Globe Valves for Food & Beverage

A sanitary (hygienic) globe valve and a standard industrial globe valve differ in design, materials, and certification in several important ways: (1) Body geometry: Sanitary globe valves have smooth, crevice-free, self-draining internal profiles with no pockets where product can accumulate between batches. Standard globe valves have practical internal geometries (glands, packing boxes, bonnet crevices) designed for durability, not cleanability. (2) Surface finish: Sanitary globe valves have electropolished SS 316L wetted surfaces to Ra ≤0.8 µm (ASME BPE SF1/SF3) — this limits bacterial adhesion and enables effective CIP cleaning. Standard valves are as-cast or machined to Ra 3.2–6.3 µm — unacceptable for food contact. (3) Connections: Sanitary globe valves use clamp (Tri-clamp/DIN 11851), bevel-seat, or butt-weld hygienic end connections — no threaded or flanged connections in product contact. Standard valves use flanged, threaded, or butt-weld industrial ends. (4) Certification: Sanitary globe valves carry 3-A Dairy, EHEDG, and/or ASME BPE certification — independently verified hygienic design. Standard valves are not designed to meet these certifications. (5) Stem seal: Sanitary valves use multiple steam-sterilisable stem seals (double-O-ring or lip seal with steam barrier) to prevent external contamination entering the process through the stem area.

Yes, globe valves are well-suited for CIP supply header throttling in dairy plants. In a CIP system, the cleaning solution supply is typically sent through the product circuits at a controlled velocity (minimum 1.5 m/s across the product piping to ensure turbulent flow for effective cleaning). A globe valve on the CIP supply or return header allows the operator to regulate flow and maintain target velocity as the cleaning circuit changes (different circuit lengths and resistance). Requirements for CIP service globe valves: (1) Material: SS 316L body — resistant to caustic (NaOH 2%, 80°C) and acid (HNO₃ 1%, 70°C) CIP phases; (2) Self-draining: Installed with stem vertical; no pooling of cleaning solution in body; (3) Surface finish: Ra ≤0.8 µm for all product-contact surfaces (even in CIP service, the valves are in contact with a circuit that touches product), though CIP-only headers (not product contact) can use Ra ≤1.6 µm; (4) End connections: Clamp or DIN 11851 connections for dairy applications; flanged SS 316L for larger industrial dairy operations. Diaphragm valves (hygienic diaphragm type) are sometimes preferred over globe valves in dairy CIP headers because diaphragm valves offer better zero-dead-leg CIP design — confirm with the dairy's HACCP requirements which is preferred.