Free delivery return valve and associated system

Details Free delivery return valve and associated system Free delivery return valve and associated system

1977-02-08

1979-04-10

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

60695, 1375135, 137560, 181237, 251281, 251368, G05D 701

Patent

active

041483375

ABSTRACT:
A free delivery controlled return valve, of the type employed in fluid power hoisting apparatus, which controls the speed at which a load is lowered as a function of load magnitude. An improved valve structure is disclosed which overcomes false load signals, such as those generated when the hoisting apparatus' lift cylinders are fully extended against a stop, and which thus permits the load platform to descend at an appropriate speed. An improved fluid sonic muffler is also disclosed.

REFERENCES:
patent: 353062 (1886-11-01), Hill
patent: 2761737 (1956-09-01), Nurkiewicz
patent: 3093359 (1963-06-01), DeWoody
patent: 3223111 (1965-12-01), Anderson
patent: 3421545 (1969-01-01), DeMarco
patent: 3433253 (1969-03-01), Tomer
patent: 3589677 (1971-06-01), Segers
patent: 3665965 (1972-05-01), Baumann

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