7450 series, Installation instructions – KING 7450 Series User Manual

Page 2

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When it comes to flow...we’re instrumental.

caution

• 7450 Series meters have o-ring seals. Use with incompatible fluid-

may cause o-rings to swell which may cause glass tube to fail.

• Extra caution must be exercised when meters are used in high

pressure gas cylinder applications. Pressure regulators should be
installed at the cylinder and at the inlet of the meter.

• 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 flowmeter from the piping system. Remove the
front and back shield. Remove the end fittings using a

” wrench. Us-

ing a

” hex key, back off the compression screw by turning counter

clockwise. This will release the compression of the glass tube. Carefully
remove the screws that hold the outlet block. Remove the outlet block
and internals. Remove glass tube.
Valve Models: Remove valve from the bottom block using a

” open

ended wrench. Disassembly of valve is not recommended. Outer valve
o-ring should be replaced during meter maintenance and cleaning.
All components are now fully accessible for cleaning. Components can
be cleaned with a mild soap solution. This will be an effective cleaner
of rust stains. A bottle brush may be helpful in cleaning the inside of
the glass tube. Caution must be used so that materials of construction
are not damaged by cleaning solutions. Hard water deposits can be
removed with a 5% acetic acid solution (vinegar). Before the meter is
reassembled, inspect all parts for damage. O-rings should be replaced
during meter maintenance and cleaning.
To reassemble, position the glass tube on the bottom block and
center onto bottom gasket. Insert float, if on a guide rod make sure
the bottom end of the guide rod is inserted into the center hole of the
bottom float stop. Re-install the outlet block. Using a

” hex key turn

compression screw counterclockwise while keeping the glass tube
centered between the bottom and top gaskets. Re-install end fittings,
valve and shields.

repair

7450 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 engi-
neering 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 difficult
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 specific application.

Float types and orientations

7450 Series

Installation Instructions

Maximum Non-Shock Pressure and Temperature

Temperature

Pressure

200° F

200 psig

Ambient Temp. 33° F -125° F

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 difficult 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

specific application.

7450 meters that require repair should be sent to the factory. Please call for a

Return Merchandise Authorization (RMA) number and return instructions.

-7450 Series meters have o-ring seals. Use with incompatible fluids may cause

o-rings to swell which may cause glass tube to fail.

1) Inspect meter for damage that may have occurred during shipping.

Report any damage to the container to the freight carrier immediately.

This is important information. Read it carefully

before beginning work.

2) Make sure your pressure, temperature, fluid and other

requirements are compatible with the meter 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 flow 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.

f) 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 fluid leaks at the threaded connections.

4) Handle the meter carefully during installation.

a) Use an appropriate amount of teflon 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) Meters with stainless steel fittings will support several feet of pipe

as long as significant vibration or stress resulting from misaligned pipe

are not factors.

EPR

225 °F

Buna-N

Viton

Kalrez

275 °F

350 °F

400 °F

Non-valve
Inlet / Outlet Valve

4,000 psig
1,500 psig

Maximum Non-Shock

Pressure and

Temperature

O-Ring Temperature

Ambient

temperature

33° F - 125° F

Viton and Kalrez are registered trademarks of DuPont Dow

Elastomers.

O-Ring Material

Maximum

Temperature

Meters are not specifically recommended for service other than

water or air. The user must determine meter suitability for use

with other fluids.

e) It is recommended to install valving which will allow the meter to

be drained. Meter should be drained when not in use or prior to

maintenance.

7) 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

float 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 flow in gas

service, it is necessary to know the pressure right at the outlet of the

meter (before the valve).
8) Pressure and temperature maximums must never be exceeded.

-Extra caution must be exercised when meters are used in high pressure gas

cylinder applications. Pressure regulators should be installed at the cylinder and

at the inlet of the meter.

-Serious property damage and great personal injury could occur as the result of a

meter misused or used in an unsuitable application.

LP FLOAT

Maximum flow

meter capacity

with limited

viscosity immunity

OUTLET END FITTING

O-RING
COMPRESSION FITTING
COMPRESSION SEAT

INLET SEAL
INLET FLOAT STOP /
INLET END FITTING
SIDE PLATE /

SIDE PLATE
SCALE SIDE PLATE

OUTLET SEAL
OUTLET FLOAT STOP
FLOAT STOP /

FLOAT
GLASS METER TUBE

SHIELD (CLEAR)
SHIELD (WHITE)
END FITTING
END FITTING NUT
SCALE BRACKET

SCALE BRACKET
SCALE PLATE

SCALE PLATE
VALVE ASSEMBLY

OUTLET END FITTING

O-RING
COMPRESSION FITTING
COMPRESSION SEAT

INLET SEAL
INLET FLOAT STOP /
INLET END FITTING
SIDE PLATE /

SIDE PLATE
SCALE SIDE PLATE

OUTLET SEAL
OUTLET FLOAT STOP
OUTLET FLOAT STOP /

FLOAT
GLASS METER TUBE

SHIELD (CLEAR)
SHIELD (WHITE)
END FITTING
END FITTING NUT
SCALE BRACKET

SCALE BRACKET
SCALE PLATE

SCALE PLATE

BLOCK

EXTENSION ASSEMBLY
BLOCK
SHIELD SCREW

HOLDER
EXTENSION ASSEMBLY

SCREW

BLOCK

EXTENSION ASSEMBLY
BLOCK
SHIELD SCREW

HOLDER
EXTENSION ASSEMBLY

SCREW

GV FLOAT

Highest immunity

to viscous fluids

with medium

capacity.

SL FLOAT

Maximum flow

meter capacity

with limited

viscosity immunity

2X
2X

Carefully remove the flowmeter from the piping system. Remove the front and

back shield. Remove the end fittings using a

" wrench. Using a

" hex key,

back off the compression screw by turning counter clockwise. This will release

the compression of the glass tube. Carefully remove the screws that hold the

outlet block. Remove the outlet block and internals. Remove glass tube.
Valve Models: Remove valve from the bottom block using a

" open ended

wrench. Disassembly of valve is not recommended. Outer valve o-ring should be

replaced during meter maintenance and cleaning.

To reassemble, position the glass tube on the bottom block and center onto

bottom gasket. Insert float, if on a guide rod make sure the bottom end of the

guide rod is inserted into the center hole of the bottom float stop. Re-install the

outlet block. Using a

" hex key turn compression screw counterclockwise while

keeping the glass tube centered between the bottom and top gaskets. Re-install

end fittings, valve and shields.

All components are now fully accessible for cleaning. Components can be

cleaned with a mild soap solution. This will be an effective cleaner of rust stains.

a bottle brush may be helpful in cleaning the inside of the glass tube. Caution

must be used so that materials of construction are not damaged by cleaning

solutions. Hard water deposits can be removed with a 5% acetic acid solution

(vinegar). Before the meter is reassembled, inspect all parts for damage. O-rings

should be replaced during meter maintenance and cleaning.