Features:
1. HBH is applied to the large dimension conduits for water or steam as a non-return valve. Its closing speed varies from fast closing to slow shutting, which avoids water hammer.
2. Tilting Disc, triple offset sealing system has no leakage and less flow resistance.
3. First stage's fast closing results in no resistance, subsequent slow shutting has no water hammer.
4. With triple offset plus a big offset structure, disc can depart from seat immediately when opened, and it gets a full seal as the disc touches the seat when closed.

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