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原文
Hydraulic Control Valve Design chosen points (1) the application of engineering-type hydraulic control valve is the result of factory inspection, identification and complete a variety of technical information to meet the requirements of the product. (2) According to the functional requirements, select the valve type, according to pipeline medium, temperature, building standards and requirements for property owners to determine the parts of the valve body and seal materials. Body materials are commonly used in cast iron, copper and iron, copper, plastic and so on. Commonly used sealing surface and lining materials are copper alloy, plastic, steel, carbide, rubber and so on. Valves and piping material should match the material. (3) the valve nominal pressure of 0.6, 1.0, 1.6, 2.5 and 4.0MPa different levels, pipeline medium, the valve operating pressure should be less than nominal value. (4) engineering hydraulic control valve settings should have enough space for management, operation, installation and maintenance, and piping shall meet the requirements of the valve. (5) pipe flange connection should be used to connect the hydraulic control valve flange; pipeline connection using trench, trench should be used to connect the hydraulic control valve. (6) hydraulic control valves should be set in the medium one-way flow pipeline. (7) hydraulic control Fazhu arrow on the body the flow direction must be consistent with the piping system. (8) then the hydraulic control valve pipe should not have gas block, vapor lock phenomenon. The highest location in the pipe network segment should be set to automatically save gas exhaust valve. (9) valve mounted horizontally, the valve cover, valve stem should be facing up. Vertical installation, valve cover, valve stem should be facing outward. (10) should be done before installing the valve strength and leak test. (11) valve strength and leak test should meet the following requirements. A, the intensity of the test pressure for the valve nominal pressure of 1.5 times; B, the valve leak test pressure of 1.5 times the nominal pressure; C, test pressure in the test duration should remain unchanged, and the shell filling and sealing surface of the valve without leakage; D, valve test duration according to the table.
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译文：
（ 1 ）工程式中应用的水力控制阀是经过制造厂检验合格，各种标识齐全，技术资料符合要求的产品。（ 2 ）根据功能要求，选择阀门种类，再根据管道输送介质、温度、建筑标准和业主要要求等，确定阀门的阀体和密封部位的材质。常用的阀体材料有铸铁、铜铁、铜、塑料等。常用的密封面和衬里材料有铜合金、塑料、钢、硬质合金、橡胶等。阀体材料应与管道材料相匹配。（ 3 ）阀门的公称压力有 0.6 、 1.0 、 1.6 、 2.5 和 4.0MPa 等不同级别，管道输送的介质，其工作压力应小于阀门的公称压力值。（ 4 ）工程中水力控制阀的设置应当有足够的空间，以便管理、操作、安装和维修，并应符合管路对阀门的要求。（ 5 ）管路采用法兰连接时，应采用法兰连接的水力控制阀；管路采用沟槽式连接时，应采用沟槽式连接的水力控制阀。（ 6 ）水力控制阀应设置在介质单向流动的管路上。（ 7 ）水力控制阀主阀体上的箭头方向必须与管路系统流向一致。（ 8 ）接水力控制阀管段不应有气堵、气阻现象。在管网最高位置等存气段应设置自动排气阀。（ 9 ）阀门水平安装时，阀盖、阀杆应朝上。垂直安装时，阀盖、阀杆应朝外。（ 10 ）阀门安装前应做强度和严密性试验。（ 11 ）阀门的强度和严密性试验应符合以下规定。 A 、阀门的强度试验压力为公称压力的 1.5 倍 ; B 、阀门的严密性试验压力为公称压力的 1.5 倍； C 、试验压力在试验持续时间内应保持不变，且壳体填料及阀瓣密封面无渗漏； D 、阀门试验持续时间按上表。

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