Is the spool position equivalent to the compressor return?
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The slide valve opening is similar to that of the compressor return valve; when the slide valve is at position 0, it is equivalent to the return valve being fully open, resulting in a low output flow rate. What is the reason why it is often said that the slide valve should not operate at 30% for an extended period of time?
Please, the original poster, provide more detailed information, such as what kind of slide valve or device it is, to facilitate discussion among everyone
The description isn’t very clear. If it’s a check valve, an opening degree of 0 means it’s fully closed, with no backflow. As for the inability to maintain 30% opening for an extended period, this is related to the characteristics of the valve; it’s not necessarily impossible to keep it at 30% for a long time
For special issues, it’s best to have specialized craftsmen and technicians nearby to provide explanations. Some general nouns can be discussed, while some confidential terms are not general, so it’s impossible to explain such issues. But guess the answer; it’s just for reference. This may be related to the load on the compressor; the pressure is controlled by the backflow rate, but an excessive backflow rate can cause the unit to overheat and damage the equipment. Is this 30% referring to that meaning? For reference.
What type of machine is a compressor? “What is the function of a “return valve”? Is it an IGV valve or a backflow valve?
The slide valve is the load regulator of screw compressors
Under normal conditions, the slide valve is in an open position; we refer to this as the slide valve’s load position. The higher this load position, the greater the compressor’s load. Many machine programs have a specified minimum load level for operation, while others do not; the specific values vary from manufacturer to manufacturer.