Classification And Selection Of 3pc Flanged Ball Valve

Introduction to 3PC Flanged Ball Valve and Special Corrosion-Resistant Valves:

Fluorine-lined valves, also known as fluoroplastic-lined corrosion-resistant valves, are manufactured by molding (or inserting) polytetrafluoroethylene resin onto the inner wall of the valve's pressure-bearing components or the outer surface of the valve's trim. (This same method is also used for lining various pressure vessels and piping accessories.) This unique corrosion-resistant property is utilized to create these valves. Simply put, fluorine-lined valves are lined with a process that covers all areas of the valve body accessible to the medium.

Fluorine-lined valves are typically lined with fluoroplastics such as FEP (F46) and PCTFE (F3). They are suitable for use in pipelines handling various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, various organic acids, strong acids, strong oxidizers, and other corrosive media. However, fluorine-lined valves are subject to significant temperature limitations and are only suitable for use with media between -50°C and 150°C.

Fluorine-lined Valves and Corrosion-Resistant Specialty Valves:

Common fluoroplastic-lined valves include: fluoroplastic-lined butterfly valves, fluoroplastic-lined ball valves, fluoroplastic-lined globe valves, fluoroplastic-lined diaphragm valves, fluoroplastic-lined gate valves, and fluoroplastic-lined plug valves.

1. Fluorine-lined Ball Valves

Ball valves with a fluoroplastic lining offer exceptional chemical stability and are suitable for use with any highly corrosive chemical media. They feature a full-pass floating ball valve design, ensuring leak-free shutoff across the entire pressure range, facilitating piping system maintenance and ball cleaning.

2. Fluorine-lined Butterfly Valves

They are used in applications requiring reliable sealing and excellent regulating characteristics. Fluorine-lined butterfly valves feature a split-body design. The seal at the valve shaft end is controlled by a fluororubber-coated rotating surface between the disc and seat, resulting in a compact design, attractive appearance, streamlined manufacturing, and reliable performance. Fluorine-lined butterfly valves ensure that the valve shaft is isolated from the fluid in the chamber, making shaft replacement extremely convenient. Fluorine-lined butterfly valves can be replaced without disassembling the pipeline.

3. Fluorine-Lined Gate Valve

This is a common on-off valve. It uses a wedge-shaped gate valve with two sealing sides to connect or block the medium in the pipeline. Wedge-type gate valves do not allow for even a small amount of opening to act as a throttling device in the pipeline, as this prevents erosion by the high-speed flowing medium, which could accelerate damage to the sealing surface.

4. Fluorine-Lined Plug Valve

Its compact and rational structure minimizes the inner cavity of the valve body, reducing medium retention. Furthermore, a special molding process creates a high density sealing surface. Combined with the herringbone PTFE packing, the valve achieves zero leakage. This series is designed for automatic opening and closing of pipelines with various highly corrosive media.

5. Fluorine-Lined Globe Valve
This valve opens and closes by raising and lowering the disc. The disc and the inner surface of the valve body are entirely made of fluoroplastic lining. It offers advantages such as easy opening and closing, compact size, reliable sealing, simple structure, easy maintenance, and a wide range of applications.

6. Fluorine-lined Check Valves
Fluorine-lined check valves only allow flow in one direction and prevent reverse flow. These check valves typically operate automatically. The valve disc opens under pressure from flow in one direction. When the fluid flows in the reverse direction, the combined pressure of the fluid and the weight of the disc close the disc, shutting off flow. Fluorine-lined check valves include lift check valves, swing check valves, and wafer check valves. The H41F46 fluorine-lined check valve is suitable for use in pipelines carrying various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, various organic acids, strong acids, and strong oxidants at temperatures between -50°C and 150°C. FEP is also suitable for use in pipelines carrying various concentrations of strong bases, organic solvents, and other corrosive gases and liquids.