FIELD: machine building.
SUBSTANCE: pipeline (17) of high pressure (HPP) and pipeline (18) of low pressure (LPP) of main are connected to drain tube (8) coupled with cavity of ball cock (9) by means of pulse tube (10) of high pressure (HPPT) and pulse tube (11) of low pressure (LPPT). Three valves (1, 2, 5) and flow metre (14) are installed in the drain tube. Two by-pass tubes (12, 13) with valves are arranged parallel to the drain tube. By switching corresponding valves transported medium is first directed downstream through the first packing (20) of cock (9) and further through the second packing (21) of the cock. Also fluid medium always flows from inlet to outlet of the flow metre (for example, vortex or heat one), which readings are accepted as value of medium leaks though a ball cock.
EFFECT: facilitating control of leaks through each packing of ball cock.
2 cl, 1 dwg
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