1, the principle of action is different
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Two-way acting shock absorber refers to two cylinders inside and outside the shock absorber, the piston moves in the inner cylinder, due to the entry and withdrawal of the piston rod, the volume of the oil in the inner cylinder increases and shrinks, so the balance of the oil in the inner cylinder must be maintained by exchanging with the outer cylinder.
The unidirectional acting shock absorber is equipped with a floating piston in the lower part of the cylinder, (the so-called floating means that there is no piston rod to control its movement), and a closed air chamber is formed under the floating piston and filled with high-pressure nitrogen.
2. Different structures
Two-way acting shock absorber has two inner and outer cylinders.
The unidirectional acting shock absorber has only one cylinder.