Lug Type PTFE fully lined butterfly valve
What are the Design Features of lug type PTFE lined butterfly valve to look out for?
- -A butterfly valve that complies with the requirements of the heating system regulations
- -Top flange that conforms to EN/ISO 5211
- -Fully PFA lined disc and body provide unsurpassed resistance to corrosion, permeation and microbial contamination for maximum purity and reliability with minimum maintenance.
- -Durable, spherically molded PFA or PTFE liner and matching disc interface to form a tight bidirectional seal.
- -Full width 360° energized backup seat provides uniform sealing.
- -live-loaded, stem sealing system self-adjust to eliminate leak paths and reduce fugitive emissions for long-term, maintenance-free operation.
- -Extended PTFE/PFA lining forms a protective sleeve shielding the stem from corrosive media and eliminating leak paths.
- -PTFE/PFA disc over-molding is mechanically bonded to the base metal for full vacuum capability.
- -Streamlined disc engineered for maximum flow.
- -Energized flange seals maintain proper sealing between valve and flange.
PFA lined disc for full vacuum capability
Precision engineered for reliable, maintenance-free, the three steps stem sealing system provides unmatched sealing for long term zero leakage performance. The primary seal is created by the spherically molded PFA or PTFE body liner and matching disc hub interface. The elastomeric backup liner maintains tight contact pressure for consistent shutoff in high cycle applications. An independent secondary seal is formed by the extended body and disc liners. The flexible PFA/PTFE seat extends into the stem cavity and the disc lining envelops the stem. The resulting protective sleeve eliminates potential leak paths for fugitive emissions and shields internal components from contact with the media. This feature works in conjunction with the tertiary safety seal to ensure compliance with ISO 15848-1 standards for fugitive emissions.
The third sealing mechanism in the three steps stem sealing system is a Belleville springs with FPM O-rings safety seal. Completely isolated from the process media, the safety seal self-adjusted for changes in temperature and wear to ensure absolute zero leakage shutoff of corrosive and ultrapure process media.
Kinds of disc for options
High performance PFA liner?
- -Melt processable for precise molding of parts with smoother surface finishes than PTFE liners.
- -Superior flexibility to withstand repeated flexing and dynamic loads for extended service life.
- -Higher resistance to permeation for increased durability with lower total cost of ownership.
- -Lower particle shedding for maximum purity.
- -Superior creep resistance at high temperatures.
-Increased resistance to microbial contamination.
PFA fully lined lug type butterfly valve
