Key Design Considerations And Selection Of Fluorine-lined Gate Valves

A lined globe valve provides precise flow control and positive shutoff for corrosive media. The fluoropolymer lining protects the metal body from chemical attack. PTFE handles -29°C to 180°C. PFA serves up to 200°C. FEP covers -29°C to 150°C.

How to select a lined globe valve with the right standards?

1. Identify the piping system standard (ASME or EN/DIN).

2. Choose pressure class (Class 150/300 or PN 10/16/25/40).

3. Match face-to-face dimensions (ASME B16.10 or EN 558-1).

4. Specify lining material (PTFE/PFA/FEP) for the temperature.

5. Add fugitive emissions class if required (ISO 15848-1).

Common Compliance Pitfalls – What to Avoid

• ❌ Mixing ASME flanges with PN piping requires adapters

• ❌ Ignoring temperature derating: check the P-T curve

• ❌ Skipping spark testing: pinholes go undetected

• ❌ Mismatched face-to-face: wrong dimensions prevent installation

Why Design Standards Matter

Standards define pressure-temperature limits, dimensional tolerances, and testing procedures.

Benefits:

• Interchangeability: valves fit existing piping

• Safety: pressure ratings match system requirements

• Testing: standardized procedures validate performance

API 623 provides additional face-to-face requirements complementary to ASME B16.34.

Pressure-Temperature Ratings

Ratings define maximum allowable working pressure at a given temperature.

Common ratings:

• Class 150: 1.9 MPa at ambient, derated at elevated temperatures

• Class 300: 5.1 MPa at ambient, derated at elevated temperatures

• PN 10: 1.0 MPa, PN 16: 1.6 MPa, PN 25: 2.5 MPa, PN 40: 4.0 MPa

Temperature limits:

• PTFE-lined: 180°C maximum

• PFA-lined: 200°C maximum

• Derating: 25% reduction at 150°C, 40% at 180°C

Face-to-Face and Flange Dimensions

Standard lengths (Class 150, ASME B16.10 / EN 558-1):

• DN 25: 160 mm, DN 50: 230 mm, DN 80: 310 mm

• DN 100: 350 mm, DN 150: 480 mm

Flange requirements:

• Liner extends to flange face for full-face sealing

• Raised or flat face per piping standard

• Bolt circle and bolt count per standard

A ptfe lined globe valve with ASME B16.10 installs without pipe modification. A pfa lined globe valve with EN 1092-1 connects to European-standard systems.

Lining Material and Testing – HG/T 3704-2024

Key requirements:

• Liner thickness: minimum 2-3 mm

• Liner adhesion: mechanical locking via dovetail grooves

• Spark testing: 10,000V or 20,000V to detect pinholes

• Pressure testing: hydrostatic and pneumatic per standard

Fugitive Emissions – ISO 15848-1

Leakage classes:

• Class A: ≤ 10⁻⁵ Pa·m³/s

• Class B: ≤ 10⁻⁴ Pa·m³/s

• Class C: ≤ 10⁻³ Pa·m³/s

PTFE stem packing typically achieves Class B or A when properly torqued.

Compliance Decision Checklist

1. Identify piping standard:

   • ASME → B16.5 flanges, B16.10 dimensions

   • EN/DIN → EN 1092-1 flanges, EN 558-1 dimensions

2. Select pressure class:

   • ≤1.9 MPa → Class 150 or PN 16

   • ≤5.1 MPa → Class 300 or PN 40

3. Select lining material:

   • Standard acids ≤120°C → PTFE

   • Hot acids >120°C or oxidizers → PFA

   • Steam ≤150°C → FEP

4. Confirm face-to-face dimensions match piping layout

5. Add ISO 15848-1 if fugitive emissions required

6. Specify spark testing per HG/T 3704-2024

7. Verify all components align with the same standard family

ASME systems: Specify ASME B16.34, B16.10, B16.5. A ptfe lined globe valve in Class 150 suits most acid services to 180°C.

EN/DIN systems: Specify EN 12516, EN 558-1, EN 1092-1. A pfa lined globe valve in PN 16 handles hot acids to 200°C.

Fugitive emissions: Add ISO 15848-1 for low-leakage applications.

Verify the P-T rating against system surge pressure. Confirm dimensions match piping layout. Never install without confirming all standards align with the piping system.

FVF PTFE PFA FEP Lined Globe Valve With Pneumatic Actuator

• 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.
• They can be equipped with handwheels or can be actuated with electric or pneumatic actuators. A full range of accessory items are available including limit switches, solenoid valves, positioners and manual override devices.

Product Parameter

Materials of Main Parts

Technical Specification