亚洲国产午夜看片_精品香蕉免费大视频日韩亚洲欧美一区_最近中文字幕mv在线视频_免费福利一区二区三区_欧美牲一级精品免费_最近最新电影大全免费观看_精品日韩手机在线_有奶水哺乳期无码AVAV_中文字幕不卡在线_国产精品久久福利网站下载

Commonly used material heat treatment process of valve body

Valve body blank heat treatment process according to different materials are as follows:1. Heat treatment of gray cast iron

CCUS flooding in Jilin oilfield realizes the point of "carbon" to gold

Jilin Oilfield is committed to low-carbon development and green transformation, and has realized "carbon" into gold. As of March 5, in the 15 years of Changling gas field development

Causes and treatment of internal leakage of natural gas ball valve

Causes of ball valve internal leakage1. Reasons for internal leakage of the valve during the construction period:① Improper transportation and hoisting causes the overall damage of the valve, resulting in internal leakage of the valve;

The ninth oil production plant of Daqing Oilfield controls the decline in the old area "due to the policy of Tibet"

In the first two months of this year, the ninth oil production plant of Daqing Oilfield used diversified means to continuously strengthen the potential of the old area, and crude oil production increased by 195,000 tons year-on-year.

Petrochemical industry downstream demand weakened, the economy fell slightly

As the northern Hemisphere enters winter in November, temperatures are generally cooler, economic activity weakens and demand falls.

What is the balance hole of the ball valve

First, the function of the ball valve balance holeThe balance hole is also called the compensation hole, which refers to a channel inside the ball valve, generally located between the two sealing surfaces above and below the ball. Its role is to balance the pressure on both sides when adjusting t…

The cumulative gas production of a single well in Fuling Shale Gas Field is 400 million cubic meters, setting a domestic record

The first integrated development project of pumped storage and conventional hydropower in the country has started construction

How should the valve sealing gasket be installed?

Sealing gasket is a sealing part often used in machinery, equipment, etc., is a sealing material, but also an indispensable part of machinery and equipment, so it is very important to know how to install sealing gasket. The correct installation can ensure the sealing performance of the machinery …

Maintenance and upkeep of valves

Valve storage and maintenance1. The purpose of storage and maintenance is to prevent valve damage or reduce quality during storage. In fact, improper storage is one of the important reasons for valve damage.2. Valves should be kept in an orderly manner. Small valves should be placed on shelves, w…