Bidirectional non-return diaphragm pump with expansion pressure relief structure and operation method of bidirectional non-return diaphragm pump

The invention relates to a two-way non-return diaphragm pump with an expansion pressure relief structure and an operation method of the two-way non-return diaphragm pump. A non-return seat of the diaphragm pump is provided with a liquid return hole opposite to a drainage runner and a water inlet cavity, a liquid return pipe extending into the water inlet cavity is formed in the circumferential direction of the liquid return hole, and a pressure relief sleeve arranged on the liquid return pipe in a sleeving mode is formed on a lower sealing gasket; according to the technical scheme, additional accessories do not need to be additionally arranged, a pressure relief structure is additionally arranged, then the production cost can be greatly optimized, meanwhile, the assembly process is not changed, the production efficiency is improved, the production cost is reduced, and the production cost is reduced. Increasing of complexity and difficulty of the assembly process can be avoided. 本发明涉及一种具有膨胀泄压结构的双向止逆隔膜泵及其运行方法，隔