Manually operated butterfly valves, ball valves and sample valves, all made principally of metal; check valves made principally of metal

'ball':5 'butterfli':3 'check':15 'made':11,17 'manual':1 'metal':14,20 'oper':2 'princip':12,18 'sampl':8 'valv':4,6,9,16

Automated butterfly valves, ball valves and sample valves; [ electric valve actuators; ] sight flow indicators in the nature of fitted attachments to be installed with or near valves or other piping components to verify flow

'actuat':11 'attach':20 'autom':1 'ball':4 'butterfli':2 'compon':31 'electr':9 'fit':19 'flow':13,34 'indic':14 'instal':23 'natur':17 'near':26 'pipe':30 'sampl':7 'sight':12 'valv':3,5,8,10,27 'verifi':33

'actuat':5 'hydraul':3 'pneumat':1 'valv':4

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