What is a Valve Body?

Educational

Dec 17th, 2018

What is a Valve Body?

A valve body is a noteworthy part of a vehicle's automatic transmission framework. It works in a system frame. The valve body guides pressurized transmission liquid to a system of valves that set up together suitable grip packs for smooth shifting of gears. Furthermore, the valves utilize the weight of pressure driven signs, deciding the gear set, otherwise called the servo. This procedure performs when there is a change in the speed from low to high or the other way around. 

If something somehow managed to turn out badly with the transmission valve body, at that point these valves wouldn't have the capacity to get the pressure driven liquid that it needs to work.

Three major components of the valve body:

  1. The upper valve body
  2. The lower valve body
  3. The manual valve body

The most essential valve in the valve body and the one that you have coordinate authority over is the manual valve. This valve is specifically associated with the handle of the gear shift and covers and reveals different entries relying upon what position the gear is put in. When you put the gear in Drive, for example, the manual valve guides liquid to the grasp pack(s) that initiates gear one. It likewise sets up to screen vehicle speed and accelerator position so it can decide the ideal time and the power for the 1st gear to the 2nd gear move. On PC controlled transmissions, you will likewise have electrical solenoids that are placed in the valve body to guide liquid to the fitting grip packs or groups under PC control to all the more decisively control shift focuses.

Types of Valve Bodies

Ordinarily, there are two sorts of the valve body; the primary kind is Electronic Valve Body and Hydraulic valve body

Electronic Valve Body

Which utilizes electronic framework ECT--electronic controlled transmission as fundamental control to work all gear changes on the automatic transmission. What's more, numerous more up to date autos are utilizing this ECT which have groups and grips that are worked from power through pressure. Nonetheless, an electric solenoid valve is utilized to control each pressure driven circuit. This is the thing that enables the transmission to have more detailed and propelled control plans than the non-ECT automatic valve body. The controller of the transmission can screen the throttle position, vehicle velocity, the electronically monitored slowing mechanism, and the motor speed. 

Hydraulic Valve Body

All framework works utilizing pressure driven weight and controlled by every valve that connected to the gear handle. When you vary the position of the gear's handle, it will reveal and cover certain entries in the valve body to oblige that position. Along these lines, if you somehow happened to switch the gear handle to "Drive," at that point liquid would be coordinated into the grip, and the first shift would be enacted. 

Types of Valves Encased by the Valve Body

The valve body contains a few kinds of valves. These include: 

Pressure Control Valves:

These type of valves regulates the weight inside the transmission valve body, including: 

  • The Essential Controller Valve: This valve decides the measure of oil that spilling out of the transmission siphon.
  • The Auxiliary Controller Valve: This valve directs the weight of the oil setting off to the torque converter. 
  • The Oil Cooler Detour Valve: This valve controls the weight of the oil setting off to the oil cooler. 
  • The Weight Alleviation Valve: This valve goes about as a "wellbeing switch," keeping the weight inside the oil siphon from surpassing suggested levels.

Shift Control Valves: 

The function of these valves is to open and close liquid entries as required. 

  • The Manual Valve: This valve goes about as an ace control, guiding oil to different territories inside the transmission. 
  • The 1st Gear to 2nd Gear Shift Valve: This valve directs gear changing from gear one to gear two and the other way around.
  • Timing Valves: The entirety of the work of this valves is to make sure that the gear shifts are not delayed.
  • The Downshift Timing Valve: This averts unsanctioned downshifting when the car is on a drive. 

The Accumulators:

These valves help cushion the shock of a gear shift by utilizing spring strain to counter liquid weight.

Pressure Modulating Valves

These valves help to adjust the measure of liquid in the transmission at some random time, it includes: 

  • The Cut-back Valve: This manages throttle weight as the vehicle accelerates or backs off, guaranteeing that the siphon is continually giving the right measure of oil. 
  • The Governor Modulator Valve: This diminishes the measure of strain the motor places on the transmission at extreme speeds.

Symptoms that Signals a Valve Body Replacement

On the off chance that you have a faulty transmission valve body, there are some unmistakable manifestations that you should pay special mind to. A significant number of the side effects just have to do with the clamors that you hear when you switch gears. 

Thumping Noises

While applying weight to the brakes or backing off the car, you may hear some slamming or thumping clamors. The odds are that you may hear some clumsy commotions when putting the vehicle in reverse gear and driving in reverse. In the event that your answer is yes to any of such situation infers that you have a terrible valve body.

Continuous slipping of Gear While Shifting

On the off chance that the changing stick slips routinely while switching the gears, there is likely an issue with your transmission valve body. If the transmission valve body works appropriately, your shifting stick ought to never slip. That implies there is something wrong with your valve body

Trouble in Downshift

In the event that transmission is experiencing issues in downshifting, it expresses that pressure driven liquid can't enter the valve body as it should. When this begins to occur, the gears won't work as they should, consequently debasing the execution of the vehicle. 

Deferral in Shifting

Is it accurate to say that you are confronting issue while switching your gears to drive or reverse? Frequently, it is a direct result of the transmission valve body that is working inappropriately. In this manner, the moving of the transmission encounters an extraordinary postponement. Be prepared! Because of this, it might make the vehicle stuck in neutral.

When you understand that you have an awful transmission valve body, the main move that you can make is to supplant it. It is prescribed that you motivate an expert auto technician to supplant the transmission valve body since one modest oversight could cause bigger mechanical issues. Try not to get enticed into doing the work yourself just to stay away from the expenses of procuring a repairman to do it. Their work expenses may appear to be a ton yet in the event that you mess something up; you could chance to destroy your whole transmission. At that point, it will cost you a large number of dollars to settle that.


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