API609 ASME Large Bore Flanged PTFE Lined Butterfly Valve

Product Overview

The API609 ASME Large Bore Flanged PTFE Lined Butterfly Valve is a professional large-diameter anti-corrosion industrial shutoff and regulating valve manufactured in strict accordance with American API609 and ASME industrial standards. The valve adopts integral heavy-duty double-flange structure, fully compliant with ASME B16.5 and ASME B16.47 large-diameter flange specifications, specially designed for super-large bore industrial pipeline engineering. The entire valve cavity, valve plate and sealing parts are lined with high-purity PTFE/FEP fluorine material, completely isolating acid-base corrosive media from the metal valve body, solving the corrosion and scaling problems of ordinary metal butterfly valves in harsh chemical working conditions.

All structural dimensions, pressure grades and factory test procedures strictly follow API609 and API598 standards, supporting stable operation of ultra-large diameter pipelines from NPS12 to NPS64. This large-bore fluorine-lined butterfly valve features bidirectional zero leakage sealing, low operating torque and strong chemical stability. It can resist erosion of various strong acid, strong alkali and organic solvent media, and is widely used in large-scale chemical, pharmaceutical, environmental protection desulfurization and corrosive medium long-distance transmission pipeline projects, being the core anti-corrosion control equipment for large-diameter industrial pipeline systems.

Core Product Features

1. Full API609 & ASME Standard Compliance
Designed and inspected strictly per API609 Category B butterfly valve specifications, matching ASME B16.5 conventional flange and ASME B16.47 large-diameter flange dimensional standards. The face-to-face length and pressure temperature rating fully comply with ASME B16.10 and ASME B16.34, and all finished products pass API598 hydrostatic and air tightness tests, fully meeting international large-scale chemical engineering acceptance requirements.

2. Full PTFE Fluorine Lined Anti-Corrosion Structure
The valve body, disc and inner wall are all lined with high-density pure PTFE/FEP fluorine material, with uniform lining thickness and strong bonding force, no peeling or cracking. It resists almost all strong acid, strong alkali, salt water and organic solvent corrosion, completely solving the rust and medium erosion failure problems of ordinary cast steel and stainless steel valves.

3. Professional Large Bore Flanged Design
Optimized for super-large diameter pipeline working conditions, covering standard large sizes NPS12–NPS64 and customized oversized bore. Adopts ASME standard heavy-duty double-flange connection with thickened valve body wall, which can withstand long-term high-flow medium impact and pipeline pressure fluctuation, ensuring structural stability of large-caliber pipeline systems.

4. Bidirectional Zero Leakage Sealing Performance
Adopts integrated fluorine rubber soft sealing pair, with excellent compression resilience and fitting performance. It realizes ANSI Class VI bubble-tight zero leakage bidirectional shutoff, effectively preventing corrosive medium leakage and pipeline safety hazards. The fluorine-lined sealing surface has smooth friction and low wear, maintaining long-term stable sealing effect.

5. Excellent High & Low Temperature Resistance
The high-quality PTFE lining material features stable physical and chemical properties, adapting to long-term operation in the temperature range of -20℃ to 180℃. It will not deform, age or fail in low-temperature cold environment and high-temperature chemical medium working conditions, with ultra-long service life.

6. Low Torque & Stable Operation
The inner fluorine-lined surface is smooth and flat, effectively reducing medium flow resistance and friction torque during valve switching. It supports manual, worm gear, pneumatic and electric multi-driving modes, realizing flexible and labor-free opening and closing of large-diameter valves, avoiding jamming failure.

7. Anti-Scaling & Easy Maintenance
The dense and smooth fluorine-lined inner wall is not easy to adsorb dirt and chemical crystallization, with excellent anti-scaling performance. It reduces pipeline blockage probability and daily cleaning frequency, greatly lowering later operation and maintenance costs of large-diameter pipeline systems.

Technical Specifications

Installation, Operation & Maintenance Notes

1. Standard Operation Guidelines
This API609 large-bore fluorine-lined butterfly valve is suitable for full open/closed isolation and stable flow regulation of corrosive medium pipelines. Long-term ultra-small opening throttling is prohibited to prevent high-speed corrosive medium scouring on the fluorine-lined surface. Strictly operate within rated pressure and temperature range to avoid lining aging and peeling failure.

2. ASME Large Flange Installation Requirements
Install the valve on the straight pipe section of large-diameter pipelines, keep away from pump outlets and elbow turbulent areas. Align the valve ASME standard large flange with the pipeline flange accurately, install anti-corrosion gaskets, and tighten bolts diagonally and evenly to ensure uniform stress. Hard welding slag and sharp impurities must be completely cleaned before installation to prevent scratching the fluorine-lined anti-corrosion layer.

3. Fluorine Lining Protection Maintenance
Prohibit violent impact, extrusion and forced switching during operation to avoid cracking and peeling of the fluorine lining layer. Regularly observe the inner lining condition, check for aging, blistering or damage. Do not use high-hardness tools to clean the valve cavity to protect the anti-corrosion lining integrity.

4. Daily Inspection & Maintenance
Regularly check flange connection tightness to prevent corrosive medium leakage. Inspect the sealing surface wear regularly, replace aging sealing accessories in time after full pipeline depressurization and medium drainage. Ensure flexible valve switching and zero leakage operation of large-diameter corrosive pipelines.

Wide Application Scenarios

• Chemical Industry: Large-diameter acid-base chemical medium transmission pipelines, chemical reaction and corrosive fluid control systems

• Environmental Protection & Desulfurization: Power plant flue gas desulfurization and denitrification large-bore slurry pipelines, corrosive sewage treatment systems

• Pharmaceutical & Fine Chemical: Pharmaceutical waste liquid, chemical solvent and high-purity corrosive medium pipeline isolation valves

• Metallurgy & Electroplating: Industrial acid washing liquid, electroplating wastewater and corrosive process medium large-diameter pipeline equipment

• New Energy Chemical Projects: Lithium battery chemical liquid, industrial salt water and special corrosive medium pipeline control systems

Product Competitive Advantages

✅ Genuine API609 & ASME Standard — Fully compliant with American industrial standards, compatible with global ASME large-bore flange pipeline systems.

✅ Full Fluorine Lined Anti-Corrosion — High-purity PTFE lining, full isolation of corrosive media, universal anti-corrosion for all acid and alkali working conditions.

✅ Professional Large Bore Adaptation — Optimized super-large diameter structure, thickened heavy-duty valve body, stable for high-flow large-caliber pipeline operation.

✅ ANSI VI Zero Leakage Sealing — High-elastic fluorine sealing pair, bidirectional tight shutoff, no corrosive medium leakage risk.

✅ High Temperature & Aging Resistance — Stable fluorine lining performance, anti-aging and anti-scaling, long service life in harsh chemical environments.

✅Multi-Scenario Versatility — Supporting multiple driving modes, fully meeting automatic and manual control demands of large-scale chemical engineering projects.

Order & Certification Information

MOQ: 1 Unit
Production Lead Time: 15–25 working days for standard large bore specifications, 30–40 working days for customized oversized valves
Supporting Documents: EN10204 3.1 Material Certificate, API609 Test Report, API598 Inspection Report, ISO9001 Quality Certificate
Export Packaging: Internal anti-rust & lining protection + Plastic wrap + Reinforced fumigation-free wooden case for large valves
Warranty Service: 12-month quality warranty + lifelong professional after-sales technical support

Contact Us for customized super-large bore sizes, special pressure grades and bulk preferential prices of API609 ASME Large Bore Flanged PTFE Lined Butterfly Valves.

What Is an API Pneumatic Flanged Butterfly Valve

An API Pneumatic Flanged Butterfly Valve is an automated quarter turn valve designed to control or isolate the flow of liquids, gases, and other process media. It uses a rotating disc mounted on a shaft, while a pneumatic actuator provides opening and closing force through compressed air. Flanged ends ensure secure pipeline connections and easy installation. Designed in accordance with API requirements, the valve is widely used in oil and gas, chemical processing, water treatment, and power generation systems.

Why the API Pneumatic Flanged Butterfly Valve Matters

This valve is important because it provides fast and reliable flow control while supporting remote operation and process automation. Pneumatic actuation offers safe and efficient performance in environments where electrical equipment may not be preferred. API compliant construction ensures dependable sealing and structural integrity. The compact design and low operating torque help improve system efficiency and maintain stable operating conditions in demanding industrial applications.

Common Product Types by API Pneumatic Flanged Butterfly Valve

Common product types include concentric butterfly valves, double offset butterfly valves, and triple offset butterfly valves. Soft seated versions are suitable for general purpose service, while metal seated designs are preferred for high temperature and abrasive media. Pneumatic actuators are available in double acting and spring return configurations. Optional accessories such as positioners, solenoid valves, limit switches, and air filter regulators provide enhanced control and monitoring functions.

Key Advantages of API Pneumatic Flanged Butterfly Valve

The valve offers rapid operation, reliable sealing, and reduced operating torque. Pneumatic actuation enables automatic control and easy integration with industrial process systems. The lightweight and compact structure simplifies installation and maintenance. Flanged connections provide strong and stable sealing performance. With appropriate seat and body materials, the valve can operate effectively in corrosive, high temperature, and high pressure environments while maintaining long service life.

API Pneumatic Flanged Butterfly Valve Machine Structure and Core Stations

Manufacturing begins with casting or forging the body, disc, and shaft components using suitable materials. Core stations include heat treatment, CNC machining of flange faces, shaft holes, disc surfaces, and sealing areas. Assembly stations install the shaft, seat, bearings, seals, and pneumatic actuator with related accessories. Final operations include actuator calibration, pressure testing, surface treatment, marking, cleaning, and packaging to ensure accurate operation and dependable sealing performance.