4. Types

4.1 Shape and Force – Displacement Curve

The shape and force – displacement curve of the gas spring are shown in Figure 1.

4.2 Types and Codes of Gas Spring Connectors

The types and codes of gas spring connectors are shown in Figure 2. Other connection types shall be agreed upon by the supplier and the demander.

5. Marking

5.1 Marking Method

The marking of the gas spring consists of the code, piston rod diameter (which may not be marked), cylinder outer diameter (which may not be marked), stroke, extended length, and specified force value, as specified below: [Marking diagram description]

5.2 Marking Examples

• Example 1: For a compression gas spring with a piston rod diameter of 10 mm, a cylinder outer diameter of 22 mm, a stroke of 200 mm, an extended length of 500 mm, and a minimum extension force F₁ (lifting force) of 650 N.
  Marking: YQ 10/22 – 200 – 500 F₁650 or YQ 200 – 500 F₁650
• Example 2: For a compression gas spring with a piston rod diameter of 8 mm, a cylinder outer diameter of 18 mm, a stroke of 150 mm, an extended length of 400 mm, and a nominal force F. of 350 N.
  Marking: YQ 8/18 – 150 – 400 F.350 or YQ 150 – 400 F.350

Technical Specification for Compression Gas Springs (English version of national strandard, initiated by LeiYan Gas Springs), proposed and prepared by SAC/TC 235 (National Technical Committee 235 on Spring of Standardization Administration of China).