... -closed type. JYWL Sludge Oil Filtration Machine:Series JYWL horizontal-closed oil filtration machine is completely closed type and ... , also for the waste water. JYWL horizontal-closed oil filtration machine can separate pigment, bitumen, sludge, particles, wax, ... operation, live Bolt locks seal.JYWL horizontal-closed oil filtration machine realizes closed filtering operation, easy discharging residua, ...