Automatic block valve
Automatic block valve
(OP)
Hi!
Can anyone share philosophy of Automatic Block Valve and emergency block valve?
What are considerations in view of piping design.?
Thank you very much.
Jim
Can anyone share philosophy of Automatic Block Valve and emergency block valve?
What are considerations in view of piping design.?
Thank you very much.
Jim





RE: Automatic block valve
These were normally the standard line class block valve fitted with a rapid action motor or pneumatic operator.
The valve, the operator and the control cables were covered with fireproof insulation.
In an emergency these valves would either close or open (as required) automatically and the plant would be shut-down.
RE: Automatic block valve
Emergency block valve is put in outlet of tanks or equipment that you would want to close in case of emergency. In a fire, the EBV would close. This is for tanks or equipment whose contenets have higher level of hazards. It is for emergency condition isolation.
Good luck,
Latexman
RE: Automatic block valve
The emergency block valve would act as your final layer of protection and the valve should be shut by means of a separate hard-wired interlock.
You can have the same valve performing both applications. e.g. A high level from a level transmitter will shut the valve. If this instrument fails, a separate high high level switch will shut the valve.
I have also seen an application where the above 2 functions are performed by the same valve by having 2 different solenoids each receiving a different signal.
RE: Automatic block valve
Mark Hutton
RE: Automatic block valve
A pneumatic actuator on a quarter turn ball or butterfly valve is more common for an emergency shutdown valve. The emergency shutdown valve should be able to close with no power or air supply.
RE: Automatic block valve
An emergency block (ESDV) will have a fail safe mode where it closes if the motive force (hydrauic or pneumatic energy) is released.
Also it will have a maintenance programme whereby it is tested (every 6 months ususally) to check operation and leakage.
RE: Automatic block valve
There is no difference, mechanically speaking, between an ABV (automatic block valve) and an EBV (emergency block valve). The philsophy behind their operation, fail direction, and maintenance is different.
In my experience ABVs were generally used to seal off around control valves to prevent any liquid/gas leakage down the pipe, so to speak.
Onwards,
Matt