Lined valve

Lined valves — Selection and installation guide

Design and application checks

A lined valve separates the fluid from the metal body through a specified lining system. PTFE, FEP and PFA are different fluoropolymers, and rubber linings form another material family.

FEP is commonly identified as F46 and PTFE as F4 in the existing product notation; they are not the same material. Confirm chemical concentration, temperature, permeation, solids, vacuum duty and cleaning method against the complete valve’s approved lining specification.

What should I provide for a quotation?

Provide the fluid and composition, solids content, normal and design pressure and temperature, DN or NPS, connection standard, installation orientation, operating duty and required inspection documents. State any corrosion, vacuum, fire-safety or emissions requirements separately.

How do I confirm the pressure and temperature rating?

Use the approved data sheet, nameplate and pressure–temperature limits for the complete valve, including its seat, lining and seals. PN, ASME Class and JIS K are different designation systems, not a fixed numerical conversion. A shared nominal size does not establish flange interchangeability.

What must be checked before installation?

Compare the face-to-face dimension, flange drilling and facing, pipe bore, flow direction and maintenance clearance with the approved drawing. Clean and isolate the pipeline, release pressure and follow the product installation instructions. Do not use flange bolts to pull misaligned pipework into position.

Related product categories

• Ball valves
• Butterfly valves
• Globe valves