They are used for automatic shut-off of the pipeline in case of emergency change of pressure of the working medium. The valves provide a high degree of gas well protection regardless of the degree of field automation and availability of electricity. They are used to shut off pipelines as shut-off pipeline valves shutting off the flow of liquid or gaseous working medium, including flammable and combustible, transported through process pipelines, pipelines of oil and gas fields and underground gas storage facilities at operating pressure Pp not exceeding 105 MPa (1050 kgf/cm2) and temperature not exceeding plus 120 ° C (briefly plus 180 ° C), as well as for shutting off pipelines in the technological systems of surface facilities on the sea shelf, including offshore floating oil and gas production complexes (FOC), floating drilling rigs (FDR) and offshore fixed platforms (OSP).
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