and more

environmentally friendly production.

Conclusion

As an advanced control element, the S4A-type solenoid 

valve has a wide range of application prospects and an 

important role in die-casting machines. It's unique 

structural design, excellent performance characteristics

and multiple advantages enable it to meet the strict 

requirements of die-casting machines for solenoid valves, 

and play a significant role in improving the production 

efficiency of die-casting machines, improving product 

quality, reducing energy consumption and costs.

The application of S4A solenoid valves in die-casting 

machines have greatly improved the automation level and 

production efficiency of die-casting processes. Its fast

response, high-precision control, and high temperature 

and high-pressure resistance make it perform well in

high-demand die-casting environments. For companies 

that want to improve production efficiency and reduce 

equipment failures, choosing S4A solenoid valves are 

undoubtedly a wise move.

However, some problems may be encountered during the 

application process, and we need to take the corresponding

solutions. With the continuous development of technology,

S4A solenoid valves will develop in the direction of 

intelligence, miniaturization, integration, high performance,

high reliability, energy saving, and environmental 

protection, and provide more advanced and reliable support

for the development of the die-casting machine industry.

In the future design and manufacturing of die-casting 

machines, the reasonable selection, and application of 

S4A solenoid valves will help improve the overall performance 

and competitiveness of the equipment and promote the 

continuous progress and development of the die-casting 

industry.

It is hoped that the detailed description of the application

of S4A solenoid valves in die-casting machines in this 

article can provide a useful reference for technicians 

and researchers in related industries, and promote the 

wider application and continuous innovation of S4A solenoid

valves in the field of die-casting machines. At the same 

time, it is also expected that through in-depth research 

and optimization of this technology will bring more 

development opportunities and breakthroughs in die-casting

machine industry and contribute to the high-quality 

development of the manufacturing industry.

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