Product Information of Nanfang air operated ball valve supplier global oil refining
control valve can be applied to different industries, fields and scenes.Nan Fang is committed to producing quality control valve and providing comprehensive and reasonable solutions for customers.
Company Advantages 1. The creation of Nanfang ball valve control valve involves some advanced technologies. They include mechanical systems technology, automatic control technology, sensing technology, and servo-drive technology. 2. The product does not generate loud noise. The noise control technology has been applied in its development to absorb noises. 3. This product is hypoallergenic. In the production process, any allergens caused by crude material ingredients, dyestuff or chemical additives are removed. 4. air operated ball valve is widely appraised for its stable quality.
Company Features 1. Nanfang has made great achievements in the field of air operated ball valve . 2. Our manufacturing plant is equipped with up-to-date production facilities. They are imported from the United States, Japan, and Germany, which ensure the smooth progress of our production plan. 3. Sustainability is always a vital part of how we do business. We introduce an efficient process to reduce greenhouse gas emissions, energy consumption, solid landfill waste, and water consumption. We are doubling our effort in gearing toward green manufacturing. We streamline the production process that emphasizes the reduction of waste and less pollution. Since our foundation, we have established a corporate culture that focuses particular attention on the quality that will make customers smile.
In the past, the main consideration for control valve packing selection is the operating temperature of packing. When the temperature is lower than 200℃, use PTFE packing; When the temperature is higher than 200℃, the packing is graphite. Now, when selecting the packing, not only to consider the working temperature, but also to consider the affection of process control by the friction of packing, such as hysteresis, sealing quality, service life, and so on.The principle of choosing packing is to reduce the friction and prolong the service life as far as possible under the premise of ensuring the required level of leakage.For the friction of a graphite packing, it is much greater than that of a PTFE packing, so PTFE packing should be used as long as the temperature permits.Summarize the main points of packing structure design and application:1. Different packing boxes and packing structures are suitable for different applications. The correction selection of the packing box and packing structure, can reduce the friction and prolong the service life under the required sealing performance.2. In the packing structure, the packing layers and length are not the more than better usually packing length is 1.5 times the stem diameter.3. It is very important to improve the surface finish and surface accuracy of the stem and packing box. For PTFE packing, the finish of stem and the packing box is not enough, and it will reduce the sealing performance and cause increasing leakage;4. The design of the packing structure should be able to automatically adjust the compression force and compensate for the reduction of the compression force caused by wear, etc., so as to facilitate on-site maintenance and installation.5. The improper installation of the control valve will cause uneven friction, for example, when the horizontal installation, the stem dead weight will increase pressure on the lower line of packing, increase friction; And for the upper line of the packing, it has poor sealing performance due to the pressing force reduction.
Installation of NPS6 (DN150) soft seated ball valves with pneumatic actuator at a chemical factory.Soft seated ball valve, taking a rotation movement of 90 degrees, maintain a ball as its plug body with a round hole passing through its axis. The Nanfang soft seated ball valves take a main function of distribution, cutting off and transition of medium’s flowing. With a small rotation of 90 degrees and turning torque, soft seated ball valves share a well-performed sealing effect. Recently, the relevant development of soft seated ball valves has been endowed with the characteristics of flow throttling and controlling.Soft seated ball valves share such characteristics with tight configuration, stable sealing, and convenient repairing. The sealing surface of soft seated ball valves maintains a closing position between ball’s surfaces without any flushes by the mediums, employed in the working mediums of water, solvents, acids, gas and etc, as well as mediums under tough working environment such as oxygen, methane, ethylene and etc. The soft seated ball valves can share an integral structure or a combined type.