Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
1
Safety Information
Important - Please Read Before
Installation
Masoneilan 171/172 Series instructions contain
DANGER
,
WARNING
, and
CAUTION
labels, where necessary, to alert
you to safety related or other important information. Read
the instructions carefully
before
installing and maintaining
your control valve.
DANGER
and
WARNING
hazards
are related to personal injury.
CAUTION
hazards involve
equipment or property damage. Operation of damaged
equipment can, under certain operational conditions, result in
degraded process system performance that can lead to injury
or death. Total compliance with all
DANGER
,
WARNING
,
and
CAUTION
notices is required for safe operation.
This is the safety alert symbol. It alerts you to potential
personal injury hazards. Obey all safety messages that
follow this symbol to avoid possible injury or death.
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury.
When used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, could
result in property damage.
Note:
Indicates important facts and conditions.
About this Manual
• The information in this manual is subject to change without
prior notice.
• The information contained in this manual, in whole or part,
shall not be transcribed or copied without Masoneilan’s
written permission.
• Please report any errors or questions about the information
in this manual to your local supplier.
• These instructions are written specifically for the 171 & 172
Series pressure reducing regulators, and do not apply to
other regulators outside of this product line.
Warranty
Items sold by Dresser
®
are warranted to be free from defects
in materials and workmanship for a period of one year from
the date of shipment provided said items are used according
to Dresser recommended usages. Dresser, Inc. reserves the
right to discontinue manufacture of any product or change
product materials, design or specifications without notice.
This instruction manual applies to the Masoneilan 171 & 172
Series pressure reducing regulators.
The Regulator MUST BE:
• Installed, put into service and maintained by qualified
and competent professionals who have undergone
suitable training.
• Under certain operating conditions, the use of damaged
equipment could cause a degradation of the performance
of the system which may lead to personal injury or
death.
• Changes to specifications, structure, and components
used may not lead to the revision of this manual unless
such changes affect the function and performance of the
product.
• All surrounding pipe lines must be thoroughly flushed to
ensure all entrained debris has been removed from the
system.
DV-215-171_172 series Inst-v13.indd 1
11/5/08 12:13:37 PM