| 摘要 |
A stem valve stopper that has a shell (1) intended to be mounted to the body of a cock, tap or faucet. A mobile fitting (6) is mounted in the shell so that it can be moved axially and so that it cannot be turned or rotated inside the stopper shell and carries a valve seal (13). An operating stem (8) is mounted for rotation, but is axially fixed in the stopper shell. The stem has one end inside the shell that is threadably engaged with the mobile fitting, and an outer end (8) protruding from the shell of the stopper and constructed to receive an operating handle. The valve seal, supported by the mobile fitting of the stopper is made up of an elastomeric material. A collar (10) is made of rigid material and is mounted in the stopper shell. The collar has a valve seat at one end and is seated on the other opposite end about a passage (p) of the cock, tap and/or faucet. The valve seat is made of elastomeric material and preferably inside its retaining regions has a hollow space so that, in the closed mode, it is dilated by the pressure of the water to press against the valve seat.
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