manually operated metal valves, namely, ball valves and cut-off valves for gas leak prevention; steel bottle valves for liquefied petroleum gas, angle valves; valves for pressure reduction, adjusting valves, discharge valves for safety; valves for metal pipes which provide and discharge water, and valves for general use and pipes

'adjust':30 'angl':24 'ball':6 'bottl':18 'cut':10 'cut-off':9 'discharg':32,43 'gas':14,23 'general':48 'leak':15 'liquefi':21 'manual':1 'metal':3,38 'name':5 'oper':2 'petroleum':22 'pipe':39,51 'pressur':28 'prevent':16 'provid':41 'reduct':29 'safeti':35 'steel':17 'use':49 'valv':4,7,12,19,25,26,31,33,36,46 'water':44

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