Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 158 of 165 TD/TAD4 Manual Rev 4
12.8.1 Pressure Regulation
A pressure regulating valve is provided as a
standard feature of the pump.
It is located within the pump body and
consists of a steel piston with P.T.F.E. wipers
that slides in a honed steel bore.
Pressure is exerted on the piston itself by a
spring, the loading of which is adjustable by
the user.
The pressure of the oil bears on the cross
sectional area of the piston.
When oil pressure and spring force balance,
the piston lifts and permits by-passed oil to
return to the suction port.
The accuracy of the machining and honing
ensures that the close fitting piston is kept in
contact with the cylinder bore by the pressure
of oil acting on its annular area
This combination of material selection and
fine tolerance eliminates edge filtration,
prevents sticking in operation and reduces
hysteresis effects to an absolute minimum.
The Dunphy DH Series of oil pumps has been
purposefully designed, in-house, to a
demanding brief, by experienced engineers
who have learned, at plant level, what
qualities the user demands of an oil pump.
As a result the DH oil pump has been
designed up to an extremely high quality
standard.
For heavy oil installations, the DH pump can
be fitted with a restrictor which will allow oil
from the ring main system to circulate
through the flexible oil lines and also the
pump body when the burner is not running.
This facility eliminates the need to insulate
the pump and the flexible's and ensures that
both are kept at the correct temperature.
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