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Series 252 Servovalves
Product Information
011-182-906 N
Copyright information © 1981-2013 MTS Systems Corporation. All rights reserved.
Trademark information MTS is a registered trademark of MTS Systems Corporation within the United
States. This trademark may be protected in other countries.
DTE is a registered trademark of Exxon Mobil Corporation. Tellus is a registered
trademark of Shell Oil Corporation. All other trademarks or service marks are
property of their respective owners.
Publication information
Manual Part Number Publication Date
111829-01A March 1981
111829-02A June 1981
111829-03A July 1981
111829-04A June 1982
111829-05A February 1982
111829-06A February 1983
111829-06B January 1988
111829-06F January 1993
111829-06G November 1998
011-182-903 H November 1999
011-182-903 J September 2003
011-182-903 K April 2007
011-182-903 L March 2008
011-182-903 M October 2009
011-182-903 N March 2013
2
Series 252 Servovalve Product Information
Contents
Technical Support 5
How to Get Technical Support 5
Before You Contact MTS 5
If You Contact MTS by Phone 6
Problem Submittal Form in MTS Manuals 7
Preface 9
Before You Begin 9
Conventions 10
Documentation Conventions 10
Introduction 13
About the Servovalve 14
Servovalve Function 14
Servovalve Applications 16
Single Servovalves 17
Dual Servovalves 18
Three-Stage Servovalves 19
252 Servovalve General Specifications 20
252 Servovalve Flow Ratings 21
252 Servovalve Performance Characteristics 22
252 Servovalve Dimensions 23
Installation 25
252 Servovalve Installation 25
252 Servovalve Cable Connections 28
Five-Port Operation—252.2x Servovalve 29
Five-Port Operation—252.3x Servovalve 30
Series 252 Servovalve Product Information Contents
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Maintenance 33
Replace the Servovalve Filter Element 33
Adjust the Mechanical Null 35
Troubleshooting Guide 39
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Contents
Series 252 Servovalve Product Information
Technical Support
How to Get Technical Support
How to Get Technical Support
Start with your
manuals
Technical support
methods
The manuals supplied by MTS provide most of the information you need to use
and maintain your equipment. If your equipment includes software, look for
online help and README files that contain additional product information.
If you cannot find answers to your technical questions from these sources, you
can use the Internet, e-mail, telephone, or fax to contact MTS for assistance.
MTS provides a full range of support services after your system is installed. If
you have any questions about a system or product, contact Technical Support in
one of the following ways.
www.mts.com The web site provides access to our technical support staff by means of an
onlineform:
www.mts.com > Contact MTS > Service & Technical Support button
E-mail tech.support@mts.com
Telephone MTS Call Center 800-328-2255
Weekdays 7:00 A.M. to 5:00 P.M., Central Time
Fax 952-937-4515
Please include “Technical Support” in the subject line.
Outside the U.S. For technical support outside the United States, contact your local sales and
service office. For a list of worldwide sales and service locations and contact
information, use the Global MTS link at the MTS web site:
www.mts.com > Global MTS > (choose your region in the right-hand
column) > (choose the location closest to you)
Before You Contact MTS
MTS can help you more efficiently if you have the following information
available when you contact us for support.
Know your site
number and system
number
Series 252 Servovalve Product Information Technical Support
The site number contains your company number and identifies your equipment
type (such as material testing or simulation). The number is typically written on a
label on your equipment before the system leaves MTS. If you do not know your
MTS site number, contact your sales engineer.
Example site number: 571167
When you have more than one MTS system, the system job number identifies
your system. You can find your job number in your order paperwork.
Example system number: US1.42460
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If You Contact MTS by Phone
Know information from
prior technical
If you have contacted MTS about this problem before, we can recall your file
based on the:
assistance
• MTS notification number
• Name of the person who helped you
Identify the problem Describe the problem and know the answers to the following questions:
• How long and how often has the problem occurred?
• Can you reproduce the problem?
• Were any hardware or software changes made to the system before the
problem started?
• What are the equipment model numbers?
• What is the controller model (if applicable)?
• What is the system configuration?
Know relevant
For a computer problem, have the following information available:
computer information
• Manufacturer’s name and model number
• Operating software type and service patch information
• Amount of system memory
• Amount of free space on the hard drive where the application resides
• Current status of hard-drive fragmentation
• Connection status to a corporate network
Know relevant
For software application problems, have the following information available:
software information
• The software application’s name, version number, build number, and (if
available) software patch number. This information can typically be found
in the About selection in the Help menu.
• The names of other applications on your computer, such as:
– Anti-virus software
– Screen savers
– Keyboard enhancers
– Print spoolers
– Messaging applications
If You Contact MTS by Phone
Technical Support
6
A Call Center agent registers your call before connecting you with a technical
support specialist. The agent asks you for your:
• Site number
Series 252 Servovalve Product Information
Problem Submittal Form in MTS Manuals
• Name
• Company name
• Company address
• Phone number where you can be reached
If your issue has a notification number, please provide that number. A new issue
will be assigned a unique notification number.
Identify system type To enable the Call Center agent to connect you with the most qualified technical
support specialist available, identify your system as one of the following types:
• Electromechanical material test system
• Hydromechanical material test system
• Vehicle test system
• Vehicle component test system
• Aero test system
Be prepared to
Prepare to perform troubleshooting while on the phone:
troubleshoot
• Call from a telephone close to the system so that you can implement
suggestions made over the phone.
• Have the original operating and application software media available.
• If you are not familiar with all aspects of the equipment operation, have an
experienced user nearby to assist you.
Write down relevant
In case Technical Support must call you:
information
• Verify the notification number.
• Record the name of the person who helped you.
• Write down any specific instructions.
After you call MTS logs and tracks all calls to ensure that you receive assistance for your
problem or request. If you have questions about the status of your problem or
have additional information to report, please contact Technical Support again and
provide your original notification number.
Problem Submittal Form in MTS Manuals
Use the Problem Submittal Form to communicate problems with your software,
hardware, manuals, or service that are not resolved to your satisfaction through
the technical support process. The form includes check boxes that allow you to
indicate the urgency of your problem and your expectation of an acceptable
response time. We guarantee a timely response—your feedback is important to
us.
Access the Problem Submittal Form:
Series 252 Servovalve Product Information Technical Support
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Problem Submittal Form in MTS Manuals
• In the back of many MTS manuals (postage paid form to be mailed to MTS)
• www.mts.com > Contact Us > Problem Submittal Form button (electronic
form to be e-mailed to MTS)
Technical Support
8
Series 252 Servovalve Product Information
Before You Begin
Preface
Before You Begin
Safety first! Before you use your MTS product or system, read and understand the Safety
manual and any other safety information provided with your system. Improper
installation, operation, or maintenance can result in hazardous conditions that can
cause severe personal injury or death, or damage to your equipment and
specimen. Again, read and understand the safety information provided with your
system before you continue. It is very important that you remain aware of
hazards that apply to your system.
Other MTS manuals In addition to this manual, you may receive additional manuals in paper or
electronic form.
You may also receive an MTS System Documentation CD. It contains an
electronic copy of the manuals that pertain to your test system, such as:
• Hydraulic and mechanical component manuals
• Assembly drawings
• Parts lists
• Operation manual
• Preventive maintenance manual
Controller and application software manuals are typically included on the
software CD distribution disc(s).
Series 252 Servovalve Product Information Preface
9
Conventions
DANGER
WARNING
CAUTION
Conventions
Documentation Conventions
The following paragraphs describe some of the conventions that are used in your
MTS manuals.
Hazard conventions Hazard notices may be embedded in this manual. These notices contain safety
information that is specific to the activity to be performed. Hazard notices
immediately precede the step or procedure that may lead to an associated hazard.
Read all hazard notices carefully and follow all directions and recommendations.
Three different levels of hazard notices may appear in your manuals. Following
are examples of all three levels.
Note For general safety information, see the safety information provided with
your system.
Danger notices indicate the presence of a hazard with a high level of risk which,
if ignored, will result in death, severe personal injury, or substantial property
damage.
Warning notices indicate the presence of a hazard with a medium level of risk
which, if ignored, can result in death, severe personal injury, or substantial
property damage.
Caution notices indicate the presence of a hazard with a low level of risk which,
if ignored, could cause moderate or minor personal injury or equipment damage,
or could endanger test integrity.
Notes Notes provide additional information about operating your system or highlight
easily overlooked items. For example:
Note Resources that are put back on the hardware lists show up at the end of
the list.
Special terms The first occurrence of special terms is shown in italics.
Illustrations Illustrations appear in this manual to clarify text. They are examples only and do
not necessarily represent your actual system configuration, test application, or
software.
Electronic manual
conventions
This manual is available as an electronic document in the Portable Document
File (PDF) format. It can be viewed on any computer that has Adobe Acrobat
Reader installed.
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Preface
Series 252 Servovalve Product Information
Documentation Conventions
Hypertext links The electronic document has many hypertext links displayed in a blue font. All
blue words in the body text, along with all contents entries and index page
numbers, are hypertext links. When you click a hypertext link, the application
jumps to the corresponding topic.
Series 252 Servovalve Product Information Preface
11
Documentation Conventions
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Preface
Series 252 Servovalve Product Information
Introduction
Series 252.3x Servovalve
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Revision C Revision G
Contents About the Servovalve 14
The MTS Series 252 Servovalves are designed for use with actuators requiring
3.8 to 227 L/min (1 to 60 gpm) of fluid flow.
Servovalve Function 14
Servovalve Applications 16
252 Servovalve General Specifications 20
252 Servovalve Flow Ratings 21
252 Servovalve Performance Characteristics 22
252 Servovalve Dimensions 23
Series 252.2x/4x Servovalve
Note The Series 252.2x/4x Servovalves are available in two versions. Both
versions are interchangeable and have similar specifications.
Important If you are replacing an existing servovalve and you encounter any
component interference or alignment issues, contact MTS
Technical support. Trying to reposition components without
knowing the ramifications can cause equipment damage.
What you need to
know
Series 252 Servovalve Product Information Introduction
MTS Systems Corporation assumes that you know how to use your controller.
See the appropriate manual for information about performing any controllerrelated step in this manual’s procedures. You are expected to know how to
perform the following procedures.
• Turn hydraulic pressure on and off.
• Select a control mode.
• Manually adjust the actuator position.
• You should have experience installing or servicing servohydraulic
equipment.
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