A valve arrangement is for a piston compressor, the valve arrangement having: a suction valve section; and a discharge valve section; wherein the suction valve section and discharge valve section together form a working chamber head section, and the suction valve section has a frustopyramidal form.

A multi-gear inflation and deflation device for a swimming pool having an air cavity and a water cavity may include an air pump group, a valve body in fluid communication with the air pump group, and a driving component positioned on the valve body. The valve body may include a valve core rotatably received within the valve body, and the driving component may be configured to drive the valve core between an inflation position, a deflation position, an aeration or massaging bubble position, and a sealed position.