A PTFE-lined ball valve is a type made from a polytetrafluoroethylene polymer (PTFE). PTFE is a synthetic material widely used in high-temperature applications, such as gas lines and valves. PTFE is also used in medical devices, such as stents and blood vessels. PTFE has many advantages over other materials, including its low cost and ease of use.
PTFE is also resistant to corrosion, making it an ideal material for applications requiring high corrosion resistance levels. While PTFE is not the only material used for a lined ball valve, it is the most common material used in lined ball valves.
PTFE Lined Ball Valve Specifications
| DECRIPTION | MOC |
|---|---|
| Design Std | BS 5351 |
| Body | DI / ASTM A216 GR WCB / CF8 / CF8M |
| Ball | DI / ASTM A216 GR WCB / CF8 / CF8M |
| Material | Ductile iron material – ASTM A395 (60-40-18) CAST carbon steel ASTM A216WCB |
| Lining | PFA / FEP / PVDF / HDPE / PP |
| Lining Thickness | 3mm Minimum |
| Spark Test | 15 KVDC |
| Flange Connection | ANSI B16.5, #150 / Customer requirement |
Design, Standard & Feature
- Ball is fully encapsulated in PFA/FEP
- Valves supplied with anti-static devices for protection against potentially dangerous electrostatic discharge
- Interior valve bodies as well as the stem and ball are individually lined with PFA or PVDF/FEP
- Anti-blow out stem assembly for preventing stem blow out even when top gear is disassembled
- All inherent design features of a conventional ball valve such as low torque, quarter-turn operation, bubble tight shut off and a minimum pressure drop
- Short pattern face to face dimension in accordance with ANSI B16.10 and ANSI B 16.5, 150 lbs.(flange dimension) – facilitating replacement of fully lined or sleeved plug valves with ptfe lined ball valves without altering existing pipework
- Free floating Ball Valve Principle ensures the ball seals against the downstream seat ring giving a positive sealing force even when line pressure is low
