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Spherical surface sealing butterfly valve
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Buried butterfly valve
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A kind of unload-type pilot valve
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A kind of spoke flow valve core underground pressure regulator
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A kind of radial-flow gas pressure regulator, governor
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A kind of apparatus and method for demarcating measuring instrument
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Pre-payment control system in a kind of natural gas high pressure station
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Fuel gas supply system with safety protection function
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a kind of intelligent gas flowmeter
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A kind of new gas pressure regulator
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A kind of turbine flowmeter for gas with thrust Self-balancing
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A kind of middle compression ignition air pipe straight-through valve
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Exhaust and blowdown assembly of piston type standard volume pipe
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