How to distinguish between soft-sealed and hard-sealed valves?
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Apart from checking the interior of the valve, are there any other ways to distinguish between soft-sealed and hard-sealed valves?
The design temperature and pressure can generally be guessed as well
Look at the valve model; for example, Q41F – if the sealing surface is made of PTFE, it is a soft seal. Q47Y: When the sealing surface material is metal, it is a hard seal.
It mainly depends on whether the hard-sealing material is metal or a flexible substance, such as rubber or PTFE. . .
Check the valve model and the material of the valve body; for example, Q41F represents a soft-seal valve, while Q41H represents a hard-seal valve. In some cases, it’s not possible to tell clearly whether the valve body is of soft-seal or hard-seal type
For valve models, Q41F definitely features a soft seal, while Q41H and Q41W use hard seals. Additionally, the medium and temperature play a role here; valves are generally hard-sealed for high and low temperatures. If the medium contains particles, hard seals are also typically used in such cases
For use at normal temperatures, a soft seal is used