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Common connection modes of valves

Whether the connection mode between valve and pipeline or equipment is right or not will directly affect the probability of pipeline valve running, emitting, dripping and leaking. Common valve connection methods include: flange connection, clamp connection, butt welding connection, threaded connection, sleeve connection, clamp connection, self sealing connection, etc. Flange connection Flange connection is the valve body with flange at both ends, corresponding to the flange on the pipeline, and the flange is fixed by bolts and installed in the pipeline. Flange connection is the most commonly used connection form in valves. Flange has convex surface (RF), plane (FF), convex […]

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What is a pressure regulating valve?

What is a pressure regulating valve? Pressure regulating valve, also known as self balancing valve, flow control valve, flow controller, dynamic balancing valve and flow balancing valve, is an intuitive and simple flow regulating control device. The application of flow regulating valve in pipe network can directly set the flow according to the design. Under the action of water, the valve can automatically eliminate the flow deviation caused by the residual pressure head and pressure fluctuation of the pipeline, regardless of the system The function of the valve makes the flow regulation of the pipe network complete at one time, […]

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The principle of flange bolt hole positioning

ASME B16.5 has clear regulations on the number of bolt holes and bolt hole diameter of the flange. The number and diameter of flange bolt holes are different due to different flange pressure levels, but all types of flanges of the same pressure level are the same. The flange bolt holes are evenly distributed on the bolt hole diameter, and the number of holes is always an even number (4, 8, 12, 16, etc.). In the manufacture of prefabricated parts with flanges, the positioning of flange bolt holes is particularly important. Perhaps you will see the following sentence in a […]

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What is a valve electric device?

What is a valve electric device? Valve electric device is a device that uses electricity to drive opening and closing or regulating valves. The valve electric device is an indispensable driving device to realize valve program control, automatic control and remote control. Its movement process can be controlled by stroke, torque or axial thrust. The working characteristics and utilization of the valve electric device depend on the type of valve, the working specifications of the device and the position of the valve on the pipeline or equipment. Electric devices generally consist of the following parts: Special motor, characterized by strong […]

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Ten lessons that must be paid attention to in the process of mold heat treatment

When manufacturing mold parts, a heat treatment process is usually adopted in order to achieve the required hardness and strength. The metal heat treatment process is to change the surface or internal structure of the material and obtain the required performance by means of heating, heat preservation and cooling in the solid state of the metal material. However, in actual operation, it is often caused by failures rather than technical key problems caused by some small details that are not worth mentioning, and it is not a mistake in the specific application of the typical theories mentioned in the book. […]

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Serious mixed crystal after normalizing forging steel?

Importance of reasonable selection of forging temperature At the same time, it has a great influence on the microstructure after forging. If the initial forging temperature is too high, it will not only cause serious oxidation and decarburization, but also cause overheating and over burning, which will easily lead to coarse structure and even form stable overheated coarse structure. This kind of tissue is hereditary, and it is difficult to eliminate it by normal pretreatment. Coarse grains will reduce the plasticity and toughness of forgings, and the fatigue properties will decrease obviously. When the final forging temperature is low, the […]

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Processing technology of stainless steel head by rotary extrusion

The mechanism of the process of processing stainless steel heads by rotary extrusion is “high-speed rotation”. In detail, this process uses high-speed rotating workpieces under the action of tools to make the process materials of the stainless steel heads that need to be processed pass itself well. The hot plasticity of the steel is deformed to form a stainless steel head that needs to be processed. The following not only analyzes the formation mechanism of stainless steel materials, the selection of tool materials and geometric parameters in the process of processing stainless steel heads by rotary extrusion, but also introduces […]

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Study on the causes of valve internal leakage in oil pipeline and Its Solutions

Valves are very important to the whole oil pipeline system. Only by ensuring the smooth operation of the oil pipeline valves can the safety and reliability of oil and gas transportation be guaranteed. In general, valves may cause great damage in the process of installation and maintenance. Therefore, it is very necessary to study the causes ofinternal leakage of oil pipeline valves. At the same time, the consequences of accidents caused by internal leakage of valves will be very serious, which will bring huge economic losses to oil companies. Therefore, great attention must be paid. In general, during the operation […]

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The difference between one piece, two piece and three piece ball valve

What is a one piece ball valve? One piece ball valve is composed of ball, PTFE ring and lock nut. One plug can fix the ball. It is small in size, reliable in sealing, simple in structure and convenient in maintenance. One piece is of reduced diameter, and the actual flow diameter is smaller than the thread diameter. Advantages of one piece ball valve 1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe. 2. Simple structure, small volume and light weight. 3. It is compact and reliable. At present, […]

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Discussion on galvanic corrosion control measures for dissimilar metal flange ……

When the dissimilar metal flange connection of offshore oil and gas platform pipeline, the transmission of conductive and corrosive fluid will produce galvanic corrosion, which will lead to flange joint failure and leakage and other safety accidents. According to the standard of ISO 21457, the advantages and disadvantages of several control measures to reduce galvanic corrosion hazards and their applicability to offshore oil and gas platform topside pipelines are compared. Combined with the actual application of the project, two applicable measures, i.e., the insulation gasket assembly and the carbon steel flange sealing surface overlaying with corrosion-resistant alloy, are mainly discussed, […]

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