低温高压针型阀
商品详情
性能特点
技术参数
DJ21Y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）。低温高压截止阀只适用于全开和全关，不允许作调节和节流。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。DJ21Y低温高压针型阀广泛应用于能源、石化、冶金、航天、核工业、铁道等行业等行业。
DJ21Y低温高压针型阀结构特点：
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。
DJ21Y低温高压针型阀性能参数：
| 公称通径 | DN10mm～50mm |
| 公称压力 | PN32.0MPa |
| 适用介质 | 液氧、液氮、液氩、液化天然气、液态二氧化碳、液态丙烷等 |
| 适用温度 | -196℃～+150℃ |
DJ21Y低温高压针型阀主要零件材料：
| 阀体、阀盖 | 0Cr18Ni9 |
| 阀瓣、阀杆 | 0Cr18Ni9 |
| 密封圈 | T2 |
| 填料 | PTFE |
DJ21Y低温高压针型阀主要尺寸：
| 产品型号 | DJ61Y-320P低温高压截止阀 | 重量(kg) | |||||||
| 产品代号 | 通径DN(mm) | 尺 寸(mm) | |||||||
| H开 | H关 | D1 | D2 | L | A | D0 | |||
| DJ61Y10 | 10 | 258 | 250 | 10 | 14.5 | 10 | 80 | 160 | 7.0 |
| DJ61Y15 | 15 | 258 | 250 | 15 | 22.5 | 10 | 110 | 160 | 7.2 |
| DJ61Y20 | 20 | 322 | 310 | 20 | 28.5 | 10 | 120 | 250 | 11.1 |
| DJ61Y25 | 25 | 322 | 310 | 25 | 34.5 | 15 | 120 | 250 | 11.4 |
| DJ61Y40 | 40 | 390 | 370 | 40 | 49.5 | 15 | 180 | 400 | 22.8 |
| DJ61Y50 | 50 | 390 | 370 | 50 | 61.5 | 15 | 200 | 450 | 23.3 |
低温高压针型阀
低温高压针型阀是专门用于控制低温高压介质流动的特殊阀门，采用细长的锥形阀针（Needle）和阀座配合实现微流量调节关断。主要应用于LNG、液氮、液氧等低温介质的高压输送系统，要求阀门在-196℃的极低温度和高压（通常Class 600以上）工况下仍能实现调节和气泡级密封。
低温高压针型阀核心特点：
精密流量调节
细长锥形阀针实现毫米级行程控制
多螺纹细牙杆设计，调节精度高
开启圈数通常≥10圈，实现精细调节
低温高压针型阀高压密封稳定
金属硬密封+软密封复合结构
锥面密封比压高，适用压差≥42MPa
阀杆密封采用柔性石墨+PTFE组合
低温高压针型阀低温适应性
主体材料：深冷处理316L/304不锈钢
延长颈设计：防止填料函结冰
低温专用填料：柔性石墨+Inconel 718弹簧
低温高压针型阀安全结构特点
防吹出阀杆结构（Anti-blowout stem）
手轮限位锁定装置
防火防静电设计
低温高压针型阀典型应用：
LNG高压泵出口调节
低温实验装置流量控制
空分设备液氧/液氮精密调节
低温介质取样系统
航天推进剂加注系统
Product Overview of Cryogenic High-Pressure Needle Valves
Cryogenic High-Pressure Needle Valves are specialized valves designed for precise control of cryogenic high-pressure media flow. They utilize a slender tapered needle seat configuration to achieve micro-flow regulation reliable shut-off. Primarily used in high-pressure transmission systems for cryogenic media such as LNG, liquid nitrogen, liquid oxygen, these valves maintain precise regulation bubble-tight sealing under extreme conditions of -196℃ high pressure (typically Class 600 above).
Key Features:
Precise Flow Regulation
Slender tapered needle for millimeter-scale stroke control
Multi-thread fine screw design for high adjustment accuracy
Typically ≥10 turns to open for fine adjustment
High-Pressure Sealing
Metal hard seal + soft seal composite structure
High specific pressure on conical surface, suitable for ΔP≥42MPa
Stem sealing using flexible graphite + PTFE combination
Cryogenic Adaptation
Body material: Deep-cryo treated 316L/304 stainless steel
Extended bonnet: Prevents packing freezing
Cryogenic packing: Flexible graphite + Inconel 718 spring
Safety Features
Anti-blowout stem design
Handwheel limit locking device
Fire-safe anti-static design
Typical Applications:
LNG high-pressure pump outlet regulation
Flow control in cryogenic experimental devices
Precision regulation in air separation units (liquid oxygen/nitrogen)
Cryogenic media sampling systems
Aerospace propellant loading systems
Technical Specifications:
Pressure Rating: Class 800-2500
Temperature Range: -196℃ to +80℃
Leakage Class: ANSI B16.104 Class VI
Connection Types: SW, BW, NPT
Materials: SS316L, Monel, Inconel