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Installation and Maintenance Best Practices for Loose Flange Connections

Installation and Maintenance Best Practices for Loose Flange Connections

Apr 09,2024

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What Are Chemical Valves?

The chemical valve is an important accessory for controlling the flow of the medium on the chemical pipeline. For the detailed principle and structural cross-sectional view, please refer to the relevant data books. The valve consists of three parts: the valve body, the opening and closing mechanism, and the valve cover.


1. Chemical valves are valves specially designed for industrial system pipelines with complex working conditions

The requirements of chemical valves are higher than ordinary valves, because the medium used is corrosive medium, from simple chlor-alkali industry to large petrochemical pipelines, all have the characteristics of high temperature, high pressure, corrosion resistance, wear resistance, etc. Chemical valves under such harsh working conditions should follow the following three principles: first, you should understand the performance of the valve; second, you should master the steps and basis for selecting valves; third, you should follow the principles of selecting valves for the petroleum and chemical industries. The selection and use of chemical valves should be carried out in strict accordance with chemical standards.

2. Chemical valves have a wide range of applications and a large amount of consumption

Generally, a straight-through valve is used, and its flow resistance is small. Usually, it is used as a valve for shutting off and cutting off the medium. The valve that is easy to adjust the flow is used for controlling the flow. The plug valve and ball valve are more suitable for reversing and diverting. The sliding of the parts along the sealing surface with a wiping action valve is most suitable for media with suspended particles. Common chemical valves include ball valves, gate valves, globe valves, safety valves, plug valves, check valves, etc. The mainstream of chemical valve media contains chemical substances, and there are many acid and alkali corrosive media. The chemical valve material is mainly 304L and 316. The general medium chooses 304 as the main material, and the corrosive fluid combined with a variety of chemical substances uses alloy steel or fluorine-lined valves because these materials do not easily react with chemical liquids. So they are often used to produce types of valves used onboard ship.

3. Principles of selection of chemical valves

In the chemical industry, straight-through valves are generally selected because of their small flow resistance, and valves for shut-off and open media are usually selected. Such valves are easy to adjust the flow and are used as flow control. Ball valve and plug valve are suitable for reversing and diverting, and the sliding of the closing member along the sealing surface has a wiping effect, and this kind of valve is suitable for the medium with suspended particles. Usually, the chemical valves that we see more used are globe valves, ball valves, gate valves, safety valves, check valves, plug valves and so on. The mainstream of chemical valve media contains chemical substances, and most of them contain acid and alkali corrosive media.

MSTN offers a combination of high quality products and specialty valves designed to meet the requirements of different chemical and petrochemical industries. Used in organic (polymers, olefins, methanol) and inorganic bulk (fertilizers, chlorine and salt plants) and many other applications. We can supply a range of valves for almost all of these plants, including cryogenic globe valves, gate valves, ball valves and bellows seals. We also offer a wide range of design features and corrosion-resistant materials. Specialty materials in our valves include copper, titanium, Monel and Hastelloy for corrosive acids, sulfuric acid, ethylene dichloride, aromatic anhydrides, and more. Welcome to online consultation!

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