Should an emergency shut-off valve be an electric valve or a electro-hydraulic valve?
Thread Content
The last edit to this post was made by hhj0705 on 2019-12-12 at 10:31. I would like to ask: for emergency shut-off valves in refined oil storage areas (without a gas supply), should 1) electric valves + fire shields + dual power supplies be used?； 2. Electro-hydraulic valves: What are the advantages and disadvantages of each of these two solutions? (Considering reliability, construction, and maintenance costs) Which one is used more these days?
Is there a time limit for cutting off?~~~
For practicality, construction, and subsequent maintenance, let’s use Plan 1!
Compared to electric, hydraulic is probably faster, right?
From a safety perspective, option 2 is the choice; only 2 can provide rapid and safe explosion isolation.
The reason for choosing 2 instead of 1 is that electric power cannot ensure urgency
How to ensure the valve is in its safe position when the power supply for the electric actuator is disconnected? How is the action time guaranteed? Close the valve for more than 1 minute
From the perspectives of safety and cost, if there is no gas supply in the tank area, the gas supply source can be repositioned. Electric or electro-hydraulic control systems are not as good as pneumatic systems; when it comes to emergency shutdown functions, the costs end up being roughly the same