|This chapter is independant of the hydraulic system or units of the " D " models. The pressure distributors and regulators are integral parts of many of the hydraulic units. It is therefore essential to know their principles of operation to understand the working of the units.
A pressure distributor is a tap
which will admit or exhaust fluid under pressure to or from one or more
A distributor may also isolate this unit or units from both the " inlet " and the " exhaust " lines.
The Pressure Distributor is generally a slide-valve operating in a sleeve. Only the position of the slide-valve is the controlling factor of the operation of the circuits.
An example of this type of distributor, as used on the " D " model, is the gear selector slide-valve.
The gear-selector slide-valve is hollow, and has 1 inlet for the supply of the fluid at High Pressure and 5 outlets (1 for each gear) to supply the gears.
Longitudinal and circumferential grooves machined in the slide-valve allow the fluid to return to the reservoir from the various circuits. The sleeve has 5 ports, one to supply each gear.
NOTE : The operation of this distributor is independant of the amount of effort applied 10 the slide-valve when it is being moved. Only the movements and positioning of the latter permit the distribution of fluid.
A further type of pressure distributor : The height correctors, the operation of which we saw in chapter 4.
A slide-valve- with two shoulders slides in a sleeve in which there are three ports.
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