Company Profile
Automotive solenoid valves and sensors are our company's featured products. At the same time, our company is also a professional manufacturer specializing in the production of solenoid valve coils and special solenoid valves and other automation supporting components. Most of our products are used in pneumatic, hydraulic and other automation control component industries. At present, our products have been used by many internationally renowned brands and are deeply trusted by our customers.
Why Choose Us
Advanced Equipment
Flying Bull (Ningbo) Electronic Technology Co.,Ltd has an excellent team with more than 20 years of experience in design and development, focusing on the design, development and production of auto solenoid valve and sensor, engineering machinery solenoid valve and sensor.
Rich Experience
The company adheres to the business philosophy of "expert quality, global trust" and the business purpose of "pursuing quality, never ending".
High Quality
Quality is always our Flying Bull's unchanging concept. The company has established a research and development center, measurement room, laboratory, and chemical analysis room, and launches a number of high-tech products every year.
Professional Team
The company has strong R&D capabilities to lay a good foundation for the development and cooperation of new products for customers. First-class talents, advanced equipment, strict quality control system, scientific management, perfect service, and strong R&D capabilities, let us work together to become industry pioneers and win an unlimited future.
The transmission solenoid valve is a type of electromechanical valve that controls the flow of fluid. Specifically, in an automatic transmission, we mean the flow of automatic transmission fluid into and through the transmission. In modern transmissions, the transmission solenoid valve generally comes in a pack which is installed in the transmission control unit, the transmission control module, or a transmission valve body. Transmission fluid is critical to the function of the transmission. If its flow is impeded or hindered, your transmission cannot operate properly.
They operate via a voltage or current supplied via the transmission's computer or controller. transmission solenoid valves are usually installed in a transmission valve body, transmission control unit or transmission control module.
Benefits of Transmission Solenoid Valve
External leakage is blocked, internal leakage is easy to control, and use is quiet.
Leaks inside and out are elements that endanger peace. Other automatic control valves usually extend the valve stem, and the movement or movement of the valve core is controlled by electric, pneumatic and hydraulic actuators. This has to deal with the difficulty of external leakage of the dynamic seal of the long-lasting valve stem; only the transmission solenoid valve is completed by electromagnetic force acting on the iron core sealed in the magnetic isolation sleeve, and there is no dynamic seal, so the external leakage is easy to block. absolutely. The torque control of the electric valve is not easy, it is easy to cause internal leakage, and even the head of the valve stem is pulled off; the layout of the solenoid valve can easily control the internal leakage until it drops to zero.
He system is simple and easy to connect to the computer, and the price is low.
Transmission solenoid valve has a simple structure and low cost, and is easier to install and protect than other types of actuators such as regulating valves. It is more obvious that the self-control system formed is much simpler and the cost is much lower. Because the solenoid valve is a switch signal control, it is very convenient to connect with the industrial computer. In the current era of computer improvement and price drop, the advantages of solenoid valves are even more obvious.
Action express, small power and light shape.
The response time of the transmission solenoid valve can be as short as several milliseconds, and even the pilot solenoid valve can be controlled within tens of milliseconds. Because it forms a self-loop, it is more flexible than other automatic control valves. It is assumed that the power consumption of the appropriate solenoid valve coil is very low, and it is an energy-saving product; it can also be achieved only by triggering the action to automatically maintain the valve position, and it usually does not consume electricity at all. The solenoid valve has a small shape and size, which not only restricts space, but also is light and beautiful.
The conditioning accuracy is limited, and the combined medium is limited.
Transmission solenoid valve (Solenoid valve) usually only needs to switch two states, the valve core can only be in two extreme positions, and cannot be continuously adjusted. necessarily limited. The solenoid valve has high requirements on the cleanliness of the medium, and the medium containing particles cannot be used together. If it is an impurity, it must be filtered out first. In addition, the thin medium cannot be used together, and the viscosity range of the medium used for a specific product is relatively narrow.
How Does A Transmission Solenoid Work?
As you drive down the street, the car’s computer analyzes data sent from vehicle speed sensors and engine speed sensors. Based on this information, the engine control module (ECU) or the transmission control module (TCM) performs the appropriate upshift / downshift by sending a signal to one of several shift solenoids.
These transmission solenoids have a spring-loaded plunger inside that is wrapped with wire. When this coil of wire receives an electrical charge from the TCM / ECU, the plunger opens allowing transmission oil to flow into the valve body and pressurize the desired clutches and bands. In this case, the transmission changes gears and you will drive down the road.
The car’s computer can control the transmission solenoid in a number of ways. If the vehicle is equipped with a special transmission control unit, it can open or close the hydraulic circuit with a direct 12 V signal.
Or the engine control unit can control the solenoid’s plunger by turning the ground circuit on and off. A solenoid can be used to control a single gear or multiple gears, depending on the complexity of the design.
Type of Transmission Solenoid Valve
In a direct-acting solenoid valve, a coil magnetically opens the valve in direct action, lifting the shaft and the seat of the valve without depending on outside pressure.
In pilot operated valves, the plunger opens up the pilot opening while built-up pressure causes the valve to open and close.
Although piloted valves require less electrical energy to operate, they usually need to maintain full power in order to remain in an open state, and they perform at a slower rate than direct-acting solenoids.
Each of the two ports on a two-way valve is alternately used to permit flow as well as close it off. A two-way valve can be specified to be either “normally open" or “normally closed” in its operation. With a normally open valve, the valve remains open until some type of current is applied to close the valve. Suspension of the electrical power causes the valve to automatically reopen to its normal state. A normally closed solenoid valve is the most common, working in the opposite fashion, remaining closed until a power source causes it to open.
Three-way valves come with three ports. These are commonly used when alternate and exhaustive pressure is required for operation, as with a coffee machine or dishwasher.
These valves can have four or more port connections. Four-way valves are commonly used with a dual-acting cylinder or actuator. In this version, half of the port connections supply pressure, and the remaining connections provide exhaust pressure. You can specify these valves to be either normally closed, normally open or universal.
Replace a Faulty Transmission Solenoid
Step 1. Disconnect the Car Battery
The mechanic will remove the negative and positive battery terminals, respectively. They’ll also remove the dipstick from the transaxle to access the solenoid easily.
Step 2. Loosen the Fill Plug
Before draining the transmission fluid, they’ll loosen the fill plug to prevent it from getting stuck. This makes it easier to refill the pan later.
Step 3. Remove the Fluid Compartment
The mechanic will unscrew each bolt that secures the fluid compartment to the bottom of the transmission and remove the gasket from the transmission pan.
Step 4. Drain the Transmission Pan
Before draining the pan, they’ll place a container underneath the transmission to catch the fluid and remove the drain plug.
Step 5. Unscrew Fix Plate Bolts
They’ll locate the solenoid, disconnect all wires from the unit, and remove it from the fixing plate (the mounting surface where the solenoid is attached).
Step 6. Replace the Valve Body and Solenoid
The mechanic will turn the locking ring to release the fill plug from the valve. Afterward, they’ll remove the sleeve and each bolt attaching the valve body to the transmission.
They’ll pull the wires and pry the solenoid from the housing mount, replacing it with a new one.
Step 7. Reassemble the Components and Add Fluid
They’ll refill the transmission fluid and reattach all other components.
Warning Signs that Solenoids are Failing
There are of course some components and systems on your car that if they fail it’s an annoyance but they don’t impact the overall safety and performance of your vehicle, such as your A/C compressor, or your infotainment system. You want them to work all the time, but if they don’t it’s not the end of the world. However, if your transmission solenoids are failing, then it’s time to take immediate action.
Downshifting Becomes a Struggle
Let’s start with what happens if you are braking or otherwise slowing, but your engine is continuing to rev at quite a high rate. This is showing some kind of delay or other malfunction that is negatively affecting your downshifting. This sign isn’t a definitive sign that the solenoid is broken, but it certainly indicates it’s experiencing difficulty. That difficulty, however, could be created by contaminated or old transmission fluid causing the solenoid to get stuck and thus not be able to open and close properly. Bad fluid can also delay the signals from the ECU.
You See a Check Engine Light (CEL)
The much-feared “Check Engine” light can of course mean many things, but if you see the CEL emerge in conjunction with other signs mentioned in our list, then the likely explanation for it is that your solenoids are experiencing some kind of malfunction. Another good way to be sure about this is to see if your car also goes into limp or a “fail safe” mode at the same time. If it does, then it is because there is something fundamentally wrong with the drivetrain, and that could be the solenoids.
You Can’t Get Out of Neutral
If you’re trying to move your car but it seems to be completely stuck in neutral gear, it’s another sign that the solenoids are not able to act upon information that they are receiving from the ECU. Very often this is not permanent but will create a significant delay between shifting the car into drive “D” and then moving along. This severe delay in shifting is very likely due to the lack of ability of your solenoids to open and close properly as instructed by the ECU. Once again, however, it is also more a sign that you need new transmission fluid than a sign that the solenoid itself is broken.
General Erratic Shifting
Finally, if you are sensing a general unevenness in your car’s ability to shift between gears, such as high revving in the engine but no response from the transmission, or continued revving when you are slowing down, then it should be enough of a warning sign to have your solenoids checked. Since the solenoids’ job is to maintain that fluid and smooth equilibrium between the many moving parts, it’s natural to suppose that unevenness is caused by problematic solenoids.
Nut: Holds the coil onto the valve and threads over the stop piece of the guide tube assembly.
Housing: Metal plate that covers the coil and helps complete the magnetic circuit created by the coil when energized.
Coil: Element of the valve that when energized creates a magnetic field. Comprised of copper magnet wire spooled around a bobbin.
Flux Plate: Metal plate that helps complete the magnetic circuit with the housing.
Guide Assembly: Metal tube that internally houses the plunger, and acts as the external mounting post for the coil. The magnetic stop piece is welded to the top and the flange is welded to the bottom.
Plunger Assembly: Magnetic plunger that is typically 430FR SS, including the plunger seal and spring.
O-Ring: Seal material that prevents the fluid from leaking external to the valve. This seals the guide tube flange to the valve body.
Body: The portion of the valve that has the plumbing connections and also the seat for the plunger to seal on.
Maintenance Tips for transmission solenoid valve
Regularly monitoring and maintaining your transmission solenoid valve is vital for ensuring your vehicle’s best performance and longevity. To keep your transmission solenoid valve in top condition, start by checking and changing the transmission fluid at recommended intervals to prevent solenoid issues.
Monitor your vehicle’s performance for signs of solenoid malfunction, such as delayed shifting, and address any problems promptly to avoid costly transmission repairs. Consult a professional for routine solenoid inspections and maintenance, as they can provide solenoid troubleshooting techniques and maintain peak solenoid health.
By incorporating these solenoid maintenance practices into your regular vehicle care routine, you can help prolong the lifespan of your transmission system and maintain smooth operation on the road.
Automotive solenoid valves and sensors are our company's featured products. At the same time, our company is also a professional manufacturer specializing in the production of solenoid valve coils and special solenoid valves and other automation supporting components.
Our Certificate
FAQ
As one of the leading transmission solenoid valve manufacturers and suppliers in China, we warmly welcome you to buy high-grade transmission solenoid valve made in China here from our factory. All customized products are with high quality and competitive price.
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