In Short, the role of the check valve in pipe system is to prevent backflow of media. Check valve alsocan be divided into hard seal check valve and soft seal check valve--soft seal check valve sealing performance isoutstanding and it can reach zero leakage, butcanonlybe putin the normal temperature and low pressure pipeline, while hard seal check valve can. And due to the manufacturing process,hard seal check valvealwayshas a certain amount of leakage. But the advantage of hard seal is that it can adapt to high temperature and high pressure environment.

Therefore, you can nothave a frivolous judge that the hard seal check valve is good or soft seal check valveis. Both have their advantages as long as they are correctly installed in the appropriate working conditions on the pipeline.

So how to make a choice between them two?

1. Soft seal

The spin or seat of soft seal check valve is made of non-metallic materials (mainly PTFE, and rubber, etc.). It enjoys remarkable sealing performance, but sustains reproof that it may leave more or less residues (such as welding slag, iron filings, etc.) in the pipeline system as they flow through the regulating valve, which is prone to hurt the valve seat or spool.

Therefore, choosing soft seal check valve means extra notices on the purity of  medium and cleanness of the pipeline before commissioning.

2. Hard seal

Hard seal check valve would adopts welded wear-resistant alloy on its sealing surface which balances sealing performance and the service life and reliability. Although it dwarfs as a competitor with soft seal check valve when it comes to sealing performance, it is enough to meet the needs of most working conditions, and it enjoys durable and longer service life.

Xiamen Dervos is an API-Certified ball valve manufacturing and trading company who specializes in the production of various kinds of valve. In addition to all kinds of common valves such as gate valves, globe valves, plug valves and butterfly valve , we also produce other unconventional valves as long as our customers file their requirements.

We stand ready whenever you have any requests. Contact us today for the best valve purchasing experiences.