The triple offset metal seated butterfly valve features an advanced triple offset geometry design that completely eliminates friction between the disc and seat during opening and closing, achieving bidirectional zero leakage with metal‑to‑metal sealing.
The triple offset metal seated butterfly valve is a high‑performance industrial valve based on three eccentric principles: axial eccentricity, radial eccentricity, and conical seat eccentricity. This unique geometry ensures that the disc travels through the 0‑90° range with virtually no friction against the seat, completely eliminating sealing face wear common in conventional butterfly valves. The valve employs a torque‑seated metal sealing structure, achieving bidirectional zero‑leakage performance.
Compared with traditional gate and globe valves, the triple offset butterfly valve offers significant advantages, including compact construction, light weight, low operating torque, and easy installation and maintenance, making it highly reliable for severe service conditions involving high temperature, high pressure, and corrosive media.
1. Triple Offset Friction‑Free Design
First offset: Shaft offset from the seat sealing face centerline
Second offset: Shaft offset from the pipeline centerline
Third offset: Conical sealing surface geometric eccentricity
The disc contacts and disengages from the seat instantaneously during operation, enabling friction‑free travel and greatly extending valve service life
2. Bidirectional Zero Leakage Sealing
Metal‑to‑metal hard sealing
Higher pressure results in tighter sealing; achieves bidirectional bubble‑tight zero leakage
Complies with ISO 5208 Class VI leakage rating
3. High Temperature & High Pressure Capability
Temperature range: -196°C to +600°C (depending on materials)
Pressure rating: Class150 to Class1500 / PN10 to PN100
Suitable for high‑temperature steam, thermal oil, hot gas, etc.
4. Fire Safe Design
The metal sealing structure is inherently fire‑safe
Complies with API 607 / ISO 10497 fire test standards
5. Easy Maintenance
Seals can be replaced in‑situ without removing the valve body from the pipeline
Blowout‑proof stem design meeting API 609 safety requirements
| Parameter | Details |
|---|---|
| Model Series | D343H / D373H / D643H / D943H etc. |
| Size Range | DN50 – DN2400 (NPS 2″ – 96″) |
| Pressure Rating | PN10 – PN100 / Class150 – Class1500 |
| Connection Type | Wafer / Lug / Flanged / Butt Weld |
| Operation | Manual gear, electric, pneumatic, hydraulic |
| Temperature Range | -196°C to +600°C |
| Leakage Rating | Bidirectional zero leakage (bubble‑tight) |
| Design Standards | API 609, ASME B16.34, GB/T 12238, JB/T 8527 |
| Component | Available Materials |
|---|---|
| Body | Cast Steel (WCB), Carbon Steel (A105), Stainless Steel (304/316), Chrome‑Moly Steel, Duplex Stainless, Hastelloy, Monel |
| Disc | Cast Steel, Stainless Steel, Duplex Stainless, Titanium, Hastelloy |
| Stem | 410 Stainless Steel, SS304, SS316, 17‑4PH, Monel K500 |
| Seat Sealing Face | Stainless steel with Stellite hardfacing, 13% Cr alloy, Inconel |
| Seal Ring | Multi‑layer stainless steel + graphite laminate / Solid metal seal |
| Packing | Flexible graphite, PTFE |
High‑temperature steam, hot water, thermal oil
Oil, natural gas, coke oven gas
Acids, alkalis, and corrosive chemicals
Flue gas, air, oxygen
Cryogenic media (e.g., LNG)
Petrochemical & Chemical – Refinery units, ethylene cracking, storage and transportation systems
Power Generation – Power plant boilers, turbine bypass lines, thermal piping systems
Metallurgy – Blast furnace gas, converter flue gas, reheating furnaces
District Heating – Long‑distance heating networks, heat exchange stations
Marine & Offshore – FPSO, offshore platforms, LNG carriers
Pulp & Paper – Pulping, alkali recovery systems
Food & Pharmaceutical – High‑temperature sterilization, clean steam
Manual Gear – Standard, self‑locking, low operating torque
Electric Actuator – Enables remote control and automation
Pneumatic Actuator – Fast operation for on‑off or modulating service
Hydraulic Actuator – Suitable for high‑torque requirements
This product can be customized according to specific service conditions:
High‑temperature service – Chrome‑Moly steel body + Stellite hardfaced sealing surfaces
Highly corrosive service – Stainless steel / Duplex / Hastelloy materials
Cryogenic service – Low‑temperature carbon steel / stainless steel with anti‑fugitive design
High‑abrasion service – Hardfaced sealing surfaces
For special requirements, please contact us for professional selection assistance.
