Choosing the correct clamp (or wafer) check valve is essential for system safety, efficiency, and longevity in industrial piping. With a compact design that fits between two pipe flanges, these valves prevent backflow but must be matched precisely to the operating environment. A proper selection hinges on three pillars: understanding the valve's material compatibility, verifying its compliance with relevant industry standards, and confirming its role within your specific system.The main check valve product names of China Check Valve Network include:Flange Vertical Check Valve Flange Single Disc Swing Check Valve，Flange Lift Check Valve，ANSI Swing Check Valve，Tiny Drag Slow Close Swing Check Valve，Butterfly Buffering Check Valve，Flange Tiny Drag Slow Close Muffler Check Valve，Flange Tiny Drag Slow Close Butterfly Type Check Valve Check Valve Products

1. Selecting the Correct Valve Material

The valve material is your first line of defense against corrosion, pressure, and temperature. Choose based on your medium's chemical properties and operating extremes.Check Valve Standard

General Service & Cost-Effectiveness:Carbon steel is common for non-corrosive services, while stainless steels (SS304/SS304L, SS316/SS316L) offer excellent general corrosion resistance.

Highly Corrosive or Challenging Media: Consider advanced alloys like Duplex steel (F51/F55), Hastelloy, Inconel, Monel (400/500), or 20# alloy. These are designed for harsh chemical, offshore, or sour service environments.

Specialized Applications:Titanium alloy offers exceptional strength-to-weight ratio and corrosion resistance; aluminum bronze is often used for seawater applications; chromium-molybdenum stee is suited for high-temperature services.

Low-Temperature Environments: Specially treated low-temperature steel is required to prevent brittle fracture.

2. Navigating Key Standards and Specifications

Compliance with recognized standards ensures valve performance, interchangeability, and safety. Key standards to specify or verify include:

Design & Manufacturing: API 594 (specific to check valves) and API 6D (pipeline valves) are critical benchmarks. JB/T 8937 and JB/T 3595 are common Chinese standards.

Pressure-Temperature Rating: ANSI B16.34 defines pressure-temperature ratings for valve shells. Equivalent standards include DIN 2401 and GB/T 9124.

Testing & Inspection: API 598 is the globally recognized standard for valve testing. JB/T 9092 and GB/T 13927 are widely used for factory acceptance tests.

End Connections & Dimensions: Standards like ANSI/ASME B16.10 (face-to-face dimensions), ANSI/ASME B16.5/DIN 2543 (flange standards), and API 605 govern how the valve integrates into your piping.

3. The Critical System Role of Check Valves

The primary function is automatic, passive backflow prevention, which protects upstream equipment in two vital scenarios:

In Pump Protection: Installed at the pump discharge, a clamp check valve prevents destructive water hammer and reverse rotation. If a pump stops suddenly, the valve closes instantly to block high-pressure water from flowing back and damaging the pump impeller or causing motor reversal.

Do you still need to know or purchase the following check valve products: