| 摘要 |
<p>The present invention concerns valve gates for shutting off of pipelines and control of media flow rate through them, in particular, vapor or water having high temperature and pressure, and spindle for the valve gate. Objective of the invention is to enhance reliability and service life of the valve gate for pipelines, and spindle for the same, due to bringing down the corrosion of the spindle and valve gate elements, which come in contact with the spindle through working medium. The objective is achieved by the known valve gate for pipelines, comprising casing (1) with a lid (2), collar tie (3), attached to the casing, spindle (4), made with a threaded section at its upper part and mounted with possibility of displacement by means of collar tie, clamping bar (8), bottom box (9), placed under the bar, and lid with gasket (7), lower end of the spindle being fastened in a yoke (5) attached to a plate interacting with a valve seat (11), the spindle by the invention being made of titanium alloy with oxide layer created on its surface. Oxide layer is created on the surface of the abovementioned spindle up to the threaded section. Use of the spindle made of titanium alloy with oxidized layer in the valve gate substantially decreases corrosion of the spindle and parts of the valve gate, which come in contact with it through the working medium, in consequence of which service life of the spindle and the valve gate increases.</p> |
