... and ROTEN-MSG have more than 60 years experience in the field of dry gas seal and mechanical seals. We are ... Yitong Sealing Co., Ltd. manufactures high quality dry gas seal and mechanical seals for pumps, mixers, agitators and compressors, covering applications ... :- Standard mechanical seals (John Crane, Burgmann, ROTEN)- OEM dry gas seal mechanical seals (Gundfos, APV, FRISTAM, Alfa-Laval, SIHI, ...