Ptfe fjärilsventiler inkluderar huvudsakligen mitt-tätningsfjärilventiler, en-excentriska fjärilsventiler, dubbel-excentriska fjärilsventiler och trippel-excentriska fjärilsventiler . Dessa typer skiljer sig åt i strukturella design och applikationsscenarier:
Center-Seal Butterfly Valve: Ventilaxeln sammanfaller med mitten av fjärilsplattan och mitten av ventilkroppen . Den har en enkel struktur och är lämplig för lågtryck (PN mindre än eller lika med 1. 6MPA) och normal temperatur ({{4 ~) Dräneringsrör . Typiska modeller inkluderar D71X (skivtyp) och D41X (flänsstyp).
Single-eccentric butterfly valve: The valve shaft deviates from the center of the butterfly plate by about 1/3 radius, reducing the friction of opening and closing. It is suitable for clean pipes such as food and pharmaceuticals that require zero leakage. Its pressure bearing capacity is<=4 . 0MPA, lämplig för högtrycksarbetsförhållanden.
Double eccentric butterfly valve: The valve shaft deviates from the center of the butterfly plate and the center of the valve body at the same time. When the butterfly plate is opened, it is completely separated from the valve seat, and the friction is almost zero. It is suitable for high temperature (<=425℃) and high pressure conditions, such as high temperature steam pipelines in petrochemical and metallurgical industries. Typical applications include metallurgical blast furnace gas pipelines and power boiler bypass systems. Triple eccentric butterfly valve: On the basis of double eccentricity, the sealing surface is tilted at a certain angle to achieve zero leakage hard sealing. It is suitable for high pressure (<=25MPa) and high temperature (-196℃~700℃) conditions, such as LNG cryogenic storage tanks and nuclear power plant main steam pipelines. Its adjustment ratio is as high as 100:1, which is suitable for precise flow control.
