Controlling Industry Changes T he challenge facing Griswold Con- trols’ engineering and product devel- opment staff in early 2005 was how to address changes taking place in the HV AC in- dustry that were adversely affecting the per- formance of their valves, and those of their competitors, over which they had no control. Over the past few years, chemicals had been introduced into closed HV AC systems that were detrimental to valve components

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