A lined wafer-type swing check valve is a type of check valve made of polytetrafluoroethylene (PTFE) used in industrial applications. This check valve type is often used to prevent the flow of fluids such as oil, water, and gas. These valves are also used in the food and beverage industry to prevent the flow of liquids into the food processing equipment.
The lining of a PTFE-lined wafer-type swing check valve is made from PTFE that has been coated with a thin layer of a fluorine-based polymer called fluoropolymer. This coating makes the valve resistant to corrosion and can help prevent the valve from leaking. The lining of a PTFE-lined wafer-type swing check valve also has a small opening that allows the valve to open when pressure is applied to it.
PTFE Lined Swing Check Valve Specifications
| DECRIPTION | MOC |
|---|---|
| Design Std | BS 5351 |
| Body | DI / ASTM A216 GR WCB / CF8 / CF8M |
| Flap Disc | 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 & Features
- The PFA lined Ball Check Valve are developed for use in extremely corrosive applications, full port design can be installed either vertically and dependent upon application horizontally as well.
- Lining material such as PFA and conductive PFA have exceptional corrosion resistance.
- The VCF valves are available for the connection with DIN EN 1092-1 or ANSI B16.5 flanges from DN 15-½” to DN 200-8”.
- A swing check valve is a butterfly-style check valve in which the disc, the movable part to block the flow, swings on a hinge or grunion, either onto the seat to block reverse flow or off the seat to allow forward flow.
- The seat opening cross-section may be perpendicular to the center line between the two ports or at an angle.
- Swing check valve shut off depends on gravity and reverse flow.
- To affect complete shut off, the disc of a swing check valve must travel through a 90 angle arc to the swing check valve seat.
