译文：
1．核电机组发展方向 据资料分析，在核电站的建设中，机组容量的发展方向，国外主要向130万、140万及150万千瓦方向发展。国内主要向80万、90万及100万方向发展。核电设备将向大型化、高参数、高性能方向发展。 2．核电阀门发展方向 随着核工业的发展，核电站设备大型化、高参数、高性能及可靠性、安全性的要求越来越高。这就要求核电阀门也能适应这种发展趋势。 核电用阀发展的具体类型、参数如下： ⑴无填料函的闸阀： a液压驱动闸阀。该阀借助自身压力水推动活塞开启或关闭，该阀公称通径：DN350、400mm；工作压力：PN17.5MPa；工作温度：315℃。 b全封闭型电动闸阀。该阀应采用特制的屏闭式电机，通过浸水工作的内行星减速机构使闸板作启闭运动。该阀公称通径：DN100~800mm；工作压力：PN2.5~45.0MPa；工作温度：200~500℃。 （注：上述两种无填料函闸阀优点：没有填料密封，避免了外漏点，同时，减少能耗。缺点：结构复杂、造价较高。） ⑵截止阀： 用于辅助管路上的截止阀。 该阀通常为三种结构，即填料式截止阀、波纹管式截止阀和金属膜片式截止阀。该阀介质为中等参数（中温、中压）的水和蒸汽；公称通径：DN10~150mm。 ⑶蝶阀： 用于冷却系统和安全壳内输送空气介质的系统中的蝶阀。该阀通常为三种结构，即同轴直连式衬胶蝶阀、偏心式金属密封蝶阀和双动式（蝶板在回转前先脱开密封面再回转）金属密封蝶阀。该阀公称通径：DN≤2500mm；工作压力：PN＜4.0MPa；工作温度：100~150℃。此外，用于风道系统中的快速关闭蝶阀，其公称通径：DN400~1200mm也列为发展的方向。 ⑷带探测器的先导式安全阀： 用于核岛系统中的带探测器的先导式安全阀。采用带探测器的先导式安全阀，可以根据压力与弹簧力平衡的敏感关系，来改变位置控制释放和加充介质的两个触点的原理，从结构上避免卡阻问题。该阀采用正作用式带弹簧预紧和波纹管密封的阀瓣结构，可以保证可靠的密封。该阀公称通径：DN600mm；工作压力：PN1.265MPa。 ⑸止回阀型隔离阀： 用于蒸汽系统的止回阀型隔离阀，其结构形状类似于升降式止回阀。该阀公称通径：DN64~800mm（21/2in~30in）；工作压力：PN1.0~42.0MPa（Class600~2500）；工作温度：-29~1050℃。 ⑹主蒸汽隔离阀 核岛和常规岛用主蒸汽隔离阀、主给水阀门，其公称通径：DN800mm；公称压力：40.0MPa；温度700℃； 此外，满足地震要求的安全阀、核燃料提取用的软硬密封高真空电磁阀、上装式核电球阀也是急需开发的核电阀门。

“ The parameters of nuclear power valve selection and the use and development direction ”是由提供的国际阀门新闻，译文仅供参考。另外，中国电动阀门网还提供相关产品搜索： 、 、、 、 等。

原文：
1. The direction of development of nuclear power units According to data analysis, in the nuclear power plant construction, the direction of development capacity of the units abroad mainly to the 1.3 million, 140 million and 1.5 million kilowatts direction. The major domestic to 80 million, 900,000 and 1 million directions. Nuclear power equipment will be large-scale, high-parameter, high-performance direction. 2. The direction of development of nuclear power valve As the nuclear industry, nuclear power plant equipment, large-scale, high-parameter, high performance and reliability, security, have become increasingly demanding. This requires that nuclear power valves can also adapt to this trend. The development of nuclear power with the specific type of valve, the parameters are as follows: ⑴ no stuffing of the valve: a hydraulic-driven gate valve. The valve piston with its own pressure water to promote open or closed, the valve Nominal diameter: DN350, 400mm; working pressure: PN17.5MPa; operating temperature: 315 ℃. b-wide closed electric valve. The valve should be closed using a special screen motor, through immersion in the work of planetary reducer for institutions to make damper open and close movement. The valve Nominal diameter: DN100 ~ 800mm; Working Pressure: PN2.5 ~ 45.0MPa; operating temperature: 200 ~ 500 ℃. (Note: The above two types of stuffing valve advantages: no packing seal to prevent the leakage points, while reducing power consumption. Disadvantages: complex structure, a higher cost.) ⑵ cut-off valve: The cut-off the road for the auxiliary control valve. The valve is usually three kinds of structures, namely, filler-type cut-off valve, bellows globe valve, and metal diaphragm valve. The valve medium medium parameters (medium temperature, medium pressure) of water and steam; Nominal diameter: DN10 ~ 150mm. ⑶ Butterfly: Containment for the cooling system and air transportation systems in the butterfly medium. The valve is usually three kinds of structures, namely, coaxial Direct Connect rubber lined butterfly valve, eccentric metal sealing butterfly valve and double-action (butterfly plate torn off before turning the sealing surface and then rotating) metal sealing butterfly valve. The valve Nominal Diameter: DN ≤ 2500mm; working pressure: PN <4.0mpa; operating="" temperature:="" 100="" ~="" 150="" ℃.="" in="" addition,="" the="" duct="" system="" for="" the="" rapid="" closure="" of="" butterfly,="" its="" nominal="" diameter:="" dn400="" ~="" 1200mm="" are="" also="" listed="" as="" the="" direction="" of="" development.="" ⑷="" with="" the="" detector="" pilot="" safety="" valve:="" for="" the="" nuclear="" island="" systems="" with="" a="" detector="" pilot="" safety="" valve.="" using="" the="" pilot-type="" safety="" valve="" with="" a="" detector="" may="" be="" based="" on="" pressure-sensitive="" balance="" between="" spring=""> to change the location of controlled-release and processing charge of the two contacts of the principle of media, from the structure to avoid jamming problems. The use of positive-action valve with a spring pre-tightening and bellows sealed valve flap structure, and can ensure a reliable seal. The valve DN: DN600mm; working pressure: PN1.265MPa. ⑸ valve-type isolation valve: Non-return valve for the steam system-type isolation valve, its structure and shape is similar to lift check valve. The valve Nominal Diameter: DN64 ~ 800mm (21/2in ~ 30in); working pressure: PN1.0 ~ 42.0MPa (Class600 ~ 2500); working temperature: -29 ~ 1050 ℃. ⑹ main steam isolation valve The nuclear island and conventional island with the main steam isolation valves, main water valve, its nominal diameter: DN800mm; Nominal pressure: 40.0MPa; temperature of 700 ℃; In addition, to meet the seismic requirements of the safety valve, fuel extraction software and hardware used in sealed high vacuum solenoid valves, coat-type nuclear power is also a much-needed development of nuclear power ball valves.