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.對于1噸燃氣鍋爐額定蒸汽壓力小于2.5MPa的鍋爐，壓力表精確度不應低于2.5級;對于額定蒸汽壓力大于或等于2.5MPa的鍋爐，壓力表的精確度不應低于1.5級。
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.壓力表應根據工作壓力選用。壓力表表盤刻度極限值應為工作壓力的1.5 ～3.0倍，最好選用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.壓力表表盤大小應保證司爐人員能清楚地看到壓力指標值，表盤直徑不應小于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".
壓力表是一種測量壓力大小的儀表，可用來測量鍋爐內實際的壓力值，壓力表指針的變化可以反映燃燒及負荷的變化。司爐人員根據壓力表的指示數來調節燃燒，使之適應外界負荷的變化，將鍋爐壓力控制在允許的范圍內，達到安全運行的目的。因此，壓力表也是鍋爐上不可缺少的安全附件，司爐人員將壓力表比喻成“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.
用在鍋爐上用的壓力表應根據工作壓力選用，蒸汽鍋爐的壓力表表盤刻度最大值應為工作壓力的1.5~3.0倍，最好選用2倍。立臥式蒸汽鍋爐的壓力表表盤大小應保證司爐工能清楚地看到壓力指示值，表盤直徑不應小于100mm，一般高度達2米的鍋爐選用壓力表直徑應不小于200mm。蒸汽鍋爐和壓力表應每半年校驗一次，在工作壓力處劃紅線并加鉛封。
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.
彈簧管由金屬管制成，管子截面呈扁平圓形，它的一端固定在支撐坐上，并與管接頭相通;另一端是封閉的自由端，與連桿鏈接。連桿的另一端連接扇形齒輪，扇形齒輪又與中心軸上的小齒輪相銜接。壓力表的指針，固定在中心軸上。
