Ceramic Piston and Spool Valve Material:ceramic Range of filling level: 0.2~500 ... creams, pastes, shampoo and make-up...*Others: ink, reagents, chemicals.Working principle:The Spool Valve is based on a balanced spool design to create ... beverage, dairy, wine, edible oilCosmetics:Perfumes, lotions creams, pastes, shampoo and make-up ect.Others:ink, reagents, chemicals. Ceramic Piston and Spool Valve