Cryoseal 3X

Triple Offset High Performance Butterfly Valve for LNG

The Westad butterfly valve for cryogenic service is designed for tight shut off and throttling service.

The disc movement is triple offset. This eliminates concentrated wear points on the sealing ring and extends it’s lifetime. Standard body patterns are flanged and butt welded types.

Butt welded type has extended body to prevent heat conduction to the sealing area during welding installation. An inspection door on top of the body enables easy inspection, maintenance and replacement of all inner parts and disc without the need to remove the valve or to cut the pipe.

To prevent internal stress in the bonnet during the cool- down period, all bonnet joints are bolted. This bonnet is extended to ensure that the gland area remains free from freezing even for temperatures down to -196 ̊C.

The valve can be installed with the shaft in any direction. The topflange drilling is according to ISO 5211 standards to fit a large range of gears and actuators.

 

Specifications

Temperature range: -196°C to +200°C
Pressure range: ANSI Class 150 / 300 / 600
Standard size range: 4" (DN100) - 48" (DN 1200)
Face to face dimensions:

Butt welded type according to drawing
Flanged type according to ISO 5752, serie 14

Materials

Body:

Butt welded type: Stainless Steel ASTM A351 CF3M
Flanged type: Stainless Steel ASTM A351 CF8M

Disc: Stainless Steel ASTM A351 CF8M, stellited
Shaft: Stainless Steel AISI 316
Nuts and bolts: Stainless Steel AISI 316
Shaft seal: Grafoil (graphite)
Main seal:

Laminated Metal/Graphite
Solid Metal

LNG Terminal


The Shandong LNG terminal is Sinopec's first and has 7 Westad Cryoseal valves.

Cryogenic testing


Cryogenic testing at our plant in Norway.


The Cryoseal valve after testing.

Sealings


Laminated or Solid Metal Seal


Laminated metal / graphite


Solid metal