Specification

Newway 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, Newway delivers electric soft-seated PTFE-lined butterfly valves engineered to API 6D standards, providing a robust, long-lasting corrosion barrier.

Core Product Features: Engineered for Corrosion

PTFE Full-Lining Corrosion Barrier:
Unlike partially lined or coated valves, Newway 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.