In the paper,the hazard of impurity and disposal method for gas pipeline are introduced. Suggestions to improve the design,construction and management of valve chamber and blowdown system are put forward.

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Rather than relying on the vacuum chamber alone, the Twin Chamber Blow Off Valve harnesses boost pressure in a second chamber to assist in opening the relief valve.

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When the load smaller than the first outlet pressure adjustment valve set pressure, pilot valve Poppet head off an oil chamber, oil chamber 2 is equal to the pressure on the outlet pressure, the main valve of the sliding shaft 2 inside the cavity in the oil a rigid under the action of a small spring at the lowest position, the main valve and the valve slider protruding shoulder posed by all the valve port opens, pressure reducing valve without decompression.

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Equipped with staniless steel screen in the valve chamber,it is easy to service and maintenance.

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When the deputy valve chamber condensate level rises again, the next cycle began, intermittent drainage.

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It adopts Human and Machine Interface visual technology to implement displaying working status of remote valve chamber devices in real time.

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If gas flow, which enters valve chamber from intake directly, has a large ratio, pressure loss will be little.

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Ball two, one is a floating ball valve, which can be a floating ball in the valve chamber, relying on both ends of the compression ball and stable sealing seat.

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The article introduces electric and control system grounding function and mode; discusses each station valve chamber grounding mode and characteristics in natural gas transmission and distribution pipe network , and analyzes its possible problems, then puts forward solving measures.

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When the deputy valve chamber Balance Valves condensate level falls, the float with the liquid level, the Deputy valve is opened.

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