Views: 0 Author: Site Editor Publish Time: 2020-05-05 Origin: Site
Safety Valve Setting Pressure Deviation and Chattering Problem
Safety Valve Setting Pressure refers to the Opening Pressure under which the pipeline pressure exceeds the equipment safety pressure and the safety valve needs to open immediately at this pressure so as to protect the pipeline equipment from being damaged. If this opening pressure deviated from the pre-setting pressure, it may cause big problem. And the spring chattering problem may also affect the precision of the setting pressure. You can find the main causes and illimination methods for such problems.
Main Problem | Causes | Maintenance Solutions |
Deviation of Setting Pressure value | 1.Caused by working temperature | 1.Pressure regulation under cold state for safety valves used under thermal state, loosen the nut of adjusting bolt and suitably fasten the adjusting bolt. |
2. Caused by spring corrosion | Replace the spring. Under the conditions where media have the property of corrosion, spring used shall be wrapped by fluorine plastic on surface or safety valves with bellows isolation mechanism shall be used. | |
3. Caused by Variation of back pressure | In case that back pressure varies greatly, bellows safety valves with balanced back pressure shall be used. | |
4. Moving parts inside jammed | Check and remove |
Main Problem | Causes | Maintenance Solutions |
Chatter or flutter | 1. Excessive discharge capacity of safety valve ( relative to the required discharge capacity) | Use safety valves of rated discharge as far as possible close to the required discharge of equipment |
2. The diameter of inlet pipe being too small or having too much resistance | Make the inner diameter of inlet pipe not lower than the inlet diameter of safety valve or reduce the resistance of inlet pipe. | |
3. Excessive resistance of discharge pipe ( excessive discharge back pressure) | Lower the resistance of discharge pipe. | |
4. Improper adjustment of adjusting ring | Re-adjust the position of adjusting ring and reduce the excessive re-seating pressure | |
5. Excessive rigidity of spring | Use spring of lower rigidity. |
