Idoneam Volvo proportionalem Rotarius solenoid valvae (MMCCCLXXI) CDLXXXII

Electro proportionalem valvae opus principium et deprehendatur:
Valvae potestate fluxus potest dividitur in duo genera:
Unum est switch imperium: aut plene aperta vel plene clausit, fluunt rate est vel magna vel parva, non est medium rei publicae, ut Ordinarius electro per valvulae, electro reversing valvulae.
The other is continuous control: the valve port can be opened according to the need of any degree of opening, thereby controlling the size of the flow through, such valves have manual control, such as throttle valves, but also electronically controlled, such as proportional valves, servo valves.
So the purpose of using proportional valve or servo valve is: to achieve the flow control by electronic control (of course, after structural changes can also achieve pressure control, etc.), since it is throttling control, there must be energy loss, servo valve and other valves are different, its energy loss is greater, because it needs a certain flow to maintain the work of the pre-stage control oil circuit.

The main valve of the servo valve is generally the same as the reversing valve is a slide valve structure, but the reversing of the valve core is not driven by an electromagnet, but by the hydraulic pressure output of the pre-stage valve, which is more similar to the electro-hydraulic reversing valve, but the pre-stage valve of the electro-hydraulic reversing valve is a solenoid Reversing CYMBALON, et Pre-scaena CYMBALON de Servo CYMBALON COLLUM COLLUM BAFFLE CYMBALON vel jet pipe valvae cum melior dynamic characteres.