Double orifice air valve cast iron/ductile iron Flange acc. ... DN200 PN10/16 NBR OR EPDM BALL Double orifice air valvecast iron/ductile ironFlange acc. to DIN,BS, ... steel or stainless steel Dalian Wantong Industrial Equipment Co., Ltd. (WTIE) was established in 1992 as a sub-branch ... been well recognized for their high quality and considerate services.As a leading supplier of pipes, fittings, know- ...