POTTED CIRCUIT Russian patent published in 2017 - IPC G01M3/00 

FIELD: machine building.

SUBSTANCE: device comprises a casing (1), at the end (2) of which there is a hollow (3) communicated with the inner cavity (4) of the casing (1). A catch pin (5), the entire outer surface (6) of which is cylindrical, and two radial sealing rings (7, 8) of elastomeric material are located in the hollow (3). Wherein one of the sealing rings (7) is placed in a groove (9). On the casing (1) a union (10) for fluid supply is located with channel (11) outgoing to cavity of the boring (3) at area between the sealing rings (7, 8). The catch pin (5) is provided with a chamfer (13) and mounted with the ability of axial movement relative to the casing (1) and fixing in two positions: in initial, when channel (11) of the union (10) is connected with internal cavity (4) of the casing (1), and final, when the channel (11) of the union (10) is isolated from the internal cavity (4). A stop (15) is made to limit axial movement of the pin (5) in the device. A dual stage bore back (15) is made in the hollow (3) on the end (2) side of the casing (1). The width of the first stage (16) of the bore back (15) is equal to the width of the hollow (3) groove (9) and the diameter of the first stage (16) is equal to the groove (9) outer diameter. The diameter of the second bore back (15) stage (17) opening onto end (2) of the casing (1) is greater than the diameter of the first stage (16). Stopper (18) with the thrust into a throat (19) between the stages (16, 17) of the bore back (15) is arranged inside the second stage (17) of the bore back (15) coaxially to the hollow (3). The sleeve (18) is provided with a lock (20) of the axial position placed outside the cylinder (21) formed by the surface of the hollow (3). The inner diameter of the stopper (18) is equal to the diameter of the hollow (3). The second O-ring (8) is located inside the first stage (16) of the hollow (15).

EFFECT: increase of device manufacturability with repeated usage.

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