Language

Back

English

Home > Products > All Collections > PTFE Lined Butterfly Valve

PTFE Lined Butterfly Valve Manufacturer

Laux Valve is a reliable Chinese manufacturer of PTFE lined butterfly valves, delivering durable flow control solutions for corrosive media and harsh industrial conditions.

Full PTFE lining separates corrosive chemicals from valve bodies, delivering superior anti-corrosion performance, tight sealing and long service life. Offered in wafer and lug styles with customizable bodies, discs and actuators, our valves suit chemical, pharmaceutical, water treatment, mining, pulp paper and semiconductor industries, featuring low torque and easy quarter-turn operation.

All valves are produced under ISO 9001 standards and pass strict pressure leakage tests. We support full OEM custom service to meet global standard and project demands.

PTFE Lined Butterfly Valve

Laux Valve manufactures two complete series of PTFE lined butterfly valves: Wafer and Lug PTFE Lined Butterfly Valve, both sized DN50–DN600 (2"–24"). Compliant with EN593, API609 and MSS SP-67 standards, they support PN10/PN16 & Class150 pressure ratings up to 16 Bar for small bore sizes.

The split-body full PTFE/PFA lining delivers outstanding resistance to strong corrosive chemicals. Wafer type features compact sandwiched installation, while lug type supports single-side blind-end mounting. All components follow ASTM standards with ductile iron, stainless steel and bronze material options. Ideal for chemical, electroplating and pharmaceutical pipelines, with full OEM & ODM customization offered to global buyers.

One-Piece Body Full PTFE Lined Butterfly Valve with Vulcanized PTFE Seat

Electric Actuator Lug Type Split Body Full PTFE Lining Butterfly Valve

Split Body Double Flange Butterfly Valve — PTFE Lined Body, Polished Stainless Steel Disc

DN100 wafer type PTFE Lining Butterfly Valve 4" Butterfly Valve

Wafer Lug U-Type Split Body PTFE PFA Lining Butterfly Valve

PTFE Lined Butterfly Valve

What is a PTFE Lined Butterfly Valve?

A PTFE Lined Butterfly Valveis a corrosion-resistant quarter-turn valve specifically engineered for handling aggressive chemicals, corrosive liquids, and high-purity process media. Unlike conventional resilient seated butterfly valves, the internal wetted surfaces of the valve body are completely isolated from the process medium by a continuous PTFE lining, providing exceptional resistance against acids, alkalis, salts, solvents, and other highly corrosive fluids.

The valve operates through a 90-degree rotating disc that quickly starts, regulates, or completely stops the flow. The PTFE liner not only serves as the primary sealing element but also protects the valve body from chemical attack, significantly extending service life in demanding industrial environments.

Laux PTFE Lined Butterfly Valves are available in wafer and lug configurations and are designed for installation between standard pipeline flanges. Precision-machined components, low operating torque, and bidirectional bubble-tight sealing make these valves suitable for both manual operation and automated systems using pneumatic or electric actuators.

Compared with metal seated or rubber seated butterfly valves, PTFE lined valves provide outstanding chemical compatibility while maintaining compact dimensions, lightweight construction, and low maintenance requirements. They are widely used in chemical processing plants, pharmaceutical production, chlor-alkali industries, semiconductor manufacturing, water treatment facilities, and other applications requiring long-term corrosion protection.

To meet different process requirements, Laux Valve offers multiple body materials, stainless steel shafts, PTFE encapsulated discs, and various automation options, providing customers with reliable flow control solutions for highly corrosive service conditions.

Product Features

High performance PTFE lined butterfly valve for chemical processing

Split Two-Piece Body

The valve body features a two-piece tyle construction , engineered to provide excellent structural strength while maintaining a compact and light weight design.

All ductile iron bodies are protected with a high-performance fusion bonded epoxy coating , offering outstanding resistance to corrosion, moisture, and harsh industrial environments.

Designed to meet the hydrostatic pressure requirements of ASME Class 150 and DIN pressure standards , the body ensures reliable performance under demanding operating conditions. The compact wafer design also simplifies installation between standard pipeline flanges while reducing overall system weight and installation costs.

Lining PTFE Disc

The disc features a minimum 3 mm (1/8") layer of pure virgin PTFE fully encapsulated over a stainless steel core, providing outstanding resistance to acids, alkalis, solvents, and other corrosive chemicals. This design completely isolates the metal from the process media, ensuring long service life, reliable sealing, and low maintenance in chemical processing, water treatment, and pharmaceutical applications.

PTFE lined butterfly valve sealing structure

Optimized PTFE Seat Design

The precision-engineered PTFE seat reduces operating torque while minimizing friction and wear between the disc and seat. Its optimized sealing geometry ensures smooth operation, bubble-tight shut-off, and extended seat life, making it ideal for both manual and automated butterfly valve systems.

Precision PTFE lined valve seat for corrosive media

Top Stem Bushing

Equipped with a top stem bushing fixed by a stainless steel retaining ring, this structure effectively bears lateral side thrust generated by electric, pneumatic and manual actuators during operation, preventing valve stem bending, jamming and premature wear.

Acetal material is supplied as standard for general corrosive working conditions; wear-resistant PTFE bushing is available as an optional upgrade for ultra-corrosive, low-friction process lines, simplifying long-term valve maintenance.

Corrosion resistant PTFE lined valve body

Silicone Seat Energizer Between PTFE Seat & Valve Body

Continuous silicone elastic energizer is fitted between valve body and PTFE seat, wrapping the whole sealing zone including disc hub.

It supplies even lasting compression force to stiff PTFE liner, compensates thermal expansion and contraction of PTFE material, removes sealing gaps to achieve bubble-tight zero leakage. With great elasticity and medium resistance, it cuts valve operation torque and reduces abrasion of PTFE seat for longer service life.

Low Maintenance Design

The non-stick characteristics of PTFE reduce media adhesion and scaling, helping to maintain smooth operation while minimizing routine maintenance requirements
.
The compact structure also allows easy inspection and replacement of wear components when necessary.

1. Wafer Type PTFE Lined Butterfly Valve

Technical Specification

Item	Parameter
Size Range	DN50 - DN600 (2"-24")
Design Standard	EN593 API609 BS5155 MSS SP-67
Flange End Standard	DIN2501 PN10/16 ASME B16.5 150lb
Working Pressure	DN50-DN150: 16Bar; DN200-DN600: 10Bar
Top Flange	ISO5211
Test Standard	EN12266-1 ISO5258 API598
Seat Type	Split Body / PTFE Lining

Material Specification

Part	Material	ASTM
Body	Ductile Iron	A536 Gr.65-45-12
Body	Stainless Steel	A351 CF8M / CF8
Disc	WCB + PTFE/PFA	-
Disc	Stainless Steel + PTFE/PFA	-
Shaft	Stainless Steel	-
Seat	PTFE / PFA	-
Bushing	Bronze	B62
Seat Energizer	Silicone	-

Wafer PTFE Lined Butterfly Valve Dimension Drawing

Dimensions (Unit: mm)

DN	50	65	80	100	125	150	200
inch	2	2-1/2	3	4	5	6	8
A	143	150	160	178	190	200	240
B	78	83	94	116	132	145	180
L	43	46	46	52	56	56	60
W	30	30	30	30	30	30	40

DN	250	300	350	400	450	500	600
inch	10	12	14	16	18	20	24
A	273	319	346	375	406	438	495
B	216	235	284	322	365	396	446
L	68	78	78	102	114	127	154
W	40	40	45	50	50	65	70

✳ Other Special Material and Dimension Requested, Please Contact Us Directly

2. Lug Type PTFE Lined Butterfly Valve

Material Specification

Part	Material	ASTM
Body	Ductile Iron	A536 Gr.65-45-12
Body	Stainless Steel	A351 CF8M / CF8
Disc	WCB + PTFE/PFA	-
Disc	Stainless Steel + PTFE/PFA	-
Shaft	Stainless Steel	-
Seat	PTFE / PFA	-
Bushing	Bronze	B62
Seat Energizer	Silicone	-

Lug PTFE Lined Butterfly Valve Dimension Drawing

Dimensions (Unit: mm)

DN	50	65	80	100	125	150	200
inch	2	2-1/2	3	4	5	6	8
A	136	138	148	158	174	190	229
B	74	82	90	116	132	145	180
L	43	46	46	52	56	56	60
W	30	30	30	30	30	30	40

DN	250	300	350	400	450	500	600
inch	10	12	14	16	18	20	24
A	269	288	337	367	433	466	520
B	216	230	284	322	365	396	446
L	68	78	78	102	114	127	154
W	40	40	45	50	50	65	70

✳ Other Special Material and Dimension Requested, Please Contact Us Directly

Butterfly Valve Flow Coefficient Kv & Pressure Drop Reference Data

All concentric lug butterfly valves and wafer butterfly valves are equipped with complete opening-angle Kv flow coefficient table and GPM-PSI pressure drop nomograph, supporting metric & imperial dual-system pipeline design calculation for global industrial projects. Flow coefficient Kv represents the fluid throughput capacity of the valve; higher Kv value brings lower pipeline pressure loss and less operation energy consumption.

1. Kv Value Table at Different Opening Angle (DN50 ~ DN600, 10°~90° Full Open)

DN	10°	20°	30°	40°	50°	60°	70°	80°	90° Full Open
50	0.1	5	12	24	45	64	90	125	135
65	0.2	8	20	37	65	98	144	204	220
80	0.3	12	22	39	70	116	183	275	302
100	0.5	17	36	78	139	230	364	546	600
125	0.8	29	61	133	237	392	620	930	1022
150	2	45	95	205	366	605	958	1437	1579
200	3	89	188	408	727	1202	1903	2854	3136
250	4	151	320	694	1237	2047	3240	4859	5340
300	5	234	495	1072	1911	3162	5005	7507	8250
350	6	338	715	1549	2761	4568	7230	10844	11917
400	8	464	983	2130	3797	6282	9942	14913	16388
450	11	615	1302	2822	5028	8320	13168	19752	21705
500	14	791	1674	3628	6465	10698	16931	25396	27908
600	24	1222	2587	5605	9989	16528	26157	39236	43116

Table Instruction: Small opening 10°~30° for precise flow throttling; medium opening 40°~70° for circulating water regulation; 90° full open delivers maximum Kv value with minimum flow resistance for main pipeline isolation.

2. GPM & PSI Pressure Drop Nomograph Chart

Figure 1: Flow Rate & Pressure Drop Nomograph for Concentric Butterfly Valve

The pressure drop curve chart adopts US imperial units, with horizontal axis for flow rate GPM and vertical axis for differential pressure (PSI / Feet water head). Diagonal slant lines correspond to matching Kv/Cv flow coefficients, helping North American and ANSI standard clients quickly calculate pipeline medium pressure loss.

Horizontal axis: Flow range 100 ~ 100,000 Gallons Per Minute, covers DN50~DN600 full size flow demand;
Vertical axis dual units: PSI pressure difference and Feet water head, convenient for direct conversion of pipeline design parameters;
Operation logic: Locate flow GPM vertically intersect Kv diagonal line, horizontally read pressure drop value to judge system energy loss.

3. Combined Application of Kv Table & Pressure Drop Curve

Step 1: Confirm working opening angle (throttling / full open), extract Kv value from the table;
Step 2: Convert metric Kv to US Cv via formula: Cv = Kv × 1.156;
Step 3: Match Cv diagonal line on the GPM-PSI nomograph, calculate actual pipeline differential pressure;
Step 4: If pressure drop exceeds design allowable value, upgrade to larger DN butterfly valve to raise overall Kv flow capacity.

Catalog Technical Tips

Kv test standard: Clean water 15°C, SG=1, comply with EN 12266-1 & ISO5211;
Avoid long-term stable operation under 10°~20° small opening, high pressure drop will cause cavitation and seal abrasion;
The pressure drop nomograph only applies to liquid medium; gas & steam flow calculation requires special gas coefficient formula;
We provide dual system flow data to meet metric European projects and imperial US standard engineering selection demands.

Manufacturing Excellence

Quality Control

Certification Quality Standard

100% Pressure Tested API598 ISO9001 CE WRAS ACS

PTFE Lined Butterfly Valve-Frequently Asked Questions

What is a PTFE Lined Butterfly Valve?

A PTFE Lined Butterfly Valve is a quarter-turn valve with all wetted surfaces lined with PTFE (Polytetrafluoroethylene). The PTFE lining protects the valve body from corrosive media while providing excellent chemical resistance, reliable sealing, and long service life in demanding industrial applications.

What are the advantages of a PTFE Lined Butterfly Valve?

PTFE lined butterfly valves offer outstanding resistance to acids, alkalis, solvents, and other aggressive chemicals. They provide low operating torque, bubble-tight sealing, reduced maintenance, and a cost-effective alternative to expensive alloy valves in corrosive service.

What industries commonly use PTFE Lined Butterfly Valves?

These valves are widely used in chemical processing, pharmaceutical manufacturing, chlor-alkali plants, water treatment, semiconductor production, mining, pulp & paper, food processing, and other industries handling corrosive fluids.

Which chemicals are suitable for PTFE Lined Butterfly Valves?

PTFE is compatible with a wide range of chemicals, including sulfuric acid, hydrochloric acid, nitric acid, sodium hydroxide, chlorine solutions, organic solvents, and many other corrosive media. Material compatibility should always be confirmed for specific operating conditions.

What is the difference between PTFE and PFA lining?

Both PTFE and PFA offer excellent chemical resistance. PTFE provides outstanding corrosion protection and low friction, while PFA offers improved flexibility and better performance in certain high-purity or high-temperature applications.

What is the maximum operating temperature of a PTFE Lined Butterfly Valve?

The operating temperature depends on the valve design and seat configuration. Standard PTFE lined butterfly valves typically operate from -20°C to +180°C (-4°F to +356°F). Higher temperature options may be available for special applications.

Can PTFE Lined Butterfly Valves be used for throttling service?

Yes. PTFE lined butterfly valves can be used for both on/off isolation and moderate flow regulation. However, continuous throttling under severe conditions should be evaluated according to the process requirements.

Why is a stainless steel core used inside the PTFE disc?

The stainless steel core provides the mechanical strength required to withstand operating pressure and torque, while the outer PTFE encapsulation protects the metal from direct contact with corrosive media.

What is the purpose of the silicone seat energizer?

The silicone seat energizer applies uniform pressure around the PTFE seat, ensuring reliable bubble-tight sealing, reducing operating torque, and compensating for minor wear during long-term service.

Are PTFE Lined Butterfly Valves suitable for vacuum service?

Many PTFE lined butterfly valves can be used in vacuum applications, depending on the valve construction and operating conditions. Please consult Laux Valve engineers for specific vacuum requirements.

Can the valve be equipped with electric or pneumatic actuators?

Yes. Laux PTFE Lined Butterfly Valves feature an ISO 5211 mounting pad, allowing easy installation of manual gear operators, pneumatic actuators, and electric actuators for automated process control.

What body materials are available?

Standard body materials include Ductile Iron, WCB Carbon Steel, CF8 (304 Stainless Steel), and CF8M (316 Stainless Steel). Other materials are available upon request for specialized applications.

How is the valve tested before shipment?

Every PTFE Lined Butterfly Valve undergoes rigorous quality control, including hydrostatic shell testing, seat leakage testing, dimensional inspection, and visual examination to ensure reliable performance before delivery.

Do you provide OEM and customized PTFE Lined Butterfly Valves?

Yes. Laux Valve offers OEM and customized manufacturing services, including custom sizes, body materials, PTFE/PFA lining options, flange standards, actuator configurations, branding, and packaging.

Why choose Laux Valve as your PTFE Lined Butterfly Valve manufacturer?

Laux Valve combines over 15 years of butterfly valve manufacturing experience with ISO-certified production, advanced machining, and strict quality control. We provide reliable PTFE lined butterfly valves with excellent chemical resistance, OEM customization, and professional technical support for customers worldwide.

LAUX Valve is a trusted OEM butterfly valve manufacturer, delivering customized valve solutions with reliable quality and global service.

Download Catalog

Butterfly Valve: Wafer Butterfly Valve; Lug Butterfly Valve; Double Flange Butterfly Valve; PTFE Lined Butterfly Valve; U-section Butterfly Valve; Grooved End Butterfly Valve; AWWA C504 Rubber Seated Butterfly Valve; Double Eccentric Flange Butterfly Valve

Knowledge Center: Butterfly Valve Basics; Butterfly Valve Material; Valve International Standards; Valve Selection Guide

No.3 Street,Beizhakou Town,Jinnan District,Tianjin.China

james@lauxvalve.com

+86 18920833829

We use Cookie to improve your online experience. By continuing browsing this website, we assume you agree our use of Cookie.