How hydraulic door closers work？

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https://www.aleader-china.com/
Hydraulic door closer hinge, anti pinch and prevent door slams.hydraulic self closing frameless glass hinge pool gate.
Aleader Machinery is a modern and professional manufacturer and exporter dedicated to research, development, production, sales and service of investment castings including construction hardware, auto parts, pump & valve parts, impellers, marine hardware, and some other machinery parts in materials of stainless steel, carbon steel, alloy steel, and brass, etc.
We can supply castings in different conditions including heat-treated, precision-machined, and with some special surface treatments such as spray paint, electric or mirror-polish, satin, vibration grinding, galvanization, and nickel plating, etc. Our products are extensively used in the fields of construction industry, chemical machinery.