Overhaul of York YFG type screw compressors

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This post was last edited by Lantian on 2017-5-27 at 18:49: http://v.youku.com/v_show/id_XMjc4MzI2MjQwOA==.html?firsttime=7. Maintenance and overhaul of York YFG screw compressors, which are used for industrial refrigeration; the male and female rotors are supported by axial and radial bearings, with a tooth ratio of 4:6. The fixed volume ratio is generally 2.2, 3.5, or 5.0. The slide valve allows for stepless adjustment within the range of 15–100%. A helical potentiometer is used to indicate the position of the slide valve, and O-rings are commonly employed for sealing the unit. The common head models are YFG1918, YFG2313, YFG2317, and YFG2321, with the corresponding unit models being RWKII40, RWKII55, RWKII65, and RWKII100. This article mainly explains the assembly process. 1. Disassembly for major maintenance of YFG screw compressor: 1.1 Disassemble the compressor. 1.2 Repair various vulnerable components such as the screw, the end faces of the chamber, etc. 1.3 Clean all mechanical components. 1.4 Replace bearings, sealing rings, gaskets, balance pistons, balance piston sleeves, adjustment shims, shaft seals, etc. (depending on the specific situation). 2. Assembly and maintenance of YFG compressors: 2.1 Install the slide valve into the slide valve seat. 2.2 Combine the exhaust surface of the exhaust end cover with the rotor end cover surface. 2.3 Measure the gap between the slide valve and the guide surfaces (using a feeler gauge), as well as the gap between the slide valve and the rotor (using special tools). 2.4 Heat the inner ring of the sliding bearing while cooling the outer ring with a refrigerator. 2.5 Install the rotor into the rotor chamber. 2.6 Mount the suction end cover onto the machine body. 2.7 Measure the total gap of the rotor within the chamber. 2.8 Install the thrust bearings and measure serta adjust the gap at the exhaust end. 2.9 Install the shaft seal. 2.10 Measure the bearing clearance. 2.12 Measure serta install the gap between the balance piston and the sleeve (5–8 threads is appropriate). 2.13 Install the slide valve piston and the oil groove cover plate (using special tools). 2.14 Install the energy indication mechanism. That’s all regarding the major repair of York YFG screw compressors. If you have any questions, feel free to discuss them in the group dedicated to York screw compressor repairs: 251079716. http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526130137183718855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123753445344855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123822682268855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123816061606855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123954865486855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526123961916191855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526125139013901855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526125228252825855136.jpg http://img05.jdzj.com/oledit/UploadFile/news2017a/image/20170526/20170526125211271127855136.jpg