Product Information of Nanfang hand operated gate valve valve chemical fiber
control valve produced by Nan Fang is mainly used in the following fields.With rich manufacturing experience and strong production capability, Nan Fang is able to provide professional solutions according to customers' actual needs.
Closely following the market trend, Nan Fang uses advanced production equipment and manufacturing technology to produce control valve. The product receives favors from the majority of customers for the high quality and favorable price.Nan Fang guarantees control valve to be high-quality by carrying out highly standardized production. Compared with other products in the same category, it has the following advantages.
Company Advantages 1. The production of Nanfang hand operated gate valve is carried out according to industry production standard. 2. The product is developed by industry experts, passing thousands of stability tests. 3. With such features as steel gate valves, hand operated gate valve has considerable practical and promotional value. 4. This product taps into impulsive purchasing habits and pushes shoppers to buy the merchandise because of its attractive nature.
Company Features 1. Hangzhou Fuyang Nan Fang Valve Industry Co., Ltd is designed to provide customers with the perfect experience of hand operated gate valve . 2. We have people coming from a diverse set of experiences and backgrounds. This empowers us to deliver outstanding results for our customers with their industry know-how. 3. We have a clear mission: to protect and advance our clients’ best interests. We strive to forge long-term relationships, and we nurture them by viewing our clients as partners in our mission. We have a significant commitment to our customer satisfaction. We also make the best practice decisions in every facet of our business.
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.