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The Improvement in the Hard-seal Trunnion Ball Valve for the Coal Chemical Industry (Part One)

The Improvement in the Hard-seal Trunnion Ball Valve for the Coal Chemical Industry (Part One)

Abstract The optimization and improvement in the design of the partial structure of the hard-seal trunnion ball valve for the coal chemical industry is introduced, involving the static sealing structure of the valve seat and valve body, connection structure of the valve stem and sphere, fixed structure of the sphere pivot and upper and lower bearing structures. The improvement...

Main Factors Affecting the Sealing of the Valve

Main Factors Affecting the Sealing of the Valve

The following are the main factors affecting the sealing of the valve.   The sealing pair structure With the change of temperature or sealing force, the structure of the sealing pair will change, which will affect and change the force between the sealing pairs, thus impairing the sealing of the valve. It is necessary to choose seals with elastic deformation. At the same time, pay...

The Selection of Valve Sealing Surface Materials

The Selection of Valve Sealing Surface Materials

The sealing surface is the most critical working surface of the valve; the quality of sealing surfaces directly affects the service life of the valve; the material of the sealing surface is an important factor to ensure the quality of the sealing surface. The following factors should be considered during the selection of valve sealing surface materials. 1. Corrosion resistance The corrosion of...

Measures to Prevent Corrosion of Metal Valves

Measures to Prevent Corrosion of Metal Valves

1. Improve the machining technology and structure of valves. Measures to prevent corrosion should be considered from the beginning of valve design. A valve with reasonable structural design and correct machining technology will undoubtedly have a good effect on reducing the corrosion of valves. Therefore, the related departments should improve the valve parts which are...

Differences between the Three Kinds of PCS Ball Valves?

Differences between the Three Kinds of PCS Ball Valves?

The PCS ball valve comes in single piece, two piece or three piece designs. What are the differences between the three? The structure The one piece ball valve is composed of the ball, PTFE O-ring and lock nut. The diameter of the ball is slightly smaller than that of the pipe, which is similar to the wide ball valve. The two piece ball valve consists of two parts. Its sealing...

Valve Cleaning and Lubrication

Valve Cleaning and Lubrication

The purpose of valve maintenance is to ensure that the valve is clean and well-lubricated all the time. Besides, the purpose is to make sure the valve has complete parts and is in the normal operating state all the year round. Valve cleaning The valve surface, the trapezoidal thread of the valve stem and the stem nut, gears, worm gears, worms and other parts are prone to be stained...

Comparison Between Wafer-style and Flanged Butterfly Valves

Comparison Between Wafer-style and Flanged Butterfly Valves

Butterfly valves are not only widely used in general industry such as petroleum, gas, chemical industry and water treatment, but also used in the cooling water system of a thermal power station. The butterfly valve can be divided into wafer-style one and flanged one. For the flanged butterfly valve, flanges are set at both inlet and outlet ends of the valve body and they are connected...

Causes of Valve Leakage

Causes of Valve Leakage

Causes of internal leakage of valves during construction 1. Improper transportation and hoisting cause the overall damage of the valve, resulting in internal leakage of the valve. 2. Before the valve leaves the factory, drying and preservative treatment are not performed after the water pressure test is finished, leading to corrosion of the sealing surface and internal...

Technical Requirements for Valve Assembly

Technical Requirements for Valve Assembly

Valves are a kind of commonly used hardware products. There are certain technical requirements for valve assembly. Otherwise, the assembled valve cannot reflect its excellent performance. What are the technical requirements of valves before and during assembly? Technical requirements before valve assembly 1. According to processing requirements, some parts need to be polished,...

Types and Selection of Electric Valves

Types and Selection of Electric Valves

Types of electric valves The electric valve is a valve driven by electric energy and is mainly composed of the electric actuator and various valves. The electric valve is easy to use, and it can run when the switch is turned on, so it is the most commonly used automatic control valve. There are many types of electric valves, including electric control valves, electric ball valves,...

The Selection and Application of Butterfly Valves

The Selection and Application of Butterfly Valves

The butterfly valve is suitable for flow regulation. Because the pressure loss of butterfly valves in the pipeline is relatively large (it is about three times that of gate valves), the influence of the pressure loss on pipe systems should be fully considered when the butterfly valve is to be selected. Also, take into consideration the firmness of the disc bearing the pressure...

Structural Features and Pressure Test Methods of Plug Valves

Structural Features and Pressure Test Methods of Plug Valves

Structural features of plug valves Plug valves are valves with cylindrical or conically tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more passages through the plug, so that fluid can flow through the plug when the valve is...

Tips for Pneumatic Butterfly Valves

Tips for Pneumatic Butterfly Valves

Test and adjustment of pneumatic butterfly valves Whether manual, pneumatic, hydraulic or electric butterfly valves, all their parts have been strictly debugged before leaving the factory. When rechecking the sealing performance, users should evenly fix the inlet and outlet sides, close the butterfly valve, pressurize the inlet side, observe whether there is leakage at the outlet side,...

What is the Full Bore and the Reduced Bore Ball Valve

What is the Full Bore and the Reduced Bore Ball Valve

The nominal diameter is the general caliber of various pipes and pipe fittings. Pipes and pipe fittings with the same diameter can be connected with each other and have interchangeability. It is not the actual outer diameter or inner diameter of the pipe, though its value is close to or equal to the inner diameter of the pipe. In the process pipeline system, most valves are designed to limit...

Advantages of Bellows Seal Globe Valves

Advantages of Bellows Seal Globe Valves

The design of the bellows seal globe valve is better than that of the ordinary globe valve. So, what are the advantages of bellows seal globe valves compared with ordinary ones? 1. The bellows seal globe valve has no leakage and is applied to high-risk medium. 2. The common globe valve is sealed with packing, and a slide will occur between the valve stem and packing so that the valve is...

Application Prospect of Stainless Steel Valves

Application Prospect of Stainless Steel Valves

Stainless steel valves are used for the industrial application because of their outstanding advantages such as long service life, not easy to rust, and environmental protection. They have become the valve products that must be purchased by relative industries. Therefore, customers should ask the merchants to provide the production and factory certificates of the stainless...

How to Make a Longer Service Life of a Ball Valve

How to Make a Longer Service Life of a Ball Valve

A longer service life of a ball valve relies on the following factors:   1. Normal working conditions. 2. Maintain the temperature properly proportional to the pressure. 3. When the ball valve is closed, there is still pressurized fluid inside the valve body. Before disassembly, it is necessary to check the upstream and downstream sides of the ball valve to ensure that there is no pressure in...

How to Select Proper Valves According to Flow Characteristics?

How to Select Proper Valves According to Flow Characteristics?

The disc and the shape of the valve flow passage make the valve have certain flow characteristics, which must be taken into account when you select valves. 1. Valves for cutting off and starting the flow of media Generally, valves with small flow resistance and straight-through flow passage are selected. Downward closed valves (globe valves and plunger valves) are seldom used because of the tortuous...

Types of the Globe Valve

Types of the Globe Valve

There are three types of globe valves classified according to the type of body. 1. Z-body globe valve 2. Y-body globe valve 3. Angle globe valve design   Z-body globe valve Z-body type is the simplest valve design and most common type, beneficial to applications involving water flow. The name "Z-shaped" stems from the Z-shaped partition inside the globular body. The horizontally...

Difference between Globe Valves and Throttle Valves

Difference between Globe Valves and Throttle Valves

Globe valve, also called stop valve, is one of the most widely used valves. It is popular because of its durability, easy manufacture, convenient maintenance and low friction between sealing surfaces during opening and closing. It is not only suitable for medium and low pressures, but also suitable for high pressures. The working principle of the globe valve is to make the...