The invention provides a method and a device for replacing a
pipe section or a valve on a
water supply pipeline without water stopping. The method comprises the following steps that pipeline
flange plates and a pipeline
cutting beveling
machine are installed on the two sides of the to-be-placed pipeline or the valve, a pipeline seal bin is installed, thus the to-be-placed pipeline or the valve is located in a lower seal bin body of the pipeline seal bin, the to-be-placed pipeline is
cut and beveled, and the replaced pipeline and the pipeline
cutting beveling
machine are taken out; and a connecting
pipe fitting is placed into an upper seal bin body, the two ends of the connecting
pipe fitting are connected with the pipeline
flange plates on the two sides of the pipeline correspondingly, continuous action of the connecting
pipe fitting and the pipeline
flange plates is kept, the pipeline seal bin is detached, and the two ends of the connecting
pipe fitting are fixed to the pipeline flange plates on the two sides correspondingly. With the adoption of the technical scheme, the partial pipe section or the valve is replaced without water stopping, and through the method, no opening is formed in the original
water supply pipeline and no damage is caused to other structures while uninterrupted
water supply is ensured.