Safety measures in Vacuum Valve Operation

Steer clear of valve staggering, incorrect closing, missing opening and lacking closing. The operator shall clearly realize the operate of every single valve and its place in the process pipeline to steer clear of misoperation, or it may possibly result in substance working, mixing, pressure holding and other incidents. For vacuumfittings in point, steam purging is carried out prior to the commence of a refinery tools, and a vent valve is leaked following purging. As a end result, 370 ℃ large-temperature oil slurry is discharged from the vent valve in the course of the commence of the project, causing a hearth, and the gear is shut down.

When the temperature is beneath ℃, the valve that is out of service shall be antifreezed very first, and the plug at the base of the valve shall be opened in time to discharge the condensed h2o inside of. The valves that cannot be cleaned and operated continuously shall be held warm.

For valves operating at substantial temperature, when the temperature rises above 200 ℃, the bolts are heated and extended, which is easy to make the valve seal not limited. When necessary, the bolts shall be “hot tight”. When very hot restricted, it is not appropriate to perform in the completely shut place of the valve. In purchase to avoid the valve stem from getting jacked and difficult to open yet again.

When the valve leaks, the leakage placement and reason shall be identified initial. Generally, the leakage is divided into two sorts: leakage at the packing, leakage at the valve cover, valve physique and leakage at the sealing surface area or material according to the exterior structure. The operator shall precisely choose the leakage, and handle the problems that can be solved by himself in time, and the issues that can not be solved by him in time.

The packing gland of the valve ought to not be pressed too tightly. It is much better that the valve rod can rotate sensitively. If it is pressed way too tightly, the friction of the valve rod will be increased and the operating torque will be enhanced. For the duration of valve operation, it is normally not authorized to substitute or insert packing with stress at will, or else, leakage of medium could result in risks.