A-A-55748
3.6.5 Plug for p ressure gauge opening A plug shall be provided for the
opening into which a pressure gauge can fit to provide an air-tight and
liquid-tight closure, should the gauge not be required (see notes).
3.7 Pump.
3.7.1 Construction. The pump cylinder shall be of seamless or electrically
welded construction if made-of stainless steel or brass. The pump cylinder
shall be a separate part, independently detachable from the tank, tank top,
or any other component of the sprayer. The upper part of the cylinder shall
be cone-shaped to facilitate reassembly of the plunger cup.
The pump check valve shall be of synthetic rubber such as
3.7.2 Check valve
polysulfide (i.e., Thiokol) or fluorocarbon (i.e., Viton), shore hardness
67-73, or equal, and shall be air-tight and liquid-tight. It shall be so
designed as to prevent any leaking of liquid into the pump cylinder over a
period of 15 minutes when the tank is pressurized between 65-70 psi (447.8 -
482.2 Kpa) and the check valve is fully submerged.
3.7.3 Plunger shaft
The plunger shaft shall be of steel and may be either
a solid rod or a tube.
The plunger cup shall be not less than 0.06 inch (1.5 mm)
3.7.4 Plunger cup.
thick and the cup skirt shall be not less than 0.5 inch (13 mm) in length. It
shall be fungus resistant.
3.7.5 Plunger cup assemb ly. The plunger cup assembly shall be so constructed
that whenever positive downward pressure is applied to the plunger rod when in
the raised position, the plunger cup skirt is pressed against the pump
cylinder wall to form a seal and provide pressurization.
3.7.6 Handle. The pump handle shall be of the D-type and shall have a grip
of not less than 3.56 inches (9 mm) inside the grip support. The pump handle
shall be so designed that a complete stroke of the pump may be obtained with
the pump handle turned to any position. The compression strength of the
assembly, including the handle, its components, and its junction with the
plunger rod, shall not be less than that of the plunger rod. Whatever the
material of manufacture, it shall be nonabsorbent.
3.7.7
The plunger shaft shall befitted with a
quick-acting locking device that, when applied, will secure the plunger
assembly nearest to the lowest operating position for carrying.
3.8 Dip tube.
The dip tube shall be constructed of brass, stainless steel,
or other suitable material, and shall extend to within approximately 0.4 inch
(10.2 mm) of the bottom of the tank. The end of the tube within the tank
shall be cut at an angle to prevent blockage. The dip tube shall be securely
supported at the point where it emerges from the tank.
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