Question?What is a dump valve and how does it work?Submit Answer |
Answer by: DougDump valves like those on the Crosman 140 are held shut by the sear. When the trigger is pulled, the valve opens, and stays open until all of the air is dumped. A spring then closes the valve, and the trigger sear resets to hold it closed. This means that the gun doesn't need to be cocked, just pumped. One disadvantage to this system is that the trigger pull get a bit harder with more pumps. |
Answer by: PneumaddictI believe pump valves, as opposed to a valve with continuos supply, should be pumped up no more than the valve can completely dump (empty completely), to shoot consistently. At 5 pumps my HBO's dump, at 10 they still completely dump, but at 12 there remains a bit of pressure in the valve that has not dumped, this will be included as extra pressure for the next shot. You pump one less to remain at the same power level. Continuous supply valves work differently because they immediately fill up after dumping the valve cycle and remain consistent that way, no need to keep track.Alex |
