Carstick cartridges by Parker Legris ensure safety

Carstick Cartridges from Parker Legris Ensure Safety

Carstick cartridges from Parker Legris are modular press-fit solutions for fast, secure connections in pneumatic and fluid systems. The design as a press-fit cartridge combines a compact control and sealing unit with various quick-fitting heads, allowing direct installation into housings or fittings without additional screw connections. This reduces installation effort, leakage risk, and maintenance time in industrial plants, mechanical and plant engineering, and mobile applications.

Materials and Designs

Carstick cartridges are available in polymeric and metallic materials, tailored to the medium, temperature range, and mechanical stress. Polymeric materials such as polyamide (PA6/PA66), POM (polyoxymethylene), or technical plastic composites offer corrosion resistance, low tendency to leak with abrasive media, and low thermal conductivity. Metallic variants typically consist of brass (CuZn alloys) or stainless steel (1.4301/1.4404) for increased mechanical strength, pressure and temperature reserves, and suitability for aggressive media. Surfaces are offered nickel-plated, chrome-plated, or natural, depending on the application. Common designs cover cylindrical press-fit dimensions in various lengths and diameters, modular head plates for multiple connections, and versions with flange or flush mounting. Carstick cartridges can be supplied as a completely pre-assembled unit or as an insert without a quick fitting to use customer-specific head plates or special connections.

Connections, Seals, and Configurations

The combination with quick fittings allows tool-free hose or tube connection. Quick fittings are available in straight, angled (45°, 90°), and swivel variants and fit standard hoses as well as push-in systems. Seals within the cartridges use specified elastomers: NBR (acrylonitrile-butadiene rubber) for general compressed air and oil applications, FKM (Viton) for higher temperature and chemical resistance, EPDM for water and steam applications, and PTFE sealing layers in special cases with aggressive media. The selection of sealing materials significantly determines resistance to hydraulic oils, coolants, solvents, and cleaning chemicals. Technical connection data includes common nominal sizes from M5, 1/8", 1/4", 3/8" to 1/2" BSP/NPT and metric threads, as well as push-in interfaces for outer diameters of 4, 6, 8, 10 mm hoses. Operating pressures typically range between 0 and 16 bar (for compressed air) depending on the version and can be designed significantly higher for special metallic variants. Temperature ranges vary with material: polymeric cartridges often from -20 °C to +80 °C, with FKM seals up to +150 °C, and stainless steel construction for higher peaks.

Functional Features and Performance Indicators

Carstick cartridges are designed for minimal dead volumes and low pressure losses. The flow cross-sections are optimized to reduce pressure drop at nominal flows and prevent cavitation in liquids. Mechanical locking rings and O-ring seats ensure repeatable sealing during repeated connection/disconnection cycles. In special variants, integrated shut-off valves are possible, allowing pressure-free disconnection of the line. Inserts with check valve function prevent media backflow during system downtime. For safety-relevant applications, cartridge types with certifications and material conformities are available. Documentation includes material safety data, test reports for leak tightness and continuous load, and lifetime data for repeated connection cycles.

Areas of Application

Carstick cartridges are designed for industrial compressed air distribution, pneumatic controls, cooling circuits, transport lines for lubricants, brake and hydraulic sample connections, and process water lines. Polymer versions are preferred in building technology, packaging machines, and food-related areas where media-compatible plastics are required. Metallic cartridges are used in the metalworking industry, automotive test benches, and chemical processes where high pressures, temperature, or chemical resistance are necessary. In automation, Carstick cartridges reduce installation time for modular machines, as pre-assembled units can be quickly pressed into control cabinets or machine frames.

Practical Examples

Practical Example 1 — Installation of a Quick-Fitting Cartridge in a Control Cabinet Unit: A packaging machine manufacturer uses Carstick press-fit cartridges with PA6 housing and NBR seals for pneumatic control. The cartridge is pressed into a pre-drilled hole in the machine frame. A 6 mm pneumatic hose is connected via a push-in quick fitting. Result: Reduced assembly time by 40% compared to screw connections, no leaks after 12 months of service operation. Practical Example 2 — Replacement of a Metallic Cartridge in a Cooling Water Line: In a CNC machine, a 1/4" brass Carstick cartridge with FKM seal was installed to simplify the connection of the cooling lubricant circuit. The cartridge integrated a check valve, so no coolant leaked during removal. Pressure tests confirmed 0 leakage under 10 bar. The metallic version extended the service life compared to the previous plastic part. Practical Example 3 — Retrofit in Food Processing: An operator replaced old screw connections with Carstick cartridges made of POM with EPDM seals to shorten cleaning intervals. The cartridges are temperature-resistant for CIP processes up to 80 °C and allow tool-free hose changes during maintenance without opening the system.

Selection Criteria and Installation Instructions

The selection of a Carstick cartridge is based on the medium (compressed air, water, oil, solvents), operating pressure, temperature, connection size, and fitting type. Check material compatibility between the medium and the sealing material, especially with additives and biological supplements. For installation, the press-in depth is crucial: Use calibration tools or press-in devices to avoid axial play. Pay attention to the alignment of the fitting head for angled variants to minimize kinking stress on the hose. Before commissioning, leak tests at system pressure and, if necessary, a long-term test under temperature load must be carried out. For high-pressure applications, the use of metallic cartridges with a suitable retaining plate is recommended. For technical references, installation instructions, and further product data sheets, please refer to our technical page https://maku-industrie.de/technik and to specific practical applications at https://maku-industrie.de/anwendungsbeispiele.

Compatibility and Spare Parts

Carstick systems are designed so that heads and press-fit bodies are often modularly interchangeable. For repairs, O-ring sets, locking springs, and push-in sleeves are kept as spare parts. For retrofitting, it is recommended to measure the press-fit bore and the mounting flange to select the appropriate cartridge. Manufacturer specifications for thread, locking mechanism, and nominal size must be matched with existing dimensions to avoid loss of function or leaks.

FAQ

* Which sealing materials are suitable for compressed air and coolants? NBR is standard for compressed air and many oils, EPDM for water/CIP processes, FKM (Viton) for high temperatures and chemical stress; PTFE components for aggressive media. How do I choose the right connection size? Measure the inner diameter and wall thickness of the hose or check existing threads (M5, 1/8", 1/4" etc.). Orient yourself by nominal size and flow requirements: too small nominal sizes increase pressure loss, too large ones impair the connection mechanism. What tests are necessary before commissioning? Leak tightness test at operating pressure, leakage measurement, function test of the connection/shut-off mechanism, and temperature test in the intended application area. Documentation of test results and material conformity is required for safety-critical applications.