[Inadequate gas supply to the patients after the repair of anesthesia delivery system].

We experienced inadequate gas supply to the patients from the breathing circuit of anesthesia delivery system with APL valve at full open position. It was hardly noticed after the check-up before starting work with anesthesia delivery system. This problem was caused by the mistake in installing the one-way valve when the repair of anesthesia delivery system was done. In addition to the check-up before starting work, we should check whether gas comes out from the breathing circuit.