Water resistance apparatus, pumping system, pumping machine, and cleaning method

A water resistance apparatus for an oil cylinder, the oil cylinder comprises a press cover and a piston rod passing within the press cover, wherein the water resistance apparatus comprises:

• a fluid inlet, arranged in the press cover;
• a fluid outlet, arranged in the press cover, wherein the fluid outlet and the fluid inlet are in a staggered arrangement;
• a seal assembly, arranged between the press cover and the piston rod;
• a fluid input assembly, which is connected with the fluid inlet;
• and
• a fluid output assembly, which is connected with the fluid outlet;
• wherein a ring-shaped pressure accommodating cavity is formed among the seal assembly, the press cover and the piston rod;
• both the fluid inlet and the fluid outlet are connected with the ring-shaped pressure accommodating cavity;
• the fluid input assembly is used to supply a pressure oil for the ring-shaped pressure accommodating cavity;
• and the fluid output assembly is used to control a connection or disconnection of the ring-shaped pressure accommodating cavity with the outside world;
• wherein the fluid input assembly comprises:
• an oil storage device;
• a fluid-supply pipeline, wherein an end of the fluid-supply pipeline is connected with the fluid inlet, and the other end of the fluid-supply pipeline is connected to the oil storage device;
• and
• a fluid-control valve group, wherein the fluid-control valve group is arranged in the fluid-supply pipeline and used for adjusting a fluid-supply pressure of the fluid-supply pipeline;
• wherein the fluid-control valve group comprises:
• a reversing valve, wherein the reversing valve comprises a first connecting interface, a second connecting interface and a third connecting interface, and the reversing valve is connected to the fluid-supply pipeline via the first connecting interface and the second connecting interface;
• a connecting pipeline, wherein an end of the connecting pipeline is connected with the third connecting interface, the other end of the connecting pipeline is connected with the fluid-supply pipeline to form a connecting point, and the connecting point is positioned between the reversing valve and the fluid inlet;
• and
• a first pressure-reducing valve, wherein the first pressure-reducing valve is arranged in the fluid-supply pipeline, and is positioned between the second connecting interface and the connecting point.