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涨知识——真空阀门选用时要考虑几点要求
Knowledge Enlargement-Several Requirements to be Considered in the Selection of Vacuum Valves
一、根据工作压力有低真空阀门、高真空阀门和超高真空阀门。
According to the working pressure, there are low vacuum valves, high vacuum valves and ultra-high vacuum valves.
二、根据结构特点有蝶阀、球阀、隔膜阀、挡板阀、插板阀、角阀、直通阀、三通阀。
2. According to the structural characteristics, butterfly valves, ball valves, diaphragm valves, baffle valves, plug valves, angle valves, through valves, three-way valves.
三、根据传动原理有手动、气动、电动、电磁。一般气动是电磁先导、气缸执行动作的过程，也可用手控制先导阀气缸执行动作的过程。电动为手、电两用，当停电时可用手动进行操作。
3. According to the transmission principle, there are manual, pneumatic, electric and electromagnetic. Generally, pneumatics is the process of electromagnetic pilot and cylinder executing action. It can also be used to control the process of pilot valve cylinder executing action by hand. Electricity is used for both hand and electricity. It can be operated manually when power failure occurs.
四、根据材料有不锈钢、碳钢、铝合金为主体材料的阀门。
4. Valves made of stainless steel, carbon steel and aluminium alloy are the main materials according to the materials.