PTFE Lined Flanged Centerline Butterfly Valve

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Description

Specifications

The PTFE Lined Flanged Centerline Butterfly Valve is designed for handling highly corrosive media in chemical processing, water treatment, pharmaceutical, and industrial applications. Featuring a full PTFE-lined body and disc, this valve provides outstanding corrosion resistance, bubble-tight sealing, and long service life under demanding operating conditions.

Size Range	DN50–DN1200 (2″–48″)
Pressure Rating	PN10, PN16, PN25, ANSI Class 150
Temperature Range	-20°C to +180°C
Connection Type	Flanged Ends
Flow Direction	Bi-directional
Leakage Class	Bubble-Tight Shutoff (Zero Leakage)
Operation Options	Lever, Worm Gear, Pneumatic Actuator, Electric Actuator
Installation	Horizontal or Vertical Pipeline
Applicable Media	Acids, Alkalis, Corrosive Chemicals, Chlorine, Seawater, Ultra-Pure Water, Chemical Process Fluids
Design Standard	API 609, EN 593, MSS SP-67
Face-to-Face Standard	ISO 5752, EN 558 Series 20
Flange Standard	ANSI B16.5 Class 150, DIN PN10/PN16, JIS 10K
Inspection & Testing	API 598, ISO 5208, EN 12266-1

Materials of Construction

Body	Ductile Iron, Carbon Steel (WCB), Stainless Steel CF8/CF8M
Disc	PTFE Lined Ductile Iron, PTFE Lined Stainless Steel
Seat / Liner	Virgin PTFE, PFA (Optional)
Stem	SS410, SS420, SS304, SS316
Bearing	PTFE, Bronze
Seal Material	PTFE, FKM, EPDM
Fasteners	Stainless Steel 304 / 316

Key Features of PTFE Lined Butterfly Valve

Full PTFE lining provides exceptional resistance to acids, alkalis, solvents, and aggressive chemicals.
Bubble-tight sealing performance ensures reliable shutoff and minimizes leakage risks.
Low operating torque design enables smooth operation and extended service life.
Suitable for corrosive fluid handling systems across various industries.
Available with manual, pneumatic, and electric actuation options.
Complies with international standards including API 609 and API 598.

Typical Applications

Chemical Processing Plants
Acid and Alkali Transfer Systems
Water and Wastewater Treatment Facilities
Chlor-Alkali Industry
Pharmaceutical Manufacturing
Pulp and Paper Industry
Power Generation Plants
Marine and Offshore Applications

FAQ:

What is a PTFE lined butterfly valve?

A PTFE lined butterfly valve is a corrosion-resistant valve designed for handling aggressive chemicals, acids, alkalis, and other corrosive media. The wetted parts are lined with PTFE (Polytetrafluoroethylene), providing excellent chemical resistance and preventing direct contact between the process media and the metal body.

What are the advantages of PTFE lined butterfly valves?

PTFE lined butterfly valves offer superior corrosion resistance, bubble-tight sealing performance, low operating torque, lightweight construction, and long service life. They are widely used in chemical processing, water treatment, pharmaceutical, and industrial applications where corrosion protection is critical.

What media can PTFE lined butterfly valves handle?

These valves are suitable for sulfuric acid, hydrochloric acid, nitric acid, sodium hydroxide, chlorine solutions, seawater, ultra-pure water, and various corrosive chemicals. Media compatibility should always be verified according to operating temperature and concentration.

What is the temperature range of a PTFE lined butterfly valve?

The typical operating temperature range is from -20°C to +180°C. Actual temperature limits may vary depending on the valve design, pressure rating, and lining material specification.

Can PTFE lined butterfly valves be used for sulfuric acid service?

Yes. PTFE lining provides excellent resistance to sulfuric acid and many other strong acids. However, the exact concentration, operating temperature, and process conditions should be reviewed before valve selection.

What pressure ratings are available?

PTFE lined flanged butterfly valves are commonly available in PN10, PN16, PN25, and ANSI Class 150 pressure ratings. Higher pressure designs may be available upon request.

What is the difference between PTFE and PFA lined butterfly valves?

PTFE offers excellent chemical resistance and is widely used in corrosive applications. PFA provides similar chemical resistance but offers improved flexibility, higher purity, and better performance in certain high-temperature applications.

Can PTFE lined butterfly valves be automated?

Yes. PTFE lined butterfly valves can be supplied with pneumatic actuators, electric actuators, limit switch boxes, positioners, and other automation accessories to meet process control requirements.

Which industries commonly use PTFE lined butterfly valves?

These valves are widely used in chemical plants, pharmaceutical facilities, water treatment systems, chlor-alkali plants, pulp and paper mills, mining operations, and marine applications where corrosion resistance is required.

How do I choose the right PTFE lined butterfly valve?

When selecting a PTFE lined butterfly valve, consider media type, chemical concentration, operating temperature, pressure rating, connection standard, valve size, and automation requirements. Consulting with an experienced valve manufacturer can help ensure optimal valve performance and service life.