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Knowledge of Needle valve

What is a Needle valve? Needle valve is a globe valve with a conical plug (needle) closing into a small seat. Used for flow metering and damping pressure fluctuations on instruments such as pressure gauges… Instrument isolating valves are often called needle valves. Needle valves are similar to globe valves. They’re used to start, stop, and regulate the flow rate within a pipeline. However, needle valves are designed differently. Unlike globe valves, which have a disc, needle valves have a long, tapered, needle-like point at the end of the valve stem. This is often referred to as the plunger. These […]

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Microcrack Nucleation and Propagation Investigation of Inconel 740H Alloy Unde……

Abstract: As a result of increasing energy demands and accelerated environmental problems, there is an urgent need to improve the thermal efficiency of ultra supercritical (USC) power plants. To achieve this goal, advanced ultra-supercritical (A-USC) technologies with the main steam temperature of 700~750 ℃ and pressure of 35 MPa have been developed quickly in recent years. One of the most promising candidate Ni-based superalloys for the main steam pipe of 700 ℃ ultra-supercritical coal-fired power plants is Inconel 740H, which is a modified version of Inconel 740 developed by Special Metals Corp (SMC). Compared with IN740, the Ti/Al ratio in […]

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Knowledge of ASTM a519

ASTM A519 specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished. The steel used in the mechanical tubing may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The seamless tubing is a tubular product made without a welded seam. It is usually manufactured by hot working steel, and if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions and properties. The tubes shall be furnished in the following shapes: round, square, […]

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Knowledge of knife gate valve

What is a knife gate valve? Knife gate valve is a valve having a narrow parallel gate with a shaped edge for cutting through glutenous media or slurries. Normally limited to low pressure, the gland usually seals directly onto the gate. Types of knife gate valves With the growth of the Internet, a lot of companies can now easily advertise and provide electronic catalogs for any product they produce. With the Internet as well, any consumer can freely provide any review for any item. A knife gate valve has not been left behind with this. A lot of valve manufacturers can successfully post […]

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Three-dimensional Grain and Grain Boundary Morphology and Size Distribution of……

Abstract: Three-dimensional characterization of grains and grain boundaries is significant to study the microstructure of polycrystalline materials, and is the key to advance the subject of three-dimensional materials science (3DMS). In this work, the technique of serial sectioning by mechanical polishing coupled with 3D electron backscatter diffraction (3D-EBSD) mapping was used to measure the microstructure of a 316L stainless steel in 3D. Volume of the collected 3D-EBSD microstructure is 600 μm×600 μm×257.5 μm, which is quite large to study the 3D microstructure of structural materials with conventional grain size (20~60 μm). Dream3D and in-house developed Matlab programs were used to […]

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Effects of Intercritical Annealing Temperature on the Tensile Behavior of Cold……

Abstract: Medium Mn steel is composed of sub-micron grained ferrite and austenite, the unstable austenite may transform to martensite during plastic straining. Although the mechanical properties of medium Mn steel could be easily tested by tensile test, it is quite difficult to directly measure the influences of different constituent phases on the tensile and work hardening behavior. Thus, at the present work, EBSD, TEM, XRD and a constitutive model based on dislocation density have been used to study the effects of intercritical annealing (IA) temperature on the tensile properties and work hardening behavior of a newly designed medium Mn steel, […]

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Knowledge of needle valves

What is a needle valve? A Needle Valve is a type of valve that has a small port and a threaded needle shaped plunger. The purpose of the valve is to allow precise regulated flow; however, these valves are generally used in the applications involving relatively lower flow rates. The Needle Valve controls the flow in both directions and thus it is also known as a bi-directional flow control valve. Needle valves are used in almost every industry where the flow rate is relatively at the lower sides. They are used for steam, oil, gas, air and chemical metering is […]

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Research on the Collaborative Effect of Plastic Deformation and Solution Treat……

Abstract: AISI 304 austenite stainless steel was applied extensively in the modern industry due to its good properties on mechanics and corrosion resistance. However, there is severe intergranular corrosion when the AISI 304 was working at the temperature 420~850 ℃ called sensitizing temperature. This phenomenon was more obvious with increase of strain. In addition, this effect can not be removed completely even with the heat treatment subsequently. In present work, the influence of solution treatment and plastic deformation on the intergranular corrosion property of AISI 304 was investigated. The specimens subjected to different strain were obtained by the uniaxial tensile […]

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Knowledge of industrial valves

What is an industrial valve? Industrial valve is a device that controls,regulates, obstructs the flow of fluid across pieline. Industrial valve is important and is a part of many different things in many different industries. The demands on industrial valves are rapidly increasing as the years goes by therefore more and more new players are becoming interested in venturing the production and manufacturing of this valves. Probably two of the major players in this industry are the Indians and the Chinese. Although reports surfaces of the increasing need for valves which is an essential part of the industrial production especially […]

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Knowledge of check valves

What is a gate valve? Check Valve, also known as a one-way valve or Check Valves. Pipeline used to prevent reflux of a fluid valve. So pipeline fluid can only make one-way flow of fluid when the clock back, the flap valve can be shut down automatically to prevent backflow. According structure can be divided into two categories : elevating and spin-Kai (or a shake-flap). Former perpendicular to the valve flap valve passageway movements with Valve are generally designed as a cut-off valve and valve common. The latter is a flap valve around the sealing surface for rotating movement, resistance […]

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