World News: 08:15 GMT Monday 25th June 2018. [Clarke Valve via Businesswire via SPi World News]
Clarke Valve announces the API 641 certification of its proprietary Shutter Valve design the first control valve to achieve this certification of low fugitive-emission performance The API 641 standard applies to all ste...
Business Wire: 08:15 GMT Monday 25th June 2018
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