Alternate Brake Safety Valve - Operation
Figure 006
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Direct Drive Valve
Figure 007
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The electrical assembly has:
-
a torque motor
-
a pressure transducer
-an electronic amplifier
-
a plug-in type electrical connector.
The hydraulic assembly has:
-
a valve body
-
a liner assembly.
The electronic assembly is installed in a housing on top of the valve body. Clamps and screws attach the torque motor to the valve body. The pressure transducer has a support that connects it to the valve body. The electronic amplifier has a circuit board to which the pressure transducer and the external electrical connector are connected.
The valve body has a distribution bore with drillings that connect to the pressure transducer and external ports P (supply), U (service) and R (return). The bore contains a liner assembly that has a slide valve, a spring and two end fittings. The slide valve can connect two ports at the same time as it moves in the bore. The torque motor has an eccentric shaft which engages vertically with the slide valve through a hole in the body. The spring is installed at one end of the slide valve to take up the clearance between the torque motor shaft and the slide valve. The end fittings seal the liner assembly in the bore.
The electronic amplifier receives a control current of between 0 mA to 32 mA through the electrical connector. The pressure transducer is permanently connected to the port U and gives an output signal in relation to the service pressure at port U. The electronic amplifier receives the output signal from the transducer and, in relation to the control current, supplies a current to the torque motor. The torque motor shaft then moves the slide valve to adapt the service pressure to the control current set.
When the DDV is de-energized (0 mA input current), the slide valve is at the return position. Ports U and R are connected until the service pressure at port U is stable at 7 bar (101 psi). When the DDV is fully energized (32 mA input current), the torque motor moves the slide valve to the supply position. Ports P and U are connected until the service pressure at port U is stable at 175 bar (2538 psi). The return port R is isolated.
1EFF : 401-499, 1 32-43-00Page 16 1 1 Config-2 Aug 01/05 1 1 1CES 1 The pressure transducer continuously monitors the service pressure at port U. If the pressure is more or less than a set value, the electronic amplifier changes the control current to the torque motor. The slide valve moves between the supply position and the return position until the pressure at port U becomes stable at the set value. The return port R is isolated.
A change of the control current changes the control current to the torque motor. The slide valve moves until the pressure at port U becomes stable in relation to the control current set. For each change of control current, a different service pressure is supplied. The higher the current, the higher the service pressure at port U.
(5) Brake Yellow Pressure Transducers 100GG and 101GG
(Ref. Fig. 008)
The pressure transducers send data to the BSCU, ABCU and to the
Triple Indicator (right & left side).
The description is the same as the pressure transducer 96GG (Refer to
32-42-00-00).
B. Alternate HP Manifold Assembly 3016GM
(Ref. Fig. 009)
The manifold assembly is installed in the MLG bay, hydraulic compartment,
on wall C47 right side.
The primary component parts of the manifold assembly are:
-
the alternate brake manifold
-
the alternate selector valve 99GG
-
the pressure relief valve 3067GM
-
the check valve 3058GM
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