Safeguards in Vacuum Valve Procedure
Steer clear of valve staggering, wrong closing, lacking opening and lacking closing. The operator shall clearly comprehend the purpose of each and every valve and its situation in the process pipeline to avoid misoperation, or it could cause material managing, mixing, pressure keeping and other accidents. For case in point, steam purging is carried out prior to the begin of a refinery gear, and a vent valve is leaked after purging. As a outcome, 370 ℃ substantial-temperature oil slurry is discharged from the vent valve in the course of the start of the venture, triggering a fireplace, and the equipment is shut down.
When the temperature is below ℃, the valve that is out of services shall be antifreezed 1st, and the plug at the base of the valve shall be opened in time to discharge the condensed drinking water inside. The valves that can not be cleaned and operated continuously shall be held heat.
For valves working at large temperature, when the temperature rises previously mentioned 200 ℃, the bolts are heated and extended, which is straightforward to make the valve seal not tight. When required, the bolts shall be “hot tight”. When scorching restricted, it is not suited to perform in the fully shut situation of the valve. In order to stop the valve stem from getting jacked and challenging to open up once more.
When the valve leaks, the leakage place and reason shall be determined 1st. Typically, the leakage is divided into two sorts: leakage at the packing, leakage at the valve include, valve body and leakage at the sealing floor or fabric according to the external framework. The operator shall precisely choose the leakage, and take care of the issues that can be solved by himself in time, and the troubles that can not be solved by him in time.
Coating Equipment packing gland of the valve must not be pressed too tightly. It is greater that the valve rod can rotate sensitively. If it is pressed too tightly, the friction of the valve rod will be elevated and the running torque will be improved. Throughout valve procedure, it is generally not permitted to substitute or add packing with force at will, normally, leakage of medium might result in pitfalls.
When the temperature is below ℃, the valve that is out of services shall be antifreezed 1st, and the plug at the base of the valve shall be opened in time to discharge the condensed drinking water inside. The valves that can not be cleaned and operated continuously shall be held heat.
For valves working at large temperature, when the temperature rises previously mentioned 200 ℃, the bolts are heated and extended, which is straightforward to make the valve seal not tight. When required, the bolts shall be “hot tight”. When scorching restricted, it is not suited to perform in the fully shut situation of the valve. In order to stop the valve stem from getting jacked and challenging to open up once more.
When the valve leaks, the leakage place and reason shall be determined 1st. Typically, the leakage is divided into two sorts: leakage at the packing, leakage at the valve include, valve body and leakage at the sealing floor or fabric according to the external framework. The operator shall precisely choose the leakage, and take care of the issues that can be solved by himself in time, and the troubles that can not be solved by him in time.
Coating Equipment packing gland of the valve must not be pressed too tightly. It is greater that the valve rod can rotate sensitively. If it is pressed too tightly, the friction of the valve rod will be elevated and the running torque will be improved. Throughout valve procedure, it is generally not permitted to substitute or add packing with force at will, normally, leakage of medium might result in pitfalls.
