以下是JM系列机械阀旋钮型手动阀三口二位截止式机械阀的产品中英文介绍：

中文介绍： JM系列机械阀是一种性能可靠的气动控制元件，其中旋钮型手动阀三口二位截止式机械阀具有独特的优势。它采用直动式动作方式，工作介质为经40微米滤网过滤的空气，工作压力范围在0~0.8MPa，工作温度范围为0~70℃，能够适应多种工作环境。本体材质为铝合金，密封材质为NBR，既保证了阀的强度，又确保了良好的密封性能。其接管口径为1/4英寸，安装方便。该阀通过旋钮操作，旋转角度为90度，操作简便且具有记忆功能，可将“P”“R”口转换，常闭变为常通。它广泛应用于公共交通、轨道交通、电子行业、机械制造业、纺织行业、包装行业、医药行业等多个领域。

English Introduction： The JM series mechanical valve is a reliable pneumatic control component, among which the three-port two-position stop-type manual valve with a knob has unique advantages. It adopts a direct-acting method, with working medium being air filtered through a 40-micron filter mesh, a working pressure range of 0~0.8MPa, and a working temperature range of 0~70℃, making it adaptable to various working environments. The body material is aluminum alloy and the sealing material is NBR, ensuring both the strength of the valve and good sealing performance. The pipe connection diameter is 1/4 inch, which is easy to install. The valve is operated by a knob with a rotation angle of 90 degrees. It is easy to operate and has a memory function, allowing the conversion between the “P” and “R” ports, changing from normally closed to normally open. It is widely used in various fields such as public transportation, rail transit, electronics, machinery manufacturing, textile industry, packaging industry, and pharmaceutical industry.