Hydraulic solenoid valve 4212228 TOSD-06-151 Construction machinery parts

     Electro-hydraulic proportional valve is called proportional valve. Ordinary hydraulic valves can only control the pressure and flow of liquid flow by pre-setting. However, when the equipment mechanism requires adjustment or continuous control of the pressure and flow parameters of the hydraulic system during the working process, for example. The work table is required to achieve the feed at the speed of slow, fast and slow continuous changes during the work feed, or to simulate an optimal control curve with a certain precision to achieve the force control. Ordinary hydraulic valves can not achieve. At this time, the hydraulic system can be controlled by the electro-hydraulic proportional valve.

      Electro-hydraulic proportional valve is a type of valve that continuously and proportionally controls the flow direction, flow rate and pressure of the hydraulic system according to the input electrical signal. It consists of two parts: the electric-mechanical proportional conversion device and the hydraulic control valve body. The former converts the input electrical signal into mechanical force and displacement output continuously and proportionally, while the latter outputs pressure and flow continuously and proportionally after accepting such mechanical force and displacement.
The development of electro-hydraulic proportional valve mainly has two ways: one is to replace the manual adjustment device of the traditional hydraulic valve with proportional electromagnet or to replace the ordinary electromagnet. The second is developed by the electro-hydraulic servo valve to simplify the structure and reduce the accuracy. The proportional valves described below all refer to the former, which is the mainstream of today's proportional valves. It is interchangeable with ordinary hydraulic valves.