A-A-55748
and size may be used provided that the valve can be loosened and tightened
adequately by the pressure of thumb and fingers alone, without the use of
tools, at the highest designated operating pressure.
3.12.3 Valve handle. The handle shall be conveniently located on the valve
to permit actuation by hand. The valve handle and all associated parts shall
conveniently fit the operator's hand without discomfort, and shall have.
no sharp edges or projections. The pressure required to move the handle on a
lever-type valve from the closed to the open position shall be not more than
30 pounds per square inch (207 Kpa). The length of the valve handle shall not
be less than 3.5 inches (9 cm) measured from the pivot.
3.12.4 Leakage.
Cut-off valves shall not drip or leak through the valve or
around the packing when subjected to normal operating pressures over a period
of one year.
3.13 Lance. The lance shall be brass or stainless steel and of seamless
construction and shall be easily detachable. It shall have the same thread
and size at both ends so that any number of lances in series, or the nozzle
alone, may be connected directly to the cut-off valve housing. Joints shall
be leakproof and body facings shall have hexagonal or flattened faces. Nuts
of adequate shape and size may be used if couplings are fabricated to enable
air-tight and liquid-tight joints to be made by thumb pressure at the highest
designated operating pressure. When specified, (see 7.2.5), a gasket shall be
required to ensure a tight fit. Standard lances shall be between 16 and 20
inches (40-50 cm) in length, measured between the external faces of the
joints.
3.14.1 Description
The spray nozzle shall be of the hydraulic-energy type
in which droplets are formed by forcing the spray material through an orifice.
It shall consist of a droplet-producing nozzle tip plus a nozzle body and
nozzle cap. The nozzle tip shall be removable and replaceable without the use
of tools, and shall not leak after reassembly. When specified (see 7.2.6),
gaskets of polyethylene or equivalent materials shall be required.
3.14.2 Nozzle assembly. The nozzle assembly consisting of the body, cap and
tip shall be constructed from stainless steel, ceramic or brass.
3.15 Gaskets. All gaskets shall be capable of being readily fitted to the
sprayer. Where possible, gaskets shall be wholly or partially recessed into
the parts into which the joints are made. Polyethylene or gaskets of other
suitable material may be used for working with water suspensions.
3.16 Optional items.
When required, the following items shall be specified
(see 7.2.7):
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