OEM Double Flanged Triple Offset Butterfly Valve Manufacturers & Exporters

Tianjin Zhongfa Valve Co., Ltd. (ZFA) engineers zero-leakage, bi-directional, API 609 compliant metal-seated isolation for cryogenic, high-temperature, and mission-critical petrochemical infrastructures worldwide.

Industrial Core Range

Precision Flow Control: Primary Production Line

Explore heavy-duty OEM butterfly, gate, and dual-plate check valve configurations machined to strict ANSI, ISO, and DIN dimensional standards.

Kinematic Engineering

Triple Eccentric Geometry: Eliminating Friction & Wear

A comprehensive examination of how three distinct angular and spatial offsets deliver true frictionless closure, bi-directional bubble-tight sealing, and prolonged mechanical longevity.

Offset 1: Shaft Axis Shift

The stem axis is positioned behind the plane of the sealing surface. This spatial shift provides an uninterrupted 360-degree continuous sealing boundary across the perimeter of the disc.

Offset 2: Centerline Eccentricity

The shaft centerline is offset laterally from the pipeline centerline. This enables the disc to break away instantaneously from the body seat upon the initial degrees of opening stroke.

Offset 3: Conical Cam Angle

The sealing cone apex is angled away from the valve bore center. The disc acts like a cam, achieving pure mechanical wedging without scrubbing or rubbing during seat contact.

ISO 5208
Rate A Zero Leakage
-196°C ~ +600°C
Operating Envelope
API 607
Fire Safe Certified
DN50 ~ DN2400
Available Bore Range
Technical Specification Matrix

Double Flanged Triple Offset Valve Architectural Specifications

Engineered to replace traditional cumbersome gate and ball valves while slashing operational torque and piping weight.

Design Parameter Standard Specification Severe Service Options Compliance / Validation
Nominal Diameters 2" to 80" (DN50 – DN2000) Up to 96" (DN2400) Custom Castings ASME B16.47 / EN 558
Pressure Ratings Class 150, Class 300 (PN10 – PN40) Class 600, Class 900 (PN63 – PN150) ASME B16.34
Body Materials WCB, LCC, CF8 (304), CF8M (316) Duplex 2205, Super Duplex 2507, Monel, Inconel 625 ASTM A216 / A351
Disc Seal Ring Laminated SS316 + Flexible Graphite Solid Stellite Gr.6 / Solid Monel / Solid CF8M Fire-Safe API 607 7th Ed
Body Seat Ring Surfaced Stellite Gr.21 / 316 Hard-Faced Laser Clad Inconel 625 / Tungsten Carbide NACE MR0175 / ISO 15156
Fugitive Emissions PTFE V-Ring / Die-formed Graphite Ring Live-Loaded Belleville Spring Packing Stack ISO 15848-1 Class AH
Manufacturing Infrastructure

China Factory Cluster & Vertical Supply Chain Dominance

How ZFA Valve leverages Tianjin's premier industrial ecosystem to provide cost efficiency, metallurgical precision, and certified quality.

Controlled In-House Foundry

By operating tied investment and resin-sand foundries, ZFA maintains strict optical emission spectrometry control over raw melts, preventing porosity and metallurgical inclusions.

5-Axis CNC Precision Boring

The intricate geometry of the third offset conical angle demands extreme tolerances. Our climate-controlled multi-axis machining centers ensure seat runout remains within ±0.005mm.

Port-Adjacent Logistics Hub

Strategically situated in Tianjin, northern China's primary maritime trade gateway, ZFA reduces container inland haulage lead times and delivers smooth ocean freight access globally.

Global Quality Assurance

Compliance, Localized Support & Mission-Critical Sectors

Engineered to satisfy demanding international procurement mandates, including complete MTR documentation, NDT non-destructive testing, and regional EPC execution.

District Energy & High-Pressure Steam

Replaces high-maintenance gate valves in superheated steam distribution (up to 450°C). Minimizes energy loss while handling frequent thermal cycles without seat binding.

Refining & Hydrocarbon Processing

Complies with API 607 fire-test certifications and NACE MR0175 sour service specifications. Prevents fugitive emissions in aromatic solvents, hydrogen service, and flare gas loops.

Full EN 10204 3.1 Traceability

Every valve exported is backed by traceable EN 10204 3.1 material test certs, full chemical composition reports, Charpy impact test logs, and PMI spectrographic validation.

Engineering Help Desk

Frequently Asked Questions: Triple Offset Butterfly Valves

Essential design, installation, and procurement insights for piping engineers and supply chain professionals.

Why specify Double Flanged Triple Offset over Wafer or Lug patterns? +
Double flanged valves feature independent bolting on both pipe ends, providing substantial mechanical rigidity. This prevents line stresses from distorting the internal seating diameter, facilitates safe dead-end pipeline maintenance without downstream pressure containment loss, and provides superior sealing alignment in high-pressure and large-bore applications (DN600+).
How does the valve deliver true zero leakage (API 598 / ISO 5208 Rate A)? +
Unlike concentric or double-offset designs that depend on elastic interference friction, the triple-offset geometry relies on torque-seating. The disc cone wedges tightly into the matching conical body seat with no sliding contact until the final fraction of a degree. This mechanical wedge action compresses the multi-layered laminated stainless steel and graphite seal ring evenly, creating complete bi-directional bubble-tight shutoff.
Can ZFA supply custom face-to-face dimensions and actuator mounting? +
Yes. ZFA offers direct OEM customization matching standard ISO 5752 series, API 609 table dimensions, or gate valve replacement lengths (such as ASME B16.10 short/long patterns). Actuator mounting pads are precision-machined strictly to ISO 5211 to interface with quarter-turn pneumatic scotch yoke, multi-turn electric, and hydraulic actuators without modifications.
What are the maintenance requirements for metal-seated triple offset valves? +
Because the sealing components disengage immediately during rotation without friction, seal ring wear is reduced significantly compared to standard valves. Under standard operational parameters, triple-offset valves offer long maintenance-free lifespans. Should process media cause damage, the bolted disc seal ring and body seat are field-replaceable without replacing the valve body or purchasing specialized tools.
Comprehensive Lineup

High Performance & Resilient Isolation Portfolio

Reliable flow-control solutions ranging from mono-flange large diameter butterfly valves to bolted-bonnet soft sealing gate units.

Partner with an Engineering-Driven OEM Valve Foundry

Submit your piping schedules, medium properties, and torque specifications for rapid factory-direct technical quotations.

Request Factory Quotation Download Engineering Catalogs