Safety valve-fittings designed to protect against mechanical destruction of equipment, pipelines or tanks from excessive pressure by automatically discharging excess liquid, vapor and gaseous medium from systems and vessels with pressure above the established pressure. The valve should also ensure that the discharge of the medium stops when the operating pressure is restored. The safety valve is a direct acting armature that works directly from the working environment, along with most safety valve designs and direct-acting pressure regulators. Dangerous overpressure can occur in the system as a result of external factors (improper operation of the equipment, heat transfer from outside sources, improperly assembled thermomechanical scheme, etc.), and as a result of internal physical processes caused by some initial event not provided for by normal exploitation.
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