Product Description

PTFE-Lined Valve Product Introduction & Technical Specifications

1. Product Introduction

A PTFE-lined valve is a corrosion-resistant valve with a composite structure of a metal shell lined with fluoropolymers. Using compression molding or insert molding processes, fluoroplastics such as PTFE (F4), FEP (F46), and PFA are lined on the parts in contact with the medium, such as the valve body and plug. It combines the mechanical strength of the metal shell with the excellent corrosion resistance of fluoroplastics, and is specially designed for pipelines with highly corrosive media.

2. Technical Specifications

 Nominal Diameter (DN): 152000mm (common range DN15DN500)

 Nominal Pressure (PN):

o GB standard: PN0.6, PN1.0, PN1.6, PN2.5MPa

o ASME standard: CLASS150-600LB

 Temperature Range:

o PTFE (F4): -20 150

o FEP (F46): -50 150

o PFA: -80 260 (high-temperature type)

 Design Standards: HG/T3704, GB/T12238

 Face-to-Face Dimensions: GB/T12221, ASME B16.10

 Flange Standards: GB/T9124, HG/T20592, ASME B16.5

 Test Standards: GB/T13927, API 598 (Strength / Sealing)

 Leakage Class: Class VI (bubble-tight zero leakage)

3. Main Component Materials

Valve Body Shell (Pressure-bearing Parts)

 Carbon steel: WCB, Q235-B, 20# (general use)

 Stainless steel: CF8 (304), CF8M (316), CF3 (304L)

 Ductile iron: QT450-10 (commonly used for butterfly valves)

Lining / Sealing Materials (Core)

 PTFE (Polytetrafluoroethylene / F4): Strong corrosion-resistant, non-stick, temperature range -20150

 FEP (F46): Thermoplastic processable, same temperature resistance as PTFE, better toughness

 PFA (Perfluoroalkoxy): High temperature resistant up to 260, high purity, easy to mold

 PCTFE (F3): Low temperature resistant down to -195, high mechanical strength

Internal Parts (Stem / Ball / Disc)

 Valve stem: 2Cr13, 304, 316 (surface fluorine-lined / hardfaced)

 Ball / Disc: Carbon steel / stainless steel with full fluoroplastic lining

4. Product Features

 Superior Corrosion Resistance: Resists almost all highly corrosive media such as sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, strong alkalis, and organic solvents.

 Excellent Sealing: Fluoroplastics have good elasticity, achieving zero leakage in compliance with Class VI standards.

 Smooth Flow Path: No dead corners, non-fouling, low resistance, and anti-sticking properties.

 High Mechanical Strength: Metal shell withstands pressure while the lining prevents corrosion, ensuring long service life.

 Wide Temperature Range: Conventional range -50150, high-temperature PFA type up to 260.

 Hygienic & Clean: No leachable substances, easy to clean, suitable for food and pharmaceutical applications.

 Easy Operation: Simple structure with low opening/closing torque.