API 6D Electric Soft-Seated PTFE/Fluorine Lined Butterfly Valve for Oil & Gas and Chemical Corrosion Resistance

Specification

TIANYU API 6D Certified Electric Soft-Seated PTFE/Fluorine Lined Butterfly Valve for Oil & Gas and Chemical Corrosion Resistance Applications

In demanding sectors such as oil & gas production, refining, chemical processing, and aggressive media handling, transporting highly corrosive fluids is a fundamental operational challenge. Media like hydrochloric acid, sulfuric acid, mixed organic acids, chlor-alkalis, and solvents pose severe threats to conventional metal valves. Addressing this critical need, TIANYU delivers electric soft-seated PTFE-lined butterfly valves engineered to API 6D standards, providing a robust, long-lasting corrosion barrier.

Application	oil and gas,oil and gas industry,petrochemical, chemical processing, pharmaceuticals, food and beverage, water treatment, and more.
Port Size	DN40~3000mm
Warranty	24 months
Place of Origin	Wenzhou, China
Power	Electric
Temperature of Media	Normal Temperature,high temperature,low temperature
Brand Name	TianYu
Structure	Butterfly
Media	oil and gas,steam,water.chemical etc.
Customized support	OEM, ODM, OBM
Body material	Forged carbon steel, forged CF8/CF8m stainless steel
Ball Material	Forged carbon steel, forged CF8/CF8m stainless steel
Stem Material	forged Stainless steel,etc.
Seat Material	PTFE or metal seal with stellite, tungsten carbide
End Connection	Flange, welded, Socket weld and threaded
Design Standard	API 6D, API 608, API 607, ASME B16.34, ASME B16.25
Certifications	API 6D, API 607, API 598, ANSI/ASME B16.34, CE,JIS,DIN,BS

Core Product Features: Engineered for Corrosion

PTFE Full-Lining Corrosion Barrier:
Unlike partially lined or coated valves, TIANYU employs integral moulding technology to achieve full coverage of the valve body bore and disc (vane) surfaces with high-quality Polytetrafluoroethylene (PTFE).
- Superior Corrosion Resistance: Resists virtually all strong acids, alkalis, organic solvents, and mixed corrosive media (excluding molten alkali metals, elemental fluorine, and certain halides).
- Exceptional Sealing: The inherent elasticity and low friction coefficient of PTFE ensure near-zero leakage soft sealing between disc and seat.
- Media Purity Assurance: Smooth, non-stick surface prevents media buildup and scaling, ideal for hygienic applications (food, pharma).
- Broad Temperature Range: Suitable for media temperatures typically from -20°C to +180°C (grade dependent), covering most industrial scenarios.
Optimized Double-Offset (Double Eccentric) Design:
Utilizes proven double-offset (double eccentric) geometry:
- First Offset: Stem axis offset from the disc sealing surface centerline.
- Second Offset: Stem axis offset from the pipe/valve body centerline.
- Key Benefit: Eliminates friction during opening/closing cycles, significantly extending seal life and reducing operating torque – ideal for frequent cycling.
API 6D Certification:
Products strictly comply with and are certified to API 6D (Pipeline Valves). This signifies:
- Design & Manufacturing Conformity: Adherence to the highest oil & gas industry standards for materials, design, fabrication, testing, and documentation.
- Reliability & Safety Assurance: Qualification for critical, high-pressure, safety-sensitive oil & gas transmission and refining applications.
- Global Market Acceptance: Recognition by international oil majors and large-scale projects.
High-Reliability Electric Actuation:
Integrated high-performance electric actuators enable:
- Remote/Automated Control: Seamless integration into DCS/SCADA systems.
- Precise & Rapid Response: Accurate flow modulation and quick open/close operation.
- Harsh Environment Suitability: Standard IP67/IP68 protection; explosion-proof options (Ex d IIC T6 Gb) available for hazardous areas.
Extensive Size Range (DN40 – DN3000):
Coverage from small bore (DN40) to very large bore (DN3000) pipelines across diverse applications.

Product Overview

Key Technical Specifications & Attributes

Body Material: Forged Carbon Steel (A105) or Forged Stainless Steel (CF8/CF8M) for structural integrity.
Stem Material: High-Strength Forged Stainless Steel (e.g., 17-4PH, F6a), precision ground for corrosion resistance, torsional strength, and wear resistance.
Sealing Core: PTFE Full Lining forms the primary soft sealing system (Note: Metal hard-seated versions available for high-temperature applications).
End Connections: Flanged (RF/RTJ), Butt Weld (BW), Socket Weld (SW), Threaded (NPT/BSPT) compliant with global standards.
Design & Testing Standards:
- Design: API 6D, API 608 (reference for metal seats), ASME B16.34 (Pressure-Temperature Ratings).
- Fire Safe Testing: API 607 / API 6FA (Fire Test for Soft-Seated Valves).
- Inspection & Testing: API 598, API 6D Annex F.
Certifications: API 6D, API 607, CE (PED), ISO 9001. Compliant with ANSI/ASME, JIS, DIN, BS.
Suitable Media: Aggressive chemicals (acids, alkalis, solvents), oil & gas (including corrosive contaminants), steam, water (seawater, wastewater), food-grade media.
Target Industries: Oil & Gas (Upstream, Midstream, Downstream), Petrochemicals, Chemicals, Pharmaceuticals, Food & Beverage, Water/Wastewater Treatment, Power, Metallurgy.

Precision Manufacturing: Foundation of Reliability

Precision Casting/Forging & Machining: Valve body and disc substrates are precision cast or forged for dense microstructure and strength. Multi-axis CNC machining ensures dimensional tolerances within API/ASME limits.
Core PTFE Lining Process:
- Surface Preparation: Metal substrate undergoes grit blasting (Sa 2.5), cleaning, degreasing, and specialized etching (e.g., sodium-naphthalene treatment) for maximum PTFE adhesion.
- PTFE Moulding: Precisely measured PTFE powder uniformly fills the mould cavity around the metal part.
- High-Temperature/Pressure Sintering: Controlled sintering melts, flows, and bonds the PTFE to the metal, forming a dense, uniform, pore-free lining – critical for corrosion resistance and longevity.
- Finishing: Precision turning/grinding of lined sealing surfaces ensures geometry and finish for optimal sealing.
Rigorous Quality Control:
- Material Certification: Traceable MTC/MTR for all raw materials (metals, PTFE, welding consumables).
- Non-Destructive Testing (NDT): 100% RT or UT on critical pressure welds; MT or PT on valve bodies.
- Pressure Testing: 100% Shell Test (≥ 1.5x rating), High-Pressure Seat Test (≥ 1.1x rating), and Low-Pressure Seat Test per API 598/API 6D.
- Dimensional & Functional Checks: Full dimensional inspection, torque testing, position verification.

Valve Details

Key Product Advantages: Delivering Value

Unparalleled Corrosion Resistance: Industry-leading PTFE lining maximizes valve life in harsh media, reducing maintenance and replacement costs.
Exceptional Sealing & Low Leakage: PTFE soft seal with precision double-offset design achieves bidirectional bubble-tight sealing (typically ISO 5208 Rate A or better), meeting stringent environmental/safety standards.
Extended Service Life & Low Maintenance: Frictionless operation and PTFE stability minimize lifecycle costs (LCC).
Smooth, Reliable Operation: Low torque design and reliable electric actuation enhance automation system uptime.
API 6D Compliance & Safety: API 6D certification provides supreme assurance for critical service involving high pressure, flammables, and toxins.
Broad Size Range & Configurable: Full DN40-DN3000 coverage with multiple end connections, material options, and actuators meets diverse project needs.
Global Standards Compliance: Conformance to API, ASME, CE, JIS, DIN, BS facilitates worldwide procurement and project compliance.

Application

Typical Applications: Critical Corrosion Control Points

Oil & Gas: Offshore/onshore chemical injection (inhibitors, methanol, glycol), sour gas/oil processing (H2S, CO2), corrosive pipeline sections, refinery acid/alkali washing, sulfur recovery units (acid gas, solvents).
Chemical Processing: Storage, transfer, metering, reactor feed/discharge, and process line control for acids (sulfuric, hydrochloric, nitric, phosphoric, hydrofluoric), alkalis (caustic, ammonia), solvents (chlorinated, ketones, alcohols); effluent treatment.
Pharma & Food: CIP/SIP systems, purified water/WFI, solvent/acid/alkali transfer, fermenters, hygienic pipelines (PTFE ensures purity).
Water Treatment: Seawater desalination pre-treatment/chemical dosing, wastewater treatment chemical feed (hypochlorite, acids, alkalis), industrial effluent lines.
Power & Metallurgy: FGD systems (limestone/gypsum slurry), power plant chemical feed (acid/alkali), metal pickling lines.