Чавунний глобус

1. ВведенняЧавунGмочкаVальве

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

2. Parameters of ЧавунGмочкаVальве

Ущільнювальне обличчя

13Cr,STL, PTFE, нейлон, з матеріалом корпусу

3. Advantages of Чавунgмочкаvальве

1) The structure of the Чавунgмочкаvальве is simpler than that of the gate vальве, and it is more convenient to manufacture and maintain.
2) Ущільнювальна поверхняof Чавунgмочкаvальве is not easy to wear and scratch, and the sealing performance is good. There is no relative sliding between the vальве disc and the sealing surface of the vальве 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 Чавунgмочкаvальве is opened and closed, the disc stroke is small, so the height of the shut-off vальве is smaller than that of the gate vальве, but the structure length is longer than that of the gate vальве.
4) Чавунgмочкаvальве has a large opening and closing moment, which is laborious and takes a long time.
5) The medium channel in the Чавунgмочкаvальве 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 Чавунgмочкаvальве PN≤16MPa, the downstream flow is generally adopted, and the medium flows upward from the bottom of the vальве flap; when the nominal pressure PN≥20MPa, the reverse flow is generally adopted, and the medium flows downward from the top of the vальве flap. In order to increase the seal performance. When in use, the shut-off vальве medium can only flow in one direction and cannot change the direction of flow.
7) The vальве flap is often eroded when the Чавунgмочкаvальве is fully opened.

4. Поширені запитання