| 摘要 |
The flap-valve is made up of an elastomer (1) extended by a stem of the same material (2). The flap-valve allows the passage of fluids to the full 100 percent when the valve is in the open position.The stem serves to fix the elastomer, and independent rust-proof metallic parts (3) are jointed and articulated with respect to the elastomer. These are vulcanised on the upper side part and externally joined to the elastomer.
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