Operation2751−1/A1
Winterthur Gas & Diesel Ltd.
4/ 6
Key to Fig. 2: Exhaust Valve and Leakage Oil Drain
1 Valve cage 12 Thrust piece
2 Lower housing 13 Connection (hydraulic oil)
3 Upper housing 14 Orifice
4 Outside piston 15 Cup spring
5 Inside piston 16 Rotation wing
6 Valve spindle 18 Valve stroke sensor
7 Guide bush 19 Valve seat
8 Piston guide 20 Cylinder cover
9 Distance ring
10 Air spring piston AS Air spring
11 Damper HO Hydraulic oil (high pressure)
2. Function
2.1 Open
When the piston in the exhaust valve control unit operates, hydraulic oil (HO) flows
through the connection (13) into the upper housing (2). The outside piston (4) and the
inside piston (5) move down.
The air spring piston (10), which is attached to the valve spindle (6), moves down
against the pressure in the air spring (AS) and the exhaust valve opens. The force of
the exhaust gas on the rotation wing (16) turns the valve spindle.
2.2 Close
When the hydraulic oil pressure from the exhaust valve control unit decreases (i.e.
when the control rod in the exhaust valve control unit opens the related relief bores)
the pressure in the air spring (AS) pushes the air spring piston (10) up.
The valve spindle (6) then pushes the inside piston (5) and the outside piston (4) up
and the exhaust valve closes. The hydraulic oil in the upper housing (3) flows back to
the exhaust valve control unit.
2.3 Hydraulic System
Hydraulic oil and air in the system flow continuously from the upper housing (3,
Fig. 2), outside piston (4) and inside piston (5) into the leakage oil collection space
(LS, Fig. 3).
This leakage oil / air then drains though the leakage oil drain (LD). The hydraulic oil
that flows through the internal bores of the valve control unit continuously keeps the
correct oil quantity in the hydraulic system.
2.4 Air Supply to Air Spring
Compressed air flows into the air inlet connection (AI, Fig. 3) and through the
non-return valve (17) to the inlet bore (IB). The compressed air then flows into the air
spring (AS). When the exhaust valve opens the air spring piston (10) moves down,
which compresses the air in the air spring (AS). Some of the compressed air flows
back through the inlet bore (IB). After the exhaust valve closes, compressed air flows
into the air spring (AS) again.
Exhaust Valve
2014
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