Plastic butterfly valve connection issues
Thread Content
Are there butterfly valves made of pure plastic (with a polypropylene housing and PTFE seals) that come with flange connections? Are they all only butt-welded? Please give me some advice.
Refer to: GB/T 26144 Flanged and wafer-mounted steel fluoroplastic butterfly valves; however, they are generally of the wafer-mounted type.
Flanges can be purchased, but there are relatively few manufacturers； Most of them are clamped ； Just add a note when placing the order
Hello, have you bought it before? Are there any recommended manufacturers?
For those with flanges, an F4 lining is sufficient. Using PTFE for the gasket is also fine
They are usually wafer-type; the wafer-type plastic butterfly valves have flange holes, as shown in the diagram. However, plastic butterfly valves generally use rubber seals, as it is difficult to line them with PTFE from a manufacturing perspective. There are also those with PTFE seals, and they usually have an eccentric structure. If the medium in use is corrosive to EPDM and fluororubber, and PTFE seals are necessary, then ball valves or diaphragm valves could be considered alternatives. The maximum standard size is generally DN300. You can tell me the medium conditions and specifications, and I’ll help you select the right one.