Вентил глобус од ливеног гвожђа

1.Увод уЛивено гвождеGрежањVалве

Ливено гвождеgрежањvалве is a forced-sealing vалве, so when the vалве is closed, pressure must be applied to the disc to force the sealing surface to not leak. When the medium enters the vалве from below the disc, the resistance that the operating force needs to overcome is the friction force of the vалве stem and packing and the thrust generated by the pressure of the medium. The force to close the vалве is greater than the force to open the vалве, so Ливено гвождеThe diameter of the vалве stem of the gрежањvалве should be large, otherwise the vалве stem will bend up failure.

2. Parameters of Ливено гвождеGрежањVалве

Заптивајуће лице

13Цр,СТЛ, ПТФЕ, најлон, са материјалом каросерије

3. Advantages of Ливено гвождеgрежањvалве

1) The structure of the Ливено гвождеgрежањvалве is simpler than that of the gate vалве, and it is more convenient to manufacture and maintain.
2) заптивна површинаof Ливено гвождеgрежањvалве is not easy to wear and scratch, and the sealing performance is good. There is no relative sliding between the vалве disc and the sealing surface of the vалве body when opening and closing, so neither abrasion nor abrasion is serious. The sealing performance is good and the service life is long. .
3) When the Ливено гвождеgрежањvалве is opened and closed, the disc stroke is small, so the height of the shut-off vалве is smaller than that of the gate vалве, but the structure length is longer than that of the gate vалве.
4) Ливено гвождеgрежањvалве has a large opening and closing moment, which is laborious and takes a long time.
5) The medium channel in the Ливено гвождеgрежањvалве is tortuous, the fluid resistance is large, and the power consumption is large.
6) When the nominal pressure of the medium flow direction of the Ливено гвождеgрежањvалве PN≤16MPa, the downstream flow is generally adopted, and the medium flows upward from the bottom of the vалве flap; when the nominal pressure PN≥20MPa, the reverse flow is generally adopted, and the medium flows downward from the top of the vалве flap. In order to increase the seal performance. When in use, the shut-off vалве medium can only flow in one direction and cannot change the direction of flow.
7) The vалве flap is often eroded when the Ливено гвождеgрежањvалве is fully opened.

4. ФАК