-
the check valve 1022GM,

 -
the sampling valve 1187GM,

 -
the pressure transmitter 1065GN (Ref. 29-32-00),

 -
the pressure switch 1151GN (Ref. 29-32-00),

 -
the pressure switch 10-CE-2 (Ref. 27-00-00).

 (2)
 PTU Manifold

 -
the priority valve 1064GM,

 -
the check valve 1093GM,

 -
the solenoid valve (Ref. 32-00-00).

 **ON A/C ALL
 (3) LP Manifold 1003GM
 The LP manifold is the connection point for return lines from different parts of the LP system. It is connected directly to the LP filter (1002GM). Check valve 1024GM is installed in one of the ports of the LP manifold.
 E. System Accumulator 1070GM
R  (Ref. Fig. 018) The system accumulator is a cylindrical type with an internal bladder. The metal body of the accumulator has an outer layer of kevlar to make it stronger. The bladder is made of rubber and isolates the gas (nitrogen) from the hydraulic fluid.
 A gas port is on one end of the body of the accumulator. It is the connection for the gas charging valve and for the gas pressure gage. A hydraulic connection which includes an oil valve is at the other end of the accumulator. It is the connection between the accumulator and the aircraft system. The oil valve stops overpressurization of the bladder.
 The accumulator has a total volume of 1 l (0.26 USgal) and the gas precharge pressure is 130 bar (1885 psi).

R  System Accumulator Figure 018
 1EFF : 1 1 1CES  ALL  1 111 29-11-00 Page 38 Aug 01/05

 F. Nitrogen Pressure Gage 1072GM
 The pressure gage is a direct-reading dial-indicator type. It is attached to the gas manifold which is connected to the gas port of the accumulator. The gage shows the pressure in the accumulator. It indicates up to 3600 psi in steps of 100 psi. The gage is accurate to plus/minus
 2.5 %.
 G. High Pressure (HP) Filter 1048GM
R  (Ref. Fig. 019) The HP filter has three main parts:
 -
the filter head,

 -
the filter bowl,

 -
the filter element.

 The filter head includes the hydraulic connections and the mounting for the attachment of the filter to the structure. The filter head also includes the filter clogging indicator.
 The clogging indicator is a red pin which comes out to show that the filter element is too dirty. The indicator operates when the pressure differential accross the filter is 6.0 + 0.6 - 0.6 bar (87.0 + 8.7 - 8.7 psi). When the red pin is pushed back in, the clogging indicator resets itself. The clogging indicator is latched magnetically. It does not operate if the temperature of the fluid is lower than 0 deg.C (32 deg.F). The indicator starts to operate again when the temperature of the fluid increases to 30 deg.C (86 deg.F).
 An anti-spill device in the filter head operates when the filter element and bowl are removed. It stops fluid coming out of the system or air going in to it when the filter element is changed.
 The filter does not have a by-pass device to let fluid through if the element is clogged.
 The filter bowl holds the filter element. It has a thread to attach it to the filter head. It is not necessary to use tools to tighten the filter bowl in the filter head.
 The filter element is of the replaceable type. It can not be cleaned. The filtration rating of the element is 15 microns.

R  HP and Case Drain Filter Figure 019
 1EFF : 1 1 1CES  ALL  1 111 29-11-00 Page 40 Aug 01/05

R
R
R
R
H. Case Drain Filter 1084GM (Ref. Fig. 019)
 The case drain filter (1084GM) is functionally the same as the HP filter (1048GM). The only differences are in its size and the configuration of the filter head.
 J. Low Pressure (LP) Filter 1002GM
(Ref. Fig. 020)
 The low pressure filter is functionally the same as the HP filter
 (1048GM). The differences between the two types are:

 -
the LP filter is a different size from the HP filter,

 -
the filtration rating is 3 microns,

 -
the configuration of the filter head is different,

 -
the LP filter has an extra port to attach a fluid temperature sensor,

 -
the LP filter has a by-pass device.

 The by-pass device operates when the pressure differential across the filter element is more than 4.0 +0.4 - 0.4 bar (58 +6 -6 psi). It allows fluid to go from the inlet to the outlet without filtration.
 K. Relief Valve 1063GM
(Ref. Fig. 021) The pressure relief valve is of the high-pressure type. It is two-stage valve with a primary pilot valve and a poppet valve. A pressure sensing piston controls the pilot valve, which in turn controls the operation of the main poppet valve. It is set to open at a pressure of equal to or greater than 237 bar (3436 psi) (increasing pressure). It closes again when the pressure drops to 220 bars (3190 psi) (minimum). The valve has a cylindrical body with a mounting flange.
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320飛機維護手冊 AMM HYDRAULIC POWER 液壓2(10)