10
819.0254
Installation
Fluid Pressure Relief Kit (for Pump Model 810.0780 only)
Fig. 6
Caution
Pressure Relief Kit 819.6479 (Z) is available, to
prevent overpressurization and rupture of the pump or
hose. See Fig. 6. The kit includes instructions.
Thermal expansion of fluid in the outlet line can cause
overpressurization. This can occur when using long
fluid lines exposed to sunlight or ambient heat, or
when pumping from a cool to a warm area (for
example, from an underground tank).
This kit is not for use in fuel dispense
applications. Order a fuel dispense pump, Model
810.0781, which is equipped with a pressure relief
valve 819.0252. See page 8.
Overpressurization can also occur if the VA 25 pump
is being used to feed fluid to a piston pump, and the
intake valve of the piston pump does not close,
causing fluid to back up in the outlet line.
8
N
U
5
Z
Z
6
4
2653c
2
KEY
1
1 in. npt(f) optional fluid outlet port
2
Fluid covers
3
1 in. npt(f) optional fluid inlet port
6
Manifold and cover screws
8
Air valve screws
N
1/2 in. npt(f) air inlet port
U
Muffler; air exhaust port is 3/4 in. npt(f)
Z
Pressure relief kit
Apply medium-strength (blue) Loctite or
equivalent to the threads and install kit between
fluid inlet and outlet manifolds.
1
Connect fluid inlet line here.
2
Connect fluid outlet line here.
3
Torque to 120 to 150 in-Ib (14 to 15 N•m).
See Torque Sequence on page 25. Apply
medium-strength (blue) Loctite or
equivalent to the threads.
4
Torque to 50 to 60 in-Ib (5.6 to 6.87 N•m).
5
