Alloy 20 Wafer Check Valve USA Procurement Guide

Procurement guide · Supreme Valves India · June 2026

US procurement teams sourcing Alloy 20 dual-plate wafer check valves for sulfuric acid dilution, copper heap leaching raffinate loops, and fertilizer plant acid headers need a clear material specification, testing baseline, and import logistics plan. This guide covers what to specify on your RFQ and what documentation to expect on delivery.

When to specify Alloy 20 wafer check valves

Dual-plate wafer check valves in Alloy 20 are specified when:

• The medium is sulfuric acid at any concentration from dilute (5%) through concentrated (97%)
• The line is a raffinate return in copper heap leaching with chlorides and abrasive fines
• SS316 CF8M has failed within 6–18 months due to pitting or uniform corrosion
• Space is limited and a compact wafer profile (API 594 face-to-face Table B) is required between ASME B16.5 flanges

Full Alloy 20 construction specification

For maximum corrosion resistance, specify full Alloy 20 construction — not just the body:

RFQ checklist for US buyers

1. Valve type: Dual-plate wafer check, non-slam, spring-assisted closure
2. Size: NPS (e.g., 2", 4") — wafer to suit ASME B16.5 Class 150 or 300
3. Material: Full Alloy 20 UNS N08020 / CN7M per table above
4. Standards: API 594, API 598, face-to-face per API 594 Table B
5. Testing: Shell 1.5× WP, seat 1.1× WP per API 598
6. Quantity: Including sample qty-1 for engineering verification if needed
7. Delivery: DAP to city/state/ZIP (e.g., Saint George, Utah 84770)
8. Payment: USD wire transfer terms
9. Documentation: EN 10204 3.1 MTC, hydrostatic test report, commercial invoice with HS 84818030

Typical pricing and lead time

Alloy 20 wafer check valves are specialty items — pricing reflects CN7M foundry casting cost, precision machining, and full-material construction. As a reference, NPS 2" Class 150 full Alloy 20 dual-plate wafer check valves with DAP air freight to the USA typically fall in the USD 900–1,200 range; NPS 4" in the USD 1,800–2,200 range (subject to exchange rate and specification).

Manufacturing lead time is typically 8–10 weeks from purchase order, including foundry casting, machining, assembly, and API 598 hydrostatic testing.

US delivery logistics

Under DAP Incoterms 2020, the Indian supplier handles export packing, inland transport to Ahmedabad Airport (AMD), air freight to the US destination airport (e.g., LAS, IAH, TPA), and export customs clearance. The US buyer handles import customs, duties/tariffs, customs broker fees, and inland trucking from the airport to the job site.

Indian-origin industrial valves are not subject to Section 301 tariffs that apply to Chinese-manufactured valves under HTSUS 8481 — a significant cost advantage for US buyers.