System for calibrating pressure transducer

Claim 2

A pressure transducer calibration system comprising: pressure transducer means having an active side and a reference side; selector valve means small enough to be placed immediately adjacent said pressure transducer means; means connecting said selector valve means with the active side of said pressure transducer means; a source of known pressure connected to said selector valve means; a source of test pressure connected to said selector valve means; a source of reference pressure connected to the reference side of said pressure transducer means and to the selector valve means; means for operating said selector valve to selectively admit said reference pressure, said known pressure and said test pressure to the active side of said pressure transducer to accurately calibrate said pressure transducer located in a test environment and means for reading the output of said transducer.

Claim 3

A pressure transducer calibration system as in claim 1 wherein said means for operating said selector valve means is a source of operating pressure controlled by pressure distribution means.

Claim 4

A pressure transducer calibration system as in claim 2 wherein said selector valve means has slider means; said slider means having ports which selectively register with said reference pressure, said known pressure, said test pressure and being joined with said means connecting the selector valve means with the active side of said transducer means; said slider means being attached to actuator means; said actuator means being operable under the influence of said operating pressure to move said slider means ports to register with said reference pressure, said known pressure and said test pressure.

Claim 5

A pressure transducer calibration system as in claim 3 wherein said actuator means includes first and second cylinder means; piston means operable in said first and second cylinder means, one of said piston means movable a predetermined distance under said operating pressure to position said slider means; and the other piston means movable a predetermined further distance under said operating pressure to further position said slider means.

Claim 6

A pressure transducer calibration system as in claim 4 wherein said first and second piston means are associated with yoke means, said yoke means carrying connecting means with said slider means; bias means connected to said yoke means and selector switch means to move said slider means to another predetermined position in the absence of operating pressure.

Claim 7

A pressure transducer calibration system as in claim 4 wherein said pressure distribution means directs operating pressure to first one cylinder and then to another cylinder.

Claim 8

A pressure transducer calibration system as in claim 2 wherein operating pressure is directed to multiple selector valve means associated with multiple pressure transducer means by said distribution means.

Claim 9

A pressure transducer calibration system as in claim 3 wherein said means connecting said selector valve means with the active side of said pressure transducer means is flexible conduit means.

Claim 10

A pressure transducer calibration as in claim 5 wherein one of said piston means floats in one of said cylinder means; said yoke means having first and second rod means the first of which is connected to one of said piston means and the second of which has mating engagement with said floating piston means and being movable relative thereto; and collar means attached to said second rod means.

Claim 11

A pressure transducer calibration system as in claim 9 wherein said first and second cylinder means have flange means; said floating piston means engaging said collar means and moving said yoke means and thereby said slider means until said floating piston means engages one of said cylinder flange means thereby locating said slider means at a predetermined position; said other piston means moving said yoke means and thereby said slider means further until said other piston means engages the other cylinder flange means thereby locating said sliDer means at another predetermined position.

Claim 12

In a pressure calibration system for a differential pressure transducer wherein the reference side of said transducer is supplied with a reference pressure and wherein the active side of said transducer is selectively supplied with said reference pressure to verify the accuracy of said transducer at zero differential pressure; with a known pressure to verify the accuracy of said transducer at said known pressure; and with a test pressure which said transducer monitors for information purposes: a selector valve means for selectively supplying said three pressures to said active side of said transducer comprising a slider means; said slider means having ports which selectively register with said reference pressure, said known pressure, and said test pressure and said ports being joined with a connecting means said connecting means connecting said selector valve means with the active side of said transducer; said slider being attached to actuator means; said actuator means being operable under the influence of operating pressure to move said slider means ports to register with said reference pressure, said known pressure and said test pressure.

Claim 13

In a pressure calibration system for a differential pressure transducer wherein the reference side of said transducer is supplied with a reference pressure and wherein the active side of said transducer is selectively supplied with said reference pressure to verify the accuracy of said transducer at zero differential pressure; with a known pressure to verify the accuracy of said transducer at said known pressure; and with a test pressure which said transducer monitors for information purposes: a selector valve means for selectively supplying said three pressures to said active side of said transducer comprising a slider means; said slider means having ports which selectively register with said reference pressure, said known pressure, and said test pressure and said ports being joined with a connecting means said connecting means connecting said selector valve means with the active side of said transducer; said slider being attached to actuator means; said actuator means being operable under the influence of operating pressure to move said slider means ports to register with said reference pressure, said known pressure and said test pressure.

Claim 14

A selector valve means as in claim 11 wherein said actuator means includes first and second cylinder means; piston means operable in said first and second cylinder means, one of said piston means movable a predetermined distance under said operating pressure to position said slider means; and the other piston means movable a predetermined further distance under said operating pressure to further position said slider means.

Claim 15

A selector valve means as in claim 12 wherein said first and second piston means are associated with yoke means, said yoke means carrying connecting means with said slider means; bias means connected to said yoke means and selector switch means to move said slider means to another predetermined position in the absence of operating pressure.

Claim 16

A selector valve means as in claim 11 wherein said operating pressure is directed to first one cylinder and then to another cylinder.

Claim 17

A selector valve means as in claim 13 wherein one of said piston means floats in one of said cylinder means; said yoke means having first and second rod means the first of which is connected to one of said piston means and the second of which has mating engagement with said floating piston means and being movable relative thereto; and collar means attached to said second rod means.

Claim 18

A selector valve means as in claim 15 wherein said first and second cylinder means have flange means; said floating piston means engaging said collar means and moving said yoke means and thereby said slider means until said floating piston means engages one of said cylinder flange means thereby locating said slider means at a predetermined position; said other piston means moving said yoke means and thereby said slider means further until said other piston means engages the other cylinder flange means thereby locating said slider means at another predetermined position.