FIELD: gas supply systems.
SUBSTANCE: system comprises three stop valves with the drain connecting pipes that are interconnected so that the normally open valve whose inlet is connected with the gas supply source and output is connected with the inputs of the second and third normally closed valves is mounted upstream of the other two valves. The outlet of the second valve is connected with the consumer. The outlet of the third valve is connected with the drain connecting pipe of the second valve. The drain connecting pipes of the first and third valves are interconnected and are in communication with the atmosphere.
EFFECT: enhanced reliability.
1 dwg
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