Rubbing dregs amount of bleaching and PTFE seat surface seen in the main diaphragm and the center diaphragm, equal to or less than compared with our standard valve (VD type integral diaphragm valve).
The seat surface and PTFE albinism abrasion amount in the center of the diaphragm and the diaphragm, and the main valve (with our standard VD type diaphragm valve is equal to or less than). At