Valve soft seal and hard seal area how to choose?
1, soft seal in addition to corrosion-resistant lined valves, the general soft seal valve refers to the spool or seat of one of the two non-metallic materials (mainly PTFE, and rubber, etc.) in the form of sealing the valve. Soft seal valve sealing effect is the best, but in the pipeline installation, system cleaning may leave more or less unclean debris (such as weld slag, iron filings, etc.), they flow through the regulating valve, it is easy to soft seal valve seat or spool scratches, so that the leakage increases, sealing the reliability of poor. Therefore, the choice of soft seal structure must consider the cleanliness of the medium and put into operation before strictly flushing the pipeline.
2, hard seal and then surfacing wear-resistant alloy is the best choice of cut-off valve. This way in the consideration of sealing at the same time also consider the service life and reliability, although the factory indicators are only 10-6 ~ 10-8, up to the effect of zero leakage of soft sealing, but enough to meet the requirements of the strict cut-off, and it is durable, from the economic point of view, more cost-effective!
