tolerance: Nominal +/- 4% (CEN European
The Results of Long Research and
is now possible to manufacture ”hand- and
custom-made” nozzles in very small series.
However, quite a different requirement is
needed, of course, when it comes to a mass
production of millions of nozzles a year to meet
the needs of the market. This exponentially
increases the problem of consistency, high
performance, uniformity and quality.
To move from a “laboratory development” to a
quantity production stage involves, beside the
mastering of all construction parameters, an
adaptation to the constantly evolving
manufacturing and combustion techniques which
remain the basis of our profession. A perfect
control of this continuing evolution is
responsible for the reputation of MONARCH
Thus, MONARCH has become the engineers preferred
nozzle around the world. This success has made
it our duty not only to comply with the
requirements set up by the leading burner
manufacturers, but also to take into account the
needs of servicemen to make sure, nozzle by
nozzle, box by box, that no problems arise that
would necessitate a call back, which is always
very costly for the service company.
The MTD-92 nozzle was created to give a maximum
satisfaction to all users. To achieve this, not
only is the MTD-92 nozzle manufactured with the
greatest care, but every nozzle is individually
spray tested to guarantee perfect conformity
and-control of the flow rate, spray angle,
uniformity and consistency.
Extension of Unexceptional Venture
Once again, we confirm our commitment to
manufacture high-precision nozzles only, in
conformity with the highest possible
manufacturing, testing and reliability criteria
of the moment. Therefore, using a MONARCH nozzle
guarantees for you and for your customer the
best end longest-lasting performance level and
guarantee remains our constant concern, as well
as our greatest pride. The MTD-92 nozzle
combines the qualities which have made MONARCH’s
name famous, with both advanced technology and
strictly controlled precision corresponding to
the trends and requirements of the market.
As a result, we have been able to meet the
demand for high performance, due mainly to our
-long-standing experience and skill, and to an
ever-developing technological base that has
created MONARCH’s worldwide reputation as the
leading manufacturer of nozzles for domestic oil
Monarch Nozzle Spray Patterns
Monarch Nozzle "R" spray patterns ,
Monarch Nozzle "NS" spray patterns , Monarch Nozzle "AR"
spray patterns, Monarch Nozzle "PLP" spray patterns, Monarch
Nozzle "PL" spray patterns, Monarch Nozzle "HV" spray
patterns, Monarch Nozzle "HO" spray patterns
Monarch Nozzle Technical Data
tolerances for the dimensions above hold for all nozzles up
to and including 3.50 USGPH. They can be slightly different
for higher capacities.
The body and swirl disc are made of a high chrome grade
stainless steel (416 SS), specially selected for its high
The locknut is nickel plated to avoid all risk of even a
partial obstruction by metal particles.
The nozzle body and orifice are made of a one piece
construction. Although expensive, this procedure guarantees
against possible leakage or heat expansion related problems.
recently developed a Computer Laser System to monitor
quality and homogeneity of spray patterns and angles. This
laser controlled measuring device is computer-guided to
provide high precision monitoring of nozzle tests. When
tested, the nozzle is analyzed by the Laser System; the
results are simultaneously computer-processed and compared
with Master Reference Nozzles. This method enables MONARCH
to assure uniformity and consistency of nozzle production as
compared to the reference samples.
ATTENTION: Considering the high precision level,
demonstrated by flow tolerances, and the extremely high
precaution measures in manufacturing, we strongly advise you
not to disassemble the MTD-92 nozzle; the original precision
will not be recovered. The problem posed is that of a
maximum filtration guarantee. This is why MONARCH has chosen
to use porous bronze filters with a straining capacity of 40
to 60 microns or 200 mesh (approx. 70 microns) strainers,
for capacities up to and including 1.00 USGPH.
Monarch Nozzle Critical Points
nozzle tip (7) and swirl disc (2) are made of a high chrome
grade stainless steel to guarantee high heat resistance. The
internal parts are protected by a high-efficiency filter
The disc: the size of the slots (1 ) regulates fuel flow
rate and path.
The swirl chamber (6) determines spray velocity. All parts
are closely fitted owing to precise production and micro
The internal locknut (3) is nickel plated and has a
hexagonal center hole to prevent all danger of choking by
metal particles from a jammed part.
Perfect expertise and precision are necessary to manufacture
the tangential slots (1) and orifice, acquired through long
years of study and research focusing on the very conception
of the nozzle and the use of modern tool and production
The extremely close manufacturing tolerances (in microns) as
well as the super finish of the surface between the nozzle
tip (7) and the disc (2) secure a perfect flow of the fluid
through the disc’s orifices and determine the flow rate and
The body or adapter (8) fastens the nozzle into the fuel
HO Monarch Nozzle
series is offered to meet the requirement for Nozzles to be
used on higher viscosity oils at elevated operating
pressures. It is a redesignation of the PLP-HO, PL-HO and
R-HO series to simplify specifications for ordering. These
Nozzles (as with all Monarch Nozzles) are stamped with their
nominal flow rate at 100 PSIG on No. 2 fuel oil and are
available in capacity sizes from 1.00 through 100.0 GPH.
200 PSI: When regular light oil Nozzles are used on more
viscous oil, their sprays tend to “flutter”, they produce a
narrower spray angle and often develop streaks in the spray.
Accordingly, the standard “HO” Nozzles are specially tested
for spray quality and rated for spray angle at a pressure of
200 PSIG (14 bars) on 70 SSU (13 Centistoke) operating
viscosity oil. This special testing assures that the Nozzles
will perform properly under heavy oil operating conditions.
430 PSI: For very high pressure operation, the HO Nozzles
are also tested for spray angle and spray quality at 430
PSIG (30 bars) on 70 SSU operating viscosity oil. The
special additional testing is necessary to be sure that no
streaks, voids, or flutter appear in the spray at these
pressures that would not appear at 200 PSIG.
HO Nozzles : The accompanying chart shows approximate flow
rates when operating from 200 PSIG through 450 PSIG on 70
SSU operating viscosity oil, specific gravity .846. Note
that the nominal flow rates stamped on the Nozzles are based
on 100 PSIG using U.S. No. 2 fuel oil, subject to a flow
tolerance of plus or minus 5%. Flow rates shown at 300 PSIG
on 70 SSU operating viscosity oil are from actual tests.
Flow rates at higher and lower pressures are rates predicted
from the 300 PSIG data. Actual flow rates may vary,
depending on exact operating conditions.
Nozzles for operation at 200 PSIG are available in 45°, 60°
and 80° spray angles in sizes of 2.25 GPH up to and
including 45.00 GPH, and sizes of 50.00 GPH and up are
available only in 60° and 80°. Nozzles for operation at 430
PSIG are available in 45°, 60° and 80° in sizes 1.00 GPH up
to and including 45.00 GPH. Sizes of 50.00 GPH and up are
available only in 80°. Strainers are not included with
Nozzles but 120 mesh Monel Strainers may be ordered
separately. Strainers are specifically not recommended for
use on sizes over 50.00 GPH, as restriction may occur.
Ordering: Specify flow rate, spray angle, Series (HO) and
quantity desired. If adaptors or 120 mesh strainers are
desired they must be ordered separately. Specifications:
Tip, disc and locknut fabricated of high chrome, heat
resisting stainless steel. HO
Monarch Nozzles Chart
BPS By-Passing Monarch Nozzle
nozzles produce variable orifice flow rates by by-passing
fluid from the nozzle swirl chamber. The orifice flow is
regulated by controlling the by-pass line pressure.
nozzle tip and disc are made of the same heat resisting,
high chrome grade of stainless steel used in our simplex or
regular domestic oil burner nozzles. The combination
locknut-strainer support is made of brass with a Monel
strainer screen and a Teflon seal (Viton “O” rings are
special order). Nozzle adaptors (bodies) and fittings are
made of brass. Nozzles in all sizes are furnished only with
strainers, 120 mesh Monel up to and including 13.50 GPH and
80 mesh on larger sizes.
The BPS nozzles are designed and tested for operation at 100
psi. on No. 2 fuel oil, with the capacity and spray angle
stamped on the nozzles at these conditions. Both the
capacity and spray angle rating are based on having the
by-pass line closed. Spray angle widens 5°-10° with the
by-pass line open.
The chart shows the orifice flow rates at specific by-pass
line pressures and also the maximum pressure in the by-pass
line when the by-pass is closed.
The BPS nozzles can be supplied with spray angles as
follows: 30° in capacities from 3.00 GPH up to and including
30.00 GPH; 45° in capacities from .75 GPH up to and
including 35.00 GPH; 60° in all listed capacities, 80° in
capacities from 1.50 GPH up to and including 35.00 GPH, and
90° from 10.50 GPH up to and including 24.00 GPH.
is possible to operate standard BPS nozzles up to 250 psi.
line pressure, and at this pressure they will handle up to
70 S.S.U. operating viscosity oil. The BPS nozzles can be
specially tested for operation at line pressure of 300 psi.
or more at additional cost.
BY-PASS PRESSURES VS. ORIFICE FLOWS. Shown is a pressureflow
chart for the 6.00 GPH BPS nozzle operating at 100 psi. oil
line pressure on No. 2 fuel oil. The total flow through the
nozzle orifice and the by-pass line when the by-pass is
completely open is considerably more than the rated capacity
of the nozzle, per last column of chart above. For capacity
sizes larger than those indicated as available, we refer you
to the E-180-H and E-179-H variable flow nozzles. click here
BY-PASSING NOZZLE ADAPTORS. The H-730-C by-passing nozzle
adaptors are 2-1/16″ long, made of 3/4″ hexagon brass and
are furnished with either 1/8″ or 1/4″ female N.P.T. oil
inlet connections. They are equipped with a brass fitting on
the side to accommodate 1/4″ O.D. tubing for the by-pass
line, and the distance between centers of the feed line and
the by-pass line is 11/16″. A duel by-passing adapter,
H-711, is also available to take two (2) BPS nozzles. Due to
the necessity of combining inlet and by-passing flows of the
two nozzles, the single inlet of the H-711 is 1/8″ female
N.P.T. located on the side of the adapter and the single
by-pass is 1/4″ female N.P.T. located at the rear of the
adapter. The H-711 is made form 3/4″ x 1-3/4″ rectangular
brass stock and is 2-1/8″ long.
BPS By-Passing Monarch Nozzles Chart
Monarch Nozzle | Service and Storage Accessories in
All types of Nozzles are available in Mumbai
(India) | We are leading importers, distributors
and stockists of Monarch Nozzle in India since 1996 - 97
(Yash Hitech Systems)