Mechanical Egr Valve; Reed Valve - Kubota WSM 07-E3B Series Workshop Manual

07-E3B SERIES, WSM

(3) Mechanical EGR Valve

(4) Reed Valve

Mechanical EGR valve (2) controls the flow of cooled
EGR gas (c) to the intake manifold.
If the boost pressure (b) is low, EGR valve (2) is
closed, so cooled EGR gas (c) does not flow to the intake
manifold (e).
If the boost pressure (b) is getting higher, EGR valve
(2) is opening and cooled EGR gas (c) is flowing to the
intake manifold (e).
(1) Thermo Valve
(2) Mechanical EGR Valve
(3) EGR Valve Lift
(4) Boost Pressure
The reed valve (2) is provided at the confluence of
exhaust gas after passing the EGR valve (1), and intake
air. It operates by the pressure difference between inside
of the crankcase and the atmosphere, and prevents
back-flow of the mixture of exhaust gas and intake air
generated by the piston and valves. It is used as the
secondary air introduction
countermeasure against exhaust gas of four-cycle
engines.
(1) Mechanical EGR Valve
(2) Reed Valve
(3) Reed Valve Housing
(4) Intake Manifold
M-20
ENGINE
(a) Boost Pressure from Inlet
Manifold
(b) Boost Pressure from
Thermo Valve
(c) Cooled EGR Gas
(d) Coolant
(e) Cooled EGR Gas To The
Intake Manifold
(f) Close
(g) Open
W1176088
device for the
(5) Valve
(6) Case
(7) Stopper
(8) Screw
W1176594
KiSC issued 06, 2020 A