Emerson VAREC Series, VAREC 180, VAREC 181 Installation, Operation And Maintenance Instructions
VAREC SERIES 180/181 DOUBLE PORT REGULATOR
InstallatIon, operatIon and maIntenance InstructIons
Before installation these instructions must be read fully and understood
DISCLAIMER OF WARRANTIES
The contract between the seller and the buyer
states the entire obligation of the seller. The
contents of this instruction manual shall not
become part of or modify any prior or existing
agreement, commitment or relationship
between the seller and buyer. There are no
express or implied warranties set out in this
instruction manual. The only warranties that
apply are those in the existing contract between
the seller and buyer.
The Varec 180/181 Series double port
regulators have not been tested under all
possible operational conditions and Emerson
does not have all the data relative to your
application. The information in this instruction
manual is not all inclusive and does not and
cannot take into account all unique situations.
Consequently, you should review this product
literature in view of your application. If you have
any further questions, please contact Emerson
for assistance.
LIMITATIONS OF SELLER'S LIABILITY
In the event that a court holds that this
instruction manual created some new
warranties, the seller's liability shall be limited
to repair or replacement under the standard
warranty clause. In no case shall the seller's
liability exceed that stated as Limitations of
Remedy in the contract between the seller and
buyer.
SAFETY PRECAUTIONS
Read and understand this instruction manual
before installing, operating or performing
maintenance on Varec 180/181 series double port
regulator. Follow all precautions and warnings
noted herein when installing, operating or
performing maintenance on this equipment.
Safety precaution definitions:
CAUTION
Damage to equipment may result if this
precaution is disregarded.
WARNING
Direct injury to personnel or damage to
equipment which can cause injury to personnel
may result if this precaution is not followed.
GENERAL
Varec Series 180/181 regulators are diaphragm
operated and weighted lever controlled, highly
sensitive gas control valves. The regulators
are designed for maintaining a constant
downstream pressure automatically. They are
used widely in vapor recovery systems and gas
blanketing systems to maintain a slight positive
pressure on the tanks.
Use of parts that are not manufactured or
supplied by Emerson voids any Emerson
warranty and relieves Emerson of any
obligation to service the product under
warranty. Emerson recommends the use of
only Emerson manufactured or supplied parts
to maintain or service Varec Series 180/181
double port regulators.
This document, or any part of, may not be
reproduced by any means without written
permission of Emerson.
33-11023 Rev.D
valves.emerson.com VCIOM-03189-EN 17/05
© 2017 Emerson. All Rights Reserved.
VAREC SERIES 180/181 DOUBLE PORT REGULATOR
InstallatIon, operatIon and maIntenance InstructIons
CONSTRUCTION
1. Standard materials of construction include
a cast aluminum body and galvanized steel
diaphragm housing, reinforced NBR rubber
diaphragm and 304 stainless steel plugs,
seats and other trim. Special materials such
as cast iron or cast steel valve bodies or
PTFE diaphragms are also available.
2. Connections are NPT threaded on sizes
½" through 1½". Connections are flanged,
drilled to 125 PSI ANSI requirements on
sizes 2" through 8". Aluminum or iron valve
bodies are provided with flat face flanges,
while steel bodies are provided with raised
face flanges.
INSTALLATION
Series 180/181 regulators must be installed in
an upright position in a horizontal pipeline, as
shown on the reference drawing. Flow through
the valve must be in the direction indicated by
the arrow on the valve body. The valve should
be located free of contact with any adjacent
equipment or pipelines. Connection piping
should be fitted accurately to be gas tight
without strain on the valve body or diaphragm
housing.
Unboxing and handling
Particular care should be exercised in unboxing
and handling regulators. Bending of control
mechanism, strain to diaphragm or changing
position of balance weights will result in
unsatisfactory operation.
When handling, grasp and support only by
the valve body. Do not handle by grasping the
diaphragm housing, linkage mechanism or
weight arm.
After unboxing, inspect to insure against
presence of dirt or other foreign matter. Also,
check valve seats and plugs for cleanliness and
freedom of operation.
Adjustment
Varec Series 180/181 regulators are shipped
from the factory fully assembled and preset
to operate at the customers specified setting.
Further adjustment should not be necessary.
However, if it should become necessary to
change from the factory setting, the procedure
detailed on page 3 should be followed.
It is recommended that stop valves be installed
in upstream and downstream piping and in the
control line to the regulator to permit taking
the regulator off the line for maintenance
purposes. Regulators having screwed
connections should have all pipe lines fitted
with ground joint unions located between the
stop valves and the regulator.
Control line piping should be 2” size and
should be connected to downstream piping
as far downstream as possible, preferably to
the location at which the pressure control is
desired. Minimum should never be less than
10feet from the regulator. Control piping
should be fitted accurately to be gas tight
without strain on the diaphragm housing and
should be supported firmly.
All upstream, downstream and control pipe
lines should be cleaned thoroughly prior to
installing the regulator.
2
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