1. for rated steam pressure is less than 2.5MPa boilers, pressure gauges should not be less than 2.5 accuracy; for rated steam pressure is greater than or equal to 2.5MPa boilers, pressure gauges should not be less than 1.5 accuracy.
1.对于1吨燃气锅炉额定蒸汽压力小于2.5MPa的锅炉，压力表精确度不应低于2.5级;对于额定蒸汽压力大于或等于2.5MPa的锅炉，压力表的精确度不应低于1.5级。
2. the pressure gauge should be selected according to the working pressure. Pressure gauge dial scale limit should be 1.5 to 3 times the work pressure, preferably 2 times.
2.压力表应根据工作压力选用。压力表表盘刻度极限值应为工作压力的1.5 ～3.0倍，最好选用2倍。
3. pressure gauge size should ensure the fireman can clearly see that the pressure index value, dial diameter should not be less than 100mm.
3.压力表表盘大小应保证司炉人员能清楚地看到压力指标值，表盘直径不应小于100mm。
A pressure meter is a gauge for measuring the magnitude of pressure. It can be used to measure the actual pressure value in a boiler. The change of the indicator of a pressure indicator can reflect the change of combustion and load. The fireman according to the instructions of the pressure gauge to adjust the combustion, so as to adapt to the change of external load, the boiler pressure control in the allowed range, to achieve the purpose of safe operation. Therefore, the essential safety accessories of pressure gauge is the boiler, the boiler operators will be likened to "eye pressure gauge".
压力表是一种测量压力大小的仪表，可用来测量锅炉内实际的压力值，压力表指针的变化可以反映燃烧及负荷的变化。司炉人员根据压力表的指示数来调节燃烧，使之适应外界负荷的变化，将锅炉压力控制在允许的范围内，达到安全运行的目的。因此，压力表也是锅炉上不可缺少的安全附件，司炉人员将压力表比喻成“眼睛”。
The pressure meter used on the boiler should be selected according to the working pressure. The maximum value of the dial scale of the steam boiler should be 1.5~3.0 times of the working pressure, and the best choice is 2 times. Pressure gauge the size of vertical and horizontal steam boiler should ensure the fireman can see clearly the pressure indicator, dial diameter should not be less than 100mm, the general height of 2 meters with the boiler pressure gauge diameter should not be less than 200mm. The steam boiler and the pressure gauge should be calibrated once every six months, to draw a red line in the working pressure and lead seal.
用在锅炉上用的压力表应根据工作压力选用，蒸汽锅炉的压力表表盘刻度最大值应为工作压力的1.5~3.0倍，最好选用2倍。立卧式蒸汽锅炉的压力表表盘大小应保证司炉工能清楚地看到压力指示值，表盘直径不应小于100mm，一般高度达2米的锅炉选用压力表直径应不小于200mm。蒸汽锅炉和压力表应每半年校验一次，在工作压力处划红线并加铅封。
The spring tube is made of a metal tube, the cross section of the pipe is flat and round, one end of the tube is fixed on the supporting seat and communicated with the pipe joint; the other end is a closed free end and is connected with the connecting rod. The other end of the connecting rod is connected with a sector gear, and the sector gear is connected with the pinion on the central shaft. The indicator of the pressure gauge is fixed on the central shaft.
弹簧管由金属管制成，管子截面呈扁平圆形，它的一端固定在支撑坐上，并与管接头相通;另一端是封闭的自由端，与连杆链接。连杆的另一端连接扇形齿轮，扇形齿轮又与中心轴上的小齿轮相衔接。压力表的指针，固定在中心轴上。
