Dynamic load signal fluid controller with instant on flow amplif

Details Dynamic load signal fluid controller with instant on flow amplif Dynamic load signal fluid controller with instant on flow amplif

1997-06-06

1998-10-13

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Expansible chamber type volumetric responsive measuring...

91467, F16D 3102, F15B 1304

Patent

active

058195327

ABSTRACT:
A fluid controller (17) of the dynamic load sensing and flow amplification type, and including a main fluid path (35,39) having a main variable flow control orifice (43), and a fluid meter (37). Dynamic signal fluid enters a load sensing port (29) of the controller and flows through the fluid meter (37) before the main orifice (43) opens, as the controller valving is displaced from neutral to an operating position (FIG. 5). In accordance with the invention, in addition to the normal load sensing drain orifice (LD1) which closes just about the time the main orifice (43) opens, there is provided a load sensing drain orifice (LD2) which remains open somewhat after the main orifice (43) and an amplification orifice (50) open, to prevent build-up of pressure upstream of the fluid meter (37). As a result, there is no flow through the fluid meter (37) until after the amplification orifice (50) opens, and the flow amplification capability appears to the operator to come on instantaneously.

REFERENCES:
patent: 4759182 (1988-07-01), Haarstad
patent: 4958493 (1990-09-01), Schutten et al.
patent: 5303636 (1994-04-01), Stephenson et al.
patent: 5329766 (1994-07-01), Yamaguchi et al.
patent: 5620026 (1997-04-01), Stephenson et al.
patent: 5638864 (1997-06-01), Haarstad et al.

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