从整个良工阀门来看，首要选用闸阀、截止阀用作首要堵截阀门。近几年来跟着金属密封双偏疼及三偏疼蝶阀和金属密封球阀等新产品研制成功，在石油化工、电力、冶金等方面的选用也逐步增多，替代了一部分闸阀和截止阀。石油管道和天然气管道大部分用球阀和平板闸阀，便于清管。城市供水和供热系统中本来选用的闸阀和截止阀，有一部分已逐步被蝶阀和软密封闸阀所替代。在整个阀门中，跟着科学技术的不断发展，出现如下特点：
From the perspective of the whole Lianggong valve mall, gate valve and stop valve are mainly selected as the primary blocking valve. In recent years, with the successful development of new products such as metal sealed double bias and three bias butterfly valves and metal sealed ball valves, the selection in petrochemical, electric power and metallurgy has gradually increased, replacing some gate valves and stop valves. Most oil and natural gas pipelines use ball valves and flat gate valves to facilitate pigging. Some of the gate valves and globe valves originally selected in urban water supply and heating systems have been gradually replaced by butterfly valves and soft seal gate valves. In the whole valve shopping mall, with the continuous development of science and technology, the following characteristics appear:
1、蝶阀和球阀因为研制成金属密封构造后，其温度和压力规模得到了扩展，将逐步替代一部分闸阀和截止阀。
1. Butterfly valve and ball valve will gradually replace some gate valves and globe valves because their temperature and pressure scale have been expanded after they are developed into metal sealing structure.
2、对夹式止回阀，安装便利，体积小，也得到广泛选用，将替代一部分升降式止回阀和旋启式止回阀。
2. The wafer check valve has the advantages of convenient installation and small volume, and is also widely used. It will replace some lifting check valves and swing check valves.
3、大口径止回阀方面，缓闭蝶形止回阀将替代大口径旋启式止回阀。
3. In terms of large-diameter check valve, the slow closing butterfly check valve will replace the large-diameter swing check valve.
4、蒸汽疏水阀方面，自在浮球式以其背压高、漏汽量小和动作牢靠等特点将替代动作时噪声大和漏汽量大的圆盘式蒸汽疏水阀。
4. In terms of steam trap, the free floating ball type will replace the disc steam trap with high noise and large steam leakage due to its high back pressure, small steam leakage and reliable action.
5、电动设备将选用传感器和光电管构造的智能型电动设备，用于阀门的智能化操控，满意阀门程控、群控自动化系统的需求。
5. The intelligent electric equipment constructed by sensors and photocells will be selected for the electric equipment to be used for the intelligent control of the valve and meet the needs of the valve program control and group control automation system.
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