Safeguards in Vacuum Valve Procedure
Avoid valve staggering, incorrect closing, lacking opening and lacking closing. The operator shall clearly recognize the operate of every valve and its position in the process pipeline to steer clear of misoperation, or it may trigger substance working, mixing, stress keeping and other mishaps. For instance, steam purging is carried out prior to the commence of a refinery equipment, and a vent valve is leaked after purging. As a result, 370 ℃ higher-temperature oil slurry is discharged from the vent valve for the duration of the start of the task, causing a fireplace, and the products is shut down.
When the temperature is below ℃, the valve that is out of support shall be antifreezed initial, and the plug at the base of the valve shall be opened in time to discharge the condensed drinking water inside of. The valves that can not be cleaned and operated continuously shall be held heat.
For valves functioning at large temperature, when the temperature rises over two hundred ℃, the bolts are heated and extended, which is effortless to make the valve seal not restricted. When needed, the bolts shall be “hot tight”. When scorching restricted, it is not appropriate to conduct in the completely closed placement of the valve. In purchase to avoid the valve stem from being jacked and hard to open again.
When the valve leaks, the leakage situation and reason shall be determined initial. Typically, the leakage is divided into two varieties: leakage at the packing, leakage at the valve protect, valve body and leakage at the sealing area or material in accordance to the external composition. The operator shall precisely choose the leakage, and deal with the difficulties 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 should not be pressed as well tightly. It is better that the valve rod can rotate sensitively. If Vccuum pump is pressed as well tightly, the friction of the valve rod will be improved and the functioning torque will be elevated. In the course of valve procedure, it is usually not authorized to exchange or include packing with stress at will, or else, leakage of medium could result in risks.
When the temperature is below ℃, the valve that is out of support shall be antifreezed initial, and the plug at the base of the valve shall be opened in time to discharge the condensed drinking water inside of. The valves that can not be cleaned and operated continuously shall be held heat.
For valves functioning at large temperature, when the temperature rises over two hundred ℃, the bolts are heated and extended, which is effortless to make the valve seal not restricted. When needed, the bolts shall be “hot tight”. When scorching restricted, it is not appropriate to conduct in the completely closed placement of the valve. In purchase to avoid the valve stem from being jacked and hard to open again.
When the valve leaks, the leakage situation and reason shall be determined initial. Typically, the leakage is divided into two varieties: leakage at the packing, leakage at the valve protect, valve body and leakage at the sealing area or material in accordance to the external composition. The operator shall precisely choose the leakage, and deal with the difficulties 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 should not be pressed as well tightly. It is better that the valve rod can rotate sensitively. If Vccuum pump is pressed as well tightly, the friction of the valve rod will be improved and the functioning torque will be elevated. In the course of valve procedure, it is usually not authorized to exchange or include packing with stress at will, or else, leakage of medium could result in risks.
