34Rev. C, April 2017
TECHNICAL DATA Moog D680 Series Proportional Control Valves
SIZE 08 - D684 PROPORTIONAL VALVE
34
TECHNICAL DATA
Rev. C, April 2017
Moog D680 Series Proportional Control Valves
SIZE 08 - D684 PROPORTIONAL VALVE
Installation Drawing for Fail-safe Options U and W
2
Y
X
Y
1
11+PE
(6+PE)
8
(0.32)
63
(2.48)
130
(5.12)
46.5
(1.83)
272.5
(10.73)
57
(2.24)
2
(0.08)
20
(0.79)
ø
55.5
(2.19)
25
(0.98)
ø
20
(0.79)
117
(4.61)
119
(4.69)
13.5
(0.53)
ø
32
(1.26)
6
(0.24)
ø
39
(1.54)
ø
158
(6.22)
389
(15.31)
20
(0.79)
125
(4.92)
Mating connector
Headroom for
disconnecting
[85]
[(3.35)]
21
(0.83)
1 Electric null adjust (behind screw plug)
Attention! Electric null adjust is not possible if the position of the main spool is monitored!
2 With dampening plate
Optional X and Y external Optional X and Y external Only X and Y external
TP
YX
BA
TP
YX
BA
TPYX
BA
Fail-safe option U
4-way design
Fail-safe position P → B and defined
center position
Fail-safe option W
4-way design
Defined center position
Fail-safe option W
2x2-way design
Defined center position by mechanical
spool stop
Flow direction only according to
symbol
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