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What characteristics should a high quality gate valve have?
A high quality gate valve should have the following characteristics: ① Sealing performance The sealing performance of the valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium, which is the most important technical performance indicator of the valve. There are three sealing parts of the valve: the contact between the opening and closing parts and the sealing surface of the valve seat; Packing with the valve stem and stuffing box; The connection between the valve body and the valve cover. The leakage in the first place is called internal leakage, which is usually referred to as lax closing, which will affect the ability of the valve to cut off the medium. For cut-off valves, internal leakage is not allowed. The latter two leaks are called external leaks, that is, the medium leaks from inside the valve to outside the valve. Leakage will cause material loss, pollute the environment, and cause accidents in serious cases. For flammable and explosive, toxic or radioactive media, leakage is not allowed, so the valve must have reliable sealing performance. ② Action sensitivity and reliability Refers to the sensitivity of the valve to changes in medium...
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2024.03
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The most widely used valve – gate valve
Gate valve is one of the most commonly used opening and closing valves, using the seat (that is, the opening and closing part, in the valve the opening and closing part is called the seat or gate, and the cylinder is called the seat or gate seat) to dial (fully open) and cut off (fully closed) the medium in the pipeline. It is not allowed to be used as throttling, and it should be prevented from opening the seat in a small amount during use, because the mudstone of the high-speed flowing medium will accelerate the destruction of the sealing surface. The seat in the plane parallel to the gate seat channel center line for lifting movement, like the gate to cut off the medium in the oil circuit, so it is also called gate valve. Features of gate valve: ① Small flow resistance. The medium channel inside the valve is straight through, the medium flows in a straight line, and the flow resistance is small. ② Less effort when opening and closing. Compared with the stop valve, because whether it is open or closed, the direction of the seat movement is parallel to the direction of the medium flow....
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2024.03
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Why choose knife gate valve when the medium is mud?
Mud is a fluid medium with high particle content and high viscosity, which has high requirements on valves. In the process of handling mud, it is necessary to choose a valve that can effectively control the flow of fluid and prevent mud leakage. The knife gate valve is a valve that can meet these requirements.
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2024.02
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Analysis of causes of gate valve leakage
Gate valve is the most common industrial valve and is widely used in industrial fields such as petroleum, petrochemicals, power stations, long-distance pipelines and shipbuilding. As a kind of fluid control equipment, the opening and closing part of the gate valve is a gate plate. Through the up and down movement of the gate plate, the open and closed states are switched, thereby realizing the function of cutting off or connecting the medium in the pipeline. If the gate valve leaks, it can easily cause hidden dangers to pipelines, equipment and facilities, and even affect the safety of personnel and equipment.
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2024.02
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You don’t even know about gate valve
The opening and closing part of the gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.
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2024.01
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Why is the triple eccentric butterfly valve so popular?
The new triple eccentric structure design realizes zero friction, more stable performance, and longer sealing service life. The delicate design ensures that the butterfly valve can be opened and closed flexibly from low to high temperatures, and the sealing performance is excellent, which is fully in line with the sealing standard of zero leakage of the valve under severe working conditions.
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2024.01
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What are the main types of gate valves classified according to gate plates?
Generally, it is recommended when the usage conditions or requirements require reliable sealing performance, high pressure, high pressure cutoff (large pressure difference), low pressure cutoff (small pressure difference), low noise, cavitation and vaporization phenomena, high temperature medium, and low temperature (cryogenic). Wedge gate valve. Such as electric power industry, petroleum refining, petrochemical industry, offshore oil, water supply engineering and sewage treatment engineering in urban construction, chemical industry and other fields.
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2023.12
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What is the difference between hard seal butterfly valve and soft seal butterfly valve?
Soft sealing butterfly valve is suitable for bidirectional opening, closing and adjustment of ventilation and dust removal pipelines in water treatment, light industry, petroleum, chemical and other industries.
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2023.12
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Valve distribution and selection recommendations for urban drainage systems
Drainage valves are indispensable water industry products in urban drainage systems. Among them, the most widely used are various types of medium and low pressure valves, including various butterfly valves and gate valves. Others include ball valves, check valves, exhaust valves, plug valves, and diaphragms. Valves, pressure reducing valves, flow regulating valves, mud discharge valves, etc.
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2023.11
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What are the key points and taboos of gate valve installation?
During the installation process of gate valves, butterfly valves and other valves, the quality of the installation will directly affect the normal operation in the future, so you must pay attention to it. Installation taboo 1: Taboo: The main materials, equipment and products used in construction lack technical quality appraisal documents or product certificates that comply with current national or ministerial standards. Consequences: The quality of the project is unqualified, there are hidden dangers of accidents, it cannot be delivered on time, and must be reworked and repaired; resulting in delays in the construction period and increased investment in labor and materials. Measures: The main materials, equipment and products used in water supply, drainage and heating and sanitation projects should have technical quality appraisal documents or product certificates that comply with current standards issued by the state or the ministry; their product names, models, specifications, and national quality standards should be marked. Code number, date of manufacture, manufacturer’s name and location, factory product inspection certificate or code number. Installation taboo 2: Taboo: Failure to carry out necessary quality inspections according to regulations before valve installation. Consequences: During system operation, the valve switches are inflexible, closed tightly and water (steam) leaks...
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2023.11
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What is the difference between soft seal gate valve and hard seal gate valve?
Soft seal is the seal between metal and non-metal, and hard seal is the seal between metal and metal. Both soft seal gate valves and hard seal gate valves are made of sealing materials. The hard seal is precision machined from the valve seat material to ensure the accuracy of matching with the valve core (ball), usually stainless steel and copper. Soft seal means that the sealing material embedded on the valve seat is non-metallic material. Since the soft sealing material has a certain elasticity, the processing accuracy requirements will be lower than that of a hard seal.
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2023.11
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14 taboos in gate valve installation! But be careful!
Installing a gate valve is not an easy task. Do you know there are fourteen major taboos? What will be the consequences if these taboos are violated? How to solve it?
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2023.11
