Wenzhou Starry Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of metal seated triple offset butterfly valve in China. We are committed to providing high quality customized valves with low price. If you're going to buy bulk durable metal seated triple offset butterfly valve, welcome to get quotation from our factory.
| Size Range | DN50 ~ DN2400 (NPS 2" ~ 96") |
| Pressure Rating | ANSI Class150, Class300, Class600, Class900, Class1500; PN16 ~ PN100 |
| Temperature Range | -196℃ ~ 500℃ (Full-metal hard-seal); suitable for cryogenic up to high-temperature service |
| Connection Type | Wafer, Lug, ANSI B16.5 Flanged, ASME B16.25 Butt-Weld optional |
| Body Material | A216 WCB Carbon Steel, CF8/CF8M Stainless Steel, WC6/WC9 Alloy Steel, LCB Low-temperature Steel, Duplex Steel optional |
| Sealing Type | Precision all-metal triple-offset hard-sealing pair, Stellite hardfaced seat optional, bidirectional zero-leakage shutoff (API 598 Class VI) |
| Operation Type | Worm gear, electric, pneumatic, hydraulic actuation optional |
| Execution Standard | API 609, ASME B16.34, ASME B16.10, ASME B16.5, ASME B16.25, API 598, MSS-SP-25, EN 593, API 607 fire-safe compliant |
| Structural Feature | Metal seated triple offset butterfly valve adopts unique triple-offset spatial geometric construction to eliminate disc-to-seat contact friction across the full stroke. Conical metal-to-metal sealing pair delivers pressure-actuated self-tightening compensation, achieving stable bidirectional zero-leakage performance under fluctuating working pressure. Free from aging and deformation risks of soft sealing materials. Multiple end-connection configurations (wafer, lug, flanged, butt-weld) satisfy diversified pipeline layout requirements. Rigid integral cast body resists thermal deformation, particle erosion and pressure shock, designed for long-term continuous operation under severe industrial service conditions. |
| Suitable Media | Superheated high-temperature steam, thermal oil, flue gas, compressed air, natural gas, crude oil, fine-particle-containing industrial media, cryogenic liquefied gas and weakly corrosive fluids. Widely used in petrochemical process units, power-plant steam systems, metallurgical high-temperature piping, offshore platforms, cryogenic storage-transport projects and critical industrial isolation & throttling pipelines. |
Features
Three-dimensional offset design separates butterfly disc from seat surface from the very start of opening stroke, realizing complete non-contact and friction-free operation over full travel. No abrasive wear upon metal sealing surfaces, overcoming the short-service-life drawback of conventional soft-seal and double-offset butterfly valves. Precisely machined conical sealing interface achieves progressive locking upon closure with uniform stress distribution and outstanding resistance against pressure impact.
All-metal hard-seal assembly with optional Stellite hard-facing treatment for seat face. Rising medium pressure generates self-tightening compensation force to offset thermal distortion and mechanical clearances. Sealing performance meets API 598 Class VI bidirectional bubble-tight shut-off. Maintains reliable tightness under high-temperature, high-pressure and pressure-surge conditions, far superior to ordinary soft-seal butterfly valves.
Diversified material selections cover working conditions from cryogenic-196℃ up to 500℃. Carbon-steel, stainless-steel and alloy-steel bodies adapt to steam, oil-gas, corrosive and cryogenic liquefied media. Robust valve-body construction withstands thermal expansion-contraction deformation, applicable for complex harsh continuous-operation environments.
Four mainstream connection options available: wafer for compact flange-clamped installation; lug for single-side fixation and blind-end isolation; flanged for easy disassembly-maintenance; butt-weld for leak-proof high-integrity permanent piping. One valve platform supports different site-erection and overhaul requirements of global industrial projects.
Full-metal sealing structure satisfies API 607 fire-safe requirements without soft-material failure risk under fire accident scenarios. Anti-blow-out stem plus high-performance graphite packing realizes low fugitive emission, complying with strict environmental-protection specifications for petrochemical and power industries. Modular internal components simplify inspection and part replacement, reducing overall lifecycle cost.
Typical Application Equipment
- Petrochemical high-temperature process pipeline isolation and flow-control systems
- Power-plant high-pressure steam, thermal-oil and circulating-medium pipelines
- Off-shore platform, marine engineering and ship-board fluid-control piping
- Cryogenic liquefied-gas storage and low-temperature transmission pipeline projects
- Metallurgical high-temperature flue gas, industrial gas and particle-bearing-medium pipelines
- Critical industrial piping requiring fire-safe property and bidirectional tight shut-off
Working Principle & Application Notes
Metal seated triple offset butterfly valve utilizes worm-gear / electric / pneumatic / hydraulic actuator to drive 90-degree rotation of butterfly disc. Unique triple-offset geometry guarantees friction-free opening-closing movement. At fully closed position, conical metal sealing pair locks tightly with self-tightening compensation to block medium flow and realize bidirectional zero leakage; at fully-opened position, streamlined disc forms low-resistance straight-through flow-passage. Select proper end-connection form according to actual piping design: lug type supports unilateral pressure-bearing and blind-end isolation; butt-weld type needs professional on-site welding work and is not fit for frequent disassembly. Stellite hard-facing is strongly recommended for erosion-prone particle-containing media; cryogenic working scenarios shall adopt LCB low-temperature steel. Confirm pressure class, body material, end connection and actuation mode before order placement.
Metal Seated Triple Offset Butterfly Valve Standard
|
Manufacturing Standard |
JB/T8527-2015 |
|
Structure the length of the standard GB |
GB12221-2005 |
|
Flange Standard |
GB9113-2010 |
|
Test Standard |
GB/T 13927-2008 |
Main Performance Specifications
|
DN |
DN(mm) |
50~2000 |
50~500 |
|||
|
PN |
PN(MPa) |
0.6 |
1 |
1.6 |
2.5 |
4.0 |
|
Test Pressure |
Strength test |
0.9 |
1.5 |
2.4 |
3.8 |
6.0 |
|
Seal test |
0.66 |
1.1 |
1.8 |
2.8 |
4.4 |
|
|
Gas seal test |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
|
|
Leakaae rate |
<0.1xDNmm/s(in line with GB/T 13927-2008 standard) |
|||||
|
Leakage rate |
Carbon steel,chrome molybdenum steel:-40℃~550℃ |
|||||
|
Applicable medium |
Air,water,steam,gas,oil and acid,alkali,salt with a weal corrosive media,etc. |
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|
Drive type |
Worm wom transmission,electric transmission |
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Main Components Material
|
Part name |
Material |
|
Body |
Carbon steel,stainless steel,chrome molybdenum steel,alloy steel |
|
Disc |
stainless steel,chrome molybdenum steel,Carbon steel,alloy steel |
|
Sealing ring |
Stainless steel and high temperatureasbestos combined inito mulfi-level |
|
Stem |
Cr13 Series Stainless Steel,Austrian Stainless Steel and Alloy Steel |
|
Bearing |
Austenitic stainless steel,304 nitride |
|
Packing |
Flexible graphite |
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