自动排空装置分为两种 :（低压PN25以内）液囊热敏元件组成和（过热蒸汽系统）双金属片组成。
Free-ball float trap
The drain valve is opened or closed by taking advantage of the change of liquid level of condensate water with the high-precision grinding stainless steel hollow float ball in the valve cavity. This steam trap has a simple structure, mainly consisting of float balls and automatic emptying devices. The sole action elements, namely, the stainless steel hollow float ball is manufactured by high-precision grinding process, and its entire sphere can serve as the sealing face and will not be worn intensively during the work, so it has a longer service life. In addition, there is no wearing part in the valve cavity, with a high reliability. The float ball can freely adjust the openness of the valve opening in response to the change of water level and discharge the condensate water continuously with a subcooled temperature of about 0℃ and higher efficiency.
The automatic emptying devices fall into two types : (within low pressure PN25) consisting of reservoir thermo-sensitive elements and (overheated steam system) consisting of bimetals.
优点：
1、转动的是高精度研磨的不锈钢浮球，抗腐蚀。
2、结构简单，维修方便。
3、不受压力波动的影响，连续排水，噪声小。
4、装有自动排空装置，能够迅速排除空气，防止气堵和汽锁。
5、体积小，排量大。
6、有水就排，能够加快系统启动速度。
Merits
1. The sole moving component is the high-precision grinding stainless float ball, which can resist erosion.
2. Its simple structure is convenient for maintenance.
3. To drain continuously with low noise, without being affected by the fluctuation of the pressure.
4. To be equipped with automatic emptying devices and it can eliminate air quickly and prevent air blocking and steam locking.
5. Small volume and large displacement.
6. To drain whenever there is water left over so as to quicken the startup speed of the system.
主要零件材料/The materials of primary accessories
| 零部件名称Part and component name | 材质Material |
| 阀体、阀盖Valve body、valve cover | 铸铁、铸钢、不锈钢Cast iron、Cast steel、Stainless steel |
| 自由浮球Free float ball | 304/316不锈钢304/316 Stainless steel |
| 阀座Valve seat | 高铬不锈钢High chrome stainless steel |
| 自动排空气装置Automatic air exhaust | 不锈钢、热敏元件Stainless steel、Thermo-sensitive element |
| 过滤网、罩Filtrating screen、Cover | 不锈钢Stainless steel |
不锈钢球直径/Diameter of stainless bal
| 材质/Material | A,JH3N | B,JH5N | D,JH7N | E,JH9N | F,JH11N | G,JH13N |
| 铸铁 Cast iron | 50 | 68 | 110 | 150 | 180 | 200 |
| 铸钢 Cast steel | 50 | 70 | 120 | 150 | 190 | 220 |
在设备刚启动时，低温冷凝水和空气同时进入阀腔，这时开启自动排空装置将空气排除，使低温凝结水顺利进入阀腔，阀腔内的凝结水的液位随即上升，使浮球升高，开启阀孔，将凝结水迅速排出 ; 前面的蒸汽很快进入加热设备，使设备迅速加热升温，当蒸汽或较高温度的凝结水进入阀腔时，自动排空装置开始膨胀，关闭自动排空气装置，疏水阀开始正常工作。这时阀腔内的浮球随凝结水液位的高低而升降，能连续的排放凝结水。由于自由浮球式疏水阀的阀座孔总处于凝结水液位以下，形成水封，水汽自然分离，工作时达到无蒸汽泄漏。该阀的最小工作压力为0.01Mpa，从0.01Mpa至工作压力范围内不受温度和工作压力波动的影响，能连续工作，其最小过冷度约为0℃，由于该阀能自动、连续地排除凝结水，加热设备内不会有水积聚，能使加热设备达到理想换热效率。是生产工艺加热设备的理想疏水阀之一。
Description of work principle
When the equipment is just started, the low-temperature condensate and air enter the valve cavity at the same time. At this time, open the automatic evacuation device to remove the air, so that the low-temperature condensate can enter the valve cavity smoothly. The liquid level of the condensate in the valve cavity will rise immediately, so that the floating ball will rise. Open the valve hole, so that the condensate can be discharged quickly. The steam in front of the equipment will enter the heating equipment quickly, so that the equipment can be heated quickly and heated up. When the steam or the temperature is lower than When the high temperature condensed water enters the valve chamber, the automatic emptying device starts to expand, the automatic air exhausting device is closed, and the drain valve starts to work normally. At this time, the floating ball in the valve chamber will rise and fall with the level of condensate, which can discharge condensate continuously. Because the valve seat hole of the free floating ball type drain valve is always below the condensate level, forming a water seal, the water vapor is naturally separated, and there is no steam leakage during operation. The minimum working pressure of the valve is 0.01Mpa, from 0.01Mpa to the maximum working pressure range, it is not affected by the fluctuation of temperature and working pressure, and can work continuously. Its minimum supercooling degree is about 0 ℃. Because the valve can automatically and continuously remove the condensate, there is no water accumulation in the heating equipment, which can make the heating equipment achieve the ideal heat exchange efficiency. It is one of the ideal drain valves for heating equipment of production process.
自由浮球式疏水阀 FREE-BALL FLOAT TRAP
技术参数/Technique parameter
| 壳体压力等级 Shell pressure grade | 负荷泄漏率 Load Leakage rate | 使用介质 Used medium | 壳体材质 Shell material | 允许背压率 Permitted backpressure rate | 工作 压差 Maximum operating pressure differential |
| 1.6、 2.5、 4.0、 6.4MPA | ≈0% | 蒸汽、凝结水 Steam、 Condensate water | 碳钢/ 304/ 316 Carbon steel | ≥80% | 4.0MPA |
| 节能效果 Energy saving effect | 最小过冷度 Minimum Subcooled temperature | 排水方式 Drainage method | 允许温度 Maximum Allowable temperature | 排空气装置 Air Exhaust system | 压力变化范围 Pressure Change range |
| 优秀 Excellence | 0℃ | 连续方式 Continue mode | 420℃ | 自动 Automatic | 适应 Adaption |
| 产品型号 Product model | 口径(DN) Calibre | L法兰 Flange | L螺纹/ 焊接 Thread/ welding | H1 | H2 | W | 重量 Weight | 使用压力 范围 (Mpa) Pressure change range | 公称压力 (Mpa) Nominal pressure |
| JH13NF | 100~200 | 550 | - | 158 | 422 | 378 | 126 129 | 0.1-2.5 | 2.5-4.0 |
| JH13N40F | 100~200 | 570 | - | 158 | 422 | 378 | 141 | 0.1-4.0 | 6.4 |
排水量/Capacity
注解：
1、选型时请提供工作压力、工作压差、凝结水发生量、工作温度、连接方式及标准。
2、凝结水负荷的安全系数一般为2～3倍。
3、正确安装、定期保养清除阀内污物，保证疏水阀正常工作和延长使用寿命。
4、装有自动排气阀的疏水阀，其凝结水量能够额外增加300Kg/h。
Note
1. Please provide operating pressure and operating pressure difference, generating quantity of condensation water, operating temperature, connecting mode and standards in selecting product models.
2.The load of condensation water’s safety coefficient reaches 2 to 3 times in general.
3. Please make sure the drain valve is installed properly, maintained regularly, cleaned up and operates under the normal condition, so as to extend its service life.
4.The steam trap, if equipped with automatic exhaust valve, can have the quantity of condensate water increased by 300Kg/h.
