HKT Magnetic Valves

About Magnetic Valves

Magnetic valves use the electromagnetic force of coils to open and close the intake and exhaust valves. They control the valve timing and the lift level by using the duration and amount of electricity conducted in the coils.
HKT magnetic valves are structurally designed to perform smoothly in harsh environments. They are installed in commercial vehicles and construction machinery.
The magnetic valves are not only used for motor vehicles, but also used in various fields including home electric appliances, plant facilities, and medical appliances.


Positive Air Magnetic Valves

This valve is mainly installed in large and medium-sized trucks and buses for controlling various devices (PTO, transmission, exhaust brakes).
Moreover, its structure is designed to prevent the entry of water and dust in order to function properly even in the toughest environments.

Negative Air Magnetic Valves

This valve is installed in small trucks and minibuses in order to control exhaust brakes, by controlling the negative pressure for moving the butterfly valves in the exhaust pipes.
The valve is designed to be compact and be able to fit properly into tight spaces of small trucks. It has high durability in spite of its size.
This type of magnetic valves is also available with filters in order to prevent water and dust infiltration, providing reliability in the most severe conditions.

Magnetic Valves for VG Turbos

A Variable Geometry Turbo (VGT) system generates optimum supercharging pressure by controlling variable geometry wings attached to turbines according to the load and the number of revolutions in the engines.
HKT magnetic valves control variable geometry wings and are able to control 8 levels by connecting three valves.
Moreover, they are designed to be resistant to high temperature and high vibrations, since they are directly attached to the engines.

Magnetic Valves for LLC (Water valves)

This magnetic valve is adopted for the Urea SCR system, which complies with the so-called "Post New Long-Term Emission Regulation," which is one of the strictest exhaust gas regulations in the world. Long-life coolant (LLC, engine coolant water) is circulated in the system and prevents urea water from freezing.
*The Urea SCR system is a technology which purifies the exhaust. It removes NOx from the diesel engine's exhaust by using an aqueous urea solution.

Fuel-cut Valves

This valve opens and closes in order to control the fuel intake passage. It should be installed not only in the fuel injection pump, but also in the system which controls the post-processing of exhaust gas from diesel engines.
The valve has an essential function to let the fuel flow while the engine is in operation, while also cutting the fuel flow when the engine is stopped.

Proportional Magnetic Valves (Air)

This valve is used in fully automatic mechanical transmissions.
The valve controls the flow rate of compressed air by applying electric current so that it can control the angle of actuator steplessly.
Therefore, a partially applied clutch operation is possible, contributing to easy driving of multistage transmission vehicles.

Magnetic Valves for Compressed Natural Gas (CNG)

This magnetic valve is placed in vehicles that use compressed natural gas. In order to be used under high pressure, it incorporates a pilot drive and self-sealing structure, and low heat specifications which suppress heat generation when the coils are continuously energized.

Oil Control Valves

This valve is used to control torque converters and hydraulic cylinders for trains, vessels, general industrial machinery, and construction machinery.
Because these products are used under severe conditions of heat and vibration, it is essential to have high performance and strict quality control.

Magnetic Valves for Retarder Systems

This magnetic valve is used for controlling the retarder system, which is referred to as the third brake (auxiliary brake).
It can reliably control double-acting cylinders by securely engaging two outlets from one positive voltage source.
The retarder system is mainly installed in large trucks and sightseeing buses. The key role of this system is to reduce the speed of vehicle bodies by applying resistance to the propeller shafts using the fluid controlled by a magnetic valve.

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