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nature : for gas compression and transmission equipment for the tributaries. In the industrial sector is extensively used. The following three main purposes : (a) gas transportation from A to B Department, the initial gas pressure and ultimately do not change (with fans); (2) to improve gas pressure (compressor); (3) to reduce the gas (or vapor) pressure ( using vacuum pump). Generally by the pressure divided into four categories : (a) blower, pressure gauge pressure of not more than 0.015 MPa (0.15 atmospheres, or 1,500 mm water column); (2) blower, the pressure is the pressure of 0.015 to 0.2 MPa (0 .15 ~ 2 atm); (3) compressors, pressure is the pressure of 0.2 MPa (2 atm) above; (4) vacuum pump, pressure lower than atmospheric pressure.
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