Hr Servo Solenoid Valves - Siemens SINAMICS S120 System Manual

Appendix
A.3 Hydraulic
A.3.1.4

HR servo solenoid valves

General
The HR (High Response) servo solenoid valves offer particularly good dynamic and static
characteristics, making it the ideal addition to the portfolio to address highly sophisticated
applications.
Both valve stages for precontrolled valves operate with position control.
Features
In contrast to the other servo solenoid valves, HR servo solenoid valves have the following
features:
● A significantly better dynamic response
● A smaller size
● A higher hydraulic switching capacity
HR valves do not have the fail-safe position provided on other servo solenoid valves. Many
applications therefore require external non-return valves, such as those available as
sandwich-plate valves.
Figure A-17 Directly-controlled HR servo solenoid valves
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System Manual, 04/2015, 6SL3097-4BA00-0BP1
Hydraulic Drive