lever valve / for acids / for solvents / flange
for acids, for solvents
for the chemical industry, heating, process
Transfer molding is a type of molding method that evolved from compression molding; It includes heating and cross linking process which are conducted in two separate locations. Transfer molding begins by melting the plastic material as PFA (Polyfluoroalkoxy / fluoroplymers) in the separation chamber, then injects the material into another sealed mold for it to take shape and harden. When the component being shaped has a complex shape or insert(s), the use of compression molding may damage the component or shift the insert(s). Those possible difficulties can be avoided by choosing transfer molding over compression molding. The equipments of transfer molding can be separated into two categories: pot transfer and plunger molding.
►Features of Transer Molding PFA Liner
The firm PFA liner is produced by a combination of transfer molding and a special variation of injection molding. This processing method prevents pinholes, cracks, swelling, degradation, and ablation. The Dovetail design enables PFA liner to firmly attach to the valve body, preventing possible peeling, distortion, and shifting.
Double sealing valve body design. Protection provided by soft sealing and metal sealing prevents leakage caused by aging and degradation of the PFA liner. The metal sealing also provides reinforcement to the metal structure and corrects flange distance orientation.
Excellent chemical resistence. The entire internal surface of the valve is covered by 2.5mm to 3mm thick PFA liner, which prevents corrosion and permeation from chemicals, solvents, and other acids or alkali.