Emerson VAREC Series Manual

valves.emerson.com VCIOM-03189-EN 17/05

Before installation these instructions must be read fully and understood

VAREC SERIES 180/181 DOUBLE PORT REGULATOR

InstallatIon, operatIon and maIntenance InstructIons

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.

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.

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.

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.

33-11023 Rev.D

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.

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

10feet 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.

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.

VAREC SERIES 180/181 DOUBLE PORT REGULATOR

InstallatIon, operatIon and maIntenance InstructIons

NOTE

For identification of parts referenced, see figure below.

Connect suitable manometer or pressure gauge to

diaphragm control line.

Diaphragm housing

Spring housing

Drain

Control line connection

(2" NPT)

1. Minor adjustments

Shifting position of weights (items 1 and 2)

on weight arm (item 3) and position of weight

arm on pivot clamp (item 4) will satisfy minor

adjustments. The maximum minor adjustment

is attained when both weights are positioned at

the furthermost possible position on the weight

arm at the opposite side from the diaphragm

and with the arm at its furthermost position

on the pivot clamp at the opposite side from

the diaphragm. The arm must be kept free of

contact with the diaphragm housing to permit

full swing from closed to full open position

of the regulator. As the weights and arm are

shifted toward the diaphragm side of the pivot

clamp, the setting is lowered.

2. Major adjustments

In the event it is not possible to attain the

desired setting by the method described for

minor adjustments, it becomes necessary to

make further adjustments by means of a spring

provided for that purpose. Prior to adjusting the

spring, it is desirable to locate the weight arm

and weights in a position as shown in the figure

above to allow minor adjustment in either

direction later if necessary.

Having positioned the weights and arm,

remove cover (item 5) exposing adjustment

nut (item 6). If the desired setting is lower

than the factory setting, tighten up the spring

adjustment nut (clockwise) until the resulting

desired setting is attained. If the desired setting

is higher than the factory setting, back-off on

the spring adjustment nut. Having reached an

approximate desired setting by means of the

adjusting spring, make final close adjustment

with the weights. Replace cover.

VAREC SERIES 180/181 DOUBLE PORT REGULATOR

InstallatIon, operatIon and maIntenance InstructIons

OPERATION

Line pressure as sensed through control

line piping is applied to one side of the

diaphragm. This pressure acts against

balance weights to open and close (regulate)

the plugs within the double ported valve body.

2. As line pressure upstream of the regulator

begins to rise above or fall below the set

point of the regulator, the valve will 'throttle'

as required to maintain this set pressure.

MAINTENANCE

Regulators require very little attention.

Periodically the cover over the linkage should

be lifted and the parts inspected for ease of

operation by observing the action when the

weight arm is moved manually. Performance of

the regulator can be checked by observing the

system pressure when in operation.

REPLACEMENT PARTS

When ordering replacement parts, specify

regulator parts by model number and pipe size.

Identify replacement parts by description and

part number where possible.

Item description ½” size 1” size 1 ½” size 2” size 3” size 4” size 6” size 8” size

Upper and lower body gasket B2194-046 B2194-046 B2194-046 B2194-046 B2244-046 B2222-046 D900-046 B11545-046

Bonnet gasket B2195-046 B2195-046 B2195-046 B2195-046 B2195-046 B2195-046 B2195-046 B2195-046

Bonnet cover gasket D3928-046 D3928-046 D3928-046 D3928-046 D3928-046 D3928-046 D3928-046 D3928-046

O-ring P14-10 P14-10 P14-10 P14-10 P14-10 P14-10 P14-10 P14-10

Diaphragm

PTFE B1527-094 B1527-094 B1527-094 B1527-094 B1527-094 B1527-094 C809-194 C809-194

NBR B1527-074 B1527-074 B1527-074 B1527-074 B1527-074 B1527-074 C809-074 C809-074

FKM B1527-087 B1527-087 B1527-087 B1527-087 B1527-087 B1527-087 C809-087 C809-087

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