The Alfa Laval LKC UltraPure hygienic non-return valve is purpose-built to protect high-purity process equipment from the contamination and pressure events that reverse flow causes. It operates as a self-acting check valve—the spring-loaded plug responds to differential pressure alone, with no external signal or actuator required. That simplicity is an engineering advantage: fewer components in the flow path mean fewer surfaces to clean, fewer potential leak points, and lower maintenance burden across the valve's service life.

How does guide disc alignment prevent valve plug drift?

Accurate, repeatable sealing depends on the plug meeting the seat squarely on every cycle. The LKC UltraPure achieves this through a guide disc with four legs that constrain the spring-loaded plug along its axial travel path, preventing lateral drift under turbulent or pulsating flow conditions. The o-ring seal on the plug closes cleanly against the seat each time the differential pressure drops below the threshold—no misalignment, no partial seating, and no bypassing of process fluid in the reverse direction. This construction detail is what separates a genuinely hygienic one-way valve from a commodity check valve adapted for sanitary service.

What internal surface finish options meet pharmaceutical hygienic design standards?

Product-wetted surfaces are available in two finish tiers: Ra < 0.8 µm (SF3) for general high-purity duty, and Ra < 0.5 µm (SF1) for applications where the tightest surface roughness specification is a validation requirement. Both finishes are applied to the 1.4404 (316L) stainless steel body components—the alloy specified acc. to EN 10088—which provides the corrosion resistance and material purity that pharmaceutical and biotech processes demand. Non-product-wetted steel parts are 1.4301 (304) stainless steel. The two-part valve body is assembled with a clamp ring and hygienically sealed with a dedicated seal ring, so internal surfaces remain accessible for inspection and cleaning.

EPDM or FPM—which elastomer suits your process conditions?

Elastomer selection is the most process-specific decision in specifying the LKC UltraPure. EPDM is the standard choice for aqueous process media—it operates across a temperature range of -10 °C to 140 °C and carries both FDA and USP Class VI compliance, making it the default for pharmaceutical and biotech fluid paths. FPM extends the upper temperature limit to 180 °C and is the correct selection for processes involving aggressive media or elevated-temperature SIP cycles where EPDM would degrade—though FPM carries FDA compliance rather than USP Class VI. Both elastomers are available at the time of ordering to match specific chemical and thermal requirements.

What are the pressure and temperature limits of the LKC UltraPure?

The valve is rated to a maximum inlet pressure of 1000 kPa (10 bar). Temperature limits depend on elastomer selection: EPDM operates from -10 °C to 140 °C, while FPM extends that ceiling to 180 °C—accommodating both ambient-temperature product transfer and elevated-temperature CIP or SIP service. Pressure drop performance across all six standard configurations—DN25 through DN100, with corresponding ISO tube sizes from ISO25 to ISO101.6—is characterised per VDI 2173 measurement methodology using water at 20 °C.