Cat pump thermal relief valve4/6/2024 Vacuum safety valves (or combined pressure/vacuum safety valves) are used to prevent a tank from collapsing while it is being emptied, or when cold rinse water is used after hot CIP (clean-in-place) or SIP (sterilization-in-place) procedures. Early boilers operating without them were prone to explosion unless carefully operated. Safety valves were first developed for use on steam boilers during the Industrial Revolution. A leak tight, lower cost, single emergency use option would be a rupture disk. Pilot-operated relief valves are a specialized type of pressure safety valve. An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance from a boiler, pressure vessel, or other system, when the pressure or temperature exceeds preset limits. A safety valve is a valve that acts as a fail-safe.
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