Liquifit ball valves by Parker Legris in onlineshop

Liquifit Ball Valves from Parker Legris: Hygienic Shut-off Technology for Water and Food Applications

Liquifit ball valves from Parker Legris are designed for applications where hygiene, chemical neutrality, and easy cleanability are central. The series utilizes technically proven, food-grade polymers and sealing concepts that guarantee a secure seal against leakage and a low dead space volume. Typical fields of application include drinking water installations, beverage production, CIP/SIP processes, and laboratory or medical technology, where freedom from contamination and residue-free cleaning are required.

Materials and Material Properties

The use of chemically neutral polymers as the main material reduces interactions with product media and minimizes particle release. The housing and ball are made of high-purity, additive-free plastic, certified for contact with water and food. Options with stainless steel cores or metallic sealing surfaces are available when increased mechanical strength or temperature resistance is required. Seals are offered as standard in FDA-compliant elastomers such as EPDM or FKM; EPDM is particularly suitable for hot/warm water applications and alcohol-containing media, FKM for heat and oil-resistant requirements. Materials are chosen so that neither odor nor taste is transferred to the product.

Designs, Actuation, and Installation

Liquifit ball valves are available in several designs: inline versions for pipelines, angle valves for confined installation situations, and compact three-way variants for switching functions. Actuation types include manual handles, levers with locking mechanisms, and pneumatic as well as electric actuators for automation tasks. Connections are available as compression fitting, push-in, or threaded variants; special hygienic clamp and Tri-Clamp connections simplify installation in piping systems and reduce dead spaces. Compact flange adapters are available for easy retrofitting. The compact design reduces installation length and facilitates thermal cleaning.

Seals, Dead Space, and Cleanability

The sealing technology of the Liquifit series focuses on minimal dead space and complete cleanability. The ball and seat are shaped to prevent product residues from remaining in pockets. Double O-ring lip seals and replaceable seat rings allow for maintenance without special tools. The smooth surfaces of the flow channels are designed for low roughness to prevent biofilm formation and accelerate CIP/SIP processes. Temperatures for CIP cleaning and steam sterilization are specified depending on the model; for applications with steam sterilization, specially designated versions with temperature-stable elastomers should be chosen.

Media, Pressure, and Temperature Ranges

Liquifit ball valves are primarily optimized for water, beverages, liquid foods, and neutral solvents. Pressure and temperature ratings vary depending on the material configuration and connection type; standard versions typically cover operating pressures up to several bar and temperatures up to 90 °C. Variants with metallic reinforcements or special seals extend the permissible temperature and pressure range. For aggressive media or very high temperature cycles, material selection should be coordinated based on the specific medium and process conditions.

Connection Types and Installation Guidelines

For hygienic piping systems, clamp/Tri-Clamp connections are the preferred choice, as they allow for process-safe sealing and quick disassembly. Threaded connections are suitable for supply lines outside the product-contacting zone. Push-in or quick couplings are advantageous in modular systems and laboratory equipment. During installation, ensure correct alignment of the seal and complete tightening of the fittings to ensure compression and a tight fit. For pneumatically or electrically operated variants, necessary service clearances and actuation connections must be considered. Detailed installation instructions and CAD data are available via product specifications.

Practical Application Examples

Example 1 — Beverage Bottling, Pasteurization Line: A Liquifit ball valve in Tri-Clamp design controls the switching between filling and cleaning flow. During the CIP cycle, the smooth ball surface remains free of dead spaces, allowing the cleaning agent to be completely flushed through and discharged without residue. The EPDM seat ensures tightness even with temperature changes during pasteurization.

Example 2 — Laboratory and Analytical Setup: In an analytical sample preparation, a compact Liquifit ball valve regulates sample transfer to measuring instruments. The chemically neutral polymer design prevents interaction with trace analytical samples. The quick coupling allows tool-free removal and cleaning between sample runs, preventing cross-contamination.

Example 3 — Vending Machines and Water Dispensers: Liquifit ball valves with small volume and straight-through design reduce pressure losses in confined piping systems of machines. The smooth flow surfaces minimize scale and biofilm buildup, extending maintenance intervals and shortening cleaning cycles.

Selection Criteria and Specifications

The following criteria are crucial for product selection:

• Medium type and chemical resistance to determine the appropriate polymer and sealing material.
• Temperature and pressure requirements of the process to define the design and reinforcement.
• Connection type (Tri-Clamp, threaded, push-in) to match existing piping systems.
• Cleaning strategy (CIP/SIP) to select surface roughness and seat geometry.

Technical data sheets and material certificates of the Liquifit series provide precise information on approvals, temperature, and pressure limits. For further technical information and application examples, please visit our technical page and practical examples: Technology and Application Examples.

Maintenance, Spare Parts, and Service Life

Regular inspection of seat rings and O-rings extends service life. Replaceable seat rings and seal kits simplify repairs. Service life depends on chemical exposure, temperature cycles, and mechanical stress; with standard-compliant application, Liquifit ball valves offer a low-maintenance operating life. Spare parts and replacement kits are generally in stock and allow for quick on-site replacement without special tools.

Safety and Compliance Aspects

Liquifit ball valves comply with relevant food contact regulations and are supplied in selected versions with certificates for food contact. For applications in regulated areas such as pharmaceutical production, documented material proofs and test reports are available. Observe industry-specific validation requirements and document installation and maintenance steps for traceability.

Procurement and Integration Notes

When procuring, ensure complete specification including connection dimension, sealing material, approvals, and actuation type. For automation integration, electric or pneumatic actuators with interface data are available. CAD data and dimensions support planning in advance and reduce fitting effort. For individual requirements, Parker Legris offers variants or customized adaptations.

Conclusion

Liquifit ball valves combine hygienic materials, low dead spaces, and robust sealing solutions for water and food-related applications. The modular connection variety and the possibility of automation make them suitable for production lines, laboratory setups, and supply systems. Technical details, certificates, and specific application data can be found in the product data sheets and practical examples on our website.

FAQ

Which sealing materials are available for Liquifit ball valves and what should be considered when selecting?

Typically, EPDM and FKM (Viton) are available, as well as other FDA-compliant elastomers. EPDM is suitable for hot water and cleaning applications as well as for alcoholic media, FKM for higher temperatures and oil-containing media. Selection criteria are media chemistry, temperature range, and required sterilization capability.

Can a Liquifit ball valve be used in CIP and SIP processes?

Yes, many Liquifit variants are designed for CIP processes; for SIP/steam sterilization, specially designated versions with temperature-stable sealing materials are necessary. Surface roughness and dead space geometry are designed so that cleaning flows effectively reach all product-contacting surfaces.

Which connection type is recommended for hygienic piping systems?

For hygienic applications, clamp or Tri-Clamp connections are preferable because they offer easy disassembly, minimal dead spaces, and process-safe seals. Threads are suitable outside the product-contacting zone, push-in connections are practical for modular or laboratory-related systems.