Abstract: An adjustable pressure gauged switch for electric valve-less pumps, including a block, a switch, a pressure reaction module, a base and a pressure gauge, wherein the block is able to contain the pressure reaction module. A switch is connected to a lower end of the block, and the base is connected to a rear end of the block. The pressure reaction module is used to adjust setting fluid pressure passing through the base, thereby activate or deactivate a microswitch. A check valve is configured interior of the base close to a passage inlet end, which is able to prevent backflow of fluid passing through the base inlet causing a pressure drop and restarting the microswitch.

Abstract: A pump with variant strokes has a body, a piston assembly and a decelerating member. The body and the decelerating member are respectively mounted adjacent to the piston assembly. A holder is mounted in the piston assembly and has multiple openings. When the decelerating member is driven to rotate and engages one of the openings in the holder, the piston assembly can move back and forth. Adjusting the decelerating member to connect to different one of the openings of the holder to form different rotating diameters can adjust the strokes of the present invention to provide different pressure and flow capacity.

Abstract: A needle and cover device is mounted detachably on a barrel with a plunger to form a safety syringe and has a needle member and a cover member. The needle member is mounted on the barrel and has a needle hub and a needle. The needle hub has a cylinder, multiple spokes and a needle mount. The spokes are formed on the cylinder and each spoke has a locking recess. The needle is mounted on the needle mount. The cover member is capable of locking and holding the needle member and has a locking ring and a cover. The locking ring has multiple locking protrusions formed on the locking ring and selectively engaged respectively with the locking recesses in the needle hub. When the cover member locks the needle member, pulling the cover member detaches the needle member from the barrel.

Abstract: A pump with variant strokes has a body, a piston assembly and a decelerating member. The body and the decelerating member are respectively mounted adjacent to the piston assembly. A holder is mounted in the piston assembly and has multiple openings. When the decelerating member is driven to rotate and engages one of the openings in the holder, the piston assembly can move back and forth. Adjusting the decelerating member to connect to different one of the openings of the holder to form different rotating diameters can adjust the strokes of the present invention to provide different pressure and flow capacity.