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Патент USA US2405979

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Aug. 21011946.
Filed March 22, 1943"‘
~ 2,405,979
Patented Aug. 20, 1946
Albert J. Rosenberger, Chicago, 111., assignor to
Republic Flow Meters Company, Chicago, 111.,
a corporation of Illinois
Application March 22, 194-3,iSerialNo. 480,048‘
2 Claims. (01. -137'-‘-'15s)
This invention relates to pressure reproducing
instrument and more particularly to instruments
for reproducing ?uid pressures for transmission
to remote points.
In measuring pressures or di?eretial pressures
of ?uids, it is frequently desirable to transmit
used for connection to a similar indicating in
strument if desired.
A diaphragm shown as a sealed flat capsule l‘!
is mounted in the interior of the casing on the
upper end of a hollow post [8 which extends
through the base plate It. As shown, one side
of the diaphragm is rigidlysecured to the post
the pressure to some distant point for actuation
while the other side carries a connecting member
of an indicating instrument. In the case of ?uids
t9 freely movable in the casing as the differen
which are noxious, explosive or corrosive, it is
not desirable to conduct the main ?uid any sub 10 tial pressure‘across the diaphragm changes. The
hollow post I8 ‘is adapted to be connected to a
stantial distance .through conduits or the like
source of pressure to be reproduced.
and it is, therefore, one of the principal objects
The casing is formed with a pair of openings
of the present invention to provide an instru
in one of which there is secured a tube 2!] pro
ment which will reproduce in air or other inert
?uid the pressure of the primary ?uid.
15 jecting into the interior of the casing and ter
Another object of the invention is to provide
a pressure reproducing instrument including a
?exible diaphragm in which the pressures on op
minating in a restricted nozzle ori?ce 2!. The
other opening is connected through a restricted
ori?ce 22 with a conduit 23 on the exterior of
the casing. The nozzle ori?ce 2i is adapted to
this construction, the diaphragm is not subjected
be controlled by a ?apper valve shown as a lever
posite sides of the diaphragm are the same.
24 pivoted at 25, to a post 26 in the casing with
its free end overlying the nozzle 2!. The lever
is pivotally connected intermediate its length to
Another object of the invention is to provide
the connecting member [-9 to be moved thereby
a pressure reproducing instrument which can re
produce a pressure either above or below atmos 25 toward and away from the control ori?ce as the
to any strain during operation and may be com
pletely sealed.
capsule expands and contracts.
Movement of the lever 24 away from the ori?ce
is limited by a bracket 2i secured to the post 26
with its end overlying and spaced from the lever.
be easily adjusted to reproduce the pressure ex
actly or to reproduce a pressure varying from the 30 The bracket carries an adjusting screw 28 bear
ing against a leaf spring 29 which is secured to
primary pressure by a given di?erential amount.
the lever 24 so that by adjustment of the screw
A further object of the invention is to provide
28 the spring 29 will urge the lever toward the
a pressure reproducing instrument including a
control ori?ce with a variable resilient force.
diaphragm whose movement is limited to a very
If a pressure above atmospheric is to be re
small amount.
produced, a source of actuating ?uid such as air
The above and other objects and advantages
under pressure is connected to the tube 20 and
of the invention Will be more readily apparent
the conduit ‘23 is left open to atmosphere. The
from the following description when read in con
pressure to be reproduced is conducted to the
nection with the accompanying drawing, in which the single ?gure is a sectional view of a pressure 40 interior of the capsule ll and tends to expand it
to move the valve member 24 away from the ori
reproducing instrument embodying the inven
?ce 2| to reduce the restriction of the ori?ce.
Since the ori?ce 22 is ?xed, the pressure in the
The instrument, as shown, comprises a closed
casing will increase until it balances exactly the
casing made up of a base plate I9 having a
pressure in the capsule, at which time, the valve
mounting bracket l l at one side thereof and
member 24 will move to a position to maintain
sealing against a cup-shaped member l2 to form
the desired balance of pressures. The pressure
a hollow closed casing. The cup-shaped mem
in the casing is conducted to the gauge or indi
loer l2 may be held against the base plate by
cating instrument through the conduit l5. Thus
the top plate I3 which is secured to the base
the pressure conducted to the remote point is air
plate by elongated bolts Hi.
Still another object of the invention is to pro
vide a pressure reproducing instrument which can
pressure and the only objectionable ?uid is that
which is conducted to the interior of the capsule
through the post l8. The post and capsule and
point by a conduit connected to a nipple IS in
the necessary connecting piping can be formed of
the base plate. A similar nipple I6 is shown as
mounted in the top of the casing and could be 55 a material which is not affected by the fluid being
The interior of the casing may be connected
to a gauge or indicating instrument at a remote
measured and since the remainder of the sys
tem contains only air, it is not necessary to use
any special corrosion resisting material.
What is claimed is:
The adjusting screw 28 and spring 29 are em
ployed to adjust the zero setting of the instru
ment by applying a bias force to the capsule. If
there is any variation in the size of the capsules
or in the mounting; this may easily be com
pensated for by adjusting the screw 28 so that
the pressure in the casing will be exactly the 10
same as that on the capsule interior.
If de- _ '
sired, however, this mechanism may be utilized
1. A pressure reproducing instrument com
prising a hollow casing formed with an open
ing communicating with a source of pressure and
an opening communicating with atmosphere, a
?exible closed capsule in the casing connected
to a source of pressure to be reproduced, a tube
in, the casing connected to one of the openings
and terminating in a control ori?ce, a valve mem
ber in the casing connected to the capsule to be
moved thereby and cooperating withlthe control
ori?ce to vary the ?ow therethrough, and ad
justable resilient means acting between the valve
member and a part ?xed relative to the casing
to provide unequal pressures on the interior and
exterior of the capsule by preloading the capsule
to some value other than a balanced neutral
to bias the valve member in one direction.
condition. In this case, the pressure maintained
in the casing will always differ fromthatin the .
ing a hollow casing formed with an opening com
capsule by a predetermined di?erential amount, '
municating with a source of pressure and an
2.'A pressure reproducing instrument compris
depending upon the adjustment of the spring.‘
opening communicating with atmosphere, a flat
When the pressure to be transmitted is be 20 sealed capsule in the casing having one side ?x
low atmospheric, the tube 20 is vented to the
edly supported and its other side free to move,
atmosphere and the conduit 23 is connectedto‘a
means extending into the casing for connecting
vacuum pump or the like. Adjustment‘ of the
the interior of the capsule with a pressure to be
valve will permit bleeding of air intothe cas
reproduced, valve means connected to said other
ing through the ori?ce 2|v to relieve the, vacuum.
side of the capsule for controlling one of the
Operation of the valve will maintain the pressure
openings and moved in an opening direction by
in the casing the same as that on the interior.
expansion of the capsule a ?xed stop engageable
of the capsule in the same manner as when a
with the valve means to limit expansion of the
super-atmospheric pressure is employed.
capsule, and adjustable resilient means acting be_
While one embodiment of the invention has .30 tween the stop and the valve means yieldingly to
been shown and described, it will be understood ‘ oppose expansion of the capsule.
that this is illustrative only and is not intended
to be taken as a de?nition of the scope of the
invention, reference being had for this purpose
to the appended claims.
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