Features of Pneumatic PFA Disc Butterfly Valve
PFA disc butterfly valve: PFA enhances corrosion resistance and durability, especially for highly corrosive fluids like wet/dry chlorine gas or hydrochloric acid of the butterfly valve disc. PFA extends product life by resisting permeation and offers non-stick properties for smoother flow control.
PTFE fully lined seat of the butterfly valve: PTFE-known as the “King of Plastics” provides excellent corrosion resistance against acids, alkalis, organic solvents, and other aggressive chemicals. So the PTFE seat butterfly valve offers non-stick and low-friction properties for smooth operation.
Split body butterfly valve: the PTFE seat features an internal silicone strip inlay to ensure a tight seal. For one-piece body valves, the PTFE seat consists of an EPDM core with a PTFE outer layer.
WCB (ASTM A216 ) butterfly valve made of carbon steel, offering durability and strength for industrial environments. It is suitable for moderate to high-pressure applications.
Basic Info of Pneumatic PTFE Butterfly Valve
Material
| Part Name | Material/Method |
| Body | Ductile Iron, Casting Iron, WCB, LCB/LCC, Stainless Steel, Aluminium Bronze |
| Disc | Ductile Iron(Coated/Lined), WCB, LCB/LCC, Stainless Steel, Duplex Stainless Steel, Aluminium Bronze |
| Seat | PTFE/RPTFE, Rubber(EPDM/NBR/VITON), Nature Rubber, Silicon Rubber, PU, HNBR, Hypalon |
| Stem | 304, 316, 420(2Cr13), 431, 1.4462, 17-4PH, Monel |
| Actuator | Pneumatic, Handlever, Worm Gear, Electric |
Technical Parameters
| ITEM | Standard |
| Design | EN593 | API609 |
| Face to Face | EN558 | ISO5752 | API608 | BS5155-4 |
| Top Flange | ISO5211 |
| Flange Drilling | PN6 | PN10 | PN16 | ASME B16.5 CL150 | JIS 10K |
| Pressure Rating | PN6 | PN10 | PN16 | PN25 | CL150 | JIS 10K |
| Tightness Test | ISO5208 | API598 | EN12266-1 |
Dimensions of Pneumatic PFA Disc Wafer Butterfly Valve
| SIZE | øD | øD1 | L | H | H1 | H2 | ø2 | ø3 | 4-ød1 | T*T |
| DN40 | 72 | 43 | 33 | 25 | 121 | 61 | 50 | 65 | 7 | 9 |
| DN50 | 76.3 | 52.8 | 42 | 25 | 131 | 66 | 50 | 65 | 7 | 9 |
| DN65 | 89 | 64.6 | 44.7 | 25 | 142 | 71 | 50 | 65 | 7 | 9 |
| DN80 | 103.9 | 79.1 | 45 | 25 | 150 | 83 | 50 | 65 | 7 | 9 |
| DN100 | 135 | 104.4 | 51.2 | 25 | 170 | 102 | 70 | 90 | 10 | 11 |
| DN125 | 159 | 123.3 | 54.4 | 25 | 184 | 117 | 70 | 90 | 10 | 14 |
| DN150 | 188.4 | 155.6 | 55 | 25 | 200 | 130 | 70 | 90 | 10 | 14 |
| DN200 | 238.2 | 202.5 | 58.8 | 35 | 240 | 162 | 70 | 90 | 10 | 17 |
| DN250 | 292.4 | 250.5 | 65.7 | 35 | 270 | 196 | 102 | 125 | 12 | 22 |
| DN300 | 344.2 | 301.6 | 76 | 35 | 310 | 216 | 102 | 125 | 12 | 22 |
| DN350 | 375.2 | 333.4 | 76.5 | 45 | 368 | 260 | 102 | 140 | 12 | 22 |
| DN400 | 439.5 | 389.6 | 85.7 | 50 | 400 | 315 | 140 | 175 | 18 | 27 |
| DN450 | 490.5 | 440.5 | 104.6 | 50 | 422 | 340 | 140 | 175 | 18 | 27 |
| DN500 | 535.4 | 491.6 | 130.2 | 55 | 480 | 379 | 140 | 175 | 18 | 32 |
| DN600 | 654.3 | 592.5 | 151.3 | 68 | 562 | 438 | 165 | 210 | 23 | 36 |
Application of Corrosion Resistant Butterfly Valve
- Chlorine: fluorine lined butterfly valve handles chlorine gas, sodium hypochlorite, and other chlorine-based chemicals.
- Chemical Processing: chemical butterfly valve handles acids, alkalis, solvents, and other process chemicals.
- Pharmaceutical: PTFE lined valve handles purified water, pharmaceutical chemicals, and cleaning solutions.
- Pulp & Paper: PFA lined butterfly valve handles pulp slurry, bleaching chemicals, black liquor, and wastewater.
- Semiconductor: PTFE lined butterfly valve handles ultra-pure chemicals such as HF, HCl, H₂SO₄, and DI water.
- Electroplating: Handles plating solutions such as chromic acid, nickel sulfate, copper sulfate, and sulfuric acid.
Component of Pneumatic Butterfly Valve
Manufacture Process of Pneumaitc Wafer Butterfly Valve
ZFA Certificates-Chinese Butterfly Valve Manufacturer
WRAS
CE
ISO 9001
EAC Russia
FAQ for Air Operated PTFE Seat PFA Disc Butterfly Valve
Q1: What are the key advantages of butterfly valves with PFA-coated discs compared to other types?
A: PFA (perfluoroalkoxy) coatings offer exceptional chemical resistance and a non-stick surface that prevents material buildup.
Unlike standard discs (made of ductile iron or even SS304/SS316), PFA-lined discs can withstand highly corrosive media—such as wet chlorine gas, sulfuric acid, and strong alkalis—thereby significantly extending the valve’s service life in chemical processing plants.
Q2: Composition and function of the triplex pneumatic butterfly valve
Filter
The filter cleans compressed air by removing impurities and moisture, ensuring pure air enters the pneumatic actuator. This prevents pipeline blockages and reduces actuator wear.
Pressure Regulating Valve
The pressure regulating valve stabilizes air pressure entering the actuator, preventing irregular operation and excessive valve wear. It maintains safe pressure levels, extending actuator life and ensuring smooth performance.
Lubricator
The lubricator adds a small amount of oil to the air, reducing friction in the actuator for smoother operation. Lubrication is vital for frequent valve use, extending equipment life and ensuring proper function.
Q3: What is the difference between a PTFE-seated butterfly valve and a fully PTFE-lined butterfly valve?
A: A PTFE-seated butterfly valve features only a PTFE sealing ring, meaning exposed metal parts may still exist on the valve body or disc.
In contrast, a fully PTFE-lined butterfly valve features a lining that completely covers the internal valve body cavity and the disc with fluoroplastic; this ensures that corrosive media are entirely isolated from the metal body, preventing any contact.
Q4: Key Considerations for Choosing a Pneumatic Actuator for PTFE butterfly valve.
- Match: Select an actuator that fits the valve size and type for proper system operation.
- Control Mode: Choose the right control mode (e.g., double-acting or single-acting) based on process and control needs.
- Environmental Conditions: Consider temperature, humidity, and corrosion at the installation site, and select suitable actuator materials and protection levels.
- Control Signals: Ensure the actuator’s control signal types and interfaces are compatible with the control system.
Q5: Does this pneumatic actuator support both double-acting and spring-return (fail-safe) options?
A: Yes. ZFA Valve offers both double-acting (DA) and single-acting/spring-return (SR) pneumatic actuators. The spring-return option ensures the valve automatically returns to a fully closed or fully open position (fail-safe function) in the event of air supply pressure loss.
Q6: Can the PTFE seat on this wafer-style butterfly valve be replaced?
A: Yes, our wafer-style butterfly valves feature a replaceable, resilient PTFE seat design. This modular design allows users to easily replace the sealing element during routine maintenance without replacing the entire valve body, thereby significantly reducing long-term operating costs.
Q7: Does ZFA Valve offer customization and OEM services for chemical control valves?
A: Certainly. As a professional valve manufacturer operating in China since 2006, we provide comprehensive OEM services. We can customize products to meet your specific piping requirements.
