中文字幕免费网站亚洲,久久久97精品,久久综和久久合,99中文字幕第一区,精品少妇一、二、三区,国产精品98久久久,青娱乐91,精品人妻高清麻豆av,97人妻精品免费视频

Method of judging internal leakage of natural gas ball valve

?Fixed shaft ball valve is commonly used on natural gas pipelines, and its general inspection method is: turn the valve to the fully open or fully closed po…

Profitable oil is produced from rock joint in Tuha oilfield

?Since the beginning of this year, Tuha Oilfield has established a "highway" for shale oil, tight oil and other reservoirs through various fractur…

Valve performance testing

1. Inspection of appearance and logoCheck content: whether the appearance of the valve has defects, such as cracks, bubbles, dents, etc. Check signage, namep…

The first gas storage group in Northwest China realizes the same production

O-type ball valve and V-type ball valve difference

?Ball valve has many kinds of structure, but basically the same little difference, are the opening and closing parts for the round ball core, mainly by the …

To build a new model of low-carbon and efficient surface system in Dagang Oilfield

On August 22, the oil and gas produced by the oil Wells under the supervision of Wangxuzhuang Oilfield in Dagang was directly transported to the joint statio…

In the thermal system, the thermal trap plays a very important role, and its performance directly affects the stability and energy efficiency of the steam sy…

Changqing Oilfield: Light up "Science and technology Tree" for winter supply "gas storage"

As of October 31, 1,750 Wells had been drilled and 997 Wells had been put into operation in the production capacity construction of the self-operating area o…

Harm and protection of abnormal pressure boost in gate valve

?Gate valves usually have single gate, double gate, wedge, parallel and other structural designs

Valve sealing surface grinding is a key step to ensure sealing performance

The sealing performance of the valve directly affects the control effect of the fluid medium and the safe operation of the system, the grinding of the valve …