Roots vacuum pump combination of relief valve and bypass valve Zhou Baohong (Shanghai Bohui Vacuum Equipment Co., Ltd., Shanghai 200041) closed valve, Roots pump function will be more complete: Roots vacuum pump; relief valve; bypass combination valve Roots vacuum pump (hereinafter referred to as the Roots pump as booster pump in vacuum, overflow and bypass are two important functions. In the past, the overflow valve was mistakenly referred to as a bypass valve. In fact, the Roots pump is not bypassed by itself. Function, only through the introduction of this article, the relief valve will be modified design, only these two functions are well combined together to start the Roots pump in advance, which of course can increase some pumping speed, but the zero-flow compression from the Roots pump Specific characteristics and pumping speed characteristic curves can be seen in the 6 3 Conclusion The combination valve combines the two functions of overflow and bypass to increase the technical content of the Roots pump. From the process point of view, the implementation is very convenient. Plate 2. Sealing ring 3. Valve plug 4. Valve body 5. Sealing ring 6. Valve plate 7. Spring 8. By-pass bonnet (fixing screw) 9. Pump body 1tt Rotor bypass and overflow Dual-function combination valve principle The structure diagram simplifies the unit structure, facilitates user operation, and saves production The cost of the bypass piping is at least equivalent to one or two small vacuum pumps. Therefore, the social and economic benefits of the design are very obvious. By using the combination valve, the type of Roots pump should be set to ZJP/YXX. Only meet the technical connotation of Roots pump product model
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