What is ESD valve? 1

[prosperavalve]

Hello, All,
I'm new comer, and very glad to find this place to help out my valve knowledge. Can anyone explain to me what is ESD valve?
Thanks.
Emay

 

[stanier]

Esd= Emergency Shut Down .

generallyn these are separate valves to normal operating valves and are employed to provide a safe shutdown of a process. that doesnt mean that they close immediately as this may not be the safest wa a plant is shutdown.

The ESDs may respond to different logic to the normal control system. It may well be a separate control system, possibly hardwired, that enacts the shut down.

Look at a P&ID for a refinery or petrochem plant and you see the ESDs marked. If you work through a control functional description you will understand how the ESd valves are meant to operate.

 

[khan101]

By definition emergency shutdown valves are designed to take the process to a safe state if certain, pre-specified operating limits are exceeded. The major problem with these valves relates to the fact that they typically operate in one static position for long periods of time and only move in an emergency situation.