TORK Hydraulics. is the special designer and manufacturer of the Hydraulic components, including modular solenoid operated flow control valve, modular flow regulator, modular flow control valve, adjustable flow control valve,etc. This kind of valve is a combination of check valve and solenoid valve, which is able to use electrical signals to control full opening or throttling of the oil circuit, so as to achieve high and low-speed flexible switching of the actuator