Improvements in and relating to the Control of Variable-Displacement Pumps

  • Inventors:
  • Assignees: Abex Corp
  • Publication Date: May 28, 1970
  • Publication Number: GB-1193339-A


1,193,339. Valves. ABEX CORP. 31 Aug., 1967 [9 Sept., 1966], No. 39960/67. Heading F2V. [Also in Division G3] A valve used to control a variable displacement pump (see Divisions G2-G3) has a rotary spool 92 provided with two pairs of diametrically-opposed grooves 95, 96 which co-operate with ports 85, 88 in a follow-up sleeve 82 to connect inlet 78 and drain port 79 alternately with work ports 77, 80. The spool has a handle 61 and is biased to a closed position by springs 70 acting on a radial pin 101. Microswitch 107 has an operating plunger 69 co-operating with a notch 109 in stem 99.




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    EP-0135068-A1March 27, 1985Hitachi Construction Machinery Co., Ltd.Système de détection de mauvais fonctionnement pour pompes hydrauliques