Medium Type Three Piece Female Thread Ball Valve

Restricted by integral or two-section cavity construction, one-piece and two-piece screwed ball valves demand full removal from pipelines for maintenance once seats or balls suffer corrosive abrasion from process media; medium three-piece female thread ball valves, assembled by left and right bonnets plus central main body locked with external stainless steel bolts, allow cavity separation simply by loosening outer fasteners without full pipeline disconnection, enabling rapid replacement of wearing parts such as internal seals and solid balls. Another merit brought by exposed bolted assembly lies in partial replacement: should any single valve segment encounter local rust or damage, only the faulty section needs swapping instead of scrapping the whole valve, drastically cutting spare part expenditure and shutdown overhaul duration for continuously operated chemical and air compressor integrated units.

Overall valve design and fabrication strictly align with GB/T12237 national steel ball valve code and American industrial ball valve standard ANSI B16.34; face-to-face structural length follows dual benchmarks GB/T122221 and ASME B16.11, while matching thread and flange dimensions comply with GB/T9113.1 and ASME B16.5 Class150. Air tightness and shell hydrostatic strength inspections for every finished unit uniformly adopt universal valve test clauses GB/T13927 and API598. Complete material test reports, pressure test logs and dimension drawings can be submitted directly to overseas EPC projects for acceptance filing and cross-border customs clearance. Its maximum rated operating pressure is limited to 1.6MPa, with a wide thermal tolerance window ranging from -40℃ cryogenic chilled media to 180℃ high-temperature heat transfer oil, suitable for four categories of general clean fluids: water, compressed air, light fuel oil and low-pressure gas.

Internal female threads on both ends support customization of mainstream global pipe thread specifications, covering seven universal systems: BSP, BSPT, NPT, DIN, JIS, RC and G. Direct connection to national standard metal pipelines is realized without transition adapters, slashing on-site piping material and labor cost for compact skid-mounted equipment and HVAC circulation units. The full size spectrum spans all standard bore sizes NPS1/4" to 4" (DN6~DN100), with standardized fixed values for flow bore d, overall valve length L, total vertical assembly height H, full hand lever span W and fastening bolt size 4-d per nominal diameter, removing repeated non-standard dimension verification for mass skid piping layout design.

All measuring units on dimension charts are unified as millimeters: d stands for unrestricted full-port inner flow bore diameter, L refers to total length between two female thread ends after three valve segments are assembled, H means total vertical height of fully finished valve assembly, W is the full extended length of blue non-slip plastic coated operating lever, and 4-d denotes quantity and single hole diameter of three-section locking bolts. Compared with one-piece and two-piece ball valves, the three-piece split design delivers larger internal cavity maintenance space, allowing full extraction of complete ball and seat sealing assemblies with unobstructed overhaul vision. The unobstructed straight-through full-port flow bore contains no throttling steps to minimize fluid resistance, steadily cutting long-term power consumption of delivery pumps.

Compressed air circulation pipelines for medium & small air compressors, HVAC hot-cold exchange water lines, miniature lube oil delivery skid units, municipal low-pressure gas branch pipelines and auxiliary clean chemical reactor piping in light industry all form core application scenarios for this medium three-piece female thread ball valve. Its three-piece dismountable body construction, paired with three core designs: anti-blowout anti-static central stem and full-port flow bore, makes it a universal shut-off valve balancing maintenance convenience, safe tightness and low flow resistance, widely matched to all types of medium & small fluid integrated equipment.