Valve mechanism for controlling a pressure difference between an

Details Valve mechanism for controlling a pressure difference between an Valve mechanism for controlling a pressure difference between an

1990-10-03

1992-08-25

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91417R, 91437, 91440, 7245315, 100269R, F15B 1316

Patent

active

051408953

ABSTRACT:
A double acting hydraulic cylinder is a die cushion for a press, with an upper and a lower chamber in communication with each other and with a differential pressure between the two chambers automatically controlled by a valve mechanism. With the differential pressure controlled according to one of several desired curves, the die cushion capability during press operation can be changed and adjusted to a valve suitable for the product to be processed and so a wide variety of products can be produced in high quality and high efficiency.

REFERENCES:
patent: 1408608 (1922-03-01), Kreyer
patent: 2984980 (1961-05-01), Rowles et al.
patent: 3574999 (1971-04-01), Nectoux
patent: 4282798 (1981-08-01), Barlow et al.
patent: 4382360 (1983-05-01), Dummer
patent: 4396215 (1983-08-01), McCutcheon
patent: 4520626 (1985-06-01), Nokajima et al.
patent: 4796428 (1989-01-01), Hall
Pippenger, et al, Industrial Hydraulics, copyrighted 1979.

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