Import A351 Cn7m Alloy 20 Gate Valve 24997 — Buy in Bulk from Supplier in India

The A351 CN7M Alloy 20 Gate Valve 24997 is a full-port gate valve cast from A351 CN7M Alloy 20, an austenitic stainless steel grade with deliberate niobium stabilisation for intergranular corrosion resistance in sulphuric and phosphoric acid service. This valve carries a pressure rating consistent with ANSI Class ratings (typical for this alloy grade) and employs a rising-stem or non-rising-stem actuation depending on configuration, with flanged end connections to ASME B16.5 dimensions. The CN7M material specification corresponds to ASTM A351, covering austenitic castings for pressure-containing parts, with carbon limited to 0.07 % max and copper held at 3.0-4.0 % to enhance acid resistance.

Alloy 20 (UNS N08020) in its cast CN7M form offers a balanced chemistry: 19.0-21.0 % chromium, 32.0-38.0 % nickel, 2.0-3.0 % molybdenum, and the controlled copper addition that distinguishes it from standard 316 stainless castings. The gate and seat surfaces are typically overlaid with hard-facing alloy (Stellite or equivalent, standard industry practice) for erosion resistance in throttling service, though confirm with the supplier whether this unit carries such treatment. Body wall thickness follows ASME B16.34 for pressure-temperature ratings, with typical test pressures at 1.5x rated pressure for shell and 1.1x for seat per API 598. The full-port bore matches nominal pipe size, minimising turbulence and pressure drop in chemical transfer lines.

This valve serves chemical processing plants, acid regeneration facilities, pharmaceutical API manufacturing, and offshore platforms where chloride-induced pitting must be avoided. Buyers typically specify it for sulphuric acid concentrations up to 40 % at moderate temperatures, or for phosphoric acid evaporator circuits. The A351 CN7M alloy also finds use in food-grade dye handling where equipment must tolerate both acid cleaning cycles and product contact. When sourcing from SQK Valves Fittings & Automation Private Limited, confirm the specific pressure class, face-to-face dimension (ASME B16.10 long or short pattern), and whether the unit is supplied with an integral ISO 5211 mounting pad for automated actuation.

SQK Valves Fittings & Automation Private Limited operates as an India-based supplier serving industrial valve and automation markets, positioned within the imported supplier tier and harbour trust classification on this marketplace. The company profile available through this listing does not disclose founding year, factory location within India, headcount, revenue figures, or specific client references, so no such details can be stated. The zero percent response rate and zero average response hours indicate either a new listing, dormant account, or data collection gap rather than active engagement, which buyers should factor into their communication timeline expectations.

The supplier's name suggests specialisation across valves, pipe fittings, and automation equipment, though the exact scope of manufactured versus traded goods is not specified in available data. No ISO certificates, factory audit reports, or export licence numbers are attached to this listing for independent verification. Buyers should request a company profile, manufacturing scope certificate, and reference installations before committing to trial orders. Direct outreach to confirm technical support capability, spare parts availability, and warranty terms is advisable given the limited response signal currently visible.