Internal Safety Valve Model 96311

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Model 96311 Internal Safety Valve is applicable wherever liquids are stored or transferred. It is an essential safeguard against the hazards of exposure fire and a valuable aid in accident prevention.

Technical Data

Sesco SKU:tp-026 Category: Brand:

Available on backorder


Model 96311 is available in standard sizes of 2″, 3″, 4″, 6″, 8″, 10″ and 12″. Construction includes a steel body, stainless steel spring and stainles steel overlay on pallet and valve seat. The unique stem design has a center pivot and a nylon bearing to resist the effects of corro-sion fouling. New linkage design provides maximum clearance for high flow capacity.
The valve is opened manually and is held open by a chain and fusible link. The link releases at 100°C or at other temperatures as required and the spring loaded valve automatically closes. When opening the valve against a blocked line, the pilot pallet, opens first which equalizes the pressure across the main pallet allowing the valve to be opened the rest of the way with minimum effort.

All flanges are raised face to match ANSI 150 pound series permitting mounting on standard API single flange nozzles.
Extra large mounting flanges are available for use where internal piping is required for connection to suction heaters, blending spiders, etc. Any of the flanges can be specified blank for welding.

Features & Benefits

  • Unique stem guide maximizes flow
  • Spring loaded valve automatically closes in event of fire
  • Pilot pallet reduces effort to open against tank pressure in blocked line.
  • Fire proven ANSI flanges
  • Standard 2” – 12″ sizes, up to 30” available
  • Special steels available for refrigerated service
  • Atex Certification available on request


Internal Safety Valve Setting Range:

  • Model number: Model 96311
  • Sizes Available: 2”, 3”, 4”, 6”, 8”, 10”, 30”
  • Connections: API, RF ANSI 150
  • Pressure: 3.5 Bar Max.
  • Temperature Range: -20ºC to 260ºC