Triple Offset

Size: 2” to 48” (Larger size available on request)
Operating Temperature: 550° C (Above 550° C available on request)
Pressure Rating: As per 150# B16.34

Design Standard

The “Triple Offset” butterfly valve is available in a variety of both ANSI and PN classes, sizes and configurations.

Triple Offset Butterfly Valves are suitable for both throttling and positive isolation applications. These valves can control bidirectional flow, have zero leakage, low fugitive emissions, and work in steam-based applications up to 1022° F (550° C).

The triple offset sealing system allows the disc to move smoothly and frictionless along the specially designed body seat & disc seal. When the disc is closed, the seal ring (on the disc) energizes the seat (on the body), providing a snug-tight, high-performance fit. The laminated seal is constructed with grafoil layers sandwiched between metal laminations. This resiliency of the seal flexes and energizes according to the compressive forces generated and allows for minor body deformations due to temperature fluctuations without the risk of jamming. This provides a uniform “snap-in” effect and ensures bubble-tight shut-off.

Specifications

Size Range:
2” to 48” (Larger size available on request)
Temperature:
550° C (Above 550° C available on request)
Face to Face:
API 609 Category "B"
Body Material:
WCB/CF8/CF8M
Stem Material:
304/316/410 /17-4PH SS
Disc Material:
CF8/CF8M
Seat:
Viton/PTFE/EPDM/304+Graphoil
End Connection:
Wafer (3" to 24")
Lug type (3" to 24")
Flanged (3" to 24")
Operating:
Hand lever, Worm Gear Box
Design and Manufacturing:
API 609 / BS EN 593/AWWA C504
Inspection and Testing:
API 598/ BS EN 12266/AWWA C504/ISO 5208
Flange Standard Conformity:
ANSI B16.5/150, 300 class/BS 4504/AWWA C207
Top Mounting Standard:
ISO 5211
Leakage Class:
ASME B16, 16.104 Leakage Class VI

Design Features

  • Metal to metal sealing
  • Triple offset for quarter-turn design
  • Torque seated
  • More torque = More tightness
  • Bi-directional tight shutoff
  • Zero leakage compared to API 598
  • Speed of Operation: Variable closing speed as required
  • Non-rubbing rotation seating
  • No jamming
  • No cavities
  • Space & Weight saving compared to gate valves and ball valves
  • Inherently fire safe and fire tested
  • Less maintenance
  • Control capability

Applications

  • Process fluids
  • Hydrocarbons
  • Steam/Geothermal steam
  • Hot gas/Sour gas (NACE)
  • Blow down
  • Sulfur recovery
  • Acid, Caustic, Chloride
  • Abrasive service

Chart or Graph

VALVE TORQUE 150#
VALVE SIZE5 Bar10 Bar20 Bar
MMInchN-m

N-mN-m
502″111521
652-1/2″202838
803″384363
1004″505880
1255″73100144
1506″113144181
2008″175219350
25010″294331375
30012″400450625
CV Values
VALVE SIZE10°20°30°40°50°60°70°80°90°
MMInch
502″2511192841587785
652-1/2″292028456080120130
803″31022426496150157160
1004″6174175116174273284290
1255″64575170280478650707795
1506″751119221340510799833850
2008″41032394456841026160716761710
25010″5015135365510081515236924702520
30012″79236552102415762364370438613940
Dimensions are in mm
VALVE SIZELØEØD
MMInch
502″4750.895
652-1/2″5261.6108
803″5272127
1004″57100159
1255″60123186
1506″60143217
2008″67192270
25010″72239322
30012″75290382
Dimensions are in inch
VALVE SIZELØEØD
MMInch
502″1.882.0323.8
652-1/2″2.082.4644.32
803″2.082.885.08
1004″2.2846.36
1255″2.44.927.44
1506″2.45.728.68
2008″2.687.6810.8
25010″2.689.5612.88
30012″311.615.28