... the pumpbody,the air supply,exhaust system,and one-way valve.It's a use of air pressure to ... is only part of the diaphragm and check valve in the valve ball,so the maintenance,inspection is very ... single diaphragm pump ODS series,pump and check valve of the body of cast iron,lined with rubber ... components,so that the failure rate significantly reduced. 3.There is no rotating parts,so in the course ...