Why do we need a petal valve?

A device designed to pass gaseous and liquid media in one direction and block their reverse motion is called a petal valve. The application was found in axial fans, where atmospheric air enters the room, and in internal combustion engines, which prevents the return of fuel from the cylinder to the carburettor.

The product for fans consists of a housing in whose bearings a specific blade shape is fixed. The bearings support the free running of the valve in the event of fan operation at negative temperatures. A working fan supplies air to the blades, which are constantly in the open position. After the termination of the work, the blades become in their original position, due to which the cross section of the valve is blocked.

There is a special modified flap valve. Tulip - its second name, based on its design boxed case of four walls. On the axes of the body are rigidly fixed profiled flaps made of galvanized steel. The type of junction of the doors is a lock.

From simple, on the basis of one blade, devices, the flap check valve features a low response rate and a lower standard flow rate that reveals it. It is particularly advantageous to use such a product in axial fan types, where the flow velocity is smaller in comparison with the radial types.

As for internal combustion engines, for pet owners, the petal valve resolves several questions. Its petals are made of flexible materials. When the piston goes to compress the mixture, then due to the pressure difference in the communicating chambers, they, by virtue of their flexibility, bend, opening the holes in the valve body through which the fuel mixture passes. The onset of the purging phase during the downward movement of the piston creates a directional pressure on the opposite side, causing the petals to press against the body, blocking the holes, which prevents the mixture from rolling away in the opposite direction. Among the positive qualities of the product are the following:

• Fuel economy. The progressive movement of the piston upwards forms a vacuum in the crankcase space. Then, through the carburetor, air is sucked in there, mixed with gasoline, which causes the fuel mixture to form. The mixture enters as long as the piston moves upward. As soon as it starts to go down, the pressure exerts an effect on the petal valve, and the petals block the mixture back. Around the carburetor will be clean, and no release of the mixture into the atmosphere occurs, the losses are minimized.
• Engine power. The petal valve allows you to increase the power at small and medium speed. The secret is that more mixes get into the crankcase and into the cylinder, because the previously released into the atmosphere portion is used for its intended purpose.
• Squat of the vehicle. This phenomenon is a direct consequence of the previous property - the increase in power.
• Steady idling. The fact is that the idling mode consists of low engine speed. Just at these speeds, the effect of the mixture's reverse motion is most pronounced. The flap valve for every movement of the piston passes into the crankcase the exact amount of the mixture.
• Simple engine start. The intake of a stable portion of the mixture in the cylinders makes it possible to start the engine more easily, as the saying goes - "with poltychka."