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What is a safety valve?

What is a safety valve? Safety valve is a special branch of valve family. Its particularity is that safety valve only plays the role of switch unlike other valves. More importantly, it plays a role in protecting the safety of equipment. Safety valve is in normal closed state under the action of external force. When the medium pressure in the equipment or pipeline rises above the prescribed value, it is a special valve that prevents the medium pressure in the pipeline or equipment from exceeding the prescribed value by discharging the medium outside the system. Safety valves belong to automatic […]

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Six Solutions for Flange Corrosion

The integrity of flange connection is very important for the pipeline system of conveying fluid. Whether it is the pipeline system for transporting chemical media (such as hydrocarbons) or the water supply pipeline, the leakage of flange connection will cause serious environmental and economic impact, and even may bring huge potential safety hazards. If flanges are exposed to corrosive environment or polluted industrial atmosphere without protective measures, the corrosion rate will be very fast. In addition, because of the complex geometry of flange connection, it is easy to cause gap corrosion between two flange surfaces and galvanic corrosion between different […]

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Flange pressure rating

What Is The Nominal Pressure Pn What Is Work Pressure What Is Design Pressure Test Pressure Relationship Flange Pressure Rating 1. What is the nominal pressure PN (MPa)? Reference values related to the pressure resistance of pipeline system components refer to the design pressures related to the mechanical strength of pipeline components. Nominal pressure is generally expressed in PN. (1) Nominal pressure – the compressive strength of the product at the base temperature, expressed in PN, in MPA. (2) Reference temperature: The reference temperature varies with different materials. For example, the reference temperature of steel is 250 degree C. (3) […]

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What is a diaphragm valve?

What is a diaphragm valve? A diaphragm valve is different in structure from the general valves. It is a new type of valve and a special type of shut-off valve widely used in various fields. Its opening and closing member is a diaphragm made of soft material. The inner cavity of the cover and the driving member are separated. Commonly used diaphragm valves are rubber-lined diaphragm valves, fluorine-lined diaphragm valves, unlined diaphragm valves, and plastic diaphragm valves. The diaphragm valve is provided with a flexible diaphragm or a combined diaphragm in the valve body and the valve cover, and the […]

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What Are Globe Valves?

What Are Globe Valves? Globe valves, also known as shutoff valves, belongs to forced sealing valves, so when the valves are closed, pressure must be exerted on the disc to force the sealing surface not to leak. When the medium enters the valve from below the disc, the resistance to be overcome by the operating force is the friction between the stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem is larger, otherwise the […]

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Why can’t stainless steel screws and nuts be used together?

We all know that self-tapping screws do not require nuts because they are born with cool and anti-loose skills. But you have heard that stainless steel screws cannot be used with nuts. This is why?  Why is your stainless steel fastener locked Precautions and methods to avoid locking Common problems and solutions in the use of stainless steel screws The reason why this is said is that, when the low temperature pipe flange is assembled, if it is fastened with stainless steel bolts and nuts, it is very easy to bite after a period of time. This is because after the screwing, the […]

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Selection and installation of safety valve

What is a safety valve? The safety valve used in pressure equipment, container or pipeline, as the overpressure protection device. When the equipment, container or piping within the pressure exceeds the allowable value, the valve automatically opens, then the whole amount of emissions, to prevent the equipment, container or piping within the pressure continues to rise; when the pressure is reduced to the specified value, the valve should be closed automatically in a timely manner, so as to protect the safe operation of equipment, container or piping. Nominal terms Classification of safety valves Selection of safety valve How to order […]

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What is a fastener?

What is a fastener? Fastener is a kind of mechanical parts used for fastening connection and widely used. Fasteners are widely used in various industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, dies, hydraulic and other industries. A variety of fasteners can be seen in machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical industry, instrumentation and supplies. They are the most widely used mechanical basic parts. Its characteristics are various varieties and specifications, different performance and uses, and the degree of standardization, serialization and generalization is also very high. Therefore, some people refer to a […]

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Cause Analysis of Valve Leakage

Valve leakage is generally divided into two types: external leakage and internal leakage. Internal leakage refers to the inadequate closure of the valve due to erosion and abrasion of the conveying medium, scratches on the sealing surface and other reasons, which can not completely prevent the conveying through after the valve is completely closed. Leakage generally refers to the defect of the valve body itself, improper sealing between flanged joints or connecting threads, resulting in the outflow or leakage of conveying media outside the valve body. Cause Analysis of Valve Leakage Cause Analysis of Valve Internal Leakage Solutions to Valve […]

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What are butterfly valves?

What are butterfly valves? Butterfly valve, also known as flip valve, is a simple structure control valve, which can be used for switch control of low-pressure pipeline media. Butterfly valve refers to a valve whose closing parts (disc or butterfly plate) are discs and rotate around the valve axis to open and close. Butterfly valves can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting off and throttling in the pipeline. The opening and closing part of butterfly valve is a disc-shaped […]

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