What is the installation direction of the hydraulic cylinder seal ring?

1 Answers
PatrickMarie
07/30/25 1:28am
Hydraulic cylinder seal rings are installed in a counterclockwise direction. Below are relevant extended details: 1. During installation, both seals should face inward. Their function is to block the oil. The hydraulic cylinder piston typically has two oil seals installed back-to-back. When port A receives oil, the pressure oil enters the lip of the seal—the greater the pressure, the tighter the lip presses against the cylinder wall. The same applies to port B. The piston rod seal has two lips: the smaller lip faces the direction of the piston rod threads. The smaller lip serves two purposes: dust prevention and wiping off dust or debris from the piston rod. 2. Piston-type hydraulic cylinders can be divided into single-rod and double-rod structures, with fixing methods including cylinder body fixing and piston rod fixing. They can also be categorized as single-acting or double-acting based on hydraulic pressure application. 3. In single-acting hydraulic cylinders, pressure oil is supplied to only one chamber, enabling unidirectional movement via hydraulic pressure, while reverse movement relies on external forces (such as spring force, gravity, or external loads). In contrast, double-acting hydraulic cylinders achieve bidirectional piston movement by alternately supplying oil to both chambers via hydraulic pressure. 4. Only one side of the piston has a piston rod, resulting in different effective working areas in the two chambers. With the same oil supply volume, piston speed varies depending on which chamber receives oil. When overcoming the same load force, different oil supply pressures are required depending on the chamber receiving oil. Alternatively, after system pressure is set, the load forces that the hydraulic cylinder can overcome in both directions differ.
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