The utility model provides a S pipe assembly, pumping installations's distribution valve mechanism and pumping installations. Wherein, the S pipe assembly includes: the S pipe, the S pipe has first port, the cutting ring, the cutting ring sets up on first port, be used for adjusting the axial position of cutting ring on the S pipe elastic element, set up between cutting ring and first port, be provided with the angle modulation structure between the cutting ring sum S pipe to make the cutting ring angularly adjustable soil preparation set up on first port. Through the utility model provides a technical scheme can solve the problem that cutting ring and glasses board among the prior art can't be laminated completely.