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Gases industry review--Q & A.

Gases & Welding Distributor

| March 01, 2003 | Scornavacca, Frank | COPYRIGHT 2003 Penton Media, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

Question: While discussing the specifications of a manifold with my distributor, he recommended that the manifold befitted with both station valves and check valves at the cylinder connections. Isn't this kind of a belt and suspenders recommendation or, worse yet, is he just trying to fatten-up the sale?

Answer: No! There are practical safety and operational reasons for building a manifold with both station valves and pigtail check valves. For example, in the event of a ruptured pigtail, the station valves provide a means of isolating the station with the bad pigtail so that the entire manifold is not discharged. The check vanes provide both safety and purity benefits. Check valves keep air from entering the pigtails and the manifold during cylinder change outs. Check valves also keep the manifold from discharging its contents if someone disconnects prematurely or fails to close a station valve. In any event, a manifold should always have either station vanes or check valves.

As far as the fatter sale is concerned, a manifold with station valves and check valves has ...

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