Our client required "Super Flat Check Valve" on the project piping classification.

What is "Super Flat Check Valve"?

I can just guess that it is the specific brand name of the wafer check valve because client specified API 594 for that valve.

However I can not find any product on the internet.

Please give me your bright knowledge...

When such 'special' descriptions occur, most often the originator has a special valvetype from a special maker in mind. Superflat can come from a commercial presentation.

Go to the source!

That said, wafer check valves comes in a number of types and constructions, materials and sealing properties. To mention the most common wafer types: (top) hinged disc, double disc (central stem), disc (axial movement of disc).

The suitability to any process will vary according to type and construction.

A valve, is a valve, is a valve = FALSE  

Its most likely a Wafer Check.

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