Pneumatic valve (2) the classification of the short steel gate

。 This structure can be divided into the door
) Parallel brake pneumatic valve, sealing surface and the vertical axis parallel to the two pneumatic valve sealing surface parallel to each other. Parallel slide pneumatic valve is usually double plate structure.
at the same time, in order to make the pneumatic valve thrust wedge structure is the most common, whether it is in double thrust wedge gate, the small diameter of low voltage ( DN - Mm) Pneumatic valve. There is a swing door of two rooms, can produce the pre-tightening force of spring, is conducive to seal the door.
) Pneumatic wedge gate valve, sealing surface and as a point of vertical centerline, the two inlet valve sealing surface wedge.
the sealing surface Angle is commonly ° & amp; #; °和; #; , °, ° ° etc. , according to the high Angle, the size of the low temperature. Generally higher temperature, Angle should take greater at lower temperature, the possibility of a wedge.
in the pneumatic wedge gate valve, and a single ram, double disc and flexible disc. Single pneumatic wedge gate valve, simple, reliable, but high precision processing and maintenance more difficult, easy to grip, wear and temperature changes are likely to be the wedge Angle of sealing surface. Double plate more complex wedge of water and steam pipe, pneumatic valve to use more gate on the media. Its advantages are: low sealing surface Angle precision of temperature does not lead to wedging phenomenon, seal, gasket can be added to compensate. But the structure components can be more easily glue in viscous medium, affect the sealing. But they are mainly use for a long time under the flap of prone to rust, the door easily. Pneumatic flexible wedge gate valves, gate around the structure characteristics of a circular groove, make appropriate flexibility door, it has a single pneumatic wedge gate valve has simple structure, reliable benefits, but also produce a small amount of elastic deformation for sealing surface Angle deviation in the process, improve the process, has been widely used.
special use pneumatic valve, such as long distance oil and gas of the use of large diameter pneumatic valve and clean pipe pneumatic valve single pipe gate structure needs.
。 By construction can be divided into pneumatic valve stem
) Rising stem gate pneumatic valve, pneumatic valve stem nut on the pneumatic valve cover or stents, open and close the damper, using rotating pneumatic stem nut to realize the rise and fall of pneumatic valve stem. The structure of the pneumatic valve pneumatic valve stem of lubrication healthy, clear, therefore, are widely used in the closing.
) Non-rising stem brake pneumatic valve, pneumatic valve rod and the nut direct contact with the medium of the body. Opening and closing door, rotary pneumatic valve stem. The advantage of this structure is: the total height is still the same, so the installation space, space for the installation of large diameter or limitation of pneumatic valve. With this kind of structure to open and close indicator, to indicate the degree of opening and closing. The disadvantage of this structure is: not only can't lubrication pneumatic valve stem threads, and directly to medium erosion, easy to damage.
, reducing the door
if the channel diameter of pneumatic valve body is different, And often in pneumatic seat flange diameter less than the diameter of small) , known as the size shrink. Size shrinkage, can make the parts that were smaller and close the required force decreases, at the same time, enlarge the range of parts and components. But the path contraction. Fluid resistance loss increased. In some sectors of some operating conditions ( Such as oil sector, pipe) Pneumatic valve size shrinkage, are not allowed to be used. This is to reduce the pressure loss of the pipeline on the one hand, is to avoid size shrinkage obstacles mechanical cleaning pipelines.
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