Class 600 valves appear on high-pressure process lines, boiler feedwater, hydrogen service and large gas systems. The bodies are substantial, the trim is usually upgraded, and the valves are specified with documentation.
That combination makes Class 600 surplus easier to sell than lower classes, provided the valves are complete and the material is identifiable.
Review points
What decides the value of asme class 600 valves
Material grade
WCB, WC6, WC9 and stainless all appear. Grade drives value.
Pressure seal versus bolted bonnet
Pressure seal designs are common above Class 600 and carry their own inspection points.
Documentation
Material and test certificates are expected at this class.
Selling it
How to present the lot
Count by size and pattern, and note the marking on the body. If you have certificates, include them; if you do not, say so rather than implying they exist.
Do not separate trim from bodies to sell them individually unless the trim is clearly identifiable and valuable on its own. In most cases the assembly is worth more together.
Questions sellers ask
Do you buy pressure seal valves?
Yes, and they are common at this class.
Are Class 600 valves in demand used?
Yes, particularly in alloy and stainless.
What about Class 600 relief valves?
Relief valves are bought on set pressure and capacity, not on class alone.