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British Industrial History

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Caprotti Valve Gears

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Caprotti Valve Gears Ltd

The Caprotti valve gear is a type of steam engine valve gear invented by Italian architect and engineer Arturo Caprotti.

1922 The Caprotti valve gear was tested on a goods locomotive on the Italian State Railways[1]

1927 William Beardmore and Co acquired sole license rights for manufacture and sale of Caprotti Valve Gear in the U.K.[2].

1930 William Beardmore and Co had played a prominent part in the development of Caprotti Valve gear for both marine and railway use[3].

1933 A reorganization of the basis of the relationship between William Beardmore and Co and Caprotti Valve Gears Ltd was implemented at this time but details not published[4].

1936 It was announced that the interests of Associated Locomotive Equipment Ltd have been identified with those of Caprotti Valve Gears Ltd and that Mr F. J. Kuretschka was now managing director of both companies[5].

1936 Alternative arrangements for manufacture of Caprotti valve gear for William Beardmore and Co were under discussion due to the recent announcement of the association of interests of Caprotti with Associated Locomotive Equipment who were owners of the competitor Lentz poppet valve[6].

1937 The chairman of Heenan and Froude, Alan Good, and managing director, W.M. Ratcliffe, joined the board of Caprotti Valve Gears Ltd[7].

1937 Heenan and Froude had identified another speciality product that would balance their production of refuse disposal plant[8]. This was later announced to be locomotive gears, which was implemented through an association with Caprotti Valve Gears Ltd in which Heenan and Froude had taken a substantial share interest[9].

1944 The trading rights and interests of Caprotti Valve Gears Ltd., a subsidiary of Heenan and Froude, were acquired by Associated Locomotive Equipment Ltd of Worcester[10].

1945 Heenan and Froude acquired the holding in Associated Locomotive Equipment Ltd from Caprotti Valve Gears Ltd. This company now controlled all of Heenan and Froude's trading and patent rights in valve gears[11].

1945 Caprotti Valve Gears Ltd was merged into Associated Locomotive Equipment Ltd which now concentrated on diesel electric traction[12].

See Also


Sources of Information

  1. The Engineer 1922
  2. The Times, 23 Decmeber 1927
  3. The Times, 17 July 1930
  4. The Times, 29 June 1935
  5. The Times, 6 June 1936
  6. The Times, 18 June 1936
  7. The Times, 26 October, 1937
  8. The Times, 25 November 1937
  9. The Times, 17 November 1938
  10. The Times, 19 December 1944
  11. The Times, 2 January 1945
  12. The Times, 24 December 1945