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The principle of the hydraulic valve system introduced
Used to control the components of the fluid pressure, flow and direction of hydraulic valves: hydraulic transmission. Control pressure as the pressure control valve controlling the flow referred to as flow control valve to control the pass, breaking and direction as the direction control valve.
Pressure control valve
Use is divided into the relief valve, pressure reducing valves and sequence valves.
???? Relief valve (1): able to control the hydraulic system when the set pressure is reached to maintain a constant state. Relief valve for overload protection known as the safety valve. When the limit value of system failure, the pressure that may damage the valve port open the overflow, in order to ensure the safety of the system.
???? Pressure reducing valve (2): depression than the main loop oil and stable pressure control branch circuit. It controls pressure reducing valve can be divided into a fixed value of pressure reducing valve (output pressure to a constant value), fixed differential pressure reducing valve (input and output pressure difference value) and fixed ratio pressure reducing valve (between input and output pressure to maintain a certain percentage).
???? (3) action after sequence valve: make an actuator (such as hydraulic cylinders, hydraulic motors, etc.), and then the order so that the actuator action. Pump pressure of the first to promote a movement of the hydraulic cylinder, the area A through the sequence valve in the inlet role, when the hydraulic cylinder a movement entirely into pressure, the role of the upward thrust of the area A is greater than the spring adjustment fixed value, the spool rise to the port connected to the inlet and the oil hydraulic cylinder movement.
Flow control valve
Adjust the spool and the valve orifice area and its local resistance to regulate the flow, to control the speed of the actuator movement.
The flow control valve use is divided into five kinds.
???? The throttle (1): it is set orifice area, little changes in the load in the pressure and the implementation of the sports uniform low velocity components remained essentially stable.
???? (2) speed control valve: pressure change in the load can maintain throttle pressure drop for a given value. Thus, in the orifice area it is set, regardless of the load pressure of changes in the speed control valve can maintain constant flow through the throttle valve, so that implementation of the components of velocity and stability.
???? (3) diverter valve: regardless of load size, make two of the same oil source implementation of the components equal flow for the same amount of shunt valve or synchronization valve; traffic pro rata for the proportion of shunt valve.
???? On the contrary, (4) set flow valve: the role of the diverter valve to flow into the set flow valve pro rata.
???? (5) diversion set flow valve: both the shunt valve and set flow valve two functions.
Directional control valve
Use is divided into one-way valve and valve.
???? One-way valve: only allow one-way connected to the fluid in the pipe, the reverse is cut off.
Valve: change pass, breaking the relationship between different piping, based on the control channel in two-pass, three links, Stone, according to the working position of the spool in the valve body, two, three, etc.; The five-way; points spool drive motor, electric, manual, hydraulic.
???? P is the oil mouth, O for oil return port, A, B leading to the implementation of components of output. All ports when the spool is cut off, the actuator does not move; spool to right, P and A pass through B and O; when the spool is moved to the left, P and B through A and O pass. In this way, the actuator can be positive, the reverse movement.
The late 1960s, developed on the basis of several hydraulic control valve electro-hydraulic proportional control valve. Its output with the input electrical signal of the (pressure, flow) is continuous change. Electro-hydraulic proportional control valve according to the role, divided into electro-hydraulic proportional pressure control valve, electro-hydraulic proportional flow control valves and electro-hydraulic proportional directional control valve.
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