Woodward EG-6P User manual

Product Manual 82566
(Revision U, 1/2019)
Original Instructions
EG-6P, EG-6PC, EG-10P, EG-10PC
Actuators
Proportional and Proportional with Compensation
Oil Pump and Oil Motor Models
Installation and Operation Manual
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General
Precautions
Read this entire manual and all other publications pertaining to the work to be
performed before installing, operating, or servicing this equipment.
Practice all plant and safety instructions and precautions.
Failure to follow instructions can cause personal injury and/or property damage.
Revisions
This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual 26455, Customer
Publication Cross Reference and Revision Status & Distribution Restrictions, on
the publications page of the Woodward website:
www.woodward.com/publications
The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.
Proper Use
Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or
property damage, including damage to the equipment. Any such unauthorized
modifications: (i) constitute "misuse" and/or "negligence" within the meaning of
the product warranty thereby excluding warranty coverage for any resulting
damage, and (ii) invalidate product certifications or listings.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26455, Customer Publication
Cross Reference and Revision Status & Distribution Restrictions, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Revisions—Changes in this publication since the last revision are indicated by a black line
alongside the text.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is
believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly
undertaken. Manual 82566
Copyright © Woodward 1983–2019
All Rights Reserved
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Manual 82566 EG-6P/PC, EG-10P/PC Actuator
Woodward 1
Contents
WARNINGS AND NOTICES...........................................................................3
ELECTROSTATIC DISCHARGE AWARENESS .................................................4
REGULATORY COMPLIANCE .......................................................................5
CHAPTER 1. GENERAL INFORMATION..........................................................7
Description..............................................................................................................7
Governor System....................................................................................................7
References .............................................................................................................8
Specifications .........................................................................................................8
CHAPTER 2. INSTALLATION ......................................................................11
Storage.................................................................................................................11
Installation.............................................................................................................11
EG-6P, EG-10P Actuator (with Compensation) ...................................................12
Oil Supply .............................................................................................................13
CHAPTER 3. PRINCIPLES OF OPERATION...................................................20
Introduction...........................................................................................................20
Oil Pump Model....................................................................................................20
Oil Motor Model ....................................................................................................21
Voltage Change....................................................................................................22
Compensation System .........................................................................................22
CHAPTER 4. TROUBLESHOOTING..............................................................24
CHAPTER 5. REPLACEMENT PARTS ..........................................................26
Parts Information..................................................................................................26
Parts For Figure 5-1 .............................................................................................26
Parts For Figure 5-2 .............................................................................................29
CHAPTER 6. PRODUCT SUPPORT AND SERVICE OPTIONS...........................32
Product Support Options......................................................................................32
Product Service Options.......................................................................................32
Returning Equipment for Repair...........................................................................33
Replacement Parts...............................................................................................33
Engineering Services............................................................................................34
Contacting Woodward’s Support Organization ....................................................34
Technical Assistance............................................................................................35
REVISION HISTORY ..................................................................................36
DECLARATIONS .......................................................................................37
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Illustrations and Tables
Figure 2-1. Oil Viscosity Chart..............................................................................14
Figure 2-2. Outline Drawing of Typical EG-P Actuator (Oil Pump Model)............15
Figure 2-3. Outline Drawing of Typical EG-P Actuator (Oil Motor Model)............16
Figure 2-4. Outlines of Typical Applications.........................................................17
Figure 2-5. Oil Pump Rotation Plugs....................................................................18
Figure 2-6. EG-10P Oil Pump Actuator................................................................19
Figure 3-1. EG-P Schematic.................................................................................21
Figure 3-2. EG-P Compensation System.............................................................23
Figure 4-1. Wiring Diagram for Circuit to Test Actuator Output ...........................25
Figure 5-1. Parts for the EG Actuator (Oil Motor Model)......................................28
Figure 5-2. Parts for the EG-P Actuator (Oil Pump Model)..................................31
Table 1-1. Governor Oil Pressure vs Maximum Work Output................................7
Table 2-1. Orifice Size for Oil Motor Supply Pressure..........................................14
The following are trademarks of Woodward, Inc.:
EG-6P, EG-6PC, EG-10P, EG-10PC
The following are trademarks of their respective companies:
Kearfott (Kearfott Corporation)
Pickering (Pickering Interfaces Ltd)
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Warnings and Notices
Important Definitions
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
DANGER—Indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING—Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION—Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE—Indicates a hazard that could result in property damage only
(including damage to the control).
IMPORTANT—Designates an operating tip or maintenance suggestion.
Overspeed /
Overtemperature /
Overpressure
The engine, turbine, or other type of prime mover should be
equipped with an overspeed shutdown device to protect against
runaway or damage to the prime mover with possible personal injury,
loss of life, or property damage.
The overspeed shutdown device must be totally independent of the
prime mover control system. An overtemperature or overpressure
shutdown device may also be needed for safety, as appropriate.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage. Always
wear the appropriate personal protective equipment (PPE) for the job
at hand. Equipment that should be considered includes but is not
limited to:
Eye Protection
Hearing Protection
Hard Hat
Gloves
Safety Boots
Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
Start-up
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
Automotive
Applications
On- and off-highway Mobile Applications: Unless Woodward's control
functions as the supervisory control, customer should install a
system totally independent of the prime mover control system that
monitors for supervisory control of engine (and takes appropriate
action if supervisory control is lost) to protect against loss of engine
control with possible personal injury, loss of life, or property damage.
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Battery Charging
Device
To prevent damage to a control system that uses an alternator or
battery-charging device, make sure the charging device is turned off
before disconnecting the battery from the system.
Electrostatic Discharge Awareness
Electrostatic
Precautions
Electronic controls contain static-sensitive parts. Observe the
following precautions to prevent damage to these parts:
Discharge body static before handling the control (with power to
the control turned off, contact a grounded surface and maintain
contact while handling the control).
Avoid all plastic, vinyl, and Styrofoam (except antistatic versions)
around printed circuit boards.
Do not touch the components or conductors on a printed circuit
board with your hands or with conductive devices.
To prevent damage to electronic components caused by improper
handling, read and observe the precautions in Woodward manual
82715, Guide for Handling and Protection of Electronic Controls,
Printed Circuit Boards, and Modules.
Follow these precautions when working with or near the control.
1. Avoid the build-up of static electricity on your body by not wearing clothing
made of synthetic materials. Wear cotton or cotton-blend materials as much
as possible because these do not store static electric charges as much as
synthetics.
2. Do not remove the printed circuit board (PCB) from the control cabinet
unless absolutely necessary. If you must remove the PCB from the control
cabinet, follow these precautions:
Do not touch any part of the PCB except the edges.
Do not touch the electrical conductors, the connectors, or the
components with conductive devices or with your hands.
When replacing a PCB, keep the new PCB in the plastic antistatic
protective bag it comes in until you are ready to install it. Immediately
after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.
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Woodward 5
Regulatory Compliance
The listings in this section are limited to EG-10P units.
European Compliance for CE Marking:
These listings are limited only to those units bearing the CE Marking.
ATEX –Potentially Directive 2014/34/EU on the harmonization of the
Explosive laws of the Member States relating to equipment
Atmospheres and protective systems intended for use in
Directive: potentially explosive atmospheres.
Zone 1, Category 2, Group IIG Ex e II T6
TUV 15 ATEX 7717X
Other European and International Compliance:
Compliance with the following European Directives or standards does not qualify
this product for application of the CE Marking.
ATEX Directive: Exempt from the non-electrical portion of the ATEX
Directive 2014/34/EU due to no potential ignition
sources per EN 13463-1:2009 Category 2.
Pressure Compliant as “SEP” per Article 4.3 to Pressure
Equipment Equipment Directive 2014/68/EU on the
Directive: harmonization of the laws of the Member States
relating to the making available on the market of
pressure equipment.
Machinery Compliant at partly completed machinery with
Directive: Directive 2006/42/EC of the European Parliament
and the Council of 17 May 2006 on machinery.
IECEx: Certified for use in hazardous locations IECEx TUR
15.0024X
Ex e IIC T4 Gb
North American Compliance:
CSA: CSA Certified for Class I, Division 2, Groups B, C, D,
T3 For use in Canada
Certificate LR 38640-4
UL: UL Listed for Class I, Division 1, Groups B, C, D, T3.
For use in the United States.
UL File E49265
UL: UL Listed for Class I, Division 2, Groups B, C, D, T3.
For use in the United States.
UL File E158654
These hazardous locations listings are limited to those units bearing
the UL, CSA, or LCIE agency identification, specific hazardous
locations markings, and the CE marking. If the unit will be used in
hazardous locations, refer to the product nameplate or contact your
Woodward account manager for more information.
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The EG-10P actuator is suitable for use in Class I, Division 1, Groups B, C, and
D per UL for the US or non-hazardous locations only.
The EG-10P actuator is suitable for use in Class I, Division 2, Groups B, C, and
D per UL for the US or non-hazardous locations only.
The EG-10P actuator is suitable for use in Class I, Division 2, Groups B, C, and
D per CSA for Canada and UL for the US or non-hazardous locations only.
The EG-10P is suitable for use in European Zone 2, Groups A, B, C, and D
environments.
The EG-10P is suitable for use in European Zone 1, Groups A, B, C, and D
environments per LCIE.
Wiring must be in accordance with North American Class I, Division 1 or 2 or
European Zone 1 or 2 wiring methods as applicable, and in accordance with the
authority having jurisdiction.
Field Wiring must be suitable for at least 90 °C.
Connect ground terminal to earth ground.
Each EG-10P Zone 1 actuator must be provided with a 900 mA maximum fuse to
be installed before the actuator.
EXPLOSION HAZARD—Do not remove covers or connect/disconnect
electrical connectors unless power has been switched off or the area
is known to be non-hazardous.
Substitution of components may impair suitability for Class I,
Division 2 or Zone 2.
RISQUE D’EXPLOSION—Ne pas enlever les couvercles, ni
raccorder / débrancher les prises électriques, sans vous en
assurez auparavant que le système a bien été mis hors
tension; ou que vous vous situez bien dans une zone non
explosive.
La substitution de composants peut rendre ce matériel
inacceptable pour les emplacements de Classe I, Division 2
ou de Zone 2.
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Chapter 1.
General Information
Description
The controlling element of the EG-6 and EG-10 Proportional Actuators is an
electrohydraulic transducer which controls oil flow to and from the power piston
through the action of a polarized solenoid. The position of the actuator output
shaft is proportional to the input current of the solenoid coil controlling the
hydraulic pilot-valve plunger.
The EG-6/10 Proportional Actuator is available with either a drive shaft or an oil
motor. The drive shaft is driven by the prime mover to provide relative rotation
between the pilot-valve plunger and bushing, and also to rotate the oil pump
gears. The direction of rotation (clockwise or counterclockwise) is determined by
the placement of plugs in oil passages in the actuator to maintain the operating
oil pressure at about 1724 kPa (250 psi) above supply pressure in the EG-6 and
about 2758 kPa (400 psi) above supply pressure in the EG-10.
The EG-10P actuators that do not have an oil pump are equipped with an oil
motor. Oil under pressure must be supplied to the actuator: to provide working
pressure for the actuator and to rotate the pilot-valve bushing. Work output of the
EG-10P actuator equipped with an oil motor depends upon the pressure of the oil
supplied to the actuator.
Table 1-1. Governor Oil Pressure vs Maximum Work Output
Governor Operating Maximum Work
Oil Pressure Capacity
2758 kPa (400 psi) 12.6 J (9.30 ft-lb)
2068 kPa (300 psi) 9.5 J (7.00 ft-lb)
1724 kPa (250 psi) 8.1 J (6.00 ft-lb)
1379 kPa (200 psi) 6.3 J (4.65 ft-lb)
690 kPa (100 psi) 3.1 J (2.30 ft-lb)
The EG-10P can be equipped with either a Pickering or Kearfott Rotary Variable
Differential Transformer (RVDT) for operation of a gas valve, mechanical load
sharing, pitch control, or any application where valve or fuel-rack position is a
function of the control. A minimum-position switch is available for applications
which require this protection.
Governor System
The governor system includes:
A Woodward electronic governor
A magnetic pickup
A speed-setting potentiometer (optional)
A proportional electrohydraulic EG actuator described in this manual
Output pulses (proportional to prime mover speed) from the magnetic pickup are
processed by the speed sensor section of the electric governor and are applied as
a dc voltage (proportional to prime mover speed) to the summing point of the
control amplifier section of the electric governor. This speed voltage is compared to
a dc reference voltage from the speed-setting potentiometer, which corresponds to
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the prime mover speed desired. The governor output voltage increases, causing
the actuator output shaft to rotate in the increase-fuel direction.
References
Manual 25071 Oils for Hydraulic Controls
Manual 56105 EG-10P, EG-10PC Repair Procedure
Manual 82510 Magnetic Pickups and Proximity Switches for Electronic
Controls
Specifications
Radiation Resistance Radiation-resistant parts are available for special
applications.
Position Feedback A position feedback transducer (RVDT) is available
to monitor output shaft position.
Unless otherwise specified, these actuators are tested and shipped
for vertical operation. When used in a horizontal application, these
actuators will have an 8-degree shift in terminal shaft calibration.
Oil Motor Model
An oil motor actuator requires a supply of 552 to 3448 kPa (80 to 500 psi)
pressure oil from an external source to rotate the pilot valve bushing and to
provide the required work. Work output and stalled torque of the oil motor model
are in direct proportion to the supply pressure.
Compensation
Many EG actuators operate with oil supplied directly from the prime mover.
Certain multi-viscosity motor oils require a compensation system within the
actuator to provide needed stability. A needle valve is included in the
compensation system to allow response adjustment.
EG-10P oil-motor models with Class 1, Groups C and D approval are
limited to a maximum of 3448 kPa (500 psi) inlet pressure.
All Models
Output Shaft 0.375”-36 serrations (standard/EG-3P) both sides of
the case; 0.500”-36 serrations (standard/
EG-6P/10P) either side of the case. Special output
shafts are available.
Angular Travel 42° nominal travel available with 28° travel from no
load to full load at rated speed recommended
Calibration 2° to 3° off minimum shaft position at 20 mA. 36° ±3°
additional travel at 160 mA. Special calibrations are
available with a minimum of 80 mA required for full
stroke.
Hysteresis Within 3% of maximum stroke
Linearity Within 0.5%
Temperature Drift Nominally ±1° of output per 56 °C/100 °F
Transducer Coil
Resistance 30 to 35 Ω (at 20 °C/68 °F)
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Nominal Coil Input
Current Range 20 to 160 mA for single or two actuators operating
from one electric control
Electrical Connector 4-pin MS-33682-14S-2P. UL design does not have
connector
Hydraulic Oil Supply Fluid Hydrocarbon oil. Consult Woodward for
recommended synthetic oils. If multi-viscosity oils
are used, the compensated model is suggested.
Hydraulic Oil Viscosity 100 to 200 SUS at operating temperature
recommended. 50 SUS minimum, 3000 SUS
maximum (7.5 cSt to 650 cSt)
Oil Temperatures of
Continuous Operation 60 to 93 °C (140 to 200 °F) depending on oil
viscosity
Ambient Temperature
Range –29 to +93 °C (–20 to +200 °F). The primary
temperature concern is for the hydraulic fluid
properties in the actuator.
Case and Base
Construction Cast or ductile iron
Cover, Subcap, and
Drain Adapter Cast aluminum
Mounting Configuration Vertical (or horizontal with proper adjustments; non-
interchangeable).
Mounting Studs Four 5/16” diameter (approx. 7.9 mm)
Oil Pump Models (EG-10P)
Work Output Maximum 12.6 J (9.3 ft-lb). Travel is 2/3 full travel for
a work output of 8.4 J (6.2 ft-lb). Stalled torque rating
is 17.4 Nm (12.8 lb-ft)
Time Constant 0.17 second
Hydraulic Source Engine lubricating system or a separate sump
Supply Pressure 300 mm (1 ft) of lift to a maximum of 345 kPa (50
psi)
Flow Peak demand of 7.6 L/min (2 US gal/min) during
transients; steady-state flow of 1.9 L/min (0.5 US
gal/min) with 250 SUS oil supply
Filter 20 to 25 µm (nominal)
Pump Capacity 1519 cm³ (92.7 in³)/minute/1000 rpm
Pump Power Required 134 W (0.18 hp) at 1000 rpm required; 373 W (0.5
hp) at 1000 rpm recommended for motor drive
Supply Inlet 0.250”-18 NPTF (2). Use one or supply through
mounting surface.
Drain 11/32” dia. base, must have free discharge. For
horizontal mounting, use 0.250-18 NPTF in cover.
Mass/Weight 7.3 kg (16.0 lb)
Drive Rotation Plugged for either clockwise or counterclockwise
Recommended Drive
Speed 1500 to 4000 rpm
Drive Coupling 0.562-6 spline extends 0.562” (14.3 mm) from
mounting surface (standard)
Enclosure Rating IP54 per IEC60529:2001
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Oil Motor (EG-10P)
Work Output:
Recommended Output Shaft
Actuator Operating Maximum Work Travel is 2/3 full travel
Oil Pressure Output for a work output of:
400 psi 2758 kPa 9.3 Nm 12.6 ft-lb 6.2 Nm 8.4 ft-lb
300 2068 7.0 9.5 4.7 6.4
200 1379 4.6 6.2 3.1 4.2
100 690 2.3 3.1 1.5 2.0
Time Constant 1.06P–1/2 + 0.0059P1/2 s
where P=supply pressure in psig (1 psig=6.895 kPa)
Supply Pressures 552 to 3448 kPa (80 to 500 psi). Pressures outside
this range are not recommended.
Supply Flow Peak demand of 15 L/min (4 US gal/min) during
transients. Steady-state flow 5.3 L/min (1.4 US
gal/min) maximum, depending on orifice size and
operating pressure.
Filter 10 to 15 µm (nominal)
Pressure Inlet 0.250”-18 NPTF to pilot valve
Orifice (to oil motor supply):
Supply Pressure Orifice Diameter
80 to <100 552 to <690 0.076 1.93
100 to 175 690 to 1207 0.062 1.57
>175 to 300 >1207 to 2068 0.055 1.40
>300 to 500 >2068 to 3448 0.047 1.19
Drain 0.75”-14 NPTF on drain adapter. Must have free
discharge. For horizontal mounting, use 0.250”-18
NPTF in cover.
Mass/Weight 8 kg (17 lb)
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Chapter 2.
Installation
This chapter provides information for the receiving, storage, and installation of
the EG-10P actuator. See Figures 2-2, and 2-3 for typical outline drawings.
Storage
For short-term storage, fill the actuator with a good rust and oxidation inhibited oil.
Installation
External fire protection is not provided in the scope of this product. It
is the responsibility of the user to satisfy any applicable
requirements for their system.
Due to typical noise levels in turbine environments, hearing
protection should be worn when working on or around the EG-10P.
The surface of this product can become hot enough or cold enough
to be a hazard. Use protective gear for product handling in these
circumstances. Temperature ratings are included in the specification
section of this manual.
To avoid personal injury from improper lifting or from dropping the
actuator, be sure to use appropriate equipment and safe lifting
techniques when handling the actuator. Dry weight of the actuator is
approximately 8 kg (17 lb).
Attitude
For installation dimensions, see the outline drawing (Figures 2-2 and 2-3). The
actuator must fit evenly on the mounting pad. The four mounting bolts must be
evenly torqued, and there must be no movement or rocking of the actuator on its
mounting surface.
The actuator can be installed in a vertical or horizontal position. In any attitude
except vertical, the servo piston side of the actuator must be down to prevent air
pockets in the hydraulic system.
Drive Connection
The drive shaft of the oil pump actuator must fit into the drive coupling with a
free-slip fit. Do not apply external force. Be sure the drive does not bind or have
too much side load or end play. Two types of couplings are available:
9/16-6 spline internal-to-external
9/16-6 spline internal-to-internal
The coupling is first installed on the engine drive, then the actuator is added to
the internal spline on the coupling.
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Control Linkage
The output shaft will rotate 42 degrees. Use 2/3 (28 degrees) travel between no
load and full load. The additional “overtravel” should be split and used at both
ends to provide overfuel for transients and to assure shutdown at minimum
actuator position. The linkage must be free of binding, without backlash. If there
is a collapsible member in the linkage, it must not yield when the actuator moves
the linkage rapidly. The linkage may be spring-loaded to remove looseness.
Most applications require a linear linkage arrangement with each movement of
the output shaft of the actuator creating a similar movement of the fuel rack or
steam valve. If the actuator is providing control of a butterfly throttle valve, a non-
linear linkage is necessary (see Application Note 50516, Governor Linkage for
Butterfly Throttle Valves). The net result of any linkage arrangement should give
a linear relationship between actuator movement and developed torque of the
prime mover.
Electrical Connection
Due to the hazardous location listings associated with this product,
proper wire type and wiring practices are critical to operation.
Do not connect any cable grounds to “instrument ground”, “control
ground”, or any non-earth ground system. Make all required
electrical connections based on the wiring diagrams.
Each EG-10P actuator used in a Zone 2 environment must be provided with a
900 mA maximum fuse to be installed before the actuator.
Connect wiring to the actuator according to the plant wiring instructions included
with the control and with the actuator. Most installations call for jumpering
contacts C and D in the mating plug. RVDT or minimum-position switch features
will require different electrical connections. Actuators designed for use in
hazardous environments have conduit boxes permanently attached.
EG-6P, EG-10P Actuator (with Compensation)
Description
Many EG actuators operate with oil supplied directly from the prime mover.
Certain multi-viscosity motor oils require a compensation system within the
actuator to provide needed stability.
Needle Valve Adjustment
The needle valve is factory set at two turns out from closed. If instability is
experienced during operation with cold multi-viscosity oils, the unit should not be
run at a needle valve opening of less than one turn out from closed, as response
would not be acceptable. A wider needle valve opening provides quicker actuator
response but less stability. This adjustment must be made at start-up, before
engine oil warms up.
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Oil Supply
Clean Supply
Dirt in the oil can cause the actuator to malfunction.
Many oil pump model actuators are installed with a direct line from either the
engine pressure oil system or from the engine oil sump. A 20 to 25 µm absolute
filter should be installed in the line from the engine. Many units operate
satisfactorily without this filter, depending upon the engine filter to protect against
contamination. In case of control problems with an unfiltered oil supply, clean the
actuator and install the prescribed filter in the oil supply line.
Install a 10 to 15 µm nominal filter in the supply line to the oil motor model.
No regular maintenance is required if oil filtration requirements are followed.
Oil Pump Actuator Connection
Connect a 0.375 OD (approx. 9.5+ mm) oil line from the supply to the 0.250
(approx. 6.4–mm) pipe-tapped inlet hole in the actuator. This oil line should
include a 20 to 25 µm absolute filter. Oil supply to the actuator should not exceed
305 mm (12 inches) of lift to a maximum of 345 kPa (50 psig) boost pressure at
the actuator end of the supply line.
Flow rates of a maximum demand of 7.6 L/min (2.0 US gal/min) during transients
with a steady-state of 0.9 L/min (0.25 US gal/min) at 2758 kPa (400 psi) and 60
SUS are required.
Some engines have the oil supply built into the mounting pad. In these cases the
0.250 pipe-tapped connection is plugged. No filter can be installed in these units,
and the actuator depends upon the engine filter for protection.
Most oil-pump actuators drain through the mounting base to sump. If a special
drain is used, the drain line must be adequate to prevent any back pressure on
the actuator.
Back pressure from the drain may cause jiggle or instability in the
actuator.
Oil Motor Actuator Connection
Connect a 0.375 OD (approx. 9.5+ mm) oil line from the supply to the 0.250
(approx. 6.4–mm) tapped inlet hole supplying the actuator pilot valve. This line
must include a 10 to 15 µm absolute filter.
The oil motor requires an orifice to restrict oil supply flow. Normally the orifice is
internal in the actuator and comes with the actuator. When specified by the
customer, the oil motor supply may be a separate external line with an
appropriate orifice installed in the connection with the oil motor. The orifice size
must be matched to the oil pressure supplied to the actuator (see Table 2-1). The
10 to 15 µm absolute filter must service this supply line as well as the pilot-valve
supply line.
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Adequate drain is important for dependable and stable operation of the oil motor
actuator. A minimum of 25 mm (1 inch) ID drain is needed with a continuous drop
for up to 3 m (10 ft) from the actuator. Drains longer than 3 m (10 ft) will probably
require larger ID pipe. No oil traps can occur in this drain line. It is important that
oil not back up to and into the actuator.
Back pressure from the oil drain may cause actuator jiggle as
hydraulic resonance can occur.
Table 2-1. Orifice Size for Oil Motor Supply Pressure
552 to 621 kPa (80 to 90 psi) 1.93 mm (0.076 inch) diameter
690 to 1207 kPa (100 to 175 psi) 1.57 mm (0.062 inch) diameter
1214 to 2068 kPa (176 to 300 psi) 1.40 mm (0.055 inch) diameter
2075 to 3448 kPa (301 to 500 psi) 1.19 mm (0.047 inch) diameter
Figure 2-1. Oil Viscosity Chart
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Figure 2-2. Outline Drawing of Typical EG-P Actuator (Oil Pump Model)
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Figure 2-3. Outline Drawing of Typical EG-P Actuator (Oil Motor Model)
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Figure 2-4. Outlines of Typical Applications
(Pickering RVDT options, minimum-position switch options, and UL wiring
options for installation in hazardous locations)
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Figure 2-5. Oil Pump Rotation Plugs
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