Summary of the folder "Hydraulic components" (Box No. 2), 1949-1970

The period summary of the "Hydraulic components" folder (Box No. 2) lists sixteen technical documents by Paul Magès, from 1949 to 1970: pumps, pressure regulator, valves and hydraulic fittings.

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Understanding this document

In this document

This is the period summary of the "49-66" folder titled HYDRAULIC COMPONENTS (Box No. 2) from the Paul Magès archives. The document is presented as a two-column table, "DATES" and "SUBJECTS", listing sixteen items p. 2.

Chronological list of items

Date	Subject	Page
1949	Viscosity curves	p. 2
1949	Schematic diagram of the DS 19 hydraulic circuit	p. 2
21-11-1949	Study of the self-regulating pump with accumulator	p. 2
07-10-1953	Principle of the hydraulic pressure regulator	p. 2
20-01-1956	2nd addition to patent P. 685 691 of 15 February 1955, flow regulator	p. 2
02-12-1957	Problem of bearing ball durability for DS H.P. pump	p. 2
11-1958	Flow curves of DS H.P. pump	p. 2
25-11-1958	Request to the Laboratory for a pre-production run of 100 DS H.P. pumps	p. 2
11-1958	Drawing of the DS H.P. pump no. E 401.8444	p. 2
12-1959	Deferred patent of invention, three-way valve with adjustable overlap	p. 2
20-06-1961	3 studies by Paul Magès on the three-way distribution valve with adjustable overlap	p. 2
18-07-1964	Study of a single-cylinder pump (improvement to pumps)	p. 2
01-1964	Study of a permanent magnet pressure regulator	p. 2
17-02-1966	Study of a multiple fitting for fluid piping	p. 2
1966	Assembly drawing of cylinder and suspension sphere for vehicle Y	p. 2
15-06-1970	Study of an electrically controlled progressive valve	p. 2

The table is bordered by a simple vertical bar separating the two columns, with no other annotation.

Context

This summary covers a period ranging from the development of the DS 19 (1955) to the beginning of the 1970s, representing a large part of Paul Magès' career at Citroën as the designer of the hydropneumatic suspension.

The "vehicle Y" mentioned for 1966 corresponds, in the internal vocabulary of Citroën design offices at the time, to a project code name — general context information, not specified in the document itself.

The pressure regulator and the high-pressure pumps cited here are central components of the Citroën hydraulic system, ensuring respectively the pressure regulation of the circuit and the supply of high-pressure fluid to the suspension spheres and braking system.

Archivist's perspective

This summary constitutes a key navigation piece in the Magès collection: it allows for the reconstruction of the order and classification logic intended for the "Hydraulic components" folder, and therefore to locate each technical document preserved in box no. 2.

It seems that this folder covers the entire life cycle of an invention — from the preliminary study to the patent, then to testing and production — as shown by the sequence between the flow regulator patent (20-01-1956) and the subsequent studies on the three-way valve (20-06-1961).

Several items listed here are already digitised and available for consultation, notably the Comparative viscosity and distillation curves of a silicone, the Schematic diagram of the DS 19 hydraulic circuit and the Technical note on the self-regulating pump with accumulator, which confirms the consistency of this summary with the actual content of the box.