LANDI RENZO S.p.A.
Installationand adjustament manual CN04
6/16
Legend
Specification
Thank you for purchasing this
LANDI RENZO
version ‘
CN04
’ pressure regulator, a reliable and
technologically advanced device for the conver-
sion of vehicles with catalytic converter and engi-
ne with fuel injection system or carburettor to
methane. Correctly installed it will give its user
many years of excellent service To ensure that you
obtain the maximum performance from your con-
version system, please read these installation and
adjustment instructions carefully.
LEGEND
(FIG. 1-2)
A) Gas outlet
B) Throttle adjustment screw.
C) Solenoid valve positive and negative contact.
D) Safety valve.
E) Water outlet connector to attach to an engine
water circuit outlet pipe.
F) Water inlet connector to attach to a return pipe
of the engine water circuit.
G) Gas Inlet.
H) Bleed tap.
I) Pressure sensor.
1. TECHNICAL SPECIFICATION
Electronically controlled device that reduces the
methane pressure, permitting a regular flow of gas
for all engine demands. It is equipped with three
pressure reduction stages, providing stability at
both high and low supply pressures, as the amount
of gas supplied changes, and a low pressure
solenoid valve upstream of the third stage. Heat
absorbed from the pressure regulator elements
heated with the engine cooling circuit fluid ensures
that the pressure regulator does not freeze during
the pressure drop phase. The flow of gas needed
for the engine to idle is activated by a dedicated
solenoid valve, and supplied through the main flow
gas pipe. Equipped with an electronic starting
device incorporating a safety system that interve-
nes to close the gas solenoid valve when the
engine is turned off, including accidentally.
CHARACTERISTICS:
Methan pressure pressure regulator with 3 reduc-
tion stages.
Application:
automotive traction, suitable for vehicles with ca-
talytic converterr and engine with fuel injection
system or carburettor.
Fuel type:
CNG (Compressed methan gas).
Heating:
by engine cooling fluid.
Operating temperature:
from -40° TO 120°C.
Supply voltage:
12 volts nominal;
operating field from 8 to 16 volts.
Test pressure:
390 bar
Inlet pressure:
Minimum 15 bar
Maximum 260 bar
Bursting pressure:
> 400 bar
1st stage adjustment pressure:
4 bar
2nd stage adjustment pressure:
1.5 bar
Safety valve opening pressure:
6.5 bar
Max loss:
< 15 Ncm3/h (aIr)
Indicative service life:
about 100,000 Km
Maximum METHANE flowrate:
18.1 Kg/h
Vehicle maximum power:
up to 100 Kw
Weight:
about 1.6 Kg.
Type approval E13110R 000101
2. FUNCTIONING OF THE PRESSURE
REGULATOR
(FIG. 1-2-3)
The methane passes through the pressure regu-
lator inlet (1), passes through the pipe (3) and the
first stage valve(4), and enters the first stage
chamber(3). The pressure exerted by the gas on
the walls of the chamber dilates the first stage
membrane (8), overcoming the resistance of the
calibrated spring (9). Since the membrane (8) is
attached to the lever (6) with fulcrum at (5), it acts
on the first stage valve (4), opening and closing it
to create a pressure balance. From the first stage
chamber (7), the gas passes into the second stage
chamber (11), and its flow rate is regulated by the
pressure exerted by the gas on the membrane
(10), which dilates and overcomes the resistance
of the spring (15) to operate the lever (12) which
adjusts the opening and closing of the first stage
valve (13). Depressurising the engine causes an
axial movement of the third stage membrane (23),
which is connected to the lever (16) and thus
opens the valve (18) allowing the gas to reach the
3
rd
stage chamber and then, across the spool (2)
through the pipe to the engine.
Functioning