High Precision New Diesel Injector Control Valve F00ZC01319 Valve Assembly for Fuel Injector Engine Spare Parts

The injector valve assembly usually consists of a valve seat and a ball valve. Some injector valve assemblies consist of a valve cap, a valve stem and a steel ball. The following is a detailed introduction:

Valve seat
Function: Cooperate with the ball valve or valve stem to provide sealing and guidance for it, which is the basis for the injector valve assembly to achieve precise control. When the injector is not spraying fuel, the valve seat fits tightly with the ball valve to prevent the high-pressure fuel from leaking through the return oil channel, ensuring that the high-pressure control chamber maintains high pressure and the needle valve is in a closed state; during the injection process, the valve seat can guide the ball valve or valve stem to move accurately to ensure the opening and closing accuracy of the fuel channel.
Material and manufacturing: Generally made of high-strength and wear-resistant alloy materials, such as alloy steel containing tungsten, molybdenum and other elements. After precision machining and grinding, its surface roughness is extremely low to ensure the sealing performance and matching accuracy between the ball valve or valve stem.

Ball valve
Function: Under the action of electromagnetic force and spring force, the ball valve and the valve seat are separated or fitted, thereby controlling the on-off between the high-pressure control chamber and the return oil channel. When the injector needs to spray fuel, the ball valve leaves the valve seat under the action of electromagnetic force, so that the fuel in the high-pressure control chamber can be depressurized through the oil return channel, and then trigger the needle valve to start the injection; after the injection is completed, the ball valve returns to the valve seat under the action of the spring force, closes the oil return channel, and prevents fuel leakage.
Material and manufacturing: Usually materials with high hardness and good wear resistance, such as tungsten carbide, ceramics, etc., are selected to resist the erosion of high-pressure fuel and the wear caused by frequent movement. The ball shape of the ball valve is extremely accurate, and the surface is finely ground and polished to ensure that the sealing gap with the valve seat is extremely small and uniform.

Valve cap
Function: Usually used as the shell or fixed part of the valve assembly, it protects and positions the internal valve stem and steel ball and other components to ensure that they maintain the correct position and posture during operation, and also participates in the formation of a part of the fuel channel.
Material and manufacturing: Generally made of metal materials, such as stainless steel, aluminum alloy, etc., with certain strength and corrosion resistance. Its manufacturing process includes casting, forging, machining, etc. to ensure its dimensional accuracy and surface quality and meet the assembly requirements with other components.

Valve stem
Function: In cooperation with the valve bonnet, under the action of electromagnetic force, the valve stem can move up and down in the valve bonnet, and the opening and closing of the fuel channel is controlled by controlling the position of the steel ball. When the valve stem moves upward, it drives the steel ball to leave the pit on the valve bonnet, so that the fuel channel is opened and high-pressure fuel is allowed to pass; when the valve stem moves downward, the steel ball returns to the pit under the action of spring force or its own gravity, closing the fuel channel.
Material and manufacturing: High-strength metal materials such as chromium-molybdenum alloy steel are mostly used, and they are processed through precision machining and heat treatment processes to obtain good strength, hardness and wear resistance, while ensuring the matching accuracy between it and the valve bonnet, ensuring the flexibility and sealing of movement.

Steel ball
Function: As a key control element in the valve assembly, the steel ball forms a sealing match with the pit on the valve bonnet under the drive of the valve stem to control the opening and closing of the fuel channel. Its high-precision spherical shape and surface quality can achieve a good seal in the valve cap pit, ensuring that the fuel can be injected or refluxed through the channel when needed.
Material and manufacturing: Generally made of high-quality bearing steel or ceramic materials, it has extremely high hardness and wear resistance. The manufacturing process of the steel ball requires multiple precision machining processes, such as cold heading, grinding, polishing, etc., to ensure its dimensional accuracy and surface finish to meet the working requirements of the injector valve assembly.