SVI Safety Valves

Watson McDaniels

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The SVI Safety Relief Valves are used for over-pressure protection on unfired pressure vessels in saturated steam systems.

Catalog Spec Sheet (pdf)

I&M (pdf)


• Stainless Steel wetted trim nozzle & disc
• Metal to metal seating, lapped to optimum flatness
• Tapped body drain allows piping of condensate away from valve to protect the internals from fouling
• Two control rings assure maximum performance and adjustability

How It Works

In the event steam pressure increases to the set point, the safety valve will “pop open” discharging steam faster than it can be produced; allowing system pressure to return to safe levels at which point the valve will close.




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