酸阀门
SOUR SERVICE VALVES

符合NACE标准MR0175 (1990版本）
TO MEET NACE STANDARD MR0175 (REV. 1990)

　　作为选择产品，Velan制造了全系列的符合NACE标准MR0175的阀门，如本样本所示。阀内件材料由用户根据经验针对处理原油时所应抵抗硫化物（酸气）的腐蚀的能力和所示的表格选定。
　　As an option Velan manufactures the complete range of valves shown in this catalog in compliance with NACE Standard MR0175. Trim materials must be selected by customers from table shown based on experience in corrosion resistance against sulphides (sour gas) found in processing crude oil.

阀门定向
VALVE ORIENTATION

　　虽然Velan认为阀门安装方向可以随意确定，但是最好能够使得阀杆位于阀门的上方。任何的偏差都只是一个妥协的方案。如果最终用户在安装方向上面临特殊的问题，可以与我们联系。
　　Velan advises that valves may be installed in a random orientation, but the preferred orientation is with the stem vertically above the valve. Any deviation from this is a compromise. If the end user has specific questions about orientation, they may contact Velan Engineering Department for recommendations.