Compact design, low noise level, ease of oil check and refill and simplified maintenance operation, are the main features of LC 40 and LC 60 lubricated rotary vane vacuum pumps. The damping and recovery system, equipped with a by-pass, together with the new float type oil recovery valve, ensures the absence of oil vapors at the outlet. Moreover, a sealing device prevents the oil from being sucked back should the pump stops under vacuum. Only hazardous parts have been housed in order to improve both the cooling and the appearance of the pumps