Abstract A pressure gauge protector assembly is provided for measuring the pressure of a fluid without having the fluid come into direct contact with the pressure-measuring gauge. The assembly includes a transparent casing having an inner cavity in which a flexible diaphragm is mouunted to divide the cavity into two chambers. One of the chambers is provided with inlet and outlet openings so that the fluid to be measured can flow through the first chamber, and the second chamber is provided with an opening which is connected to a pressure-measuring gauge by a fluid conduit. The pressure of the fluid to be measured displaces the flexible diaphragm from its original unflexed position, and fluid injecting means are connected to the fluid conduit for injecting fluid into the second chamber until the diaphragm is displaced toward its original position against the pressure of the fluid in the first chamber. The pressures of the fluids within the two chambers are then equal, and the pressure-measuring gauge will indirectly measure the pressure of the fluid within the first chamber.
A gauge protector assembly for measuring the pressure of a fluid by a gauge without having the fluid contact the gauge comprising a casing having an inner cavity and inlet and outlet openings communicating with the cavity, a flexible diaphragm secured to the casing within the cavity and dividing the cavity into first and second chambers, at least a portion of the casing being transparent to permit the diaphragm to be observed from outside of the casing, both of the inlet and outlet openings communicating with the first chamber but not the second chamber to provide a first fluid flow passage through the first chamber between the inlet and outlet openings, the casing being provided with a third opening communicating with the second chamber but not the first chamber, conduit means connected to the third opening and adapted to be connected to a pressure gauge to provide a second fluid flow passage through the third opening between the second chamber and the conduit means, and means for injecting a fluid into the second fluid flow passage whereby the fluid to be measured can be connected to the first fluid flow passage so that the pressure thereof acts on the diaphragm and fluid can be injected into the second fluid flow passage by the fluid injecting means until the pressures in the first and second chambers are equal.
Claim 2
Dependent Claim
227 words
A gauge protector assembly for measuring the pressure of a fluid by a gauge without having the fluid contact the gauge comprising a casing having an inner cavity and inlet and outlet openings communicating with the cavity, a flexible diaphragm secured to the casing within the cavity and dividing the cavity into first and second chambers, at least a portion of the casing being transparent to permit the diaphragm to be observed from outside of the casing, both of the inlet and outlet openings communicating with the first chamber but not the second chamber to provide a first fluid flow passage through the first chamber between the inlet and outlet openings, the casing being provided with a third opening communicating with the second chamber but not the first chamber, conduit means connected to the third opening and adapted to be connected to a pressure gauge to provide a second fluid flow passage through the third opening between the second chamber and the conduit means, and means for injecting a fluid into the second fluid flow passage whereby the fluid to be measured can be connected to the first fluid flow passage so that the pressure thereof acts on the diaphragm and fluid can be injected into the second fluid flow passage by the fluid injecting means until the pressures in the first and second chambers are equal.
Claim 3
Dependent Claim
13 words
The structure of claim 1 in which the injecting means is a syringe.
Claim 4
Dependent Claim
22 words
The structure of claim 2 in which the conduit is provided with a self-sealing puncturable member through which the syringe is inserted.
Claim 5
Dependent Claim
16 words
The structure of claim 1 in which the fluid injected by the injecting means is air.
Claim 6
Dependent Claim
14 words
The structure of claim 1 in which the diaphragm is formed of silicone rubber.
Claim 7
Dependent Claim
38 words
The structure of claim 1 in which the inlet and outlet openings are generally aligned and the diaphragm is substantially flat when unflexed and extends generally parallel to the direction of flow between the inlet and outlet openings.