Reasons for the increase in inter-stage pressure
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For a reciprocating compressor with two-stage compression, what is the reason for the increase in pressure between the stages? Do I need to check the secondary intake valve or the primary exhaust valve?
There aren’t many valves anyway, so let’s check them all at once. Especially the outlet valve. If the inlet valve is leaking, the temperature will be high; this can be felt by touch. For reference.
Any damage to a valve will be reflected in the exhaust temperature; if the intake valve leaks, both the intake and exhaust valve temperatures will rise. An increase in inter-stage pressure is most likely due to damage to the second-stage intake valve. It’s best to conduct on-site temperature measurements for inspection, and if possible, it’s safer to disassemble and inspect all the valves
Feel it with your hand to tell. Reason 1: Air valve leakage. Reason 2: Leakage at the air valve gasket. Reason 3: Debris present
I’d like to add that a poor cooling effect of the inter-stage cooler can also lead to an increase in pressure!
The secondary intake valve is more likely to be damaged; measure the temperature of the valve cover – the one with the higher temperature is the damaged one.
Leakage in the secondary inlet valve can cause an increase in the pressure between stages
Pay attention to whether there is liquid in the inter-stage separator after cooling; if liquid is present, it can enter the secondary inlet valve and cause damage to its valve plates. Insufficient or uneven tightening of the screws that hold the valve cover in place can also lead to air leakage, resulting in poor sealing. Additionally, if the filter screens at the pipeline inlet are damaged, debris can enter the pipeline. When the valve plates move up by about 1 mm, this debris can damage the sealing surfaces. Poor cooling performance of the cooler means that the valve plates are exposed to high temperatures, reducing their lifespan. It is essential to ensure that there is no liquid or debris present, to maintain proper cooling, and to tighten all components properly in order to extend the valve’s service life.