Technical Articles

Installation Instructions of Valves (Part One)

• Feb Thu, 2018
• Hits: 41

Directions and positions of valve installation Many valves such as globe valves, throttle valves, relief pressure valves and check valves have directional characteristics. If a throttle valve is installed...

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Choosing Valves Based on Different Functions

• Nov Mon, 2017
• Hits: 38

First, we need to master performance flow characteristics, temperature, pressure and flow rates of media, and then combine them with technology, operation, safety and other factors in order to choose...

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Three Easily Occurring Problems of Gate Valves

• Oct Fri, 2017
• Hits: 42

The disc of the gate valve is the gate, whose direction of movement is perpendicular to the flow direction of the fluid. The gate valve can only be fully opened and closed, and can not be used to...

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How to Inspect the Quality of Fully Welded Ball Valves?

• Oct Mon, 2017
• Hits: 23

Buried fully welded ball valves have been widely used in a variety of fields. Although there are many buried fully welded ball valves on the current valve market, the quality of them is greatly different....

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Performance Tests of Valves

• Oct Mon, 2017
• Hits: 42

Motion performance tests of manual valves Open the valve; increase the pressure of the valve cavity until the pressure reaches the required pressure of the test; close the valve with the specified torque;...

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Appearance Inspection Methods for Valves

• Sep Wed, 2017
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1. Inspect whether internal and external surfaces of valve bodies have defects such as sand holes, cracks, etc. 2. Inspect whether the valve seat is firmly connected with the valve body; whether the valve...

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Selection Steps of Valves

• Sep Wed, 2017
• Hits: 32

When we select the appropriate valves for the pipelines or the equipment, the following steps of selecting valves are supposed to be followed.   1. Determine valves' working conditions which...

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Selection Principles of Ball Valves’ Ball Types (Part Two)

• Aug Thu, 2017
• Hits: 29

The hemispherical and v-shaped ball The purpose of using the hemispherical ball for the ball valve is to reduce the weight of the ball as the internal part, so as to achieve the purpose...

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Selection Principles of Ball Valves’ Ball Types (Part One)

• Aug Fri, 2017
• Hits: 33

Ball valves can be classified into floating ball valves and trunnion ball valves due to the two types of their balls, that is, the floating balls and the fixed balls. Besides these two kinds of balls,...

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Characteristics and Selection Principles of Plug Valves

• Jul Thu, 2017
• Hits: 27

The plug valve can also be called the 90 degree rotary switch valve which has the best flow performance and the minimum fluid resistance next only to those of the ball valve. If the plug valves...

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Overlooked Selection Principles of Valves

• Jul Thu, 2017
• Hits: 39

The performance of the valve, the valve's material, the sealing structure and the driving device In order to meet the requirements of the process characteristics, operation and fluid...

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Selection Principles of Non-metallic Valve Seats’ or Clacks’ Materials and Valve Stem Packing

• Jun Sat, 2017
• Hits: 31

Selection principle of non-metallic valve seats' or clacks' materials For non-metallic sealed valves, non-metallic valve seats and valve clacks are one of the key factors affecting valve...

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Selection Principles of Valve Internal Parts’ Materials

• May Sat, 2017
• Hits: 30

API600 Standard gives the definition of a gate valve's internal parts, which refers to the valve stem, the sealing surface of the valve seat, the sealing surface of the valve plate, the upper...

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Advantages and Practical Applications of Double Block & Bleed Ball Valves

• May Mon, 2017
• Hits: 39

In petroleum, gas, petrochemical, electric power and other industries of harsh production conditions, pipelines and instrumentation valves often need to have the DBB function to meet the...

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The Structural Characteristics of Fully Welded Ball Valves

• May Sat, 2017
• Hits: 55

The Fully Welded Structure The ball valve body is made by welding 6 parts of forged shells after assembling them. The structure of a ball valve is compact and makes the ball valve an integral whole....

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Rising Stem Gate Valve & Non Rising Stem Gate Valve

• Feb Fri, 2017
• Hits: 40

According to different driving mode, rising stem gate valve implements opening or closing by using hand wheel drive the nut to make stem linearly up and down. Non rising stem gate valve is opened or closed...

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