Technical Articles

The Application of DBB Ball Valves to Offshore Oil Platforms

• Jun Wed, 2022
• Hits: 26

Abstract: Since offshore platforms have strict requirements in terms of space, quality and safety, a new type of integrated DBB valve came into being. The sealing principle and structural form of DBB...

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Causes and Measures of Defects of Heavy Hammer Check Valves

• May Thu, 2022
• Hits: 7

Descriptions and causes of defects After a long-term operation, the main defects and causes of the heavy hammer check valve are shown in Table 1.   Table 1 Defects and causes of heavy hammer check...

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The Structure, Working Principle & Selection of Heavy Hammer Check Valves

• May Mon, 2022
• Hits: 11

Check valves are widely used in industrial factories. Lift check valves, swing check valves, butterfly check valves and diaphragm check valves have their advantages and disadvantages, which should be...

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Pickling Passivation of Austenitic Stainless Steel Valves

• Apr Tue, 2022
• Hits: 199

Pickling passivation The corrosion rate is significantly lower than that without any treatment after the metal acting with an oxidizing medium, which is called passivation of the metal.   The passivation...

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Structural Design & Optimization of Limit Locking of Ball Valves

• Apr Tue, 2022
• Hits: 49

1. Overview        A ball valve is a kind of rotary valve with a ball as the opening and closing part. The main driving modes of ball valves are manual, electric,...

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Problems Existing in the Fault Diagnosis Technology for Valves

• Mar Wed, 2022
• Hits: 5

Detection accuracy for the valve state parameter is not high. Measuring the state parameters of the valve is the basis for valve fault diagnosis, but some detection methods and equipment currently have...

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The Current Situation of the Valve

• Mar Fri, 2022
• Hits: 13

A valve is an important fluid control device in the industry, involving all walks of life, especially petroleum and petrochemical, liquid transportation and other industries. The emergence of...

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DBB and DIB Valves

• Feb Mon, 2022
• Hits: 158

There are two sealing structures of common seats for trunnion mounted ball valves. (1) DBB valves (double block and bleed valves) DBB valves are valves that have two...

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Solutions to Internal Leakages of Plug Valves

• Jan Thu, 2022
• Hits: 17

The ESD high-pressure vent pipe in the station yard is under long-term single sided pressure on the plug valve. The working condition is harsh and frequent internal leakage occurs, and...

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Forced Sealed Valves for Natural Gas Pipelines

• Dec Mon, 2021
• Hits: 20

A forced sealed valve is also known as a double block and double bleed valve, which was first used for oil depots in the airport, and was mainly used in metering systems,...

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The Structural Characteristics of the Pressure-balanced Plug Valve

• Nov Fri, 2021
• Hits: 78

The features of the plug valve The plug valve uses a plunger body with a through hole as an opening and closing part, and the plunger body rotates 90° with the valve stem to realize the function...

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Kinetic Analysis and Reliability of Pneumatic Cryogenic Gate Valves with Open Spheres

• Oct Fri, 2021
• Hits: 10

The kinetic analysis and reliability demonstration of the main parts of the gate valve under low-temperature conditions have provided a theoretical basis for the development and application of the...

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NDT for Inspecting Performance and Quality of Valves

• Oct Sat, 2021
• Hits: 50

In the casting process of a valve, sometimes there are defects such as gas holes, porosity, impurities, etc., which affect the normal use of the castings. Welding repairs are usually performed. After...

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The Design of Valves Is Related to the Costs of Valves

• Sep Sun, 2021
• Hits: 16

Reducing costs are the goals of various industries and the valve industry is no exception. Some owners in the valve industry think that the design cost of valves greatly influences the overall cost...

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The Structure Design of LNG Ultra-low Temperature Valves

• Jul Wed, 2021
• Hits: 62

1. The longneck bonnet structure The temperature of LNG is -162°C, which is extremely low. The working temperature of the packing of the valve should not be lower...

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LNG Cryogenic Valves

• Jul Mon, 2021
• Hits: 29

1. Liquefied natural gas With the development of industry and the improvement of people's living standards, natural gas, especially liquefied natural gas has become the most indispensable high-quality...

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The Analysis of Breaking of Screws of the Natural Gas Gate Valve's Flange

• Jun Wed, 2021
• Hits: 6

When a natural gas company was inspecting and repairing the pipeline, it was found that some of the fastening screws of flanges of gate valves were broken. The gate valve is buried below ground. The...

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Sixteen Common Questions in Selection of Valves (Part Two)

• Jun Wed, 2021
• Hits: 6

11. Why is the anti-blocking performance of control valves with straight strokes poor, while that of the rotary motion valve is good?　 　 Valve spools of straight strokes throttle vertically, and the medium...

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Sixteen Common Questions in Selection of Valves (Part One)

• May Fri, 2021
• Hits: 14

A valve is one of the indispensable devices in industrial production, and you may encounter many questions from selection, use to the maintenance of valves. Some common questions are listed in this article....

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Advantages and Disadvantages of Soft Sealing Gate Valves

• May Wed, 2021
• Hits: 22

Overview of soft sealing gate valves A soft sealing gate valve is a manual valve used to connect media in water conservancy projects. A soft seal gate valve is composed of valve seats, valve bonnets,...

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