Liquifit ball valves by Parker Legris in onlineshop

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

Liquifit ball valves are specially developed shut-off valves made from chemically neutral polymer material, used in applications with high demands on hygiene, cleanability, and material compatibility. Their design prevents contamination, offers low dead spaces, and allows for quick, tight shut-off in process, cleaning, and supply lines. Typical areas of application include drinking water systems, beverage production, laboratories, and food processing areas where metallic materials or aggressive sealing materials are excluded.

Design Principle and Materials

Liquifit ball valves are based on a lightweight, corrosion-resistant polymer housing with a precision-machined ball made from the same or a compatible plastic. The polymers used are formulated to be chemically neutral to water and common food chemicals, and do not release relevant substances into the medium. Sealing functions are often achieved by elastomeric seat rings; depending on the model, EPDM is used for good weather and steam resistance, or FKM (Viton) for higher temperature and oil contact. Optionally, PTFE-integrated seats are available for very low friction and high chemical resistance. The housing, stem, and ball are designed so that the surface roughness meets the requirements for hygienic processes, minimizing deposits and shortening cleaning cycles.

Tightness, Pressure, and Temperature Ranges

Liquifit ball valves achieve reliable tightness against liquid media through precise seat geometry and suitable elastomers. Typical pressure ratings are in the low to medium range of industrial process lines (0.5 to 10 bar, depending on the model). The approved temperature ranges depend on the housing and sealing material; polymer-based Liquifit variants are usually designed for use at low to moderate temperatures, making them ideal for drinking water, carbonated beverages, and cold to lukewarm process streams. For applications with higher temperatures, specific material specifications should be observed. If required, we can assist in selecting the correct model for pressure and temperature requirements.

Connections and Installation Dimensions

Liquifit ball valves are available in various connection types to facilitate direct integration into existing piping systems. Common connection types include internal and external threads (BSP/NPT), hose barbs for flexible piping systems, and hygienic Tri-Clamp or process connections for CIP-capable systems. The compact design allows for short installation lengths and reduces dead volume in the line. When selecting the connection, material compatibility and seal type must be considered to ensure cleanability and tightness over long operating periods.

Cleaning, Maintenance, and Service Life

Liquifit series designs allow for simple, low-tool maintenance: removable stem covers, accessible seat rings, and replaceable sealing components reduce downtime. The smooth surfaces and minimal dead spaces facilitate CIP (Cleaning in Place) and SIP (Sterilize in Place). Cleaning-resistant elastomers like EPDM allow for regular disinfection with common cleaning agents, while PTFE components offer mechanical abrasion resistance and reduced residue adhesion. Service life depends on the medium, temperature, load cycles, and cleaning chemistry; in practice, polymer ball valves, when correctly selected, are economically viable long-term compared to sensitive metal designs in corrosive or hygienically sensitive environments.

Compatible Media and Incompatibilities

Liquifit ball valves are optimized for water, drinking water, beverages including carbonated products, many food additives, buffer solutions, and non-aggressive chemicals. The following overview shows typical media and notes on suitability:

• Water, drinking water, beverages: suitable; high cleanability and chemical neutrality

For strong organic solvents, aggressive acids/bases in high concentration, or temperatures above the recommended operating limits, metallic or specially designed material combinations should be chosen. In case of doubt, check the chemical resistance of the polymer and sealing materials used or contact the manufacturer for a compatibility check.

Standards, Compliance, and Food Law

Liquifit ball valves are designed for applications with direct or indirect food contact. Material selection and production processes are guided by common requirements of the food and beverage industry. For specific regulatory requirements (e.g., EU food contact regulations, NSF/FDA certifications), the respective data sheets and certificates for each model type should be consulted. Use the technical documentation on the product page and supplementary information under Technik for more in-depth information.

Practical Examples

1) In a beverage filling line, a Liquifit ball valve is installed as a shut-off valve on a water supply and diversion line. The compact design allows installation close to the filling station; during CIP cycles, the ball valve is briefly flushed in the open position, and the seat geometry and smooth internal surfaces prevent foaming and deposits. The use of EPDM seals allows regular disinfection with chlorine-containing agents without significant wear.

2) In a laboratory supply network, a Liquifit ball valve regulates the supply of purified process water to individual test stations. The polymeric materials prevent metallic interactions with sensitive measuring reagents and simplify assembly thanks to slim installation dimensions and threaded connections.

3) In a dairy, a Liquifit ball valve is used in a secondary piping system that carries whey liquids at low temperatures. Tri-Clamp variants allow hygienic disassembly for inspection and quick replacement of seat rings. The small dead space reduces the risk of microbial contamination.

Further specific application cases and installation examples can be found under Anwendungsbeispiele.

Selection Criteria and Ordering Information

Select Liquifit ball valves based on the following criteria: medium and chemical composition, operating temperature, maximum operating pressure, desired connection type, necessary hygiene standards, and cleaning and disinfection cycles. When ordering, pay attention to the exact article designation regarding seal type and connection variant. In case of uncertainty, a description of requirements including temperature, pressure, and medium data is recommended for quick consultation and suitable product recommendation.

Integration into System Technology and Automation

Liquifit ball valves can be integrated into pneumatic or manually controlled systems. For automated systems, models with actuator mounts or adapters for position actuators are available. The low inertia of polymer balls reduces switching time, but the compatibility of actuator and stem must be checked to ensure long-term stable operation and tightness. Pay attention to suitable torque values and correct assembly to avoid damage to seat rings.

Economic Efficiency and Environmental Aspects

Polymer ball valves of the Liquifit series offer cost advantages due to low weight, reduced susceptibility to corrosion, and easy assembly. Longer maintenance intervals and replaceable seals reduce overall costs. Environmental aspects arise from material selection and recyclability; many components are thermoplastic and can be disposed of separately or recycled. For specific disposal requirements, product information provides details on material markings.

Frequently Asked Questions (FAQ)

1. For which media are Liquifit ball valves unconditionally suitable?

Liquifit ball valves are designed for water, drinking water, and a variety of beverages, as well as for many food and laboratory liquids. For aggressive chemicals or high temperatures, please check the specific material and sealing specifications of the respective model.

2. Can Liquifit ball valves be integrated into CIP/SIP processes?

Yes. The design with smooth internal surfaces and minimal dead volume is suitable for CIP and, in many cases, SIP processes. Suitability depends on temperature and chemical use; select seals and model according to cleaning parameters.

3. Which connection options and sealing materials are available?

Common connections include BSP/NPT threads, hose barbs, and hygienic Tri-Clamp connections. Sealing materials include EPDM for good cleaning and steam compatibility, FKM for higher temperature/oil resistance, and PTFE elements for chemical resistance and low friction. The exact combination is model-dependent and should be selected based on operating data.