Design And Selection Of Pfa Lined Gate Valves

For chemical processing, specify PFA lined globe valves (flanged, DN15-DN300, PN10/PN16/150LBS, handwheel) for shut-off and throttling of corrosive media. Full PFA lining isolates the metal body from acids and caustics. Select for temperatures from -29°C to 200°C. Install in acid transfer, chemical feed, and process control lines. The globe valve enables precise flow regulation. This design prevents corrosion, leakage, and metal ion contamination.

Corrosive Media Flow Control Challenges

Standard globe valves corrode in acid and caustic service. Pitting and crevice corrosion develop in unprotected metal bodies. Unlined valves fail rapidly in aggressive chemical environments. The globe valve's flow path changes direction, enabling throttling.

Key threats addressed:

• 🔥 Corrosion – chemical attack on metal wetted parts.

• 💧 Leakage – seal degradation from chemical exposure.

• 🧪 Contamination – metal ions leaching into product streams.

• ⚙️ Process variability – inconsistent flow control.

The pfa lined globe valve provides resistance to strong acids and oxidizers. The fluoropolymer liner prevents direct metal contact with corrosive fluids.

Design and Specifications

The globe valve features a disc that moves vertically against a seat. The PFA lining covers all wetted surfaces, including body, bonnet interior, disc, and seat. Flanged connections (EN, ASME) enable direct installation. The handwheel mechanism allows manual operation and flow adjustment.

Key specifications:

• Body material: WCB or CF8/CF8M with PFA lining

• Lining: PFA (full wetted)

• Connection: Flanged (EN 1092-1, ASME B16.5)

• Sizes: DN15 to DN300

• Pressure: PN10, PN16, Class 150

• Temperature: -29°C to 200°C

The disc and stem are designed as an integral unit to prevent internal component displacement. Lining thickness is typically 3-4mm for corrosion resistance.

Applications in Chemical Processing

PFA lined globe valves are installed in chemical plants, petrochemical refineries, and pharmaceutical manufacturing.

Typical applications:

• Acid and caustic transfer lines

• Chemical feed and dosing systems

• Solvent processing units

• Chlor-alkali process plants

• Pharmaceutical intermediate transfer

These valves are used for both on/off service and throttling. The globe valve design provides better throttling capability than gate or ball valves due to the disc's guided movement.

Valve Type Comparison

Installation and Operation

Installation requires aligning flanges with appropriate gaskets. The valve should be installed with handwheel accessible. Proper support prevents pipe stress.

Installation points:

1. Align flanges with proper gaskets.

2. Tighten bolts evenly to specified torque.

3. Check handwheel operation for smooth movement.

4. Verify seal integrity after installation.

The globe valve can be operated at any position between fully open and fully closed. For throttling applications, position the disc to achieve desired flow rate. PTFE packing provides stem sealing performance.

Why Specify PFA Lined Globe Valves

1. Provides both shut-off and throttling capability.

2. Offers flanged connections for permanent installation.

3. Supports temperatures from -29°C to 200°C.

4. Resists strong acids, caustics, and solvents.

5. Enables precise flow control with handwheel.

The PFA lined globe valve is a solution for chemical processing requiring reliable flow control in corrosive service. The pfa lined globe valves design provides both shut-off and throttling capability with reduced maintenance. PFA's chemical resistance minimizes corrosion and degradation risks. Specify PFA lining based on process temperature and chemical exposure to ensure reliable performance. The design meets HG/T 3704 and GB/T 12235 standards.

FVF PFA Lined Globe Valve

• FVF Lined globe valve is fully lined with fluorine materials.It has good anti-corrosive function and it is a better choice to shut-off in corrove pipeline.
• Globe valve refers to the valve with disc driven by stem along the central axis to make lifting movement, is a common block valve,used to connect or throttle medium.
• It has the advantage of compact structure, flexible on-off, strong corrosion resistance, trip shorted and widely applicated in chemical, petroleum, pharmaceutical, food, metallurgy, paper, hydropower, environment protection etc.

Product Parameter

Materials of Main Parts

Technical Specification