Class 300 sits between general utility service and high-pressure process duty. It is common on refinery and chemical lines where Class 150 would be marginal and Class 600 would be over-specified.
Class 300 valves are usually standard catalogue items, which makes them straightforward to price. Condition, material and size drive the number.
Review points
What decides the value of asme class 300 valves
Standard patterns
Class 300 gate, globe and check valves are catalogue items and easy to place.
Trim
Stainless and stellite trim is common and adds value.
Flange condition
As with all flanged valves, the faces decide a lot.
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 Class 300 ball valves?
Yes, particularly in stainless and in actuated configurations.
Are Class 300 valves worth more than Class 150?
Generally yes, because the castings are heavier and the service is more demanding.
What about Class 300 in alloy?
Alloy Class 300 valves are strong items, especially with certification.