ocr: PISTON - LLLLID . LA - f - - - - - OUILEI. PISION VALVE - - - - / SPRING HA - - . - - W - - - - - - - - le - à FLTLLA - INLET VALVE As the piston moves in, the pressure increases in the pump. This opens the outlet valve so the contents ofthe pump flow out. As the piston moves out, the pressure drops, opening the inlet valve to draw more liquid into the pump.
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