A: For most applications, a dual plate (wafer) check valve offers a lighter weight, shorter face-to-face dimension, and lower pressure drop compared to a traditional swing check. However, swing checks are often preferred for high-viscosity fluids or where a fully unobstructed bore is needed for pigging operations in pipelines. We can guide you based on your specific flow conditions.

A: Yes. We specialize in manufacturing stainless steel flange check valves with hardness-controlled materials and non-metallic seals suitable for sour (wet H₂S) environments. We provide full NACE MR0175/ISO 15156 compliance documentation and third-party verification if required.

A: Our lead time for standard Class 150 and Class 300 flanged check valves in CF8 or CF8M is typically 7-15 working days from order confirmation. For high-alloy materials (Duplex, Monel) or special pressure classes (Class 900+), lead time is 20-30 days. We can also expedite for urgent requirements.

A: The rating is determined by the maximum allowable working pressure (MAWP) at the design temperature. For example, a Class 150 SS316 valve is rated for ~275 psi at 100°F, but derates significantly at 400°F. Always reference the ASME B16.34 pressure-temperature charts. Our technical team can calculate this for you if you provide your operating conditions.

A: We understand the need for secure transactions. For initial orders, we commonly accept TT (Telegraphic Transfer) with a 30% deposit and 70% against BL copy, or Irrevocable L/C at sight. For established relationships with good credit, we can explore open account terms or net-30. We also offer production samples with pre-shipment inspection to build complete trust.