Page 2 of Technical Articles for Valve Industry Service

Two-piece structure is the earliest infrastructure of ceramic valves. During the use, however, we found that this structure is not reasonable, so later we developed three-piece structure and it is often used on double seat valves. Now, we have a brief knowledge about the main structure of the ceramic...

When rubber seal butterfly valves are used to throttle the flow, improper measures will produce cavitation and make the rubber seat flake or damaged. To this end, metal sealing butterfly valves with smaller cavitation areas have been produced in the international community. In recent years, China has...

First, from the perspective of structure cost, solenoid valves have simple composition structure with an electromagnetic coil as the main component. And for their performance, solenoid valves can only play the switch function. Although the use of electric valves is very similar with solenoid valves,...

Application of oilfield valves Oilfield valves are widely used in chemical, petroleum, natural gas, power plants, coal mines, construction, steel, light industry, sewage treatment and other industries. Because there are often hard particles, fibrous dirt and other objects in the media, so oilfield valves,...

With high performance, wide scope, good security and other advantages, API safety valves have widely used in different industries. However, during the long-term using process, safety valves are inevitable to meet all kind of problems. And the following is the introduction about how to deal with these...

With the functions of diversion, cut-off, throttling, non-return and split-flow, valves, which are used to change the channel section and flow direction of medium, can control the pipelines in the fluid delivery system. From the simplest ones to the most complex automatic control valves, valves with...

As a modern classic work for butterfly valves, sanitary butterfly valve has become very popular among industries. So what are sanitary butterfly valves, and the characteristics?   With high-precision CNC lathes, the interchangeability of sanitary butterfly valves can be guaranteed, eliminating...

If you want to the Y-strainers have stable performance and long service life, you need to pay special attention to these following aspects:   1. Although the Y-strainers are closed, there are still media and pressure in the body. Before overhauling ball valves, you should first close the stop valve...

Ventilation butterfly valve is divided into manual transmission and electric transmission and its driving actuator can be drove by motor or turbine so that the disc can rotate freely within the range of 90 ° to achieve the opening and closing movement or regulating the flow of media.   Features...

Hydraulic control valve should be installed the filter and also should convenient for the requirements of pollution discharge.   Hydraulic control valve is a kind of valve body that wet itself by water instead of being lubricated by adding engine oil. If the main parts within the king valve are...

Eccentric semi-ball valve and flange valve belong to the same type of valve, but the difference is that the closure member of eccentric semi-ball valve is a sphere and this sphere can rotate around the center line of the body to achieve the open and close movement. Ball valves are mainly used for cutting,...

Two major points analyzing electric control butterfly valve installation:   1. Installation location, altitude and direction of import and export must comply with the design requirements. Pay attention to the medium flow direction which should be consistent with the body the direction of the arrow,...

For pneumatic control valves, gas pressure relief valve is a necessary accessory which used mainly to reduce the pressure of air to a stable value, so that the control valve can obtain stable gas power for regulation. However, if the output pressure exceeds the limited pressure, the pipeline will be...

Due to the wide application of electric butterfly valve, the service time inevitably influences its quality. However, is there a good way to maintain and protect them? Today, here we introduce about the relevant maintenance methods of electric butterfly valve.   1. Electric butterfly valve should...

For valve market distribution, the biggest user of valves is petrochemical industry, electric power department, metallurgy department, chemical industry and urban construction department mainly on the basis of the construction of the project.   It is analyzed that the main trend of valve products’...

Today's continuous progress in society economy and technology and constantly improvement of people's living standard promote the constantly upgrade of production technology. Thus, industrial production demand for various valve products is increasingly growing, for example, the sales of common...

In the process of using a high vacuum butterfly valve, it will be often affected by temperature. And the following is the simple analysis:   1. Influenced by high temperature After the relaxation of flange, bolts and gasket, the prestress of the bolts and the carrying capacity of flange connection...

Connecting lever butterfly valve is a form of butterfly valve’s structure, which is mainly used in smelting blast furnace hot blast stove system and preheating furnace system. And it is applied in flue valve, gas cut-off valve, burning gas valve, combustion air shut-off valve, cold blast valve,...

Problems of selector valve:  the valve can not reverse or reverse slowly, gas leakage, failures of solenoid pilot operated valves and so on.   1. The selector valve can not reverse or reverse slowly. This failure is generally because of the bad lubrication, stuck or damaged spring; the sliding...

Here are eleven major technical characteristics of fully welded ball valve if you want to know more about fully welded ball valve.   1. The body structure of fully welded ball valve is welded. Therefore, there is no external leakage phenomenon happening. 2. The seat of fully welded ball valve consists...

1. The main reason for this is the expensive maintenance fee, so the operating managers do not maintain ball valves. Or lacking of scientific management and preventive maintenance, the valve will have a failure in advance.   2. Wrong operation and maintenance will also cause the leakage.  ...

Here are some main tips for installing the pneumatic butterfly valve we should notice.   1. Before installation, check whether pneumatic butterfly valve has missing parts or not. Ensure that each part model is correct. And there are no other objects within valve and it is clog-free in solenoid...

1. The disc of safety valve doesn’t return back after the discharge. This is mainly because of the bent stem or the disc is out of position, so you should assemble it again.   2. The leakage problem of safety valve In normal working pressure, due to the dirt, there is leakage between disc...

There are so many aspects we need to note for spring safety valve installation. First of all, before installing safety valve, be sure to test the seal performance. If there is relief valve leakage or breakage of air cushion, it is needed to change immediately. Then, we can get the best use of it. ...

In China, multi-way valves are still in the process of research and development. So, compared with those valves which have been developed for a long period, multi-way valves will meet more troubles in normal use. The following is the analysis of these failures:   1. Noise caused by uneven pressure...

American standard safety valve in industrial production is used very frequently. This kind of safety valve has many advantages such as high cost-effectiveness, wide scope, as well as good safety protection. In addition, safety valve is also hard to avoid appearing some small faults in the long-term...

This technical article gives us brief introduction about the common failure and troubleshooting methods for electric drive butterfly valves.   Whether they are manual, pneumatic, hydraulic or electric, every part of these products should be strictly debugged before they leave the factory. When...

In this technical article we will introduce the reasons, preventive measures and solutions for handweel inflexibility of gate valves from several aspects.   The Main Reasons: 1. Bent stem. 2. Lack of surface accuracy. 3. Thread damage because of hard operation. 4. Lack or the failure of lubricant....

Advantages：   1. Plug valves are often used for operation, and it is convenient to open and close quickly. 2. Small fluid resistance. 3. Simple structure, relatively small size and light weight. And it is easy to be maintained. 4. Good sealing performance. 5. No limitation for the installation...

It can be divided into two parts to maintain control valve daily: patrol inspection and regular maintenance.   As for patrol inspection, please do these following works: 1. Check the supply energy (hydraulic oil or power) of control valve and its related accessories. 2. Check the system operation...

Ball valve serves mainly as cutting, distributing and changing the flow direction of medium. Ball valve is widely used in recent years as a new type of valve. It has the following advantages: 1. The fluid resistance is small, and its resistance coefficient is equal to the length of tubulation. 2. It...