King Instrument 7910 Series Installation Instructions Manual
7910 Series
Installation Instructions
FLOW METER LIMITED WARRANTY
Meters are warranted against defects in materials and workmanship to the original user for a period of
thirteen (13) months from the date of factory shipment, provided the meter is installed, operated and
maintained in accordance with King Instrument Company’s instructions and recommendations.
This warranty does not apply if failure is caused or contributed to by any of the following: improper
handling, improper storage, abuse, unsuitable application of the product, lack of reasonable and
necessary maintenance, use exceeding suggested pressure and temperature maximums, improper
packaging for return, or repairs made or attempted to be made by anyone other than King Instrument
Company, Inc.
KING INSTRUMENT COMPANY, INC. MAKES NO WARRANTY AS TO THE FITNESS OF ITS PRODUCTS FOR
SPECIFIC APPLICATIONS.
This warranty is valid for the original end-user only and does not apply to products that have been
damaged or modied. This warranty is non-transferrable and is limited to replacement or repair. The
liability of King Instrument Company arising out of its supply of the products, or their use, shall not in
any case exceed the cost of correcting defects in the products as set forth above.
THIS WARRANTY IS A LIMITED WARRANTY AND SHALL BE IN LIEU OF ANY OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THERE ARE NO OTHER WARRANTIES WHICH EXIST
BEYOND THE DESCRIPTION OR FACE HEREOF.
IN NO EVENT SHALL KING INSTRUMENT COMPANY BE LIABLE FOR LOSS OF PROFITS, INDIRECT, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Products should be returned, prepaid, to King Instrument Company, Inc. with proof of purchase. Call
factory for Return Merchandise Authorization (RMA) number and return instructions.
THIS IS IMPORTANT INFORMATION.
READ IT CAREFULLY BEFORE BEGINNING WORK.
1) Inspect meter for damage that may have occurred during shipping.
Report any damage to the container to the freight carrier immediately.
2) Make sure your pressure, temperature, uid and other requirements
are compatible with the meter and components (including o-rings).
3) Select a suitable location for installation to prevent excess stress on
the meter which may result from:
a) Misaligned pipe.
b) The weight of related plumbing.
c) “Water Hammer” which is most likely to occur when ow is
suddenly stopped as with quick closing solenoid operated
valves. (If necessary, a surge chamber should be installed. This
will also be useful in pressure start-up situations.)
d) Thermal expansion of liquid in a stagnated or valve isolated
system.
e) Instantaneous pressurization which will stress the meter and
could result in tube failure.
NOTE: In closed thermal transfer or cooling systems, install the meter
in the cool side of the line to minimize meter expansion and contraction and possible uid leaks at the threaded connections.
4) Handle the meter carefully during installation.
a) Use an appropriate amount of teon tape on external pipe
threads before making connections. Do not use paste or stick
type thread sealing products.
5) Install the meter vertically with the inlet port at the bottom.
6) Connections: Fittings are fully rotatable by loosening the tting
retainer screws during installation. Make sure tting retainer screws
are tightening after adjustment of tting.
7) Meters with stainless steel ttings will support several feet of pipe
as long as signicant vibration or stress resulting from misaligned pipe
are not factors.
8) Meters with plastic ttings must be installed so that ttings are not
made to support any part of the associated plumbing. In addition,
meter frame should be fastened to bulkhead, panel or column.
9) Meters used in gas service should have suitable valves plumbed in
at the inlet and outlet of the meter. These valves should be no more
than 1-1/2 pipe diameters from the meter ports. The valve at the outlet should be used to create back pressure as required to prevent oat
bounce. It should be set initially and then left alone. The inlet valve
should be used for throttling purposes. Depending on the installation,
valves may not be essential, but they are most useful in many installations. Remember: To get a correct reading of ow in gas service, it is
necessary to know the pressure right at the outlet of the meter (before
the valve).
(714) 891-0008 • www.kinginstrumentco.comWhen it comes to ow...we’re instrumental.
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7910 Series
Maximum Non-Shock Pressure and Temperature
Fitting Temperature Pressure
PVC 115°F
316LSS 200°F
Ambient Temp. 33° F -125° F
CAUTION
• O-rings should be replaced if meter is disassembled after it has
been in service
• Serious property damage and great personal injury could occur as
the result of a meter misused or used in an unsuitable application.
CLEANING
Carefully remove the owmeter from piping system. Remove the
shield cover screws from the back cover. Remove the back shield
cover and shield. Remove the end tting retainer screws from the
top end tting. Remove the top end tting and end tting retainer.
Carefully remove the glass meter tube from the top of the case. Pulling glass tube at an extreme angle, or by excessive force will cause
tube to break. Do not allow oat to fall out. Float damage may result
in inaccuracy. All necessary instrument components are now fully
accessible for cleaning with a bottle brush and appropriate mild
soap solution*. Before the meter is reassembled, inspect all parts for
damage. O-rings should be replaced during meter maintenance and
cleaning.
*Do not use cleaning agents that will damage oat, tube or o-rings.
To reassemble, carefully install the meter back into the case from the
top. Reinstall the top end tting and end tting retainer and tighten
end tting retainer screws. Reinstall back shield and back shield
cover and tighten the shield cover screws. Reinstall owmeter into
piping system.
Meters should be cleaned with a mild soap solution. This will be an
eective cleaner of rust stains. Caution must be used so that materials of construction are not damaged by cleaning solutions. Hard wa-
ter deposIts can be removed with 5% acetic acid solution (vinegar).
150 psig (31W-89W)
125 psig (94W-99W)
300 psig (31W-46W)
250 psig (51W-613W)
150 psig (84W-89W)
125 psig (94W-99W)
Installation Instructions
REPAIR
7910 meters that require repair should be sent to the factory. Please
call for a Return Merchandise Authorization (RMA) number and
return instructions.
WARNING:
Pressure and temperature ratings are based on a study of the engineering data for particular materials used in construction and on the
design of individual models. This information is supplemented by destructive test results. Meters with stainless enclosures must never be
operated without shields securely in place. Meters exposed to dicult environments such as those created by certain chemicals, excessive vibration or other stress inducing factors could fail at or below
the suggested maximums. Never operate meters above pressure and
temperature maximums. It is strongly recommended that all meter
installations utilize an appropriate pressure relief valve and/or rupture disc. The pressure settings and locations of these devices should
be such that meters cannot be over pressurized. Meter failure could
result in damage to equipment and serious personal injury. Always
use suitable safety gear, including OSHA approved eye protection
when working around meters in service. We are happy to pass along
chemical compatibility information that has been published by the
manufacturer’s of raw materials used in our products; however, this
information should not be construed as a recommendation made by
King Instrument Company, Inc. for a specic application.
(714) 891-0008 • www.kinginstrumentco.comWhen it comes to ow...we’re instrumental.
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