Fluorine lined gate valve

Fluorine lined gate valve is a corrosion-resistant valve using fluoroplastic lining technology, designed specifically for corrosive media such as strong acids and alkalis, and widely used in industries such as chemical, pharmaceutical, and petroleum. The following is its core information:
1. Definition and Structure
Basic composition: composed of valve body, gate, valve stem, and fluoroplastic lining layer. The valve body is usually made of carbon steel or cast steel, lined with fluoroplastics such as polytetrafluoroethylene (PTFE).
Category:
According to the sealing surface structure: wedge gate type (single/double gate, elastic gate) and parallel gate plate.
According to the position of the valve stem: visible stem (the valve stem rises and falls with the gate) and hidden stem (the valve stem rotates but does not rise or fall).
2. Technical parameters
Pressure and temperature: nominal pressure 1.0-2.5MPa, applicable temperature -20 ℃~150 ℃ (PTFE lining).
Diameter range: DN15-DN300, some models can reach DN1200.
Material characteristics:
Lining materials: PTFE (F4), FEP (F46), etc., resistant to strong acids, strong alkalis, and organic solvents.
Valve body material: carbon steel (WCB), stainless steel (304/316L), etc.
3. Performance advantages
Corrosion resistance: It can withstand strong corrosive media such as 98% concentrated sulfuric acid, 37% hydrochloric acid, hydrofluoric acid, etc.
Low flow resistance design: Full bore flow channel, fluid resistance coefficient ≤ 0.5, reduced by 40% compared to ordinary gate valves.
Reliable sealing: The elastic gate design can automatically compensate for the deviation of the sealing surface, meeting the API 598 zero leakage standard.
4. Application scenarios
Chemical industry: pipeline control for corrosive media such as hydrochloric acid and sulfuric acid.
Pharmaceutical/Food: Sanitary grade fluorine lined gate valves (such as 316L stainless steel+PTFE) are used for high-purity fluids.
Environmental Protection/Water Treatment: Acid and Alkali Resistant Wastewater Discharge System.
5. Selection and maintenance
Selection criteria: The lining material and valve body material should be selected based on the characteristics of the medium, pressure rating, and temperature.
Installation requirements:
Double gate valves need to be installed vertically (with the valve stem facing upwards).
Models with bypass valves need to balance the pressure difference before opening.
Maintenance suggestion: Regularly lubricate the valve stem to avoid hard objects colliding with the lining layer.

选型建议