METHOD FOR DETERMINING LEVEL OF LEAKAGE THROUGH LEAKY GATE OF BALL VALVE OF SHUT-OFF AND CONTROL VALVE IN OPERATING MODE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC F17D5/02 G01F1/00 G01M3/00 

FIELD: gas industry.

SUBSTANCE: group of inventions relates to a method and device for controlling the technical condition of a shut-off and control valve; it can be used to monitor the condition of the shut-off and control valve without decommissioning it. A method for determining the level of gas leakage through a leaky gate of a closed ball valve of the shut-off and control valve of a pipeline includes measuring the pressure in a cavity of the ball valve with a pressure gauge. Then, the first valve installed in a pipe connecting a high-pressure pipeline to the valve cavity is closed, simultaneously with the opening of the second valve installed in a pipe connecting a low-pressure pipeline to the valve cavity, when measuring leakage through a seal between the valve cavity and the high-pressure pipeline. Next, the second valve is closed simultaneously with the opening of the first valve, when measuring leakage through the seal between the valve cavity and the low-pressure pipeline. When measuring leakage through the seal between the valve cavity and the high-pressure pipeline, after pressure stabilization, the method includes closing the second valve, measuring steady-state pressure P₁₁ with the pressure gauge, measuring steady-state pressure P₁₂ with the pressure gauge after a while, while, in the case of pressure inequality, it is concluded that there is a leakage, the volume of which is calculated by the formula

where V₀ is the volume of the valve cavity at certain pressure P₀. When measuring leakage through the seal between the valve cavity and the low-pressure pipeline, after pressure stabilization, the method includes closing the first valve, measuring steady-state pressure P₂₁ with the pressure gauge, measuring steady-state pressure P₂₂ with the pressure gauge after a while, while, in the case of pressure inequality, it is concluded that there is a leakage, the volume of which is calculated by the formula

EFFECT: creation of a method and device for determining the level of leakage through the leaky gate of the ball valve of the shut-off and control valve in the operating mode for diagnostics of sealing elements of the shut-off valve without decommissioning them, not resulting in emissions of the transported product into the atmosphere during the measurement process.

2 cl, 1 dwg