SVI | Safety Relief Valves | Pipeline Accessories

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SVI

Introduction

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

SVI Series

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

Model	Inlet Pipe Size	Inlet Type	Outlet Pipe Size	Outlet Type	Orifice Size	Max PMO (psig)	Weight (lbs)
SVI-16F-18S-J	1 1/2"	250# FLG	2 1/2"	FNPT	1.258" (J)	250	35
SVI-17F-19S-K	2"	250# FLG	3"	FNPT	1.926" (K)	250	36
SVI-17S-19S-K	2"	FNPT	3"	FNPT	1.926" (K)	250	37
SVI-18F-19S-K	2 1/2"	250# FLG	3"	FNPT	1.926" (K)	250	41
SVI-19F-19S-K	3"	250# FLG	3"	FNPT	1.926" (K)	250	45
SVI-18F-20S-L	2 1/2"	250# FLG	4"	FNPT	2.990" (L)	250	84
SVI-18S-20S-L	2 1/2"	FNPT	4"	FNPT	2.990" (L)	250	81
SVI-19F-20S-L	3"	250# FLG	4"	FNPT	2.990" (L)	250	85
SVI-20F-20S-L	4"	250# FLG	4"	FNPT	2.990" (L)	250	90
SVI-19S-20S-M	3"	FNPT	4"	FNPT	3.774" (M)	250	80
SVI-19F-20S-M	3"	250# FLG	4"	FNPT	3.774" (M)	250	87
SVI-20F-20S-M	4"	250# FLG	4"	FNPT	3.774" (M)	250	95
SVI-20F-22F-N	4"	250# FLG	6"	125# FLG	4.550" (N)	250	210
SVI-20F-22F-P	4"	250# FLG	6"	125# FLG	6.692" (P)	250	215
SVI-22F-23F-Q	6"	250# FLG	8"	125# FLG	1.593" (Q)	250	530
SVI-22F-23F-R	6"	250# FLG	8"	125# FLG	16.798" (R)	250	530

Downloads

Catalog Spec Sheet (pdf)

I&M (pdf)

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

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.