1) Parallel Gate Valve: sealing surface and vertical axis parallel to the two valve sealing surface parallel to each other.
In a parallel-type valve in order to wedge-thrust structure with the most common is common, both in the middle of two double-sided thrust wedge gate, which applies to low-voltage small-caliber valve (DN40-300mm) valve. Also have two rooms with a spring damper, spring can produce to the tight power is conducive to ram seal.
2) Wedge Gate Valve: sealing surface and the vertical axis into a certain point of view, that is, two sealing surface into a wedge-shaped valve.
Sealing surface of the tilt angle are generally 2