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SVI

SVI Safety Valves

The SVI Safety Valves are used for over-pressure protection on unfired pressure vessels in saturated steam systems. Valves are 100% factory tested and made in the USA.

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.

Features

  • 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

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

ModelInlet Pipe SizeInlet TypeOutlet Pipe SizeOutlet TypeOrifice SizeMax PMO (psig)Max Capacity (lb/hr)Weight (lbs)
SVI-16F-18S-J1 1/2"250# FLG2 1/2"FNPT1.258" (J)2501778935
SVI-17F-19S-K2"250# FLG3"FNPT1.926" (K)2502522936
SVI-17S-19S-K2"FNPT3"FNPT1.926" (K)2502522937
SVI-18F-19S-K2 1/2"250# FLG3"FNPT1.926" (K)2502522941
SVI-19F-19S-K3"250# FLG3"FNPT1.926" (K)2502522945
SVI-18F-20S-L2 1/2"250# FLG4"FNPT2.990" (L)2503916784
SVI-18S-20S-L2 1/2"FNPT4"FNPT2.990" (L)2503916781
SVI-19F-20S-L3"250# FLG4"FNPT2.990" (L)2503916785
SVI-20F-20S-L4"250# FLG4"FNPT2.990" (L)2503916790
SVI-19S-20S-M3"FNPT4"FNPT3.774" (M)2504943780
SVI-19F-20S-M3"250# FLG4"FNPT3.774" (M)2504943787
SVI-20F-20S-M4"250# FLG4"FNPT3.774" (M)2504943795
SVI-20F-22F-N4"250# FLG6"125# FLG4.550" (N)25059602210
SVI-20F-22F-P4"250# FLG6"125# FLG6.692" (P)25087661215
SVI-22F-23F-Q6"250# FLG8"125# FLG1.593" (Q)250151861530
SVI-22F-23F-R6"250# FLG8"125# FLG16.798" (R)250219886530
Product Overview
The SVI Safety Valves are used for over-pressure protection on unfired pressure vessels in saturated steam systems. Valves are 100% factory tested and made in the USA.
Features
• 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.
Selection/Sizing/Capacities

Notes:

1) Ratings are 90% of actual capacity.
2) For Set Pressures over 250 PSIG, consult factory.
3) For other sizes,  consult factory.
4) ASME Section I – Steam Boilers – pounds of saturated steam per hour @ 3% or 2 PSIG accumulation (whichever is greater).
5) ASME Section VIII – Pressure Vessels – pounds of saturated steam per hour @ 10 % or 3 PSIG accumulation (whichever is greater).



Dimensions and Weights

Sample Specification
Safety valves shall be high capacity design with cast iron construction featuring rust-proof stainless steel stems, springs, washers and metal-to-metal lapped seats. Units shall be qualified to the ASME Boiler Code Section VIII and suitable for steam service.