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Join Date: Feb 2012
Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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If the check valve is clean then Bob's your uncle. If dirty with grime clean off with grime cutter (solvent?) If rusty try removing the rust, fine steel wool perhaps. Some will have a ball "bearing" on a spring and this spring can break or otherwise become non functioning. Some can be a molded bit of plastic and the back pressure of the tire closes it against it's seat.
Is there a problem with your pump? Or are you trying to just understand it? Andy
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AndrewRStewart