Strainer Factory & Factories: Global Procurement, Fluid Hydrodynamics & Industrial Solutions

A properly engineered industrial strainer should have a minimum free open area ratio of 3:1, with premium high-capacity basket strainers offering 4:1 or higher. The free open area is defined as the total net screen opening area divided by the internal cross-sectional area of the inlet pipe. Maintaining a minimum 3:1 ratio ensures that the strainer can collect significant particulate volume before the internal differential pressure drop increases to critical levels, thereby safeguarding pumps and flow meters against cavitation.

Perforated sheet screens (punched holes) are typically used for coarse debris filtration, with standard hole diameters ranging from 1/16" (1.5 mm) to 1/8" (3.2 mm) for water and larger pipe diameters. For fine filtration, a woven wire mesh liner is layered over the rigid perforated support basket. Mesh is measured by the number of openings per linear inch. For example, 20-mesh retains particles down to approximately 840 microns (0.033"), 60-mesh down to 250 microns (0.010"), and 100-mesh down to 149 microns (0.0059"). Selecting an overly fine mesh increases cleaning frequency and hydraulic drag, so the mesh opening should match the maximum allowable particulate threshold of downstream mechanical seals or heat exchangers.

Y-strainers are preferred for compact piping layouts, high-pressure gas/steam services, and lines with low-to-moderate particulate loading. They can be installed either horizontally or vertically in downward-flow lines. Conversely, Basket strainers are generally configured for horizontal liquid lines where higher particulate loading occurs; their upright basket chamber provides substantially higher debris accumulation volume and lower pressure loss. For critical continuous processes that cannot be shut down for screen cleaning, a Duplex diverter strainer is mandatory to allow manual or automated switching between filtration chambers.

ZFA Valve engineers and pressure-tests pipeline strainers and associated isolation valves according to ASME B16.34 (Valves Flanged, Threaded, and Welding End), API 598 (Valve Inspection and Testing), ISO 5208 (Industrial Valves - Pressure Testing), EN 12266-1, and DIN 3230. Flanged dimensions are machined to match ASME B16.5, EN 1092-1/2, BS 4504, JIS B2220, or AS 2129 per the client's engineering datasheets.

For saline, brackish, or reverse osmosis seawater intake lines, standard carbon steel and cast ductile iron are vulnerable to rapid pitting and galvanic corrosion. Standard practices require Nickel-Aluminum Bronze (ASTM B148 C95800), Super Duplex Stainless Steel (ASTM A890 Grade 4A/5A), or internal lined ductile iron bodies coated with minimum 300-micron high-performance Fusion Bonded Epoxy (FBE) or vulcanized hard rubber (Ebonite). The internal screen must be constructed from matching Super Duplex (2507) or Monel K-500 to avoid severe galvanic cell formation.

Yes. ZFA Valve supports full OEM casting, custom body tagging, private-label branding, customized flange drillings, and special paint coating cycles (e.g., NORSOK M-501 offshore marine epoxy systems). We routinely facilitate independent third-party inspections (TPI) at our Tianjin manufacturing center by international agencies including SGS, BV (Bureau Veritas), TÜV, DNV, and Lloyd's Register.