| 摘要 |
The invention relates to an orifice for the application of viscous materials and contains a constriction valve with a controllable valve body made of an elastic material. The orifice has two tubes (10,11) of approximately equal size, running in a common longitudinal direction, and a flexible tube (12) of an elastically deformable material which connects these and can be compressed between the two tubes (10,11). An outer tube (15) is sealingly connected to the two inner tubes (10,11) by funnel-shaped parts (16,17) running axially thereto, so that an annular interspace is formed and can be connected to a source of pressure medium. <IMAGE>
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