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A nail gun has a free end 19a and central potion of a trigger arm 19 positioned within a trigger 11, on an upper end 12a of a safety portion 12 and at a plunger 17, respectively. When the trigger 11 is pivoted on its pivot end 16, pivoting movement of the trigger 11 moves a pivot end 18 of the trigg

A nail gun has a free end 19a and central potion of a trigger arm 19 positioned within a trigger 11, on an upper end 12a of a safety portion 12 and at a plunger 17, respectively. When the trigger 11 is pivoted on its pivot end 16, pivoting movement of the trigger 11 moves a pivot end 18 of the trigger arm 19 to press the central portion of the trigger arm 19 into contact with the plunger 17 and, with the plunger 17 serving as a fulcrum, to press the free end 19a downward against the upper end 12a of the safety portion 12. If downward movement of the safety portion 12 is obstructed when the trigger 11 is pivoted, the upper end 12a contacted by the free end 19a of the trigger arm 19 serves as a fulcrum around which the trigger arm 19 pivots with movement of the trigger 11, whereupon the central portion of the trigger arm 19 presses the plunger 17 inward so that an activation switch 10 activates a blade 7 to eject a nail through a nose piece 5.

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A nail gun has a free end 19a and central potion of a trigger arm 19 positioned within a trigger 11, on an upper end 12a of a safety portion 12 and at a plunger 17, respectively. When the trigger 11 is pivoted on its pivot end 16, pivoting movement of the trigger 11 moves a pivot end 18 of the trigg

A nail gun has a free end 19a and central potion of a trigger arm 19 positioned within a trigger 11, on an upper end 12a of a safety portion 12 and at a plunger 17, respectively. When the trigger 11 is pivoted on its pivot end 16, pivoting movement of the trigger 11 moves a pivot end 18 of the trigger arm 19 to press the central portion of the trigger arm 19 into contact with the plunger 17 and, with the plunger 17 serving as a fulcrum, to press the free end 19a downward against the upper end 12a of the safety portion 12. If downward movement of the safety portion 12 is obstructed when the trigger 11 is pivoted, the upper end 12a contacted by the free end 19a of the trigger arm 19 serves as a fulcrum around which the trigger arm 19 pivots with movement of the trigger 11, whereupon the central portion of the trigger arm 19 presses the plunger 17 inward so that an activation switch 10 activates a blade 7 to eject a nail through a nose piece 5. cating movement between charge and discharge positions of the pump piston in the pump chamber; a unitary valve member in the sprayer housing having an inlet valve element and an outlet valve element, the inlet valve element being positioned in the liquid supply passage and being movable between a closed position closing the liquid supply passage and an opened position opening the liquid supply passage in response to the pump piston moving to the discharge and charge positions, respectively, and the outlet valve element being positioned in the liquid discharge passage and being movable between a closed position closing the liquid discharge passage and an opened position opening the liquid discharge passage in response to the pump piston moving to the charge and discharge positions, respectively; and, one of the inlet valve element and the outlet valve element being a tube and one of the inlet valve element and outlet valve element being a disk. 3. The trigger sprayer of claim 2, further comprising: the sprayer housing having a common passage in the sprayer housing between the liquid discharge passage and the liquid supply passage intercommunicating the liquid discharge passage and the liquid supply passage; and, the valve member being positioned in the common passage. 4. A manually operated trigger sprayer comprising: a sprayer housing having a liquid outlet opening and a liquid inlet opening in the sprayer housing, a pump chamber in the sprayer housing, a liquid discharge passage extending through the sprayer housing from the pump chamber to the liquid outlet opening and a liquid supply passage extending through the sprayer housing from the liquid inlet opening to the pump chamber; a pump piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the pump piston in the pump chamber; a unitary valve member in the sprayer housing having an inlet valve element and an outlet valve element, the inlet valve element being positioned in the liquid supply passage and being movable between a closed position closing the liquid supply passage and an opened position opening the liquid supply passage in response to the pump piston moving to the discharge and charge positions, respectively, and the outlet valve element being positioned in the liquid discharge passage and being movable between a closed position closing the liquid discharge passage and an opened position opening the liquid discharge passage in response to the pump piston moving to the charge and discharge positions, respectively; and, the outlet valve element being a tube. 5. The trigger sprayer of claim 4, further comprising: the liquid discharge passage having an interior surface; the pump chamber having an outlet passage that opens through the liquid discharge passage interior surface and communicates the pump chamber with the liquid discharge passage; and the outlet valve element tube overlays the outlet passage and at least a portion of the liquid discharge passage interior surface in the closed position of the outlet valve element tube and the outlet valve element tube is displaced from the outlet passage and at least a portion of the liquid discharge passage interior surface in the opened position of the outlet valve element tube. 6. A manually operated trigger sprayer comprising: a sprayer housing having a liquid outlet opening and a liquid inlet opening in the sprayer housing, a pump chamber in the sprayer housing, a liquid discharge passage extending through the sprayer housing from the pump chamber to the liquid outlet opening and a liquid supply passage extending through the sprayer housing from the liquid inlet opening to the pump chamber; a pump piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the pump piston in the pump chamber; a unitary valve member in the sprayer housing having an inlet valve element and an outlet valve element, th e inlet valve element being positioned in the liquid supply passage and being movable between a closed position closing the liquid supply passage and an opened position opening the liquid supply passage in response to the pump piston moving to the discharge and charge positions, respectively, and the outlet valve element being positioned in the liquid discharge passage and being movable between a closed position closing the liquid discharge passage and an opened position opening the liquid discharge passage in response to the pump piston moving to the charge and discharge positions, respectively; the inlet valve element being a disk; a circular surface inside the sprayer housing and around the liquid supply passage; and the inlet valve element disk overlays the circular surface in the closed position of the inlet valve element disk and the inlet valve element disk is displaced from at least a portion of the circular surface in the opened position of the inlet valve element disk. 7. The trigger sprayer of claim 6, further comprising: a valve seat insert that is inserted through the liquid inlet opening into the liquid supply passage, the circular surface being on the valve seat insert. 8. The trigger sprayer of claim 7, further comprising: a dip tube connected to the valve seat insert. 9. A manually operated trigger sprayer comprising: a sprayer housing having a liquid outlet opening and a liquid inlet opening in the sprayer housing, a pump chamber in the sprayer housing, a liquid discharge passage extending through the sprayer housing from the pump chamber to the liquid outlet opening and a liquid supply passage extending through the sprayer housing from the liquid inlet opening to the pump chamber; a pump piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the pump piston in the pump chamber; a unitary valve member in the sprayer housing having an inlet valve element and an outlet valve element, the inlet valve element being positioned in the liquid supply passage and being movable between a closed position closing the liquid supply passage and an opened position opening the liquid supply passage in response to the pump piston moving to the discharge and charge positions, respectively, and the outlet valve element being positioned in the liquid discharge passage and being movable between a closed position closing the liquid discharge passage and an opened position opening the liquid discharge passage in response to the pump piston moving to the charge and discharge positions, respectively; and, the inlet valve element being a disk and the outlet valve element being a tube. 10. The trigger sprayer of claim 9, further comprising: the liquid discharge passage having an interior surface; an outlet passage in the sprayer housing communicating the pump chamber with the liquid discharge passage; and, the outlet valve element tube overlaying the outlet passage and at least a portion of the liquid discharge passage interior surface in the closed position of the outlet valve element tube and the outlet valve element tube being displaced from the outlet passage and at least a portion of the liquid discharge passage interior surface in the opened position of the outlet valve element tube. 11. The trigger sprayer of claim 9, further comprising: a circular surface in the sprayer housing and around the liquid supply passage; and the inlet valve element disk overlaying the circular surface in the closed position of the inlet valve element disk and the inlet valve element is displaced from at least a portion of the circular surface in the opened position of the inlet valve element disk. 12. A manually operated trigger sprayer comprising: a sprayer housing having a liquid outlet opening and a liquid inlet opening in the sprayer housing, a pump chamber in the sprayer housing, a liquid discharge passage extending through the sprayer housing from the pump c hamber to the liquid outlet opening and a liquid supply passage extending through the sprayer housing from the liquid inlet opening to the pump chamber; a pump piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the pump piston in the pump chamber; a unitary valve member in the sprayer housing having an inlet valve element and an outlet valve element, the inlet valve element being positioned in the liquid supply passage and being movable between a closed position closing the liquid supply passage and an opened position opening the liquid supply passage in response to the pump piston moving to the discharge and charge positions, respectively, and the outlet valve element being positioned in the liquid discharge passage and being movable between a closed position closing the liquid discharge passage and an opened position opening the liquid discharge passage in response to the pump piston moving to the charge and discharge positions, respectively; and, a trigger mounted on the sprayer housing for pivoting movement of the trigger, the trigger having an integral spring arm extending from the trigger and engaging with the sprayer housing. 13. A manually operated trigger sprayer comprising: a sprayer housing having a liquid outlet opening and a liquid inlet opening, a pump chamber in the sprayer housing, a liquid discharge passage extending through the sprayer housing from the pump chamber to the liquid outlet opening, the liquid discharge passage having an interior surface, a liquid supply passage extending through the sprayer housing from the liquid inlet opening to the pump chamber, the liquid supply passage having an interior surface; a pump piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the pump piston in the pump chamber; an inlet valve element disk with a peripheral edge positioned in the liquid supply passage and being movable between a closed position where the inlet element disk peripheral edge engages with the liquid supply passage interior surface and an opened position where the inlet valve element disk peripheral edge at least partially disengages from the liquid supply passage interior surface in response to the pump piston moving to the discharge and charge positions, respectively; and, an outlet valve element tube with an exterior surface positioned in the liquid discharge passage and being movable between a closed position where the outlet valve element tube exterior surface engages with the liquid discharge passage interior surface and an opened position where the outlet valve element tube exterior surface at least partially disengages from the liquid discharge passage interior surface in response to the pump piston moving to the charge and discharge positions, respectively. 14. The trigger sprayer of claim 13, further comprising: the pump chamber having an inlet passage that communicates the pump chamber with the liquid supply passage and the pump chamber having an outlet passage that communicates the pump chamber with the liquid discharge passage; the outlet valve element tube overlaying the pump chamber outlet passage and being displaced from the pump chamber outlet passage in the respective closed and opened positions of the outlet valve element tube. 15. The trigger sprayer of claim 14, further comprising: a circular surface inside the sprayer housing with an opening through the circular surface, the liquid supply passage extending through the opening in the circular surface; and, the inlet valve element disk overlaying the opening in the circular surface and being at least partially displaced from the opening in the circular surface in the respective closed and opened positions of the inlet valve element disk. 16. The trigger sprayer of claim 15, further comprising: the inlet valve element disk peripheral edge overlaying the circular surface and being at least partially dis placed from the circular surface in the respective closed and opened positions of the inlet valve element disk. 17. The trigger sprayer of claim 15, further comprising: a valve seat insert that is inserted through the liquid inlet opening into the liquid supply passage, the circular surface being on the valve seat insert and the opening in the circular surface extending through the valve seat insert. 18. The trigger sprayer of claim 17, further comprising: a dip tube connected to the valve seat insert. 19. The trigger sprayer of claim 13, further comprising: a trigger mounted on the sprayer housing for pivoting movement of the trigger, the trigger having an integral spring arm extending from the trigger and engaging with the trigger sprayer housing. 20. A manually operated trigger sprayer comprising: a sprayer housing having a liquid outlet opening and a liquid inlet opening, a pump chamber in the sprayer housing, a liquid discharge passage extending through the sprayer housing from the pump chamber to the liquid outlet opening and a liquid supply passage extending through the sprayer housing from the liquid inlet opening to the pump chamber; a pump piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the pump piston in the pump chamber; an outlet valve element positioned in the liquid discharge passage and being movable between a closed position closing the liquid discharge passage and an opened position opening the liquid discharge passage in response to the pump piston moving to the respective charge and discharge positions; a valve seat insert that is inserted through the liquid inlet opening into the liquid supply passage, the valve seat insert having a circular surface with an opening in the circular surface, the liquid supply passage extending through the opening in the circular surface; and, an inlet valve element disk with a peripheral edge positioned in the liquid supply passage and being movable between a closed position where the inlet valve element disk peripheral edge engages with the circular surface closing the liquid supply passage and an opened position where the inlet valve element disk peripheral edge is at least partially disengaged from the circular surface opening the liquid supply passage in response to the pump piston moving to the respective discharge and charge positions. 21. The trigger sprayer of claim 20, further comprising: a dip tube connected to the valve seat insert. 22. The trigger sprayer of claim 20, further comprising: the sprayer housing having a common passage in the sprayer housing between the liquid discharge passage and the liquid supply passage and the outlet valve element, the inlet valve element disk and the valve seat insert being inserted through the liquid inlet opening into the liquid discharge passage and the liquid supply passage. 23. The trigger sprayer of claim 22, further comprising: the outlet valve element and the inlet valve element disk being part of a unitary valve member that is inserted through the liquid inlet opening. 24. The trigger sprayer of claim 23, further comprising: the unitary valve member having a base with the outlet valve element and the inlet valve element disk being on opposite sides of the base; and the base is inserted into the common passage. 25. The trigger sprayer of claim 20, further comprising: the valve seat insert having a cylindrical exterior surface that engages with the sprayer housing to hold the valve seat insert in the liquid supply passage. 26. The trigger sprayer of claim 25, further comprising: the valve seat insert cylindrical exterior surface having opposite ends with the circular surface being at one end, the opening in the circular surface being one of a plurality of openings in the circular surface that extended through the valve seat insert between the opposite ends; and a post on the valve seat insert surrounded by the pl