Blowing device

The last edit to this post was made by lf7836 on 2011-3-7 at 16:06. In China, there are only 2 genuine manufacturers of blowing devices: Shanghai Xindong and Chengde Kroni. You can find me at: QQ723838410

Could you send me the information and contact details? Email: *ong718@sina.com Thank you.

This post was last edited by shakic on 2011-3-9 09:03. For blowing devices, please contact Shanghai Hongke Automation Instrument Co., Ltd. A blowing device (also known as a purging device) is a mechanical flow controller for low flow rates, typically composed of elements such as a glass float flow meter or metal tube float flow meter, a pressure reducing valve, a pressure gauge, a constant flow valve, pipes, and connectors. Whether it is a change in the supply pressure of the pipeline or a change in the output pressure, the automatic regulation function of the built-in diaphragm control valve (constant flow valve) ensures a constant flow rate output. With its unique constant-flow output characteristic, the blowing device can be used in conjunction with other instruments for flow measurement, as well as for measuring liquid levels, interfaces, density, etc. Its applications are extremely wide-ranging; aside from routine pipeline cleaning and flushing, in the petrochemical industry it is used to blow nitrogen into tanks under positive pressure (the N2 blowing method) to prevent oxidation and thus protect chemical materials, or to blow air into tanks under positive pressure in order to accelerate oxidation ； The N2 purging method is also commonly used in the steel industry to clean differential pressure devices such as orifice plates through back-purging, in order to protect these devices. This back-purging method is widely employed, especially in conditions and environments where there are not many corrosion-resistant materials available. The insufflation method offers unique advantages for detecting liquids that are highly viscous, corrosive, radioactive, crystalline, or contain solid impurities, in terms of measuring liquid level, interfaces, and density. For example, polystyrene, with a viscosity as high as 20,000 CP, can only have its liquid level measured using an insufflation device ； For another example, most non-contact instruments (such as ultrasonic and infrared ones) are unable to simultaneously measure the liquid level of the medium inside a device, keep the transducer at a distance from the device, and ensure long-term durability of the sensor; the blowing method measurement technique can overcome these shortcomings. The key equipment used in the blowing method is the blowing device (also known as the purging device). The blow-by flow meter (also known as a purge flow meter), which comes only with a needle valve and without a constant-flow valve, is suitable for use due to its low cost. It is best employed in various industrial machines or process pipelines for cleaning with air or nitrogen (such as in semiconductor equipment, machining machines, various analyzers, medical equipment, etc.), as well as for monitoring the flow rate of cooling water and purified water. Blowing devices (also known as purging devices), which include needle valves, constant-flow valves, etc., are devices that are therefore relatively expensive; their performance and capabilities are superior to those of blowing flow meters. They are most suitable for use in special conditions such as hazardous environments or high-pressure situations (e.g., in vaporization furnaces) for backwashing with air or nitrogen. They serve to protect differential pressure equipment and chemical materials, accelerate the oxidation of certain materials, and are used for testing liquids that are highly viscous, corrosive, radioactive, or contain solid impurities. To reduce measurement errors in a purging method measurement system, the flow rate of the purging fluid must be constant. The purging flow rate should be selected based on the type of purging fluid, the properties of the medium being measured, and the measurement requirements.