低温长轴针型阀

     DJ61Y低温高压针型阀的启闭件是塞形的阀瓣，密封面呈平面或锥面，阀瓣沿流体的中心线作直线运动。阀杆的运动形式，有升降杆式（阀杆升降，手轮不升降），也有升降旋转杆式（手轮与阀杆一起旋转升降，螺母设在阀体上）。DJ21Y低温高压针型阀只适用于全开和全关，也可以作调节和节流，可以在-196℃，42MPa的情况下正常工作。低温高压针型阀应用于气体液化设备、空分设备；天然气液化、储运设备；液态氧、氮、氩、氢、二氧化碳低温贮槽及槽车；变压吸附制氧、氮设备。

DJ61Y低温高压针型阀结构优点:

       1、结构简单，制造和维修比较方便；
       2、工作行程小，启闭时间短；
       3、密封性好，密封面间磨擦力小，寿命较大；
       4、流体阻力大，开启和关闭时所需力较大；
       5、不适用于带颗粒、粘度较大、易结焦的介质；
       6、调节性能较差。

低温长轴针型阀

低温长轴针型阀是专门为低温工况设计的具备较长阀杆的针型阀低温长轴针型阀主要适用于低温液态介质系统，像液氧、液氮、液氩等空分管路，液化天然气（LNG）装置，以及二氧化碳低温槽车等均可使用 。

低温长轴针型阀阀杆较长，其设计主要是为了避免因外部环境温度高致使阀杆传导热量，进而降低密封失效及介质汽化风险。其具备开关灵活、密封度好及耐压等特点 。阀体常采用深冷不锈钢等耐低温材料，防止低温下材料变脆影响使用性能 。密封填料选用浸渍聚四氟乙烯的石棉或柔性石墨等耐低温材料，在低温下稳定密封 。通常，其工作温度可低至 -196℃，公称通径一般在 DN6 至 DN20 之间，设计压力可达 4.0MPa 左右 。

The low-temperature extended stem needle valve is mainly applicable to low-temperature liquid medium systems, such as air separation pipelines of liquid oxygen, liquid nitrogen, liquid argon, etc., LNG plants, carbon dioxide low-temperature tankers, etc.

This valve has a relatively long stem, which is mainly designed to prevent the stem conducting heat due to high external ambient temperature, thus reducing the risks of seal failure medium vaporization. It features flexible switching, reliable sealing, pressure resistance. The valve body is usually made of cryogenic-resistant materials like cryogenic stainless steel to avoid material embrittlement under low temperature that may affect its performance. Low-temperature resistant materials, such as asbestos impregnated with PTFE flexible graphite, are used as the sealing packing to ensure reliable sealing at low temperatures. Typically, its working temperature can be as low as -196℃, the nominal diameter is generally between DN6 DN20, the design pressure can reach around 4.0MPa.

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