Lined lug type butterfly valve are divided into handle drive, worm gear drive, pneumatic and electric; the valve body is divided into two types: full lining and half lining. Full lining means that the valve seat and valve plate are fully lined with tetrafluoroethylene materials such as PFA/PTFE/FEP ect. Half lining means that the valve plate is not lined, using stainless steel SUS304 or SUS316 and other materials
2/Two-piece Lined lug type butterfly valve
Lined lug type butterfly adopts a 2/Two-piece valve body combination, the valve seat and the valve body lining are integrated, in the fully lined configuration, the lined passage and lined disc contact the medium. In the semi-lined configuration, the disc is unlined and also contacts the medium. Confirm the exposed materials, lining coverage and compatibility for the selected service. For the described assembly, the use of four-pole sealing structure and the sealing surface with a temperature-resistant and anti-aging SI rubber elastic gasket, requires confirmation of the specified shell and seat leakage acceptance criteria, test conditions and material compatibility for the selected assembly.
PTFE Lined lug type butterfly valve
For the PTFE-lined configuration, confirm the lining grade and the documented pressure-temperature limits of the complete valve assembly. General properties of PTFE resin are not the operating rating of the assembled valve. Confirm compatibility with the actual medium, concentration and operating conditions before selection.
PFA Lined lug type butterfly valve
PFA Lined lug type butterfly valve uses fluoroplastic PFA as the lining material, and PFA plastic is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene. PFA and PTFE are distinct lining options; their properties must not be assumed identical or interchangeable. Confirm the actual lining grade, compatibility and complete valve operating limits for the intended service.
FEP Lined lug type butterfly valve
FEP Lined lug type butterfly valve uses fluoroplastic FEP as the lining material，The full name of FEP is Fluorinated ethylene propylene, which is translated into fluorinated ethylene propylene copolymer (perfluoroethylene propylene copolymer). English trade name: Teflon* FEP is a class of chemical substances. FEP is a copolymer of tetrafluoroethylene and hexafluoropropylene.
The fluorine-lined lug butterfly valve has strong corrosion resistance and can pass through various acidic and alkaline media, effectively ensuring the safety of pipeline equipment.
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Frequently Asked Questions
How do I specify a fully lined valve instead of the partially lined alternative?
State the required lining and disc coverage explicitly. Ask for the wetted-parts specification and drawing for the exact valve, including the body, seat, disc and seals, rather than relying only on the general lined-valve description.
Can I choose PFA, PTFE or FEP solely by the material name?
Provide the actual medium, concentration and pressure-temperature conditions and request confirmation for the complete lined assembly. PFA, PTFE and FEP are distinct options, not a universal compatibility or common temperature-rating guarantee.
What should I check before ordering the handle-operated lug configuration?
Send the mating flange details, required size and available lever clearance. Confirm the bolting arrangement, operating requirements and exact valve drawing for the selected handle-operated assembly.