Butterfly Valves · Triple Offset Butterfly Valves
TC Series Triple Offset Butterfly Valves
The TC Series is the triple-offset butterfly valve execution for severe service: a metal-to-metal laminated seal (graphite/UNS31803) with hard-faced cobalt-chromium hardfacing alloy seats, built to API 609 and ASME B16.34 with a fire-safe API 607 execution. The series spans NPS 2 to 160 (DN50 to DN4000) at ASME Class 150 to 2500 (PN16 to PN420) and -196°C to +650°C, in wafer, lug, double-flanged (RF) and butt-weld ends with gear, pneumatic, electric or hydraulic operation, in top-entry and side-entry configurations for in-line maintenance.
Part of the Triple Offset Butterfly Valves family
Last updated: 2026-11
Specifications
| size range | NPS 2" to 160" (DN50 to DN4000) |
|---|---|
| pressure class | ASME CLASS 150 to 2500 (PN16 to PN420) |
| body materials | Carbon Steel (A216 WCB), Stainless Steel (CF8, CF8M), Alloy Steel, Duplex Stainless Steel |
| end connections | Wafer, Lug, Double Flanged (RF), Butt-Weld (BW) |
| operation | Gear Operator, Pneumatic, Electric, Hydraulic Actuation |
| temperature range | -196°C to +650°C |
| design standards | API 609, ASME B16.34 |
| series designation | TC Series |
| seat and seal | Metal-to-Metal Sealing, Laminated Seal Ring (Graphite/UNS31803) |
| fire safe | API 607 Certified |
| stem design | Anti-blowout stem design per API 609 and ASME B31.1 |
| yoke mounting | ISO 5211 |
| special features | Bi-Directional, Zero Leakage, In-Line Maintainable, Anti-Static Device |
Application & selection guidance
Select the TC Series where duty outgrows double-offset PTFE seating — high temperature, fire-safe requirements, zero-leakage bidirectional shut-off or cryogenic service down to -196°C. Match the end connection to the piping standard (wafer and lug for space-critical installation, double-flanged RF or butt-weld for permanent plant pipework), the body forging to line temperature and medium, and pick the top-entry configuration where in-line seal maintenance matters.
Frequently asked questions
What makes the TC Series sealing system zero-leakage?
The triple-offset geometry eliminates disc-seat friction entirely across the travel, and the seat is a metal-to-metal laminated seal ring in graphite over UNS31803 with hard-faced cobalt-chromium hardfacing alloy seating faces — so tight shut-off does not depend on a soft seat that temperature or fire would destroy.
What temperature and pressure envelope does the series cover?
NPS 2 to 160 (DN50 to DN4000) at ASME Class 150 to 2500 (PN16 to PN420), with a service temperature range of -196°C to +650°C — from LNG cryogenic service to high-temperature steam and flue gas.
Is the TC Series fire-safe and bidirectional?
Yes on both counts: the series carries API 607 fire-safe certification, and the valve is bidirectional with zero leakage, an anti-blowout stem per API 609 and ASME B31.1, an anti-static device, and optional low-emission packing controlling fugitive emissions below 20 ppm.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry — typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage — seat compounds age fastest in direct sunlight and freezing conditions.
Knowledge: selection guides
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