无码视频一区二区三区在线观看 ,AV激情亚洲男人的天堂,林中小屋截取的一段视频 ,无码精品人妻一区二区三区中

News

10 problems often encountered in the use of valves

05

2024-04

10 problems often encountered in the use of valves

01 Why is the two-seat valve easy to oscillate when working with small opening?For a single core, when the medium is flow open, the valve stability is good; W…

Commonly used material heat treatment process of valve body

29

2024-03

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

22

2024-03

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 o…

Causes and treatment of internal leakage of natural gas ball valve

15

2024-03

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 ninth oil production plant of Daqing Oilfield controls the decline in the old area

08

2024-03

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 …

Petrochemical industry downstream demand weakened, the economy fell slightly

01

2024-03

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

26

2024-01

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, gener…