Moog D661K Series User manual

Operating
Instructions
CA49305-001; Version 3.0, 10/07
Servo and proportional valves
with integrated electronics for
areas with potentially explosive atmospheres
D661K, D662K, D663K and D664K Series
ISO 4401, sizes 05 to 08

2 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 3
Table of Contents
1 Safety Instructions page 3
2 Description page 4
3 Technical Data page 7
4 Installation page 10
5 Setting up page 14
6 Maintenance page 14
7 Malfunctions – Causes and Troubleshooting page 15
8 Declaration of Manufacturer page 15
9 Tools page 15
10 Spare Parts and Accessories page 16
11 Ordering Information page 18
1 Safety Instructions
D661K, D662K, D663K and D664K Series
1.4 Selection and qualification of personnel
Service work carried out by the user on explosion protection
valves is prohibited, as intervention by third parties renders
the explosion protection permit null and void.
1.5 Safety instructions for specific operational phases
1.5.1 Take the necessary precautions to ensure that the valve is
used only when in a safe and reliable state.
1.5.2 Check the valve at least once per working shift for obvious
damage and defects (e.g., leakage or damaged cables).
Report any changes to the responsible group/person
immediately. If necessary, stop the machine immediately
and secure it.
1.5.3 In the event of malfunction, stop the machine/plant
immediately and secure it. Have any defects rectified
immediately.
1.5.4 If the machine/plant is completely shut down for
maintenance and repair work at the valve, it must be
secured against inadvertent start up by:
ULocking the principal control elements and
removing the key.
Uattaching a warning sign to the main switch.
1.6 Safety instructions for the operation of hydraulic
plants
1.6.1 Work on electrohydraulic equipment must be carried out
only by personnel having special knowledge and experience
in electrohydraulic controls.
1.6.2 Check all lines, hoses and fittings of the plant regularly for
leaks and obvious damage. Repair damage immediately.
Splashed oil may cause injury and fire.
1.6.3 Before removing the valve depressurize all system sections
to be opened, pressure lines and accumulators of the
hydraulic system in accordance with the specific instructions
for the plant.
1.6.4 When handling oil, grease and other chemical substances,
observe safety regulations valid for each product.
1.1 Warnings and symbols
Refers to special instructions and prohibitions to
prevent damage
Refers to special instructions and prohibitions to
prevent injury or property damage
1.2 Correct application
1.2.1 The permissible gas groups, which are part of the below
identification, have been modified according to IEC 60079.
Operation with other gases is not allowed!
Prior to starting-up the valve, it must be checked if the gas
used is among the permissible gases.
1.2.2 The valves series D661K, D662K, D663K and D664K are
electrical equipment for hazardous areas, type of protection
"d" ("d" Flameproof enclosure to IEC 60079-1).
Identification D661K/D662K/D663K/D664K Series:
II 2G Ex d IIB+H2 T5 Ta: 80°C
Nemko 07ATEX1060, 0123.
1.2.3 The valves are servo and proportional valves intended for
position, velocity, pressure and force control in hydraulic
control systems that operate with mineral oil based fluids.
Using the valves for purposes other than those mentioned
above is considered contrary to the intended use. The user
bears entirely the risk of such misuse.
Correct application involves also observing the operating
instruction and complying with the inspection and
maintenance directives.
1.3 Organizational measures
1.3.1 We recommend to include this operating instruction into
the maintenance plan of the machine/plant.
1.3.2 In addition to the operating instruction, observe also all
other generally applicable legal and other mandatory
regulations relevant to accident prevention and environ-
mental protection. Instruct the operator accordingly.
1.3.3 All safety and danger prevention instructions of the
machine/plant must meet the requirements of EN 982 and
IEC 60079-0.

4 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
D661K, D662K, D663K and D664K Series
2 Description
Valves of the D66XK Series are servo and proportional valves
with a Jetpipe pilot valve insensitive to dirt and electrical
return of the spool position.
In servo valves, the control spool runs in a bushing, which
is fitted into the body of the valve.
In proportional valves, the control spool runs directly in the
valve body.
Proportional valve D661K Series
2.1 Design and funktion
2.1.1 Servo and proportional valves
The D66XK Series valves are throttle valves for 2-, 3- and
4-way applications. 5-way applications are also possible
with the D661K proportional valve.
These valves are suitable for electrohydraulic position,
velocity, pressure or force control systems with high dynamic
response requirements.

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 5
D661K, D662K, D663K and D664K Series
Proportional valve D662K Series
2.1.1.1 General
All explosion protected servo and proportional valves are
equipped with a D061K Jetpipe pilot valve.
The Jetpipe pilot valve essentially comprises a torque motor
with a coil and armature, a Jetpipe and a receiver.
A current through the coil results in the anchor with the
Jetpipe being extended. The extended fluid jet, which is
bundled via the specific nozzle shape, impinges more on
one of the two receiver bores than on the other one.
In this way, a pressure difference is generated in the control
areas of the main stage. The resultant useful volume flow
displaces the control spool of the main stage. The return
to the tank is implemented via the ring area under the jet.
2.1.1.2 Operating principle of the two-stage valve
An electrical input signal (flow rate command) is applied
to the integrated control amplifier, which drives a current
through the coil of the pilot stage torquemotor. The thus
deflected Jetpipe produces a pressure difference across the
drive areas of the spool and effects its movement.
The position transducer which is excited via an oscillator
measures the position of the spool (actual value, position
voltage). This signal is then demodulated and fed back to
the controller where it is compared with the command
signal. The controller drives the torquemotor until the error
between command signal and feedback signal is zero. Thus
the position of the spool is proportional to the electric
command signal.

6 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
D661K, D662K, D663K and D664K Series
2.1.3 D66XK proportional valves in a fail safe version
For applications with proportional control valves where
certain safety regulations are applicable, a defined mete-
ring spool position is needed in order to avoid potential
damage.
Therefore fail safe versions are offered as an option
for the proportional valves.
After external triggering this fail-safe function causes a
defined metering spool position.
2.1.3.1 Mechanical fail safe version
The safe position of the spool will be obtained after cut-
off of pilot pressure X (external pilot connection) or
operating pressure supply (internal pilot connection).
See page 19 of the ordering information values for
fail safe functions.
2.1.3.2 Hydraulically operated fail safe version
In proportional valves, the two drive areas of the spool are
short-circuited in order to move into the safe position via a
2/2-way solenoid poppet valve.
The spool in fail safe version Kgoes into the middle position
after switching off pressure Zof the solenoid poppet valve.
When the supply voltage of the valve electronics drops,
but if the solenoid poppet valve is further supplied and the
control pressure is available, the spool moves to a defined
end position in version H.
Proportional valve D661K Series
with hydraulic fail safe valve

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 7
D661K Series
Model ... Type D661K...3...
Mounting pattern ISO, with additional 2nd T-port ISO 4401-05-05-0-05
Valve version 4-way
2-stage with bushing spool assembly
Pilot stage Jetpipe Standard
Pilot connection Optional, internal or external X and Y
Mass [kg] 5,7
Rated flow QN(±10 %) at ∆pN= 35 bar per land [l/min] 20 / 90 120 / 160 / 200
Maximum operating pressure pmax.
Main stage ports P with X external, A, B [bar] 350
ports T, T2with Y internal [bar] 20 % of pilot pressure, max. 100 bar
ports T, T2with Y external [bar] 350
Pilot stage regular version [bar] 210
with dropping orifice (on request) [bar] 350
Response time1) for 0 to 100 % stroke [ms] 14 18
Threshold1) [%] < 0,1
Hysteresis1) [%] < 0,5
Null shift with ∆T = 55 K [%] < 1,5 < 1,0
Null leakage flow1) total max. (~ critical lap) [l/min] 3 / 4,5 4,5 / 4,5 / 4,5
Pilot leakage flow1) Pilot stage only [l/min] 1,7 1,7
Pilot flow1) max, for 100 % step input [l/min] 1,7 1,7
Temperature range Ambient [°C] –20 to 60
Fluid [°C] –20 to 80
Operating fluid2) mineral oil based hydraulic fluid
(DIN 51524, part 1 to 3),
other fluids on request
Viscosity recommended [mm²/s] 15 to 45
allowable [mm²/s] 5 to 400
Cleanliness class
ISO 4406:1999 for normal operation 19 / 16 / 13
for longer life3) 17 / 14 / 11
3 Technical Data
3.1 Technical data of servo valve D661K Series
1) At 210 bar pilot or operating pressure, fluid viscosity 32 mm²/s
and fluid temperature of 40°C
2) The cleanliness of the hydraulic fluid greatly influences the
functional safety and the wear and tear of the valve. In order to
avoid malfunctions and increased wear and tear, we recommend
filtrating the hydraulic fluid accordingly.
3) For long life wear protection of metering lands
For additional technical information , such
as dimensions, ordering information etc.
see the catalogue.

8 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
D661K Series
Model ... Type D661K...3... D661K...8...
Mounting pattern according to ISO ISO 4401-05-05-0-05 ISO 4401-05-05-0-05
(D661K Series with additional 2nd T-port)
Valve version 4-way, 2x2-way, 5-way 4-way, 2x2-way, 5-way
2-stage, standard spool 2-stage, standard spool
Pilot stage D061K Jetpipe Standard High Flow
Pilot connection Optional, internal or external X and Y X and Y
Mass [kg] 5,6 5,6
Rated Flow QN(±10 %) at ∆pN= 5 bar per land [l/min] 30 / 60 / 80 / 2 x 80 30 / 60 / 80 / 2 x 80
Maximum operating pressure pmax.
Main stage ports P, A, B [bar] 350 350
port T with Y internal [bar] 20 % of pilot pressure, max. 100 bar
port T with Y external [bar] 350 350
Pilot stage regular version [bar] 210 210
with dropping orifice (on request) [bar] 350 350
Response time1) for 0 to 100 % stroke [ms] 28 18
Threshold1) [%] < 0,1 < 0,1
Hysteresis1) [%] < 0,5 < 0,5
Null shift with ∆T = 55 K [%] < 1,0 < 1,0
Null leakage flow1) total max. (~ critical lap) [l/min] 3,5 4,4
Pilot leakage flow1) Pilot stage only [l/min] 1,7 2,6
Pilot flow1) max, for 100 % step input [l/min] 1,7 2,6
Temperature range Ambient [°C] –20 to 60
Fluid [°C] –20 to 80
Operating fluid2) mineral oil based hydraulic fluid
(DIN 51524, part 1 to 3),
other fluids on request
Viscosity recommended [mm²/s] 15 to 45
allowed [mm²/s] 5 to 400
Cleanliness class
ISO 4406:1999 for normal operation 19 / 16 / 13
for longer life 3) 17 / 14 / 11
3.2 Technical Data Proportional valve D661K Series
1) At 210 bar pilot or operating pressure, fluid viscosity 32 mm²/s
and fluid temperature of 40°C
2) The cleanliness of the hydraulic fluid greatly influences the
functional safety and the wear and tear of the valve. In order to
avoid malfunctions and increased wear and tear, we
recommend filtrating the hydraulic fluid accordingly.
3) For long life wear protection of metering lands
For additional technical information, such
as dimensions, ordering information etc.
see the catalogue.

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 9
D662K, D663K and D664K Series
D662K..D..3... D662K..D..8... D663K..L..8... D664K..L..8...
ISO 4401-07-07-0-05 ISO 4401-07-07-0-05 ISO 4401-08-08-0-05 ISO 4401-08-08-0-05
4-way, 2x2-way 4-way, 2x2-way 4-way, 2x2-way 4-way, 2x2-way
2-stage, stub shaft spool 2-stage, stub shaft spool 2-stage, stub shaft spool 2-stage, stub shaft spool
Standard High Flow High Flow High Flow
X and Y X and Y X and Y X and Y
11 11 19 19
150 / 250 150 / 250 350 550
350 350 350 350
20 % of pilot pressure, max. 100 bar
350 350 350 350
210 210 210 210
350 350 350 350
44 28 37 48
< 0,1 < 0,1 < 0,1 < 0,1
< 0,5 < 0,5 < 0,5 < 0,5
< 1,0 < 1,0 < 1,0 < 1,0
4,2 5,1 5,6 5,6
1,7 2,6 2,6 2,6
1,7 2,6 2,2 2,6
–20 to 60
–20 to 80
mineral oil based hydraulic fluid
(DIN 51524, part 1 to 3),
other fluids on request
15 to 45
5 to 400
19 / 16 / 13
17 / 14 / 11
Technical Data D662K, D663K and D664K Series

10 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
4 Installation
4.1 General Information
4.1.1 Compare model number and valve type with information
from the hydraulic schematic or bill of material.
4.1.2 The valve can be mounted in any direction, fixed or
movable.
4.1.3 Check mounting surface for flatness (0,02 mm for 100 mm)
and surface roughness (Ra <1 µm)
4.1.4 Pay attention to cleanliness of mounting surfaces and
surroundings when installing the valve.
4.1.5 Use lint-free tissue to clean!
4.1.6 Before installation, remove protection plate from the valve
and replace it when the valve removed.
4.1.7 Pay attention to correct position of ports and location of
o-rings during installation.
D661K... 05-05-0-05 M6 x 60 4 13
D662K... 07-07-0-05 M10 x 60 4 65
M6 x 55 2 13
D663K... 08-08-0-05 M12 x 75 6 110
D664K... 08-08-0-05 M12 x 75 6 110
Series Socket head
screws Qty. Torque [Nm]
Mounting
pattern
ISO 4401
D661K, D662K, D663K and D664K Series
4.1.8 Use socket head screws according to DIN EN ISO 4762
(hitherto DIN 912) for mounting, strength class 10.9, and
tighten them diagonally according to following table.
Torque tolerance ±10 %.
4.2 Dimensions
4.2.1 Proportional or Servo valves D661K Series
shown without optional hydraulic fail safe valve

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 11
D661K, D662K, D663K and D664K Series
4.2.2 D662K Series with optional hydraulic fail safe valve
4.2.3 D663K and D664K Series shown without optional hydraulic
fail safe valve

12 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
Input command I4-5: 0 to ±10 mA
Input command (inverted) I4-5: 0 to ±10 mA
Inputs U4-2 and U5-2 for both signal types limited to: min. –15 V and max. 32 V
Function Current command Voltage command
Supply 24 VDC (min. 18 VDC, max. 32 VDC) Imax.: 300 mA
Supply or signal ground ⊥(0 V)
Enabled 1) U3-2 > 8,5 VDC
Not enabled U3-2 < 6,5 VDC
PE (protective earth) /
FE (functional earth)
For valves with 6+PE/6+FE-pole connection lead
Output actual value
spool position
U4–5 : 0 to ±10 V
Re: 10 kΩ
Input rated command
(differential)
Ie= 1,2 mA at 24 VDC
4.3.2.5 Connection lead wiring - type code letter K/H (see sticker on the electronic housing)
1) With enable signal <6,5 V the spool moves into the defined position.
D661K, D662K, D663K and D664K Series
4.3 Electronics information
4.3.1 Connection lead
Please note information regarding input signals on the
nameplate!
Number of poles Supply voltage 24 VDC
6+PE / 6+FE X
11+PE X
4.3.2 Valve electronics with supply voltage 24 Volt
and 6+PE/6+FE-pole connecting lead
4.3.2.1 Flow command input
±10 mA, floating
The spool stroke of the valve is proportional to I4 = –I5. 100 %
valve opening P ¶A and B ¶T is achieved at I4= 10 mA.
At 0 mA command the spool is in centred position.
The input flexible wire 4 and 5 are inverting. Either flexible
wire 4 or 5 is used according to the required operating
direction. The other flexible wire is connected to signal
ground at cabinet side.
4.3.2.2 Flow command input
±10 V, floating
The spool stroke of the valve is proportional to (U4 – U5). 100 %
valve opening P ¶A and B ¶T is achieved at (U4 – U5) = 10 V.
At 0 V command the spool is in centred position.
The input stage is a differential amplifier. If only one
command signal is available, flexible wire 4 or 5 is connected
to signal ground at cabinet side, according to the required
operating direction.
4.3.2.4 Flow actual value output 4 to 20 mA
The actual spool position value can be measured at flexible
wire 6 (see diagram on page 13). This signal can be used
for monitoring and fault detection purposes.
The spool stroke range corresponds to 4 to 20 mA.
The centred position is at 12 mA. 20 mA corresponds to
100 % valve opening P ¶A and B ¶T.
4.3.2.4 Flow actual value output 2,5 to 13,5 V
The actual spool position value can be measured at flexible
wire 6 (see diagram on page 13). This signal can be used
for monitoring and fault detection purposes.
The spool stroke range corresponds to 2,5 to 13,5 V. The
centred position is at 8 V. 13,5 V corresponds to 100 %
valve opening P ¶A and B ¶T.
(Re= 200 Ω)
I6-2 = 4 to 20 mA. At 12 mA spool is in centred position. RL= 100 to 500 Ω
Signal code D: U6-2 = 2,5 to 13,5 V. At 8 V spool is in centred position. Ra = 500 Ω
General requirements
USupply 24 VDC, min.18 VDC, max. 32 VDC.
Current consumption max. 300 mA
UAll signal lines, also those of external transducers, shielded.
UShielding connected radially to ⊥(0V), power supply side, and
connected to the mating connector housing (EMC)
UEMC: Meets the requirements of EN 61000-6-4:2007 and
EN 61000-6-2:2006.
UProtective grounding lead ≥0,75 mm2
UNote: When making electric connections to the valve (shield,
protective earth) appropriate measures must be taken to ensure
that locally different earth potentials do not result in excessive
ground currents.
See also Technical Note TN 353.
UAll connected electric circuits must be isolated from the main
supply by safety isolation according to EN 61558-1 and
EN 61558-2-6. Voltages must be limited to the safety extra low
voltage range according to EN 60204-1. We recommend the use
of SELV/PELV power supplies.
/ 7

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 13
4.3.3 Valve electronics with supply voltage 24 Volt
and 11+PE-pole connecting lead
4.3.3.1 Flow command input
±10 mA, floating
The spool stroke of the valve is proportional to I4 = –I5. 100 %
valve opening P ¶A and B ¶T is achieved at I4= 10 mA.
At 0 mA command the spool is in centred position.
The input flexible wire 4 and 5 are inverting. Either flexible
wire 4 or 5 is used according to the required operating
direction. The other flexible wire is connected to signal
ground at cabinet side.
4.3.3.2 Flow command input
±10 V, floating
The spool stroke of the valve is proportional to (U4 – U5). 100 %
valve opening P ¶A and B ¶T is achieved at (U4 – U5) = 10 V.
At 0 V command the spool is in centred position.
The input stage is a differential amplifier. If only one
command signal is available, flexible wire 4 or 5 is connected
to signal ground at cabinet side, according to the required
operating direction.
4.3.3.4 Flow actual value output 4 to 20 mA
The actual spool position value can be measured at flexible
wire 6 (see diagram on page 13). This signal can be used
for monitoring and fault detection purposes.
The spool stroke range corresponds to 4 to 20 mA.
The centred position is at 12 mA. 20 mA corresponds to
100 % valve opening P ¶A and B ¶T.
Circuitdiagramformeasure-
ment of actual value I6-2
(position of main spool)
Output Imax.: 20 mA
Ausgang Imax: 20 mA
U8-2 > 8,5 VDC: Enable and supply ok
U8-2 < 6,5 VDC: Not enableed or supply not ok
U11-2 > 8,5 VDC: <30 %
U11-2 < 6,5 VDC: >30 %
PE (protective earth)
Enabled 1) U3-2 > 8,5 VDC
Not enabled U3-2 < 6,5 VDC
Supply 24 VDC (min. 18 VDC, max. 32 VDC) Imax.: 300 mA
Supply or signal ground ⊥(0 V)
Input rated command
(differential)
not used
not used
Soll-Istwert-Abweichung
For valves with 11+PE-pole connection lead
Valve ready
Supply ready
Ie= 1,2 mA at 24 VDC
4.3.3.5 Connection lead wiring - type code letter Z(see sticker on the electronic housing)
1) With enable signal < 6,5 V the spool moves into the defined position.
D661K, D662K, D663K and D664K Series
Function Current command Voltage command
Output actual value
spool position
Auxiliary signal Spool position I7-2 = 13 to 3 V. At 8 V spool is in centred position. Ra= 5 kΩ
Position error, logic Output Imax.: 20 mA
U11-2 > 8,5 VDC: safe position
U11-2 < 6,5 VDC: not in safe position
Please note "General requirements" on page 12.
Input command I4-5: 0 to ±10 mA
Input command (inverted) I4-5: 0 to ±10 mA
Inputs U4-2 and U5-2 for both signal types limited to: min. –15 V and max. 32 V
(Re= 200 Ω)U4–5 : 0 to ±10 V
Re: 10 kΩ
I6-2 = 4 to 20 mA. At 12 mA spool is in centred position. RL= 100 to 500 Ω
Signal code D: U6-2 = 2,5 to 13,5 V. At 8 V spool is in centred position. Ra = 500 Ω

14 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
6 Maintenance
Apart from a regular visual check for external leaks or
damaged cables and a change of filter, no maintenance
work is necessary on the series D661K to D664K valves.
Explosion protected valves D661K.../D662K.../D663K...
and D664K... must not be opened by the customer
under any circumstances.
Unauthorized opening will invalidate the explosion-
proof approval! Return failed valve to the factory.
These explosion protected valves can only be repaired
at the Moog GmbH service office (see address on the
back of the operating instructions).
6.1 Filter replacement
The built-in filter disk protects jet and receiver against coarse
contaminants. With severe contamination the valve res-
ponse will be reduced.
Replace filter!
Cleaning is useless and may be dangerous!
Before starting to work on the valve clean the external
surface around the filter cover!
6.1.1 Dismantle the four hexagon socket screws (3) with the SW3
hexagon socket screw key and remove the filter cover (1).
6.1.2 Pull out the filter plug (2), which is now accessible, with
the help of one of the screws (3) by means of the M4 thread.
6.1.3 Remove the filter disk (5) with a scriber or a fine screwdriver.
Do not reinsert used filter disks.
6.1.4 Check O-rings (4.1) and (4.2) and replace them if necessary. Pay
attention to the correct material for the O-ring, NBR or FPM.
6.1.5 Insert the new filter disk. For this, firstly insert the O-ring
(4.2), then the filter disk (5) in such a way that the side
with the impression points towards the outside. Insert
O-ring (4.1) in the filter plug with some clean grease and
insert the filter plug (2) in the bore.
6.1.6 Assemble cover (1) with the four M4 hexagon socket screws
(3) and tighten with a torque of 4,1 Nm.
6.1.7 After putting the valve into operation, check it for external
leaks.
D661K, D662K, D663K and D664K Series
5 Setting up
This information is valid for new installations to be put into operation
as well as for valve replacement.
5.1 Filling the hydraulic system
New oil is never clean. Therefore the system should generally
be filled by using a filling filter.This fine mesh filter should at
least comply with the following requirement:
β10 ≥75 (10 µm absolute).
5.2 Flushing the hydraulic system
Before the hydraulic system is put into operation for the
first time (also after modifications) it has to be flushed care-
fully according to the instructions of the manufacturer of
the machine/plant.
5.2.1 Before flushing suitable flushing elements have to be inserted
in the pressure filters instead of the high pressure elements.
5.2.2 During flushing the operational temperature of the hydrau-
lic system should be achieved. Observe temperature!
5.2.3 A flushing plate or, if the system allows, a directional valve
should be mounted in place of the proportional valve. The
P- and T-connections are flushed through the flushing plate.
The user A- and B-connections can also be flushed by the
directional valve.
Attention, the directional valve can lead to unpermissable
movements in the load (i.e., with parallel drives), which
may result in damage to the machine/plant. Instructions of
the manufacturer have to be strictly observed.
Minimum flushing time t can be calculated as follows:
5.2.4 The flushing process can be considered completed when a
system cleanliness of 19/16/13 according ISO 4406:1999
or better is achieved. A long life of the metering lands of
the proportional valve can be expected for this cleanliness
class.
5.2.5 Replace flushing elements in the pressure filters by suitable
high pressure elements after flushing. Install proportional
valve instead of flushing plate or directional valve.
5.3 Setting up
5.3.1 After setting up the valves, put the machine or system into
operation, observing the operating instructions of the
machine/plant manufacturer. Vent the system.
5.3.2 The safety directives of the machine/plant manufacturer
must be observed (EN 954-1).
In particular, the safety requirements to IEC 60079-1 and
IEC 60079-7 apply.
The special safety requirements for machines such as in
jection moulding machines (EN 201), blow moulding
machines (EN 422) and die casting machines (EN 869), to
name a few, are important.
5.3.3 Observe the oil temperature.
5.3.4 Check the hydraulic system for external leaks.
V = content of reservoir [liter]
Q = flow rate of the pump [l/min]
t = flushing time [hours]
5·
Q
V
t =

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 15
7 Malfunctions – Causes and
Troubleshooting
7.1 Leakage at the mounting surface of the valve
UHave all seals been installed at ports A, B, P, T, (T2),
Y and X and are they ok?
UHave the mounting bolts been tightened correctly?
Pay attention to the required torque!
Tighten bolts diagonally!
7.2 No hydraulic response of the valve
UCheck all signals at the flexible wires.
UIs supply voltage present?
UIs electric input signal (command signal) present?
UIs the enable signal > 8,5 V at flexible wire 3 present?
UIs hydraulic pressure present?
UCheck pilot supply. Do you need internal or external?
UIf external, is pilot pressure present?
UIs the filter disk contaminated?
With failsafe version:
UIs the release pressure Zavailable on the 2/2-way
solenoid valve?
7.3 Instability of the system, plant oscillates
UCheck, whether output signal at flexible wire 6 is following
exactly the command signal at flexible wire 4 or 5.
If not, the electronics of the valve may be defective.
UCheck filter disk for contamination.
7.4 With hydraulics ON valve goes hardover
UHas the fail safe directional seat valve been actuated?
UPilot stage is contaminated.
Send the valve back to the Moog GmbH service
office for repairs.
D661K, D662K, D663K and D664K Series
9 Tools
9.1 Tools and ancillaries
The following tools are required for installation, start of
operation, zeroing and changing filters:
9.1.1 Installation of the valve
9.1.1.1 To fit the valve:
Allan wrench SW 5 for D661K
Allan wrench SW 5 and SW8 for D662K
Allan wrench SW 10 for D663K and D664K
9.1.2 Filter replacement
9.1.3.1 For dismantling and fitting the filter cover:
Allan wrench SW 3
9.1.3.2 For dismantling the filter disk, a scriber or a fine electronic
engineer’s screwdriver is recommended.
9.1.3.3 For inserting the O-ring on the filter cover and also in the
installation of the O-rings on the assembly surface, clean
grease is required.
Standard grease must not be used with valve models having
EPDM seals. Use special grease!
8 Declaration of conformity
A declaration of conformity as defined by machinery directive
89/392/EEC Annex II B and directive IEC 60079 is issued for servo
and proportional valves D661K, D662K, D663K and D664K Series
and is shown in this operating instructions.

16 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
10.1 Spare parts Jetpipe pilot stage D061K
1) see sketch capter 6.1, Filter replacement, on page 14
D661K, D662K, D663K and D664K Series
10.2 Spare parts D661K
Part No. Description Dimensions Material Qty.
-45122-004 O-ring, ports P, T, A, B, T2ID 12,4 x Ø 1,8 NBR Sh 85 5 pcs.
-42082-004 O-ring, ports P, T, A, B, T2ID 12,4 x Ø 1,8 FPM Sh 85 5 pcs.
-45122-011 O-ring, ports X and Y ID 15,6 x Ø 1,8 NBR Sh 85 2 pcs.
-42082-011 O-ring, ports X and Y ID 15,6 x Ø 1,8 FPM Sh 85 2 pcs.
10.3 Spare parts D662K
Part No. Description Dimensions Material Qty.
-45122-129 O-ring, ports P, T, A, B ID 21,89x Ø 2,6 NBR Sh 85 4 pcs.
-42082-129 O-ring, ports P, T, A, B ID 21,89x Ø 2,6 FPM Sh 85 4 pcs.
-45122-022 O-ring, ports X and Y ID 10,82x Ø 1,8 NBR Sh 85 2 pcs.
-42082-022 O-ring, ports X and Y ID 10,82x Ø 1,8 FPM Sh 85 2 pcs.
10.4 Spare parts D663K and D664K
Part No. Description Dimensions Material Qty.
-45122-113 O-ring, ports P, T, A, B ID 34,6 x Ø 2,6 NBR Sh 85 4 pcs.
-42082-113 O-ring, ports P, T, A, B ID 34,6 x Ø 2,6 FPM Sh 85 4 pcs.
-45122-195 O-ring, ports X and Y ID 20,29x Ø 2,6 NBR Sh 85 2 pcs.
-42082-195 O-ring, ports X and Y ID 20,29x Ø 2,6 FPM Sh 85 2 pcs.
10 Spare Parts and Accessories
Part No. Description Pos. 1) Dimensions Material Qty.
-45122-004 O-ring, ports P, T, A, B ID 12,4 x Ø 1,8 NBR Sh 85 4 pcs.
-42082-004 O-ring, ports P, T, A, B ID 12,4 x Ø 1,8 FPM Sh 85 4 pcs.
A67999-200 Replaceable filter disk 200 µm nominal 1 pc.
-66117-013-015 O-ring, on filter stuffing and behind filter disk 4.1 and 4.2 ID 15,6 x Ø 1,8 NBR Sh 85 2 pcs.
A25163-013-015 O-ring, on filter stuffing and behind filter disk 4.1 and 4.2 ID 15,6 x Ø 1,8 FPM Sh 85 2 pcs.

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 17
10.5 Accessories (not included in delivery)
Part No. Description Dimensions/Notes Qty.
A03665-060-060 Mounting bolts D661K... M6x60 DIN EN ISO 4762-10.9 4 pcs.
A03665-100-060 Mounting bolts D662K... M10x60 DIN EN ISO 4762-10.9 4 pcs.
A03665-060-055 Mounting bolts D662K... M6x55 DIN EN ISO 4762-10.9 2 pcs.
A03665-120-075 Mounting bolts D663K... M12x75 DIN EN ISO 4762-10.9 6 pcs.
A03665-120-075 Mounting bolts D664K... M12x75 DIN EN ISO 4762-10.9 6 pcs.
Mounting manifolds D661K... see special data sheet
B46891-001 Mounting manifold D662K...
A25855-009 Mounting manifold D663K...
A25855-009 Mounting manifold D664K...
B67728-001 Flushing plate D661K...
B67728-002 Flushing plate D661K...
B67728-003 Flushing plate D661K...
-76741 Flushing plate D662K...
-76047-001 Flushing plate D663K... / D664K...
-76047-002 Flushing plate D663K... / D664K...
D661K, D662K, D663K and D664K Series

18 Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) © 2007 Moog GmbH
   
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G



D661
Model designation
assigned at the factory
Factory identification
Pilot stage
3D061K Jetpipe Standard
Maximum operating pressure
B70 bar
F210 bar At pX ≤210 bar (X and Y external) operating pressure in
ports P, A, B and T up to 350 bar allowed
K350 bar (with dropping orifice in pilot valve)
XSpecial version
Rated flow
QN [l/min] at ∆pN
70 bar 10 bar
15 40 15
30 80 30
45 120 45
60 160 60
75 200 75
Valve version
Gbushing
Specification status
KExplosion proof version
Type designationModel number
Valve connection lead
K6+PE-pole (protective earth) 1)
H6+FE-pole (functional earth), mud resistant 1)
Seal material
NNBR Standard
VFPM optional
Others on request
Signals for 100 % spool stroke
Command Output
D±10 V 2 to 10 V
M±10 V 4 to 20 mA
X±10 mA 4 to 20 mA
Pilot connections
Supply Return
4internal internal
5external internal
6external external
7internal external
Spool position without electric supply
Oundefined (no fail safe function)
Mechanical fail safe versions achieved at
AP ¶B, A ¶T connected pX> 25 bar
BP ¶A, B ¶T connected pX> 25 bar
Bushing spool type
O4-way: critical lap, linear characteristic
S4-way: critical lap, curvilinear characteristic, > QN= 80 l/min
Xspecial bushing on request
11 Ordering Information
11.1 Servo valve D661K
D661K Series
K 
Electric supply
224 VDC (18 to 32 VDC)
Function code
ONot enable input. Flexible wire 3 not used.
AWithout enable signal applied the spool
moves to adjustable centred position.
BWithout enable signal applied the spool moves
into defined end position A ¶T oder B ¶T.
2–
Parameters of the control electronics
are adapted to the pilot pressure.
See operating pressure on the name-
plate and in this ordering information.

1) Cable's length 3 m, other lengths on request
Preferred configurations are highlighted.
Technical changes are reserved.
Options may increase price.
All combinations may not be available.

© 2007 Moog GmbH Operating Instructions D661K, D662K, D663K and D664K (CA49305-001; Version 3.0, 10/07) 19
D661K, D662K, D663K and D664K Series
Options may increase price.
All combinations may not be available.
Preferred configurations are highlighted.
Technical changes are reserved.
    2

  
D661 to D664
Model designation
assigned at the factory
Factory identification
Pilot stage
3D061K Jetpipe Standard
8D061K Jetpipe High flow
Maximum operating pressure
B70 bar
F210 bar At pX≤210 bar (X and Y external) operating pressure in
ports P, A, B and T up to 350 bar allowed
K350 bar (with dropping orifice in pilot valve)
XSpecial version
Rated flow
QN [l/min] at ∆pN= 5 bar per land Series
30 30 D661K
60 60 D661K
80 80 D661K
01 150 D662K
02 250 D662K
03 350 D663K
05 550 D664K
Ventil version Series
PStandard spool D661K to D664K
BStandard spool D661K (5-way)
DStub shaft spool 16 mm dia D662K
LStub shaft spool 19 mm dia D663K and 664K
Specification status
KExplosion proof version
Type designationModel number
1) Cable's length 3 m, other lengths on request
2)P
Z: Pressure for 2/2-way fail safe valve
Electric supply
224 VDC (18 to 32 VDC)
Valve connection lead for electric supply
Z11+PE-pole 1)
K6+PE-pole (protective earth) 1)
H6+FE-pole (functional earth), mud resistant 1)
Seal material
NNBR Standard
VFPM optional
Others on request
Signals for 100 % spool stroke
Input Output Cable
A±10 V ±10 V (diff.) Z
D±10 mA 2 to 10 V (at 6 V mid position) Z/K/H
F±10 V 2,5 to 13,5 V K/H
M±10 V 4 to 20 mA Z/K/H
T±10 V 4 to 20 mA with deadband compensation K/H
X±10 mA 4 to 20 mA Z/K/H
YOthers on request
Pilot connections
Supply X Return Y
4internal internal
5external internal
6external external
7internal external
Spool position of main stage with/without electric or hydraulic supply
Oundefined (no fail safe function) for all valve types
Mechanical fail safe version without electric supply of main stage
Position pPor pXexternal [bar] for valves with pilot stage
FP ¶B and A ¶T ≥25 3 and 8
<1 3 and 8
DP ¶A and B ¶T ≥25 3 and 8
<1 3 and 8
MMid position defined ≥1<1 3 and 8
Mid position undefined ≥1≥15 3 and 8
Hydraulically controlled fail safe version
Position pP [bar] pZ [bar]2) pX [bar] Valve electronics
HP ¶B and A ¶T >1<1≥15 on / off
P ¶B and A ¶T >1≥15 <1 on / off
P ¶B and A ¶T >1≥15 ≥15 off
KMid position defined >1<1≥15 on / off
Mid position undefined >1≥15 <1 on / off
undefined >1≥15 ≥15 off
Main spool type
A4-way: ~ critical lap, linear characteristic
D4-way: 10 % overlap, linear characteristic
P4-way: P ¶A, A ¶T: ~ critical lap, curvilinear characteristic
P ¶B: 60 % overlap, curvilinear characteristic
B ¶T: 50 % underlap, linear characteristic
U5-way: P ¶A, P2 ¶B, A ¶T: ~critical lap, curvilinear characteristic (D661 only)
Y4-way: ~ critical lap, curvilinear characteristic
Z2x2-way: A ¶T, B ¶T2: ~ critical lap, linear characteristic
XSpecial spool on request
Parameters of the control electronics are
adapted to the pilot pressure.
See operating pressure on the nameplate
and in this ordering information.

Funktionskennung Cable
ONot enable input. Flexible wire 3 not used. K/H
AWithout enable signal applied the spool K/H
moves to adjustable centred position.
BWithout enable signal applied the spool K/H
moves into defined end position A ¶T or B ¶T.
EWithout enable signal applied the spool Z
moves to adjustable centred position.
Position error monitored.
FWithout enable signal applied the spool Z
moves into defined end position A ¶T or B ¶T.
Position error monitored.
11.2 Proportional valves D661K to D664K

K

CA49305-002; Version 3.0, 10/07
All rights reserved. Changes are reserved.
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Moog GmbH
Hanns-Klemm-Straße 28
71034 Böblingen, Germany
Telephone: [phone]
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E-mail: [email protected]
Internet: www.moog.com