Mailing List Archive

Mailing List: techdiver

Message Display

> George made an excellent arguement against using metal knobs, which I 
> advocated to reduce the likelyhood of rolling a valve shut. The point 
> being the knob can be dented if sufficiently struck in such a way that 
> the dent will interfere with the valve body and you will not be able to 
> open or close the valve.  The tradeoffs are: a rolled-shut valve or not 
> being able to shut the valve in the event of an emergency. 

The caveat is that the plastic knobs need to have a metal insert at the 
interface between the knob and the valve stem (correct word?).  Many older 
plastic knobs do not - the interface is plastic.  On several occassions I 
have stripped the plastic knob interface so that the knob no longer 
turns the valve - once when I needed the gas for decompression.  Keeping 
the valves lubed and well-maintained should make this a non-issue, but I 
replaced all my valve knobs anyway.

Aloha,
Rich

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]