TOV-900 Triple-Offset Severe-Service Butterfly Valve
Industrial Severe-Service Series // API 609 Category B · ASME B16.34 · Zero Seat-Friction Geometry
OFFSET 1 & 2
Dual Eccentric Shaft
SEAT GEOMETRY
Stellite Gr.6 Hardfaced Body Seat
SEALING ELEMENT
Inconel 718 Laminated Ring
Headline ParametersNPS 6" / DN150 Baseline
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Engineered for Extreme Service Regimes
The TOV-900 series eliminates elastomer breakdown, galling, and thermal binding in severe industrial services where conventional gate, globe, or standard ball valves suffer catastrophic failure.
LNG & Cryogenic
Liquefied methane isolation down to -196°C with extended vapor column cold boxes.
Superheated Steam
High-enthalpy steam isolation up to +650°C in combined-cycle power and steam cracker loops.
Refined Hydrocarbons
Naphtha, FCC catalyst slurries, and delayed coking where high solids cause seat abrasion.
HP Acid Leaching
Autoclave discharge lines with sulfuric acid slurries in nickel, cobalt, and gold extraction plants.
Nuclear Auxiliary
Component cooling water and balance-of-plant radioactive waste fluid isolation lines.
GA Schematic & Dimensional Data
Critical Dimensions — Class 300 (PN50)
| Size (DN) | Face 'A' | Center 'H1' | Stem 'H2' | Weight |
|---|---|---|---|---|
| DN80 (3") | 114 mm | 135 mm | 220 mm | 28 kg |
| DN100 (4") | 127 mm | 160 mm | 265 mm | 42 kg |
| DN150 (6") ★ | 140 mm | 205 mm | 345 mm | 86 kg |
| DN200 (8") | 152 mm | 240 mm | 410 mm | 148 kg |
| DN250 (10") | 165 mm | 285 mm | 475 mm | 215 kg |
| DN300 (12") | 178 mm | 330 mm | 540 mm | 310 kg |
★ Current selected configuration: DN150. Flange bolt pattern: 12 holes, 7/8" UNC on 269.9mm PCD.
Frictionless Sealing Dynamics
Four distinct mechanical breakthroughs eliminate common failure modes in extreme thermal cycling and slurry processes.
Triple-Eccentric Geometry
Offset 1 (shaft behind seat) + Offset 2 (shaft offset from centerline) + Offset 3 (conical seal axis) produces a camming action. The disc only engages the body seat in the final degree of closure, ending seal wear.
API 609 Anti-Blowout Stem
Heavy-duty one-piece trunnion-supported stem with an integral hardened shoulder located below the stuffing box. Redundant internal retaining collar prevents stem ejection under full pipeline differential.
Live-Loaded Stem Packing
Belleville spring-energized graphite gland packing maintains continuous compressive force across 600°C thermal swings, certifying compliance with ISO 15848-1 Class AH fugitive emission limits without manual adjustment.
Field-Replaceable Seal Ring
Laminated seal ring is bolted directly onto the disc perimeter with a stainless clamp ring. Onsite replacement does not require body replacement or factory re-lapping, minimizing turnaround downtime.
Technical Specifications Table
| Standard Parameter | Design Basis / Specification | Verification Rule |
|---|---|---|
| Design & Shell Standard | ASME B16.34 / API 609 Cat B / EN 593 | Certified Type Approval |
| Face-to-Face Dimensions | ISO 5752 Series 13 / 14 · ASME B16.10 | Interchangeable with Gate Valves |
| Flange Drilling Standard | ASME B16.5 Class 300 RF (Spiral Serrated 125-250 Ra) | EN 1092-1 PN40 / PN50 Avail |
| Hydrostatic Shell Test (Water) | 76.5 bar (1,110 psig) | 1.5× CWP, API 598 Pass |
| High-Pressure Hydro Seat Test | 55.0 bar (798 psig) | ISO 5208 Rate A (0 Drops) |
| Low-Pressure Pneumatic Air Seat | 6.0 bar (87 psig) Clean Dry Air | 0 bpm Bubble-Tight Shutoff |
| Flow Coefficient (Fully Open 90°) | Cv = 1,180 (Kv = 1,020 m³/h) | NPS 6" CL300 Calibrated Test |
| Max Operating Torque @ ΔP max | 480 N·m (354 lbf·ft) | Includes 1.35 Safety Factor |
| Fugitive Emissions Rating | ISO 15848-1 Class AH, CO3, SSA 0 | He Leak Detector Tested |
| Fire-Safe Certification | API 607 7th Edition / ISO 10497 | Burn Tested 30 min @ 1000°C |
Trim Metallurgy & Material Selection
Select certified alloy pairings engineered for sour service (NACE MR0175), cryogenic liquid oxygen, or abrasive mineral slurry applications.
Body Material
Disc Edge Coating
Laminated Seal
Stem Gland Stack
Datasheets, Approvals & 3D Models
TOV-900 Comprehensive Technical Datasheet
Installation, Operation & Maintenance Manual (IOM-TOV-900)
API 607 7th Edition Fire-Test Certificate (Lloyds Register)
ISO 15848-1 Fugitive Emissions Type Test Certificate (TÜV SÜD)
Parametric 3D Solid Model Assembly (NPS 6" Class 300)
Dimensional GA Blueprint with Actuator Envelope
Spare Parts & Wear Component Overhaul Kits
Factory-matched OEM wear kits guaranteeing identical dimensional tolerance and metallurgy traceability for planned plant turnarounds.
Disc Seal Ring Replacement Kit
Includes pre-formed Inconel 718 + 316SS laminated seal element, annealed copper backing gasket, and high-tensile A4-80 Torx cap screws.
Dynamic Gland Packing Kit
Die-molded flexible graphite rings (5-ring set), braided carbon yarn wiper scraper rings, replacement Belleville disc spring washers (17-7PH).
Upper & Lower Bushing Set
Nitronic 60 gall-resistant radial sleeve bearings with integrated stellite thrust washer plates for high-cycle modulated applications.
Compare Valve Architectures
Evaluate hydraulic, footprint, and weight trade-offs against alternative severe-service valve technologies.
TOV-900 Triple-Offset
Compact severe-service bi-directional shutoff with frictionless metal seats.
BV-300 Trunnion Ball Valve
Full-port pipeline isolation for transmission headers requiring scrapers/pigs.
HPB-300 High Performance
Double eccentric PTFE-seated valve for clean water, utilities, and mild chemicals.
Need Sizing, Cavitation Analysis, or Cryo Extension?
Our Senior Flow Application Engineers can run finite element thermal gradient analysis, Cv control profiling, or calculate dynamic torque loads for your specific fluid composition.