Import A351 Cn7m Alloy 20 Swing Check Valve — Buy in Bulk from Supplier in India

The A351 CN7M Alloy 20 Swing Check Valve from SQK Valves Fittings & Automation Private Limited is a cast non-return valve designed to prevent backflow in corrosive process piping. The swing disc configuration allows full, unobstructed bore passage when open, with lower pressure drop than lift or piston check patterns. The body is cast to ASTM A351 Grade CN7M, the cast equivalent of wrought Alloy 20 (UNS N08020), with deliberate copper additions that enhance resistance to sulfuric acid over standard austenitic grades like CF8M. The supplier indicates Class 150 pressure rating, though complete sizing and dimensional data are not present in the listing.

Swing check valves operate on flow velocity rather than external actuation; the hinged disc lifts with forward flow and returns to seat by gravity and flow reversal. Alloy 20's nominal composition of 33% nickel, 20% chromium, 3-4% copper and 2-3% molybdenum provides a balance of general corrosion resistance and moderate cost for chemical process applications. The hinge pin and disc are typically also CN7M or a compatible alloy to maintain galvanic compatibility. Seat surfaces may be flat or slightly angled; the swing radius determines the minimum velocity required to hold the disc fully open, a parameter relevant to water hammer prevention and pump protection.

This valve pattern is specified where low pressure loss and automatic operation are priorities over tight shut-off, as swing checks cannot seal as completely as dual-plate or piston designs. Target buyers include process engineers at sulfuric acid plants, pharmaceutical fermentation facilities, and chemical fertilizer producers. The listing cites FOB and CIF as available Incoterms, with flexible MOQ. No response statistics are available for this supplier, so proactive follow-up on technical enquiries and sample provision is recommended before order commitment.

SQK Valves Fittings & Automation Private Limited operates from India with imported supplier tier and harbor trust classification. The available profile contains no information on year of establishment, number of employees, manufacturing floor space, or annual turnover. Response metrics show 0.00% response rate and zero recorded average response hours, suggesting the account may be recently registered or not actively managed through the platform interface. No ISO certificate numbers, factory audit reports, or customer references are embedded in the current data.

The company lists automation and valve products including Alloy 20 swing check and globe valves for corrosive applications. For buyers evaluating this supplier, priority verification steps should include direct telephone confirmation of technical capability, request for ASME U-stamp or ISO 9001 scope certificates if claimed, and sample valve inspection before production batch commitment. The absence of response history means due diligence falls entirely on the buyer's procurement process.