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Madison Co. Virginia | I'm not sure if I dropped these inlet valve components when tinkering with the pump, if my friend did in his earlier tinkering, or if they weren't in there at all. Regardless, I ordered the three parts shown just below that inlet screen. The man I ordered parts from said to drive in and stake that little ring in the end of the valve housing to permanently retain the plunger and spring, but I neglected to ask him which direction the spring and plunger were supposed to go.
I'm a little puzzled by even how this valve works or what it does. There's a small orifice directly above the valve chamber, between the valve and the inlet tube. None of the diagrams online showed a breakdown of this style of endplate.
Do I orient the parts like shown here, or should the spring and plunger be inverted from shown?
Edited by kipps 3/26/2026 17:16
 (KIMG0430 (full).JPG)
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 KIMG0430 (full).JPG (144KB - 1 downloads)
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Roosa-Master injection pump -- can someone confirm this part orientation?
