What specific industries and media are appropriate for this valve?

The PTFE Lined Knife Gate Valve is ideal for Chemical plants (handling sulfuric/nitric acid), Pulp & Paper (bleaching chemicals), and Pharmaceutical/Food industries requiring high purity. It is perfect for corrosive liquids, brine, viscous adhesives, and resins. However, it is unsuitable for high temperatures over 200°C or highly abrasive media like large sharp rocks.

PTFE Lined Knife Gate Valve - Worm Gear

Q: Why should I choose JRVAL as my source factory for these valves?

JRVAL is an ISO9001 and CE Certified source factory with a complete supply chain integrating casting, precision machining, and final assembly. The reliability and structural rationality of our products have been strictly verified by the global market for 20 years, ensuring factory-direct pricing, 100% quality traceability, and robust OEM capabilities.

Q: Does the PTFE lining guarantee a leak-proof seal?

Yes. The integrated PTFE seat provides bi-directional zero leakage shut-off, rigorously tested against ISO 5208 and API 598 standards. We pair the PTFE body with high-grade polished gates (SS316L, Duplex, or Titanium) featuring beveled edges to ensure smooth shearing and a perfectly tight seal without damaging the lining.

2in~48in; PN0~PN20 (Class125~150)

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Product Advantages

icon Fully Encapsulated Inert Barrier: The entire internal wetted area is lined with 3-5mm thick virgin PTFE/PFA, completely isolating the metal body from highly corrosive acids, alkalis, and toxic media.

icon Sealing: The elastomer-backed PTFE seat provides elasticity combined with chemical resistance, ensuring bi-directional, zero-leakage shutoff even under fluctuating pressure conditions.

Standards and Certifications

Design and Manufacture: MSS SP-81, ASME B16.34, JB/T 8691

Pressure & Temperature Rating: ASME B16.34

Side Flange Standards: ASME B16.5 (Class 150), EN 1092-1 (PN10/PN16), JIS B2220 (10K), AS 2129, GOST 33259

Top Flange (Actuator Mounting): ISO 5211; GB 90°

Face-to-Face Dimension: MSS SP-81, EN 558-1, GB/T 12221

Testing Standards: API 598, MSS SP-81, ISO 5208, EN 12266-1

Certifications: ISO 9001; CE; BV; API 609; API 598; EAC; SIL3；

Technical description

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Q&A

Specification of the Valve

Valve Type	PTFE Lined Knife Gate Valve
Connection	Wafer, Lug, Flanged
Actuation	Manual / Pneumatic / Electric / Bevel Gear
Size Range	DN50 ~ DN1200 (NPS 2" ~ 48")
Pressure Rating	PN6/ PN10 / PN16 / Class 125/ Class 150 / JIS 10K
Target Medium	Corrosive acids, Strong alkalis, Sticky slurries, Resins
Operating Temp.	-20℃ ~ +200℃ (Determined by PTFE/PFA lining limits)

Material Configuration

Body Material	Base: WCB, CF8, CF8M, Ductile Iron Lining: Fully encapsulated PTFE / PFA (3-5mm thickness)
Gate / Blade	SS316L, Duplex 2205, Titanium, Hastelloy, or PTFE Coated
Stem	Stainless Steel: SS410, SS304, SS316
Seat (Seal)	Integral PTFE (Zero Leakage, Bi-directional available)
Packing	Pure PTFE / PTFE impregnated synthetic fiber

Engineered for Severe Corrosion: Optimal Applications

Chemical & Petrochemical

Why it fits: Handles extreme corrosive media like sulfuric acid, nitric acid, and chlorine. The full PTFE lining ensures aggressive chemicals never touch the metal body, drastically reducing lifecycle costs compared to solid Titanium or Hastelloy valves.

Pulp & Paper (Bleaching)

Why it fits: The bleaching process utilizes chlorine dioxide, which rapidly corrodes standard stainless steel. A PTFE-lined valve body paired with a Titanium gate offers unparalleled durability and zero contamination in paper stock lines.

Mining (Acid Leaching)

Why it fits: Hydrometallurgy and heap leaching processes transport highly acidic mineral slurries. The PTFE lining resists the chemical attack, while the knife gate mechanism efficiently shears through suspended mineral solids without jamming.

Adhesives & Viscous Media

Why it fits: Handling glues, resins, and polymers often results in valves seizing due to media buildup. The inherently non-stick (low-friction) surface of PTFE prevents these sticky substances from adhering to the valve bore and seat.

Pharmaceutical & Food Processing

Why it fits: Maintaining pure, sanitary lines is critical. Our virgin PTFE is non-toxic, FDA-compliant, and prevents biological or chemical contamination. The smooth bore design makes CIP (Clean-in-Place) operations highly efficient.

Desalination & Brine Handling

Why it fits: High-concentration brine quickly pits and degrades standard metals via chloride stress corrosion. A PTFE lined body completely isolates the structural metal from the brine, ensuring long-term operational safety and zero leaks.

QUALITY & COMPLIANCE CERTIFIED

PTFE Lined Knife Gate Valve - Ultimate Chemical Resistance

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Sample MTC (EN 10204 3.1) - Material Traceability

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PTFE Lined Knife Gate Valve: Technical FAQs

What makes the PTFE Lined Knife Gate Valve highly effective for severe chemical applications?

By integrating a 3-5mm fully encapsulated virgin PTFE lining, this valve provides supreme performance:

Ultimate Chemical Resistance: The metal body is completely isolated, making it highly resistant to strong acids, alkalis, and halogens (like chlorine).
Zero-Sticking Performance: PTFE's ultra-low friction coefficient prevents viscous media, resins, and sludges from adhering to the bore, stopping valve jamming.
Cost-Effective Alloy Alternative: Achieves the same anti-corrosion level as expensive solid Titanium or Hastelloy valves at a fraction of the cost.

Why should I choose JRVAL as my source factory for these valves?

JRVAL is a premier manufacturer offering unparalleled production control:

20 Years of Market Verification: The reliability and structural rationality of our valves have been proven by real-world applications across global markets for two decades.
Integrated Manufacturing: We are a true source factory integrating casting, precision machining, and final assembly, ensuring 100% quality traceability.
ISO9001 & CE Certified: Our rigorous production standards meet all major international requirements for the Middle East, European, and Asian markets.

What specific industries and media are appropriate (and inappropriate) for this valve?

Our PTFE Lined Knife Gate Valve is engineered for specific harsh environments:

Best Industries: Chemical plants (sulfuric/nitric acid), Pulp & Paper (bleaching chemicals), and Pharmaceutical/Food (requires sanitary, FDA-compliant purity).
Ideal Media: Highly corrosive liquids, concentrated brine, viscous adhesives, resins, and fine chemical sludges.
Unsuitable Applications: High temperatures exceeding 200°C (PTFE degrades) or high-velocity pipelines carrying highly abrasive, sharp solids (like large rocks or scrap metal which may gouge the lining).

Does the PTFE lining guarantee a leak-proof seal?

Yes, through our advanced engineering and machining precision:

Bi-directional Zero Leakage: The integrated PTFE seat provides an exceptionally tight shut-off in both flow directions, tested strictly against ISO 5208 / API 598 zero leakage standards.
Premium Blade Match: We pair the PTFE body with high-grade SS316L, Duplex, or Titanium gates with polished beveled edges to ensure smooth shearing without damaging the seal.