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Analysis and Improvement of Leakage at Flanges of High Pressure Ball Valves (Part Two)

3. Solutions The blind plate pressure test method can detect the stud strength of the middle flange and the leakage of the sealing surface, and will not have any external force damage to the middle flange. However, it has disadvantages such as low efficiency of the test process. At the same time, the...

Analysis and Improvement of Leakage at Flanges of High Pressure Ball Valves (Part One）

Abstract: Aiming at the leakage often occurred during the manufacture and use of high-pressure three-piece ball valves, analyses and discussion are carried out from the three perspectives concerning the valve's structural characteristics, test methods and field use, and solutions...

Five Main Characteristics of Plug Valves with Soft Sealing

A plug valve is a valve which uses a closing part or a plug to rotate 90° around the centerline of the valve body so as to achieve the purpose of opening and closing. A plug valve is mainly used for cutting off, distributing and changing the flow direction of the medium in the pipeline. A plug valve...

Which Valves Are Dedicated Valves for the Coal Chemical Industry?

Besides some general-purpose valves used in some coal chemical industry conditions, dedicated valves for the coal chemical industry are as the following:   Metal hard sealed wear resistant ball valves, including lock hopper valves, air release valves and balance...

Related Knowledge of Desulfurization Butterfly Valves

The size of a stainless steel valve should be accurately selected for a desulfurization butterfly valve according to the required flow rate (the Cv value). The diameter and opening angle of a stainless steel valve should be calculated according to the required flow rate (Cv value) and...

Why Is It Forbidden to Use Gate Valves in Oxygen Pipelines?

According to the regulations of valve materials in GB 16912 Oxygen and Related Gas Safety Technical Regulations, when the pressure is greater than 0.1MPa, it is strictly forbidden to use gate valves. When the pressure is between 0.1 and 0.6MPa, the valve disc should be made...

Comparison between Bellows Globe Valves and Common Ones

The bellows globe valve is also called the bellows seal globe valve. Through automatic roll welding, a metal barrier is formed between the flowing medium and the atmosphere to ensure zero leakage of the valve stem. Compared with the traditional globe valve, the bellows seal one has the following advantages:...

Quality Inspection of the Cryogenic Valve

Cryogenic valves play an important role in LNG (Liquefied Natural Gas) applications. Quality inspection is a very important process for the cryogenic valves. The details of the quality inspection of these valves are as follows. Preparation for quality inspection of cryogenic...

The Advantage of Four Way Ball Valves

1. The handle, pressed by steel plate or cast by stainless steel, can be adopted. The handle is equipped with limiting displacement, which is set at the opening and closing positions of four way ball valves. When the valve is used for key devices, the limit block is provided with a keyhole...

Tips for Selecting Y-type Strainers Used in Public Places

1. Applicable temperature Many in charge of public places think that the Y-type strainer is made from metal, so it is unnecessary to consider its applicable temperature. However, according to the manufacturer of Y-type strainers, due to the applicable medium, large temperature...

A Brief Introduction to Basket Strainers

The basket strainer is used for oil pipes or other liquid pipes to filter the debris in the pipe. The area of the filter holes far exceeds the filter area of Y-type and T-type strainers. The structure of the strainer mesh is different from that of other strainer meshes....

How to Distinguish the Quality of Pneumatic Ball Valves

Now there are increasingly brands and categories of pneumatic ball valves in the market, and the quality is patchy. As a buyer, how can you distinguish the quality of pneumatic ball valves? First of all, pay attention to the appearance of the pneumatic ball valve to see if there...

How to Repair Electric Ball Valves?

1. Only when the inlet and outlet pressure of electric ball valves is removed can the ball valve be disassembled. 2. In the process of disassembly and reinstallation of electric ball valves, it is necessary to protect sealed parts, especially nonmetal parts, for instance, O-rings. 3. When the valve...

Why Submarines Adopt Old Mechanical Valves Instead of Electric Ones

With the development of science and technology, life becomes more and more convenient, and intelligence and mechanization have become people's new pursuit. Under such a background, electric valves have been widely used in modern industry since their first appearance. However, unexpectedly,...

What is a High Pressure Gate Valve?

The opening and closing part of the high pressure gate valve is a wedge, and the motion direction of the wedge is perpendicular to that of the fluid. Gate valves are used to shut off the flow of liquids rather than for flow regulation. Characteristics of High Pressure Gate Valves...

Ball Valve Maintenance through Grease Injection Before Installation

Before installation, the ball valve must be maintained through grease injection. The internal leakage only occurs at the valve seat and the O-ring of the valve seat. Damage and deformation of the valve seat during assembly, foreign matter in the seal groove (the internal seal groove), and damage of...

Seal Forms of Valves

Before the valve is out of plant, it has to undergo many tests. The sealing performance test is one of them, and the sealing performance is one of the important indices to check whether the valve is qualified or not. So, how many seal forms of the valve are there? No matter pneumatic ball...

What are the Classifications of Electric Valves and how to Choose?

The electric valve mainly consists of two parts: a valve body and a electric actuator. The latter can control the opening and closing of the former, thus realizing the control of pipeline fluids. Electric valves are widely used in agricultural irrigation, energy exploitation, pipeline transportation,...

Brief Introduction to Pneumatic Stainless Steel Ball Valves

Stainless steel ball valves can be opened and closed easily only by rotating 90 degrees. They can be used to control the various corrosive media flow such as water, steam, air, slurry, oil and liquid metal. These valves include pneumatic stainless steel ball valves, electric stainless steel ball valves,...

Difference between Trunnion Ball Valves and Floating Ball Valves

The ball valve is not bothered by frequent operation. It is with quick opening and closing, small fluid resistance, simple structure, small volume, light weight, and convenient maintenance. Besides, this valve boasts good sealing performance, no restriction of installation direction, arbitrary...