... longer service life and low friction coefficient.3.Unibody design ,double acting and single acting ... 7.All fasteners are made of stainless steel ,to enable long-term corrosion resistance. ... three-piece ball valveModel : ZTQ61(6,8,2)F (N, P, H, Y )Bore: DN10-100mmPressure: 1.6, 2.5 ... )Control: Switch , Adjust .Selection of Accessories: solenoid valve, locator, limit switch, F.R..L. Combination unit ...