YARWAY
9100 SERIES ARC
®
VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Emerson.com/FinalControl
Before installation, these instructions must be read carefully and understood.
© 2017 Emerson. All Rights Reserved.
VCIOM-07087-EN 19/06
GENERAL
The 9100 Series ARC
®
Valve is an automatic,
modulating, recirculation control valve for
protection of centrifugal pumps and high speed
pumps against overheating and possible
unstable operation during low-load periods.
With only three moving parts (disc, seal and
spring), the valve functions simultaneously as:
(1) check valve – to prevent flow through
the pump and function as a flow sensor and
(2) bypass control valve – to maintain the
minimum pump flow and provide pressure
letdown.
FEATURES
1. Five separate functions in a single valve
body without external power source:
(a) reverse flow prevention, (b) low flow
detection, (c) modulating bypass flow
control, (d) bypass flow pressure reduction,
and (e) back pressure regulation of bypass
flow (as required).
2. Compact, self-contained design that
eliminates divided installation responsibility
occurring with systems involving
combinations of pneumatic, thermal and
mechanical devices.
3. Minimum wear on vital parts during
pressure reduction of bypass flow.
4. Quiet pressure drop provided by a bypass
that dissipates the energy effectively.
For high pressure drop capability and/
or increased cavitation resistance a back
pressure regulator is available. External
bypass regulators are available for
mounting in down stream piping.
5. Corrosion resistant surfacing of disc seat.
6. Steel or stainless steel body available.
Elastomer seals allow usage to 475°F
[246°C]. Service exceeding these
temperatures use the extreme temperature
valve design. Refer to separate manual
supplement for information.
7. Available with materials covered by NACE.
Standard MR0175 (sulfide stress cracking
resistant metallic material for oil field
equipment).
8. All connections flanged.
9. Field Replaceable flow element (seat
insert) for ease of maintenance and ability
to modify flow characteristics as system
requirements change.
Engineering Doc. #965849 Rev. H
