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Zhejiang Dayang Valve Co., Ltd

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There are many business opportunities in the valve market. Chinese enterprises are still the role of migrant workers.

In recent years, the hot valve market has been flowing more and more valve products produced in China, but the right to speak in the valve market is not in the hands of Chinese companies, but in the hands of foreign brands. In the valve market, Chinese enterprises still have no right to speak. The price is decided by others, and the rules are also decided by others.

09

2024

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04

Causes of fluid leakage

When the nitrogen pressure in the container is 100Kgf / cm2(9.8MPa) and the outside of the container is at an atmospheric pressure of 0.098MPa, the gas molecules in the container will escape into the low pressure side atmosphere, which involves escaping the leakage gap of the gas container per unit length at the same time. molecules, it is assumed that molecules with close-packed linear formations escape simultaneously within a unit length, but molecules outside the unit length per unit length, molecules colliding into the leakage gap are smaller than molecules escaping outwards from the container., and conflict with the outside world. In the gap between the molecules leaking from the container, the molecules in the container still leak to the outside of the gap.

25

2024

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04

Sometimes the sealing surface is bitten, the stem bite of the stem is scratched, and the threaded part of the stem is bitten

Bonding wear produces abrasive particles. The abrasive particles have a hardness higher than that of the two base metals and are pressed into the soft surface to scratch the hard surface. At the same time, the hard abrasive particles are also moved by the hard surface peaks of the soft surface. Then plow the soft surface. After the friction surface separates, the abrasive particle may discharge, but it may still be on a soft surface. When rubbed again, it will scratch the hard surface and plow deeper and deeper trenches on the softer surface until the soft surface in front of the hard particles cannot resist the moving force of the hard particles. It is cut to form a strip-shaped groove on a soft surface and a scratched surface on a hard surface.

25

2024

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04

Not flexible during valve opening and closing

During the opening and closing of the valve, it is sometimes felt that the jam is inflexible, and the opening and closing are very laborious. Sometimes it cannot be opened and closed with the normal opening and closing force, even after a certain distance is opened and closed, it cannot continue to open and close. There are some reasons for this failure, such as the valve stem and other parts are stuck, such as the packing gland is tilted and hit the valve stem, the second is that the packing is not installed correctly or pressed too tightly, followed by the valve stem and other parts or bite Dead, and no lubricant is added where the lubricant is added. To prevent such malfunctions, first avoid paper jams, loosen the packing correctly, install the packing correctly, and apply the appropriate lubricant to the place where the lubricant is applied.

25

2024

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04

Gate valve installation and use

1. gate valve is a block valve, the sealing performance is not as good as the stop valve. The main "duty" of the gate valve is to "cut off the flow", as well as to a small resistance: "freewheeling". It should not be used to adjust the flow and pressure of the medium, such as long-term adjustment, the sealing surface is easy to be washed and worn by the medium, affecting the sealing performance. The temperature and pressure of the medium of the gate valve should be paid attention to the reliability of the use. At high temperature and high pressure, the gate may die due to temperature changes, and the non-sealing phenomenon is easy to occur due to uneven temperature of the medium. Wedge type but the gate valve is particularly obvious.

22

2024

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04

What is the difference between cast iron valves and cast steel valves

The main difference between cast iron and iron steel valves is that the carbon content is different, and the carbon content directly affects the strength and plasticity of steel. Carbon steel is also called carbon steel, iron-carbon alloy with carbon content less than 2% WC. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus. According to the purpose, carbon steel can be divided into three types: carbon structural steel, carbon tool steel and easy-cutting structural steel. Carbon structural steel is divided into building structural steel and machine manufacturing structural steel. According to the carbon content, carbon steel can be divided into low carbon steel (WC≤ 0.25%), medium carbon steel (WC0.25%-0.6%) and high carbon steel (WC 0.6%) According to the content of phosphorus and sulfur, carbon steel can be divided into ordinary carbon steel (high phosphorus and sulfur), carbon steel (low phosphorus and sulfur) and steel (low phosphorus and sulfur). Generally, the higher the carbon content in carbon steel, the higher the hardness, the higher the strength, but the lower the plasticity.

22

2024

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04

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