Usually pressure safety valves tend to leak more after being triggered for the first time.
Rupture disc installed below the pressure safety valve.In the case of over-pressurization, if the pressure safety valve fails to operate or unable to relieve excess pressure fast enough, the rupture disc will come into action and burst controlling the pressure.Rupture disc installed parallel to the pressure safety valve.Rupture discs and safety valves can be combined in two different configurations: Rupture discs can be used to specifically protect installations against unacceptably high pressures or can be designed to act as one-time valves or triggering devices to initiate with high reliability and speed a sequence of actions required.Rupture disc can be used for isolating the high-cost valves from the process in case of over-pressurization, thereby saving on valve maintenance and replacement.
Rupture discs can be used as a single pressure protection device or as a combination with pressure safety valve. For more on Pressure Safety Valves, check out Introduction to Pressure Safety Valves. Rupture discs are also known as a pressure safety disc, burst disc, bursting disc, or burst diaphragm. Major advantages of the application of rupture discs compared to using pressure relief valves include fail-safe performance, leak proof and most economical (cost-wise). A rupture disc is a non-re-closing pressure relief device that protects a pressure vessel, equipment or process piping system from over-pressurization or potentially damaging vacuum conditions. Rupture discs are, next to pressure safety valves, the most commonly used pressure protection devices in industrial plants. A rupture disc has a one-time-use membrane that fails at a predetermined differential pressure, either positive or vacuum. Rupture discs provide instant response to over-pressurization or under-pressurization in process piping system, but once the disc has ruptured it will not reseal.
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