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Any one having vented area between 2 seats: ball, gate, plug etc.Rovshan said:What type of valve can be used instead of a Monoblock DBB(one body, 2 balls)valve.
OSHA seems to be of the opinion that a single line valve of any description is not permitted for isolation of hazards during entry into a permit required confined space. (LittleInch said:Interesting. How do they consider an expanding gate? That is much more positive, but isn't two separate valves.?