Hydraulic cylinders

Intended for a wide range of industrial applications, the tie-rod standard cylinders are designed and built to satisfy the most demanding operating conditions, with durable and efficient performances, minimum maintenance and utmost output. Thanks to the attention paid to the design and choice of materials and seals used, construction with high quality and accuracy standards, combined to a severe final test that reproduces the typical operating conditions of the cylinder, these hydraulic actuators are a valid choice for any type of application where utmost reliability, repeatability and high dynamic characteristics are required.

CMI provides its technical and design staff for special executions according to specific requirements. Special anchoring, non-standard boring or stem sizes, alternative sealing systems and non-standard options, such as control (servo-cylinders) and sealing modules (safety solutions in compliance with the machine Directive) installed directly on the actuator, are only some of the customisation options offered by our company.

General characteristics

The building components are assembled by means of tie-rods in high-resistance tempered steel, the sleeve inside of which the piston slides, is entirely polished in order to minimize friction coefficients, reducing the seals wear and maximizing the sealing performances.

The stem is made in steel C45 with chrome appliqué or, upon request, in chromed steel 42CrMo4, tempered and chromed steel, stainless steel or ground, nitrided steel 41CrAlMo4.

Guide components are made in bronze and the piston is secured to the stem by means of a thread with adhesive finish, and locked by means of a safety dowel.

Sealing components

Particular focus is paid to sealing components, all the employed seals are of prime quality and optimised in order to minimize fluid leakage, maximizing static sealing, without compromising the overall performances and dynamics of the actuator.

The various combinations include seals in polyurethane, PTFE and VITON + PTFE.

Ad-hoc sealing solutions can be studied upon request, for particular actuating needs of the customer..

Dimensional inter-exchangeability

Cylinders comply with ISO 6020/2 (1991) and DIN 24554 standard, therefore they can be inter-exchanged with reference standard cylinders.

They can be designed and built upon request, to respond to the customer’s specific dimensional needs..

Size range

• Boring from Ø25mm to Ø200mm
• Stem from Ø12mm to Ø140mm
• Available with any practical operating travel.

Fifteen different types of standard anchoring, up to three stem sizes and male or female threads according to boring size.

Intermediate anchoring and edge supports for cylinders with fixed type assembly and travel exceeding 1000 mm, supports for tie-rods, travel stops.

Connection inlets

Standard BSPP connection inlets with support surface, without spot faced surface.
Possibility to manufacture non-standard connection inlets based on the customer’s needs.
Four possible alternative positions for supply inlets, also applicable to air exhaust vents and damper adjustments.

Operating limits

• Nominal operating pressure (constant operation): 160 Bar (16MPa).
• Nominal operating pressure (intermittent operation): 210 Bar (21MPa).
• Actuating speed up to 0.5 m/sec with standard seals, 15 m/sec with PTFE seals.
• Operating temperature: from -20°C to +150°C according to the fluid and type of seals used