A double door check valve uses two spring-loaded discs that close quickly, minimizing water hammer. It is more compact and lightweight than a swing check, making it ideal for low-pressure or vertical installations. Swing checks rely on gravity and are better for horizontal lines with higher flow rates.

Yes. We offer full pressure classes from Class 150 to Class 600, with flanged, wafer, or lug ends per ASME B16.5. Custom drilling (e.g., API 6A) is available for specific projects.

For standard materials (WCB, Class 150–300), lead time is 15–20 working days. For stainless steel or higher classes, allow 25–30 working days. OEM/custom orders typically ship within 35–40 days. We also offer express production (12 days) for urgent requirements.

Absolutely. We offer free samples for qualified engineering evaluations (up to 4″ size). The buyer covers shipping, and we provide full test reports. For larger sizes, we offer a money-back guarantee if the valve does not meet the agreed specification.

Every shipment includes: ISO 9001 certificate, CE declaration, material certificates (EN 10204 3.1), pressure test report, dimension report, and NDE reports (if requested). Third-party inspection (SGS, BV, Lloyds) is accepted and can be arranged at your cost.

We ship via sea freight (FOB/CIF/DDP) from Tianjin port. For US buyers, we offer DDP (Delivered Duty Paid) – you receive the valves at your door with no hidden costs. Typical transit time: 20–28 days to Houston, Los Angeles, or New York. We also provide air freight for urgent orders (5–7 days).

We accept T/T (30% deposit, 70% against BL copy), L/C at sight, and Western Union. For established US customers, we can extend net 30 or net 60 after credit review. Minimum order value: $2,000 for standard valves.