Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1996-11-25
1999-01-12
Michalsky, Gerald A.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13711515, 13711523, G05D 1610
Patent
active
058574794
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a precontrolled three-way pressure reduction valve having a hollow piston separating a working liquid space from a control liquid space.
These pressure reduction valves readily tend to oscillate, so that special measures must be taken in order to stabilize them. The connecting openings between the surrounding groove of the control piston and the working liquid space are provided in large number over the circumference and arranged in two rows so that a good distribution of the working liquid from the groove into the working liquid space which is in communication with the consumers, and vice versa, is assured. This requires a considerable expense for the manufacture of the control piston, which is developed as hollows piston having a partition.
SUMMARY OF THE INVENTION
The object of the present invention is to obtain, at little cost of manufacture, a pressure reduction valve which operates substantially free of oscillation. This is surprisingly achieved by providing a working liquid space located in the control piston and having a T-shape with axial and transverse bores, there being a groove encircling the control piston and communicating with the transverse bore. Due to the fact that the working liquid space is developed as a T-channel, excessive eddying of the work liquid in this space is substantially prevented, so that a high degree of stability during the control process can be obtained as a result of this specific guidance of the working liquid. Furthermore, the stability of the control process is additionally favored by the special development of the damping choke which is arranged in front of the precontrol valve. The development of the T-channel of the working liquid space formed by the main control piston requires merely a longitudinal bore which debouches into a transverse bore.
BRIEF DESCRIPTION OF THE DRAWING
With the above and other objects and advantages in view, the present invention will become more clearly understood in connection with the detailed description of a preferred embodiment, when considered with the accompanying drawing in which the sole FIGURE is an axial section through a precontrolled three-way pressure reduction valve according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The precontrolled three-way pressure reduction valve developed in cartridge form has a sleeve 1 which forms the housing and which is screwed by a thread la in liquid-tight manner by means of a sealing ring 32 into an internal thread in a receiving housing 31. This receiving housing 31 has channels 33 and 34 which are in liquid communication with circumferential grooves 36 and 37 in the sleeve-shaped housing 1. The channel 33 communicates with the pump connection, and the channel connection 34 communicates with the tank connection. The circumferential grooves 36 and 37 are separated from each other by a sealing rib 40 with sealing ring 41. The other sealing ring 43 seals the circumferential groove 36 off from the consumer connection 45. The bore portion 46 of the housing sleeve 1 is developed as cylindrical guide for the control piston 47. The control piston has a partition 48 which separates the working liquid space 49 from the control space 50. In the central region, the partition wall has a throttle bore 51 through which control liquid flows from the working liquid space 49 into the control space 50. The working liquid space 49 is developed in T-shape, consisting of a transverse bore 53 which an axial bore 54 debouches. The transverse bore 53 debouches into a surrounding groove 56 the limiting walls 56a, 56b of which form control edges which cooperate with radial bores 58 and 59 in the housing sleeve 1. In the case of the present embodiment, six radial bores 58 and six radial bores 59 are, for instance, arranged distributed uniformly on the circumference of the sleeve 1. The radial bores 58 are in communication with the surrounding groove 36 which, in its turn, communicates with the pump channel 33. The
REFERENCES:
patent: 2971524 (1961-02-01), Ruhl
patent: 4531707 (1985-07-01), Dotti et al.
patent: 4676273 (1987-06-01), Stoltman
patent: 5251660 (1993-10-01), Hori et al.
Pippenger J.J. `hydraulic cartridge valve technology`1990. Amalgam Publishing Company, USA p. 142.
Cords Karl
Machat Gotz-Dieter
Meyer Karl-Josef
Schulte Michael
Stroka Wilfried
Farber Martin A.
Mannesmann Rexroth AG
Michalsky Gerald A.
LandOfFree
Precontrolled three-way pressure reduction valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Precontrolled three-way pressure reduction valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precontrolled three-way pressure reduction valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1506058