Hot Hardware Knowledge: methods of valve repair

Valve repair there are two: First, preventive maintenance, the main control valve means in order to ensure reliable operation, and in the absence of failure to take preventive maintenance measures, including control valve installation and use in the field taken by the a series of preventive measures; Second, failure of maintenance, control valve that is the case in the failure to meet operating requirements can not be a series of maintenance work carried out, under normal circumstances be completed in the workshop, special circumstances may also be directly in the pipeline maintenance.
1 preventive maintenance
Preventive maintenance is the failure of the valve prior to scheduled maintenance, can be understood as routine maintenance, usually includes the following work.
Stress Relief 1.1
Pipeline as combination or improper installation will produce various types of stress, such as high temperature thermal stress generated by the media, the uneven tightening force when installing the stress caused by man-made some of the collision caused by a control valve and pipe stress and so on. The stress in the control valve and the pipeline, it is easy to affect the performance of control valve, and in severe adjustment will affect the system itself, leading to deformation of the stem and the guides and valve seat can not be aligned center; for the split valve valve body, may cause the body flange disengage; stress also may cause seat leakage. Therefore, to avoid or at any time must ensure that eliminate stress, the stress-oriented place away from the valve.
1.2 Check the support case
Best place to install the valve stem is to make the trip over the direction of the executive body and the body in a vertical plane. If the valve must be installed in the horizontal position of the stem, or stem the movement direction of a certain angle with the horizontal when the implementing agencies should be propped up so that each valve components are in a natural state. If you do not support or additional support may result in additional improper valve stem and the seat of the different heart, prone to change or make poor packing leakage and other faults. Even if the valve has a fixed and support measures must also be checked regularly, usually 2 to 3 months, check again.
1.3 remove or prevent entry of foreign matter
Valve should always check whether the connection pipe rust, welding slag, dirt, etc., it is found should be promptly removed. If the control valve and the pipeline to the accumulation of foreign matter, consider the upstream side of the control valve is easy to install filtering devices. In the process easy medium hard debris into the occasion, be sure to install a permanent filter. Because the valve is closed, the small piece of rust or welding slag abrasive enough to undermine the well-seat sealing surface, Moreover, the dirt will also cause valve core and valve seat wear, affecting its normal operation.
1.4 Check the gas supply and power supply on a regular basis
Gas source is a key driver of energy one of the valve. Pneumatic control valve of the membrane chamber, while not depleting the air, but if the air supply system contains water, oil and other impurities will cause valve positioners, actuators and other accessories following the blockage and failure. Must periodically check gas source and the power to ensure that air supply is clean, dry, power and reliable.
1.5 regular maintenance and refueling
Fillers and oiling after use in the short term need to re-adjust. Number of occasions to dust around the stem with a protective plastic or rubber sleeve and a guide part of the stuffing box, corrosive gas or liquid droplets exist where special protection measures to be adopted, the general wrap valve bags with a preservative, but Note that the operation can not affect it. In a fire resistance requirement, a special fire-resistant coatings can be used, set fire bags and other methods, fire bags of materials containing multi-layer ceramic fiber or glass fiber.
1.6 Transport and storage
Valve as required in the assembly and paint loaded actuator, the hand wheel, positioning devices and other accessories later, in order to prevent foreign substances into the control valve, control valve connected all the air interface to be blocked, the connection flange fitted with protective cover , pay attention to the various connecting parts, such as inlet valve positioner, actuator interface state. Any outstanding fragile accessories, such as oiling and potentiometer gauges, connectors should be removed, and the control valve is packaged separately and with transportation. Application-specific valve bracket to prevent loosening, to ensure that the overall vertical position or horizontal position. If long-distance transport, shipping is best to use strong wooden cases.
Keeping control valve, do not put in the sensitive parts of the valve support, such as valve positioners, valve stem, etc.. The environmental conditions of transport and storage should meet the product specification requirements. Storage area is best not to carry out other operations, can not be avoided, we must be careful not to touch the valve. Also avoid places by sand, dust, rain and other adverse conditions, the impact, if no suitable sites, in storage before the control valve must be installed in the moisture-proof bag, or on a similar container.
Check the safe operation of 1.7
Dangerous places in the explosive used in valves and related accessories shall be inspected for safe operation, for example, closures are tightened, the operation of barriers, such as power supply, control valves and related accessories to ensure safe operation.
2 Failure of maintenance
Valve can not operate or can not meet operational requirements, has failed to explain the need for fault repair. Not sure cause of failure in the case, according to the following general steps.

2.1 cleansing
To a faulty control valve from the pipeline dismantled after the first job is to repair the valve for thorough cleansing. Process fluid control valve easily contaminated, if the process medium is corrosive, explosive, radioactive, then the human body are harmful, we must use special methods to be parts of the process medium soaked in clean water.

China National Materials: 30 billion to build a production base in western New Materials

Recently, the China National Materials Group Co., Ltd. and Chengdu Municipal Government signed a Materials Group in Chengdu, new materials production base in the western strategic cooperation agreement, then, the base of the start-up projects an annual output of 100,000 polysilicon ingots quartz ceramic crucible manufacturing line construction . Under the agreement, National Materials Group and affiliated companies located in Xinjin County in Chengdu, the new materials industry 3.0 billion investment in functional areas, focusing on composite materials, artificial crystals, industrial ceramics fiber, glass fiber and other new materials development and production.

Sichuan Provincial Committee and Party Secretary Li Chengdu City, Chengdu Municipal Committee Liu Chao, Bai Gang, vice mayor of Chengdu, National Materials Group chairman Tan Zhongming, general manager Liu Zhijiang attend relevant signing and groundbreaking ceremony.

Do panic! The main force is still diving? Stuck with the stock is likely to have saved! March the stock market changes are likely to occur? Tug of war hidden behind the movement of funds!

During the meeting, Li said the city, in the years based on western development, Chengdu has achieved rapid economic and social development has entered a period of fast development. At present, Chengdu, is struggling to build up the world of modern garden city orientation and goal to achieve this goal, there must be enough industry support, particularly to build and improve the modern industrial system, one of which is to vigorously promote focused strategies such as new materials accelerate the development of new industries. Materials Group is a large central enterprises, is the only non-metallic materials in a series of core technology and industry innovation system, well-known complete enterprise group, signed the cooperation agreement with Chengdu, Chengdu is the recognition and future prospects of economic development support, will effectively promote accelerated development of new materials industry of Chengdu, Chengdu municipal government will actively implement the agreement, as always, make the service work together to enlarge and strengthen the new materials industry of Chengdu to promote greater development of both sides.

Tan Zhongming said that the National Materials Group is very optimistic about the new round of Chengdu in the western development prospects will be signed this agreement as an opportunity to conscientiously implement the national industrial policy, in accordance with the layout of Chengdu’s economic development, development of scientific and reasonable development plan, the full play talent, technology, management, capital and other advantages, and increase the support of the Group companies in Chengdu, focus on the development of new energy, new materials industry, active in social and economic development in Chengdu and make due contributions, I believe that the National Materials Group and Chengdu City of cooperation under this kind of flower, win tomorrow will bear fruit.

Sinoma Advanced Materials Group Materials Co., Ltd. belongs to the quartz crucible project-based first phase of the project, the first phase investment of 2.2 billion, scheduled for January 31, 2012, 50000 quartz crucible production line put into operation.

Materials Group is the direct management of State-central enterprises, is the only non-metallic materials in the industry and complete a series of core technology innovation system, scientific research, design, manufacturing, construction, international trade in one of the innovative, International type, the value of enterprise groups. Materials Group of the State Council the first batch of 56 large enterprise groups, one pilot in the national plan to implement single row, for many years among the top 500 Chinese enterprises in technological innovation, strong, with investment, research and development, technology, manufacturing, project contracting , personnel and other aspects of competitive advantage. As of the end of 2010, with total assets over 76 billion yuan, sales income of more than 500 billion yuan, total profit of more than 4.5 billion yuan.

Introduce the mechanical properties of textile fibers

The mechanical properties of textile fibers include fiber strength, elongation, elasticity, abrasion resistance, modulus of elasticity.
Fiber strength: fiber strength is the ability of fiber resistance to external damage, which largely determine the durability of the textile goods.
Fiber strength is the absolute strength fibers to said fibers in a row it is under increasing load until fracture can bear the maximum load. Lecturer in units of its statutory Newton (N) or PCT Newton (cN). Over the past practice of using chocolate or kilograms force said.
Fiber strength with the thickness of fiber is related to the different thickness of the fiber so absolutely not comparable strength, so often used to indicate the relative strength of the fiber strength. Relative intensity is the unit linear density (per special or every once) fibers can bear the greatest tension. Legal units of measurement for the cow / special (N / tex), or determining cattle / Special (cN / tex). Over the past practice of using Chris / Dan said.

Ceramic Fiber , Glass Fiber, Dusted Asbestos , Carbon Fiber
Elastic fibers: fiber and its products in the processing and use, should be subjected to external forces, and generate a corresponding deformation. When the external forces removed, the fiber part of the recoverable deformation, while the other part of the deformation is not recovered. This characteristic of the fiber can be deformed into fibers into three parts, namely, when the external force can be resumed immediately after the removal of this part of the elastic deformation of said emergency; when the force removed, can be slow to recover this part of the deformation said the slow elastic deformation; when the force removed, can not restore this part of the deformation of said plastic deformation.
Elastic fiber refers to fiber deformation recovery. That the size of the common indicators of fiber elastic fiber elastic recovery is also known as spring rate. It is urgent elastic deformation and elastic deformation of a certain period of slow deformation of the percentage of the total.
Elastic recovery rate of the fiber, the fiber with good elasticity, deformation and strong recovery. Fiber with good elasticity, good dimensional stability of textile, the process of taking the easy wrinkle, and more wearable. Such as: polyester has excellent flexibility, and its clothing is made with crisp, wear characteristics.
The wear resistance of fiber: fiber and its products in the processing and actual use, due to the constant friction caused by wear and tear experienced. The wear resistance of fiber refers to fiber external abrasion resistance performance.
Fiber abrasion fastness its textile products are closely related. Wear clothing with the merits of the fabric is an important indicator of wearability. Wear resistance of the fiber and fiber molecular structure, supramolecular structure, elongation, elasticity and other factors. Common level of fiber wear the following order:
Nylon> PP> PVA> Polyethylene> polyester> Acrylic> polyvinyl chloride fiber> wool> silk> cotton> linen> prosperity fiber> copper ammonia fiber> rayon fibers> acetate> glass fiber.
The elastic modulus of fiber: fiber elastic modulus, also known as “initial modulus – it is the start of a tensile curve of the straight part of the stress and strain ratio. In the actual calculation, is generally preferable to extend the load elongation curve rate of 1% of a long point to obtain the elastic modulus of fiber.
The size of the elastic modulus fibers, said fibers under load in a small degree of difficulty, which reflects the rigidity of the fiber, and is closely related with the performance of the fabric. When other conditions are the same, the fiber elastic modulus, the fabric stiffness; the other hand, elastic modulus is small, the fabric soft.
Twist is to make the yarn a relatively rotating the two sections, when the sliver of the original fiber axis parallel to the yarn into a helix tilt. Of short fibers, the twisting is mainly to improve the strength of the yarn. The filament yarn twisting can enhance the strength, but also have some effect. The amount of yarn twist and the twist in the yarn in the fabric and twist to the match, the appearance and performance of the product has a greater impact.
Twisting nature of the indicators are: that the degree of twist twisting, twisting the twist factor and that the direction of twist.
Filament yarn twist angle of twist for a twist to reverse the circle. Unit length of yarn twist within the twist a few said. China’s cotton twist yarn with special number system, which uses a 10cm length of yarn, said the number of twist; combed yarn and filament count is the metric system of twist, that is, the twist per meter number representation; In addition, with the number of twist per inch count, said the British system of twist.
Twist factor can not be used to compare the different thickness of the twist yarn twist level, as the same twist, coarse yarn greater than the tilt of its fiber thin gauze. In actual production, the twist factor used to represent the degree of twisting yarn. Twist factor is a combination of twisting the yarn linear density, said the relative degree of value, can be used to compare the thickness of the yarn twist level. According to the yarn twist factor and yarn twist and linear density calculations obtained.
Twist is the twist to the yarn twisting, the yarn of the fiber or yarn strands presented in the tilt direction. It was divided into two kinds of Z twist and S twist.Z-line is called the middle or backhand twist Z twist. Z twist yarn often used generally, the stock line with S twist.
Strand twist by twisting the twist has always said. For example, Z-twist yarn, first for the S twist twist, twist multiple strands twisted to Z, the twist to ZSZ said.
Twist yarn fabric look and feel of great influence, the use of warp and weft yarn twist and fabric to match, can be woven out of the look, feel and other styles of fabrics.
Hygroscopic textile fibers on the air, will continue the exchange of water vapor and air, that textile fibers absorbing the moisture in the air, but also continue to release water vapor into the air. Textile fibers to absorb or release water vapor in the performance of moisture known as fiber.
Hygroscopic textile fibers is an important physical properties of textile fibers is one. The size of hygroscopic textile fibers form the textile fiber size, weight, physical and mechanical properties have some effect, thus affecting the processing and performance. Moisture absorption capacity of textile fibers also directly affect the size of the fabric take comfort level. Moisture absorption capacity of the fiber is easy to absorb a large human sweat to regulate body temperature, nausea feeling to lift the wet, so people feel comfortable. So in commercial trade, fiber properties, the choice of textile processing and textile fibers in the moisture absorption should pay attention.
In the common textile fibers, wool, linen, viscose fiber, silk, cotton, and other moisture resistant and moisture absorption capacity of synthetic fibers are generally poor, in which the moisture absorption capacity of PVA slightly better and nylon, acrylic or worse, worse polyester , polypropylene and polyvinyl chloride fiber is almost no moisture absorption. Currently, often the poor moisture absorption ability of synthetic fibers and natural fiber or viscose fibers, to improve the fabric of the moisture capacity.
Moisture absorption in fiber, in addition to moisture absorption, the absorbent fiber material is also comfortable with taking the fabric is closely related. Absorbent fiber is the fiber sorption properties of liquid water. People in the activities generated by water vapor and sweat, the main leader of Moisture Absorption and water absorption, the absorption and dissipates, so people feel comfortable. In general, mainly due to rain coat soaked, so choose a small absorbent fiber material for the coat; underwear are mainly due to the non-dominant body evaporation and sweat soaked, so to choose a large moisture and water absorption fiber materials for underwear.

Jiangsu Jiuding high-elastic fiber glass complete the drawing of special test

“Currently, we are self-developed high elastic modulus of glass fiber has completed 400 species of small direct melting holes in the test, will enter small series production stage. ” Jiuding New Material Co., Ltd. in Jiangsu Province, Jiang Hu technical consultant, said the “new Species developed high elastic modulus of glass fiber technology innovation in the traditional, non-B, E, CFC-free and achieve the environmentally friendly production, which will break on the high modulus fiberglass foreign monopoly, the company in the ‘second five’ Gain an advantage in development. ”

Species of high elastic modulus of glass fiber, is the wind power industry chain and key material, the manufacturing MW-class wind turbine blades reinforced material. Core technology has been monopolized by foreign countries, China’s manufacturing MW-class wind turbine blades of glass fiber mainly relied on imports. From formulation design, material selection, melting and molding technology to solve problems and many other aspects of the development has a higher modulus and strength of glass fiber, to promote non-B, E, CFC-free ingredients and achieve environment-friendly, large-scale production, Alleged price, a national “five-second” wind power industry, an important development.

Nearly 3 years, to build around the new material Jiuding special high strength glass fiber technology industry chain and its products, special high temperature glass fiber technology industry chain and its products, special high-modulus glass fiber and composite material technology of wind power industrial chain and large-scale Fiberglass composite material component technology development direction of the industry chain of four, the organization R & D projects to develop and master a lot of new technology, processes and new products.

End of the year, the company independently developed high-elastic model species will reach an annual output of glass fiber size of 3 million tons, as a glass deep processing enterprises, “Twelfth Five-Year ” period, the new material will be enhanced Jiuding fiberglass products enterprise development, Strengthen its research and development capabilities at the same time, research institutes and university cooperation, actively carry out international cooperation projects, in the deep processing of glass continued to achieve leading, in the special fiber products, rapid development, by 2015, annual production value of 3.0 billion .

Sinoma Building in Chengdu and other western glass production base for new materials

Chengdu, signed yesterday with the Materials Group of new materials production base in the western strategic cooperation agreement. Under the agreement, National Materials Group will feature new material industry in Chengdu area invest 30 billion yuan to build its production base in the western new material, focusing on composite materials, artificial crystals, industrial ceramics, glass fiber and other new materials development and production. Provincial Committee and Party Secretary Li City, met with the National Materials Group Chairman Tan Zhongming line, and together attended the ceremony.

Li City, said that in ten years on the basis of western development, Chengdu has achieved rapid economic and social development has entered a period of fast development. Currently, we are struggling to build up the world of modern garden city orientation and goals. Achieve this goal, there must be enough industry support, particularly to build and improve the modern industrial system, including a prominent focus is to vigorously promote the new materials, speed up the development of strategic new industries. Materials Group is a large central enterprises, is the only non-metallic materials in a series of core technology and industry innovation system, well-known integrity of enterprise groups, the cooperation agreement signed with the city, is the recognition of Chengdu and the future prospects of economic development support, will effectively promote accelerated development of new materials industry in Chengdu, which we are grateful, and will actively implement the agreement, as always, make the service work together to enlarge and strengthen the new materials industry of Chengdu to promote greater development of both .

Tan Zhongming meeting and signed in a long time to give the National Materials Group in Chengdu in Chengdu, enterprises and units of the strong support expressed his thanks. He said that Chengdu is a large central cities in western China in recent years, the economic community to achieve a healthy, rapid and harmonious development.

Materials Group is very optimistic about the new round of Chengdu in the western development prospects will be signing the agreement as an opportunity to seriously implement the national industrial policy, economic development, according to Chengdu, layout, development of scientific and rational development planning, give full play to talent, technology, management, capital and other advantages, to increase the support of the Group companies in Chengdu, focus on the development of new energy, new materials industry, and actively contribute to economic and social development of Chengdu, were co-planted flowers, the fruit of the same by the win-win situation.

Municipal Committee Liu Chao at the signing ceremony. Bai Gang, vice mayor, Liu Zhijiang National Materials Group General Manager, representing the two sides signed the agreement.

Today, by the Materials Group Co., Ltd. under the Advanced Materials business Sinoma 100,000 annual investment in quartz crucibles projects as the National Materials Group of Western New materials production base project will start construction in the first Xinjin County. It is reported that quartz crucible product features as an advanced ceramic materials, mainly for the manufacture of solar ingot production to support, a one-time use products, ingot, high demand, with great development prospects of exploitation.

Building Options: Choose bright closet Note the four elements

How to choose a good cabinet, industry sources pointed out that the time of purchase for consumers of the four elements:

1. Select well-known brands. When consumers choose the best option overall wardrobe higher brand awareness market, such as Sofia, Yishi Li U.S. and Australia.

2. To see whether the green sheet. Open the door or drawer smell, if there is a strong smell of sexual stimulation is mostly excessive levels of formaldehyde.

3. To see the manufacture of materials and pulley durability. Pulley manufacture and durability of materials and the life of a great relationship closet. It is understood that cabinet Park Mangrove Bay closet most exclusive patented design with glass fiber material pulley, imported steel bearings, and wear resistance in both stable and good.

4. See warranty card. During the warranty, the general warranty brand closet shall be not less than 5 years.