초록 ▼

A pressure testing apparatus including a twin cylinder accumulator assembly having a first cylinder and a first piston dividing the first cylinder into first and second chambers. The first chamber communicates with a test specimen and contains a first fluid. The twin cylinder accumulator assembly al

A pressure testing apparatus including a twin cylinder accumulator assembly having a first cylinder and a first piston dividing the first cylinder into first and second chambers. The first chamber communicates with a test specimen and contains a first fluid. The twin cylinder accumulator assembly also includes a second cylinder coaxial with the first cylinder and a second piston which divides the second cylinder into third and fourth chambers and which is connected to the first piston by a common piston rod. The fourth chamber communicates with a hydraulic pressure unit and is supplied with alternating high and low pressures to cyclically pressurize the first fluid in the fourth chamber and the test specimen communicating therewith. A switch actuator is mounted on the piston rod for actuating first and second proximity sensors to monitor piston rod movement. In the event of a leak in the specimen causing the piston rod to exceed its normal stroke when compressing the fluid in the first chamber, the switch actuator actuates the first proximity sensor to signal a control unit to open a valve to permit make-up fluid to be pumped into the system. The second valve remains open until the piston rod is moved in the reverse direction a distance sufficient to cause the switch actuator to actuate the second proximity sensor to signal the control unit to close the second valve.

대표청구항 ▼

An apparatus for pressure testing a specimen, said apparatus utilizing different first and second fluids, said first fluid being used to pressurize the specimen and said second fluid being used to pressurize said first fluid, the mixing of said fluids being undesirable, said apparatus comprising a f

An apparatus for pressure testing a specimen, said apparatus utilizing different first and second fluids, said first fluid being used to pressurize the specimen and said second fluid being used to pressurize said first fluid, the mixing of said fluids being undesirable, said apparatus comprising a first cylinder, a first piston dividing said first cylinder into first and second chambers, said first chamber containing said first fluid, a second cylinder, a second piston dividing said second cylinder into third and fourth chambers, means connecting said pistons such that the volume of said first chamber increases in response to a decrease in the volume of said fourth chamber and such that the volume of said first chamber decreases in response to an increase in the volume of said fourth chamber, means for selectively supplying said second fluid under pressure to said fourth chamber, a conduit having one end communicating with said first chamber and having an opposite end adapted to communicate with the specimen, and means separate from said first cylinder for supplying an additional amount of said first fluid to the specimen in the event of a leak including means for sensing the distance said first piston moves when said second fluid is supplied to said fourth chamber, and make-up means for supplying said additional amount of said first fluid when said distance is greater than a predetermined distance.