Product Description
Safety valve is a valve mechanism which automatically releases a
substance from a boiler, pressure vessel, or other system, when the
pressure or temperature exceeds preset limits.It is one of a set of
pressure safety valves (PSV) or pressure relief valves (PRV), which
also includes relief valves, safety relief valves, pilot-operated
relief valves, low pressure safety valves, and vacuum pressure
safety valves.Safety valves were first used on steam boilers during
the Industrial Revolution. Early boilers operating without them
were prone to accidental explosion.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. When sizing a vacuum safety
valve, the calculation method is not defined in any norm,
particularly in the hot CIP / cold water scenario, but some
manufacturers have developed sizing simulations.