Emerson Yarway 7100 Series Installation And Maintenance Instructions Manual

YarwaY 7100 SerieS ArC
InstallatIon and maIntenance InstructIons
Before installation these instructions must be fully read and understood
GENEral
Yarway 7100 Series ArC Automatic
®
recirculation Control valve for all valves
Serial no. A71230 and below.
INstallatION
General instructions
1. look at typical installation diagram
(see figure 1).
2. Valve can be installed in any position.
However, flow arrow on body must match
flow direction in pipe.
3. Valve body material is either carbon steel
(ASMe-SA 216 WCB) or stainless steel
(ASMe SA351 Cf8M).
look at the valve nameplate - it will
identify the material for your valve!
4. When welding valve in line, select
compatible weld rod and follow all
applicable codes and regulations.
5. follow recommendations on installation
diagram (opposite page) for straight pipe,
maintenance clearances and auxiliary valve
locations. refer to 'iSA handbook of control
valves' Chapter 12 for other recommended
installation practices.
CautION!
The valve you are about to install contains
elastomer seals. If welding the valve in line,
do one of two things;
valves.emerson.com
VAlVe non-filtered deSign
®
either:
1. Keep the main body of valve below 300°F
during preheat, welding and post weld heat
treatment.
OR
2. Disassemble the valve to remove seal
containing parts (refer to Maintenance section
for procedures - disc/bonnet removal and
bypass bushing cartridge removal).
Note: failure to follow these precautions will
result in damaged seals!
OpEratION
CautION!
There are only two adjustments described in the
following notes, which can be made to an installed
and operating valve. Your valve has been preset
and tested at the factory for your conditions.
Adjustments are necessary only when conditions
change and are not to be made before contacting
a Yarway application engineer to determine how
much adjustment, if any, is necessary. Making
adjustments on your own can cause serious
damage to the pump and system.
1. the 7100 Series valve is a self-contained,
fully automatic device which requires no
external power or signals to perform its
function.
2. the valve does two things: (1) it protects the
pump from reverse flow, and (2) prevents
the pump from overheating during low
load periods.
3. Your valve has a modulating bypass. the
bypass will open or close gradually so
that the sum of main flow and bypass flow
will never be below the minimum flow
requirement of the pump.
4. if operating conditions should change,
two adjustments can be made in the
valve (within limits). they are:
a. Switchpoint.
b. Bypass capacity.
Switchpoint is the main flow quantity at
which the bypass will open or close.
Bypass capacity is the flow quantity that
will pass through the bypass.
© 2017 emerson. All rights reserved.
engineering doc. #968155 rev. d
VCIOM-03339-EN 17/05