48Rev. C, April 2017
BACKGROUND Moog D680 Series Proportional Control Valves
DESCRIPTION OF OPERATION
48
BACKGROUND
Rev. C, April 2017
Moog D680 Series Proportional Control Valves
DESCRIPTION OF OPERATION
Moog Proportional Control Valves for Applications with Safety Requirements
Installation in safety-related parts of
control systems in accordance with
DIN EN ISO 13849-1:2016-06
Moog D680 Series Proportional Control Valves are
suitable for installation in safety-related parts of control
systems in accordance with DIN EN ISO 13849-1:2016-06,
subject to the following requirements:
• The valves must be fitted with springs for setting the
main spool to a defined position.
• The safety-relevant function of the valves is to set the
main spool to a defined position by spring power to
prevent unsafe motion after the power that controls
the main spool has been shut off.
• If a motion of the actuator in the safe position has to
be prevented, a sufficient overlap must be selected.
Note that in the case of spool valves internal leakage
may occur even with large overlaps, and this may result
in a drifting motion of the actuator.
• Depending on the required safety functions it may be
necessary to fit pilot-controlled valves with integrated
4/2-way solenoid valves.
• The user has to comply with the basic and well-tried
safety principles for implementation and operation of
valves in accordance with DIN EN ISO 13849-2:2013-
02, Tables C.1 and C.2.
• The user implements the valves in accordance with the
environmental and application conditions described
in the catalog, the operating instructions and the
mounting and installation notes.
The valves have been designed to conform to the basic
and well-tried safety principles in accordance with
DIN EN ISO 13849-2:2013-02, Tables C.1 and C.2.
If the above requirements are met, an MTTFd of 150 years
or a time according to table C.1 of DIN EN ISO 13849-
1:2016-06 can be set for the safety-relevant function of
the valves.
Please note: Moog cannot give values for the Performance
Level or the Diagnostic Coverage of the valves, because
these values also depend on the system surrounding the
valves and cannot be determined for the valves alone.
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