Variable displacement pumps are variable displacement pumps. The variable displacement pump may be a single-acting vane pump, a radial piston pump or an axial piston pump, wherein the radial piston pump includes a piston eccentric type and a shaft eccentric type, and the axial piston type includes a swash plate type and a bevel type. Gear pumps and double-acting vane pumps are generally quantitative pumps.
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