Appendix; Technology Of Proportional Valves; Figure 42 Signal Flow In The Proportional Hydraulics - WAGO 750 Product Manual

Appendix

8 Appendix

8.1 Technology of Proportional Valves

Proportional valves can be used to control the throughput of liquids or gases. The
throughput is determined by a lifting armature that is pressed on the valve seat by a
spring. Thus the valve is closed in its inactive state. A further component of the propor-
tional valve is an electromagnet that consists of one or more coils. This magnet acts on
the lifting armature in the opposite direction. The force applied by the electromagnet is
proportional to the current supplied. By regulating the current flow, it is possible to control
the position of the lifting armature, and thus the throughput in the proportional valve.
Proportional valves are available in different designs. Key differences include the follow-
ing:
• The number of coils
• The maximum possible throughput
• The electrical current that must be supplied
Proportional valve modules can control proportional valves very precisely. They are in-
stalled upstream of each proportional valve that is used. During operation, they generate
the current flow, which adjusts the respective proportional valve to the desired through-
put. In addition, proportional valve modules can offer expanded functions, such as a set-
point control by means of a ramp generator and dithering for static compensation.
The following figure shows the signal flow during in the interplay among the individual
technological components:
74 Product manual | Version: 1.1.0
Proportional Valve Module 2-3-4
Figure 42: Signal Flow in the Proportional Hydraulics
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