(空气)蒸汽减压阀

(空气)进口蒸汽减压阀 主要技术参数及性能 Main technical parameters and performance

启动前正常的位置是主阀关闭，而导阀则由弹簧作用力打开.蒸汽由导阀经压力控制管进入主阀隔膜室，部分蒸汽则由控制孔流向下游.施加在主阀隔膜上的控制压力增大，打开主阀  RETZ The normal position before startup is that the main valve is closed, while the pilot valve is opened by the spring force. The steam enters the main valve diaphragm chamber through the pressure control pipe from the pilot valve, and part of the steam flows downstream through the control hole. The control pressure applied to the main valve diaphragm increases, and the main valve is opened

随着蒸汽流过主阀.下游压力上升，并由下游压力感应管反馈作用在导阀隔膜的下部（为了确保下游压力的稳定，应安装下游压力感应管），该作用力使导阀逐渐节流关小，与隔膜上部的弹簧作用力相平衡，从而维持主阀隔膜室内的压力，控制主阀的开度，输送适量的蒸汽，维持下游稳定的压力.当下游压力上升时，反馈压力增大，导阀关闭，主隔膜室的压力从控制孔释放，使主阀紧密关闭 RETZ As the steam flows through the main valve The downstream pressure rises and is fed back to the lower part of the diaphragm of the pilot valve by the downstream pressure sensing pipe (in order to ensure the stability of the downstream pressure, the downstream pressure sensing pipe shall be installed). This force causes the pilot valve to gradually throttle and close down, which is balanced with the spring force on the upper part of the diaphragm, so as to maintain the pressure in the diaphragm chamber of the main valve, control the opening of the main valve, deliver an appropriate amount of steam, and maintain the stable downstream pressure When the downstream pressure rises, the feedback pressure increases, the pilot valve closes, and the pressure of the main diaphragm chamber is released from the control hole to close the main valve tightly

下游任何的负载变化或压力的波动，都会反馈在导阀隔膜的下方，从而调节主阀的开度，确保下游压力的准确稳定 Any load change or pressure fluctuation in the downstream will be fed back to the lower part of the pilot valve diaphragm, so as to adjust the opening of the main valve and ensure the accuracy and stability of the downstream pressure

螺纹连接: 1/2"-2"  BSP NPT

法兰连接:  DN15-250 

执行标准:  BS16/25  GB16/25  DIN16/25  JIS16/25  ANSI 150

阀体承压: PN16-40 

工作温度: 蒸汽 285℃、空气 120℃

压力控制范围 Pressure control range

0.2~3.0 bar g 黄色弹簧

2.5~7.0bar g 蓝色弹簧

6.0~12.0barg 红色弹簧

0.2~17barg 锥形弹簧

16.0~24.0 bar g 灰色弹簧

性能特点∶ Performance characteristics

无需外部动力，减少安装费用 No external power is required to reduce installation costs

精确控制制程压力，改善制程效率，提高产品质量 Accurately control the process pressure, improve the process efficiency and improve the product quality

多种控制的组合，减少总的设备投资  Combination of multiple controls to reduce total equipment investment

本质安全，可用于危险区域  Intrinsically safe for use in hazardous areas

（空气）进口蒸汽减压阀流量示意图 Flow diagram

注: Notes

此流量表是以装上外部感应管为基准的，如不装外部感应管，流量有所减小。在下游压力很低的工况，流量减小可达30%This flow meter is based on the installation of external induction tube. If the external induction tube is not installed, the flow will be reduced. When the downstream pressure is very low, the flow can be reduced by up to 30%. How to use the chart to saturate the steam

饱和蒸汽  Saturated steam

例；蒸汽流量为600kg/h，压力从6bar减至4bar。在表中找到上游压力为6bar的曲线和下游压力为4bar的交点，从该点垂直身下，找到所有系列口径的容量。在该列中DN32的阀是能满足要求的最小口径阀 Example; The steam flow is 600kg / h and the pressure is reduced from 6bar to 4bar. In the table, find the intersection of the curve with the upstream pressure of 6 bar and the curve with the downstream pressure of 4 bar. From this point, find the capacity of all series of calibers. In this column, DN32 valve is the minimum diameter valve that can meet the requirements

过热蒸汽 Superheated steam

由于过热蒸汽比容较大，图中给出的值应乘以修正系数，若过热度为55℃，则修正系数为0.95，若过热度为100℃，修正系数为0.9，用于上述例子，若蒸汽过热度为55℃，则DN32口径的减压阀流通能力为740X0.95=703kg/h，仍能满足600kg/h的负载要求，则DN32 的阀仍适用 Since the specific capacity of superheated steam is large, the value given in the figure should be multiplied by the correction factor. If the superheat is 55 ℃, the correction factor is 0.95; if the superheat is 100 ℃, the correction factor is 0.9. For the above example, if the superheat is 55 ℃, the flow capacity of the DN32 pressure reducing valve is 740x0.95 = 703kg / h, which can still meet the load requirement of 600kg / h, then the DN32 valve is still applicable

故障排除 Troubleshooting

安装示意图 installation diagram

蒸汽减压站 Steam decompression station

减压站中的减压阀应根据管道上，下游压力和蒸汽流量选择口径大小.一般减压阀最少比上游管道小一个口径，其它管道件如汽水分离器，过滤器，截止阀等应与管道同口径.如有需要，减压站可安装旁通阀以备紧急情况使用，旁路阀应安装在减压阀上方与减压阀同口径  RETZ The diameter of the pressure reducing valve in the pressure reducing station shall be selected according to the upstream and downstream pressure and steam flow of the pipeline Generally, the pressure reducing valve shall be at least one caliber smaller than the upstream pipeline. Other pipeline parts, such as steam water separator, filter and stop valve, shall be of the same caliber as the pipeline If necessary, the pressure reducing station can be equipped with a bypass valve for emergency use. The bypass valve shall be installed above the pressure reducing valve with the same diameter as the pressure reducing valve

减压阀串联 Pressure reducing valve in series

如果减压比超过10∶1，应使用2个减压阀串联以获得准确的压力控制 If the pressure reducing ratio exceeds 10:1, 2 pressure reducing valves shall be used in series to obtain accurate pressure control

减压阀并联 Pressure reducing valve (parallel)

减压阀可从100%到0%调节负荷尽管如此，如果阀门要经常工作在小负荷工况时，最好用2个较小的减压阀并联，如果小负荷小于最大负荷的10%则最好选用2台减压阀并联  The pressure reducing valve can adjust the load from 100% to 0%. However, if the valve is to work under small load, it is better to use two smaller pressure reducing valves in parallel. If the small load is less than 10% of the maximum load, it is better to use two pressure reducing valves in parallel

并联减压站还用于关键的，不可中断供汽的应用 Parallel pressure reducing stations are also used for critical, uninterrupted steam supply applications