Gold and Diamond Series: Selecting a Telescopic Cylinder According to Application Requirements

One of the most frequently asked questions when selecting a telescopic cylinder is whether the Gold or Diamond series should be preferred. These two options are often treated as though they were competing levels of quality. HMLIFT product engineering, however, is not designed to make one series superior to the other; it is designed to provide the optimum response to different application profiles and technical requirements.

Rather than being simple alternatives to one another, the Gold and Diamond series are engineering solutions for different operating conditions. Selecting the correct series begins not with the question “Which one is better?” but with an analysis of “What do the application’s technical parameters require?” This analysis is critical to the system’s long-term operational efficiency and technical compatibility.

HMLIFT Telescopic Cylinder Family

The HMLIFT telescopic cylinder range consists of principal series developed to address the varying needs of global markets. Each series is designed around specific technical parameters and operating dynamics:

• Classic Series (42… Code Group): Recognised by its grey colour, it offers solutions optimised for nominal/maximum operating pressures of 170/190 bar.
• Gold Series (43… Code Group): Identified by its gold/bronze colour, this series offers performance and durability within the 170/190 bar pressure range.
• Diamond Series (45… Code Group): Distinguished by its black colour, this series is configured for high-pressure conditions with a 250 bar capacity and hard-chrome surface technology.

Shared Engineering Foundation

All these series share a high-standard manufacturing platform: ST 52 cold-drawn tube architecture, precision hard-chrome plating on the stages, a broad diameter range from 116 to 245 mm, options from 3 to 7 stages and stroke lengths from 2,470 to 8,675 mm are all part of this common structure.

Operating Temperature and Climate Capability

The standard operating temperature range of HMLIFT telescopic cylinders is -40°C to +80°C. For regions dominated by extremely low temperatures, such as Russia and Northern Europe, special sealing and material configurations suitable for operation down to -40°C are available. These configurations are determined by the technical team according to the climate in which the project will operate. While this flexibility in the base structure is retained, the principal differentiation between the series begins with the application’s specific pressure and surface-durability requirements.

Pressure Capacity and Surface Technology

Pressure capacity and the surface-treatment approach are among the clearest technical parameters distinguishing the Diamond series from the other series. The Gold and Classic series provide system balance at standards of 170 bar nominal and 190 bar maximum operating pressure, while the Diamond series is designed to meet hydraulic requirements at the 250 bar level.

The hard-chrome plating technology used in this series offers high standards of wear resistance and surface hardness. Advanced coating thickness and optimised surface roughness support the service life of sealing elements and the long-term behaviour of stage surfaces in systems operating under high pressure. The 250 bar capacity provides a mechanical foundation for the pressure assurance that may be required in severe field conditions.

Principal Parameters Affecting Series Selection

The series or configuration suitable for a project becomes clear after the application’s technical profile is examined. The following parameters are particularly important:

• System Pressure Profile: The system’s nominal operating pressure and instantaneous peak values determine the required structural strength.
• Lifting Geometry and Angle: As the cylinder approaches full extension, the force distribution and pressure profile within the system change. The lifting angle directly influences this change.
• Cycle Density: The system’s daily operating frequency is an operational input that affects the long-term behaviour of the chrome coating and sealing elements.
• Environmental and Climatic Conditions: Extreme cold or high desert temperatures affect hydraulic-oil viscosity and seal flexibility and must therefore be considered when selecting the configuration.
• Nature of the Transported Material: Lifting loads with different specific weights at the same volume directly changes the hydraulic force and pressure limits required by the system.

Conclusion: An Engineering-Led Decision Process

It is more accurate to view the HMLIFT telescopic cylinder series as a horizontal range of applications rather than as a vertical quality ranking. Each series is optimised to provide the most reliable performance under a defined set of technical parameters.

The correct configuration is the one that optimally meets the needs of the project, geography and mechanical design. Taking a holistic approach to this assessment contributes to long-term system reliability and operational continuity. Contacting the HMLIFT technical team to verify the parameters is always an appropriate way to confirm the configuration best suited to the project requirements.