原文：
随着科学技术的不断发展，国内阀门产品市场，也在向高技术含量、高参数、耐强腐蚀、高寿命方向发展。根据对国内外阀门技术的分析和国内外阀门市场需求的分析，得出近年来各行业用阀及阀门行业高新技术发展趋势及投资方向，如下： 1． 石油、天然气井口装置用阀 石油、天然气井口装置用阀主要为符合美国API 6A标准的单闸板或双闸板、有导流孔或无导流孔的锻钢平行式闸阀、泥浆阀、角式节流阀（CHOKE阀）、先导式安全阀和止回阀。 这些阀门的公称压力级为API 2000psi、3000psi、5000psi、10000psi、15000psi、 20000psi；公称通径为DN46工程~228mm（113/16in~9in）；温度等级为K（-60~182℃）、L（-42~182℃）、P（-29~182℃）、R（室温）、S（-18~166℃）、T（-18~182℃）、U（-18~121℃）、V（2~121℃）；材料要求为ＡＡ、ＢＢ、ＣＣ、ＤＤ、ＥＥ、ＦＦ、ＨＨ；材料性能要求按36Ｋ、45Ｋ、60Ｋ、75Ｋ；产品技术要求按PSL1（产品规范等级1）、PSL２（产品规范等级２）、PSL３（产品规范等级３）、PSL４（产品规范等级４）。 2． 石油、天然气长输管线用阀 石油、天然气长输管线用阀主要为符合美国API 6D标准的单闸板或双闸板、有导流孔或无导流孔的锻钢平行式闸阀；锻钢或铸钢三体式、上装式或全焊接式固定球球阀；油密封或压力平衡式旋塞阀；旋启式或蝶式止回阀、通球止回阀；清管阀等。 这些阀门的公称压力级为CL150（PN2.0MPa）、CL300（PN5.0 MPa）、CL400（PN6.4MPa）、CL600（PN10.0MPa）、CL900（PN15.0MPa）、CL1500（PN25.0MPa）、CL2500（PN42.0MPa）；公称通径为DN50~1500mm（2in~60in）；耐火试验技术要求按ISO10497；阀门的压力试验按ISO5208。 3． 核电用阀 核电用阀门比常规的大型火力发电站用阀门其技术特点和要求要高。阀类一般有闸阀、截止阀、止回阀、蝶阀、安全阀、主蒸汽隔离阀、球阀、隔膜阀、减压阀和控制阀等；具有代表性阀门的{zg}技术参数为：{zd0}口径DN1200 mm（核3级的蝶阀）、DN800 mm（核2级的主蒸汽隔离阀）、DN350 mm（核1级的主回路闸阀）；{zg}压力：约1500磅级；{zg}温度：约350℃；介质：冷却剂（硼化水）等。生产核级阀门产品规定要求：通常按核行业标准EJ、美国ASME、IEEE标准及法国压水堆核岛机械设备设计和建造规则RCC-M等。 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、400 mm；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：DN100~800 mm；工作压力：PN2.5~45.0MPa；工作温度：200~500℃。

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译文：
With the continuous development of science and technology, the domestic valve market, and also to the high-tech, high-parameter, resistant to corrosion, high-life direction. Valve technology at home and abroad based on the analysis and the analysis of domestic and international market demand valve, obtained in recent years the use of valves and valve industry development trend of high-tech industry and investment direction, are as follows: 1. Oil, natural gas wellhead valves Oil, natural gas wellhead valves are mainly used in U.S. API 6A standard single gate or double plate, there is no diversion diversion holes or parallel hole forged gate valve, slurry valve, angle-type throttle (CHOKE valve), pilot operated relief valve and check valve. The valve nominal pressure level for the API 2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi; nominal diameter of DN46 works ~ 228mm (113/16in ~ 9in); temperature rating for the K (-60 ~ 182 ℃), L (-42 ~ 182 ℃), P (-29 ~ 182 ℃), R (room temperature), S (-18 ~ 166 ℃), T (-18 ~ 182 ℃), U (-18 ~ 121 ℃), V (2 ~ 121 ℃); material requirements for the AA, BB, CC, DD, EE, FF, HH; material performance requirements by 36K, 45K, 60K, 75K; product technical requirements by PSL1 (Product Specification Grade 1), PSL2 ( Product Specification Grade 2), PSL3 (product specification grade 3), PSL4 (product specification grade 4). 2. Oil, Gas Pipelines Valves Oil, Gas Pipelines in U.S. with the main valve API 6D standard single gate or double plate, there is no diversion diversion hole or holes parallel forged steel gate valve; forged steel or cast three-bodied, upload type or full welded ball valve fixed ball; oil seal or pressure balanced plug valves; Swing or butterfly valve, check valve, globe; pigging valve. The valve nominal pressure level for the CL150 (PN2.0MPa), CL300 (PN5.0 MPa), CL400 (PN6.4MPa), CL600 (PN10.0MPa), CL900 (PN15.0MPa), CL1500 (PN25.0MPa) , CL2500 (PN42.0MPa); nominal diameter of DN50 ~ 1500mm (2in ~ 60in); technical requirements for fire resistance test in accordance with ISO10497; valve pressure test in accordance with ISO5208. 3. Nuclear Valves Nuclear power than conventional valves large thermal power stations with their technical characteristics and requirements of the valve is higher. Valves generally are gate valve, globe valve, check valve, butterfly valve, safety valve, main steam isolation valves, ball valves, diaphragm valves, pressure reducing valves and control valves, etc.; the highest representative valve technical parameters: the maximum diameter DN1200 mm (nuclear three butterfly), DN800 mm (nuclear two main steam isolation valve), DN350 mm (nuclear one of the main circuit gate valve); maximum pressure: about 1,500 pounds level; maximum temperature: about 350 ℃; medium: the cooling agent (boride water). Production of nuclear grade valves specified requirements: usually by the nuclear industry standards EJ, U.S. ASME, IEEE standards and the French island of pressurized water reactor nuclear design and construction rules for mechanical equipment, RCC-M and so on. Nuclear power development with a specific type of valve, parameters are as follows: ⑴ no stuffing of the gate: a hydraulic-driven gate valve. The valve piston with its own pressure water to promote the open or closed, the valve nominal diameter: DN350, 400 mm; working pressure: PN17.5MPa; working temperature: 315 ℃. b fully enclosed electric valve. The valve should be closed using a special screen motor, through immersion in the work of planetary gear box to make opening and closing gate movement. The valve nominal diameter: DN100 ~ 800 mm; working pressure: PN2.5 ~ 45.0MPa; working temperature: 200 ~ 500 ℃.