Bypass pressure valve in the car

The bypass valve rotates by means of exhaust gases, which untwist it, passing through the blades of the impeller. The propeller (rotating impeller) rotates the turbine wheel, which contributes to creating pressure in the reservoir. The level of this pressure is determined by the total amount of air passing through the turbine.

The amount and speed of exhaust gases depend on the frequency of the engine's rotation, that is, the more is accomplished per minute of rotation and the more power, the more turbulent the exhaust gas passes, correspondingly, a stronger pressure is created.

On the impeller of the turbine, the exhaust gas flow must be reduced. Most often in stock cars, an internal bypass valve of the turbine is used, due to which exhaust gases are directly discharged from the turbine housing . But many pressure valves are installed prior to entry, replacing parts of the exhaust manifolds or installing a cross pipe.

The internal bypass valve has a large opening through which the exhaust gas exits. In the internal valve there is a special damper covering this hole during the operation of the turbine (when typing the required pressure). This damper is connected to a lever located on the outside of the turbine. And it is connected to the lever of the activator, which is a pneumatic device that converts pressure into linear motion with the use of a spring and a diaphragm. Lever activator activates the flap until it is fully opened.

A solenoid is a specialized device installed in front of the activator, which changes the pressure entering the activator. With a change in the operating cycles, the solenoid passes through itself less or more air. It is controlled by a computer that reads the values of pressure and gives orders to reduce or increase the boost by closing or opening the valve.

The lever itself moves freely, swaying on the mount. In the event that this happens not so and moves it is not free, when detaching from the valve rod, then there is some problem and it needs to be corrected. Sometimes the lever can move in jerks, especially when heated. The length of the activator's traction varies depending on the degree of closure / openness of the bypass valve. The tightening shortens the thrust of the valve, and the relaxation lengthens it. If the bypass valve is closed more tightly and the thrust is shorter, more pressure is required to open the activator.

The external bypass valve is a separate device designed to operate independently of the turbine housing. Usually they are calculated for a larger airflow than for internal ones. Most have a double activator, which facilitates the rapid opening of the valves and thus provides better control over the untwisting of the turbine. External valves can have different springs, with the replacement of which can be set to a minimum boost level.