Description
Pneumatic Fluorine-lined Diaphragm Valves are heavy-duty, corrosion-resistant shut-off and throttling valves specifically engineered for handling highly corrosive media, organic solvents, and toxic fluids in chemical processing plants. Featuring a full fluoroplastic lining (PTFE, PFA, or FEP), these valves isolate the body from line media, offering superior performance over stainless steel in extreme chemical environments.
Designed for automated pipelines, these valves integrate seamlessly into systems alongside our high-performance butterfly valves and connect reliably using standard industrial flanges.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Nominal Diameter Range | DN15 to DN250 (1/2" to 10") |
| Nominal Pressure | PN6 / PN10 / PN16 / Class 150 |
| Body Material | Ductile Iron (GGG40), WCB, Stainless Steel (CF8/CF8M) |
| Lining Material | PTFE, PFA, FEP (F46), PO, E-CTFE |
| Diaphragm Material | PTFE + EPDM (Composite Dual-layer Design) |
| Working Temperature | -50°C to 180°C (-58°F to 356°F, depending on lining) |
| Connection & Standard | Flanged End (ASME B16.5, HG/T 20592, DIN EN 1092-1) |
| Actuation Type | Pneumatic (Normally Closed NC, Normally Open NO, Double Acting) |
Key Features & Fluorine Lining Benefits
Unlike standard metal valves, fluorine-lined diaphragm valves utilize advanced molding technology to bond fluoroplastics onto the inner body wall, providing critical advantages:
- Ultimate Chemical Resistance: Immune to strong acids (hydrochloric, sulfuric, hydrofluoric acid), strong alkalis, aqua regia, and organic solvents across various concentrations.
- Zero-Leakage Diaphragm Sealing: The dual-layer flexible PTFE/EPDM diaphragm completely separates the driving stem mechanism from the corrosive process media, preventing stem leakage and atmospheric contamination.
- High Reliability Pneumatic Actuation: Pre-installed pneumatic actuators allow rapid automatic control via solenoid valves, limit switches, and electro-pneumatic positioners for smart PLC integration.
Target Applications & Industries
Our pneumatic fluorine-lined valves are widely deployed in harsh industrial chemical pipelines:
- Chlor-Alkali & Acid Production: Handling liquid chlorine, hydrochloric acid, and caustic soda.
- Pickling & Steel Galvanizing: Acid regeneration and waste chemical treatment lines.
- Pharmaceuticals & Fine Chemicals: Purity-sensitive chemical synthesis and aggressive solvent handling.
- Semiconductor & Battery Manufacturing: Ultra-pure chemical distribution and wet etching systems.
Frequently Asked Questions (FAQ)
Q1: How do I choose between PTFE, PFA, and FEP linings?
PTFE offers universal chemical resistance up to 180°C. PFA is ideal for high-purity applications and severe thermal cycling. FEP (F46) provides excellent anti-permeation properties for temperatures below 150°C with optimal cost efficiency.
Q2: What action mode should be chosen for automatic safety shut-off?
We supply single-acting fail-safe pneumatic actuators (Normally Closed - Fail to Close, or Normally Open - Fail to Open) that automatically seal the valve during air pressure or power loss.
Q3: Can Oucang Valve customize matching flange dimensions?
Yes. As a direct factory manufacturer, Oucang Valve provides custom flange drillings, face-to-face dimensions, and accessory integration (limit switch boxes, air filter regulators).
About the Manufacturer: Oucang Valve
Oucang Valve is a professional ISO-certified direct manufacturer specializing in anti-corrosive fluorine-lined valves and forged pipe components. Operating our own integrated foundry and lining workshop, we deliver full material certification, spark testing for lining integrity, and rapid international export support.
- Core Capability: Electro-spark lining defect testing (15kV-25kV), custom PTFE/PFA solutions, and fast technical inquiry support.
- Quality Compliance: ASME, DIN, JIS, and GB piping standards.
- Factory Inquiry: Contact our engineering team for direct manufacturer pricing and chemical compatibility verification.
