Talk:Grease gun (tool)

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	Grease gun (tool) is part of WikiProject Woodworking, a project to improve all aspects of the woodworking area. If you would like to participate, you can choose to edit this article, and to visit the project page, where you can join and see a list of open tasks to help with.
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I'm not sure why this tool is included in these two categories as it used as neither a wood nor a metal working tool. If there is a machinery maintenance category it should be added there. Patris Magnus 22:15, 23 August 2006 (UTC)

[edit] Valves

• I dissassembled a grease gun and discovered that it has two ball-bearing check valves, one just after the piston and one just before the nozzle. However, they appear to be pointing in opposite directions. That is, if "O" is a ball bearing, ":" a rubber seal, and "\/\/\" a spring, it looks like this:-

piston ->   :O\/\/\  tube \/\/\O: -> out

It seems like the second valve would prevent it from working at all. I am guessing it acts like a zener diode, allowing forward flow only at high pressure, but I can't figure out how it works. Any ideas? —Ben FrantzDale 17:37, 10 April 2006 (UTC)

• If you look at the nozzle assembly a little closer, you will discover that the check ball in the nozzle bears against the three metal leaves that lock the nozzle on the grease fitting. The force generated causes the grease gun nozzle to grip the grease fitting even tighter to hold it in place against the very high force generated at the tip of the nozzle. Some guns have a little plate that the ball bears against to transfer the force into the leaves. In either case there is enough gap to allow grease to flow around this assembly once sufficient pressure has built up. Patris Magnus 18:19, 11 August 2006 (UTC)