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Патент USA US2127679

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1938. '
Ai.; c. DUDLEY
Filed April 28, 1957
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f' Patented Aug. 23,1938
ïs-ra'rss Param @Price
2,127,679 '
Edward Clifford Dudley, Fresno, Calif.
Application April 28, 1937, Serial No. 139,370
1 claim.4 (c1. 251-108)
This invention relates generally to a hydraulic
control valve and in particular relates to an im
proved hydraulic control valve, o-f the four-Way
type, for use in connection with double acting
hydraulic control cylinders as noW commonly
used in connection with tractor drawn learth
working and moving implements'such as carrier
Scrapers, etc., the valve being interposed in the
conduits between the constant pressure pump on
10 the tractor and the control cylinder on the
The principal object of the> present invention
is' to provide a novel porting arrangement in a
four-Way control valve of the plug type. The
15 porting is so disposed that when the valve is
in a central or neutral position, the high pres
sure oil from the pump will by-pass back‘to the
oil reservoir onl the tractor and when the valve
is turned in one direction or the other to feedv
20 oil ‘under pressure to one side of the double
acting control cylinder on the implement, the oil
from the other side of the cylinder is ley-passed
through the valve -and back to the oil reservoir.
A further object of the invention is to produce
25 a simple and inexpensive device and yet one
which will be exceedingly eiîective for the pur
pose- for which it is designed.
These objects I accomplish by means of such>
structure and relative arrangement of parts as
30 will fully appear by a perusal of the following
specification and claim.
The head 5 is provided with an enlarged bore
6 below its stem journaling portion and openV at
its inner end and thus in communication with a
chamber ‘I formed between the'inner face of the
head and adjacentend of plug 2. An oil seal 8, 5
of suitable type, is disposed about the stem and
in the bottom of bore 6. A compression spring
9 is disposed about the stem between the oil
seal 8 and the adjacent end of plug 2; said
spring normally being under compression and
urging the plug into the tapered bore. If de
sired, a washer I0 may be disposed between the
oil seal and spring 'whereby to increase the com
pression of spring 9 for the purpose hereinafter
The shell I is provided with two oppositely
disposed, radial ports indicated ,at I I and I2 re
spectively. Another radial port I3 is disposed
centrally between the ports II and I2 while a
fourth port I@ is formed in the shell axially rela- '
tive to the plug and communicates with the bot
tom of the tapered bore which forms pocket 3.
The tapped radial ports II and l2 are the sup
ply ports from which the conduits (not shown)
lead to the double acting hydraulic control cyl
inder; the radial port I3 is the by-pass port
which is connected to the oil supply reservoir;
and the axial port I@ is the high pressure feed
port adapted to be connected to the pump.
The plug 2 is formed with an L-shaped passage 30
I5 Which is open at one end to the small end of
In the drawing similar characters of reference
indicate corresponding parts in the several
Figure 1 is an elevation of my improved hy
the plug and open ‘at the other end through the
side wall of the plug in the plane of the radial
ports. The plug is also formed with a pair of
outwardly facing, opposed parallel grooves I6 and
draulic control valve.
Figure 2 is a sectional elevation on line 2_2Of Fig.` l.
Il respectively cutA transversely therein; said
valve in an operative position. .
ing communication between pocket 3. and cham
grooves also being disposed in the plane of the
radial ports and at right angles to the axis of
Figure Seis a cross section takenv online 3_3 » ports I I and I2 when passage I5 and port I3 are
of Fig. 2, and illustrates the valve in a neutral in full register as shown inFig. 3. A bleed open
or by-passing position.
ing I8 extends longitudinally through the plug to
Figure 4 is a similar Viewl but illustrating the one side of passage l5; said bleed opening aiîord
Referring now more particularly to the char
acters of reference on the drawing, the device
comprises a valve shell I bored from one end to
receive a tapered plug 2; the _plug when dis
posed in the bore terminating short of the bot
tom thereof to form a pocket as shown at' 3.- An
axial stern ¿I projects from the enlarged end of
the plug 2 some distance beyond the adjacent
end of the valve shell; a control handle H pro
jecting radially from the outer end of the stem.
A head 5 is threaded into the initially open end
of the shell and forms a journal for stem t.
ber 1.
In use my improved hydraulic control valve is
mounted in any. suitable manner on the tractor,
and connected between the pump and double act
ing hydraulic control cylinder in the manner here
tofore described.
When the valve is in a-neutral or central posi- "
tion as l.shown in Fig. 3, the L-shaped passage l5
in the plug is in register with- radial port I3 and
axial port Id thus allowing of unrestricted by
passing of oil from the constant pressure pump
back to the reservoir. However when the plug is
- turned in one direction or the other a predeter
mined distance either radial port I I or I2 is placed
in communication with the passage I5 thus feed
ing oil under pressure to one side of the double
acting hydraulic control cylinder on the drawn
At the same time one of the grooves
I6 or I'I will be brought into register between
radial by-pass port I3 and the other radial supply
port relieving the pressure on the other. side of
the control cylinder. Figure 4 of the drawing
illustrates the position of the plug when oil is be
ing supplied to portII and lay-passed from port
I2. To control the operation of the double acting
control cylinder, it is therefore only necessary to
swing the handle H of the valve to one side or the
other of its neutral or» central position.
From the foregoing description it will be readily
seen that I have produced such a device as sub
stantially fulñlls the objects of the invention as
set forth herein.
While this specification sets forth in detail the
present and preferred construction o! the device,
still in practice such deviations from such detail
may be resorted to as do not yform a departure
N) from the spirit of the invention, as deñned by
the appended claim. '
Having thus ‘described my invention, what I
claim as new and useful and desire to secure by
Letters Patent is:
In a hydraulic control valve including a shellP
and a rotatable plug disposed therein, a radial
by-pass port in the shell, a. pair of feed ports in
the shell, the radial by-pass port being disposed
centrally between said feed ports and in the same
plane transversely of the valve, and an axial sup
ply port in the shell, the‘plug having a passage
therein extending from the end adjacent the axial
supply port to an opening in the side of the plug
in the same plane as said'by-pass port and feed
ports, the plug also having a pair of transverse
grooves cut in the face thereof in the plane of
said opening and between which the opening is
disposed; the ports‘in the shell and the opening
and grooves in the plug being arranged so that
when the plug opening is in register with the
radial by-pass port, the feed ports will be closed,
and when the plug is rotated a predetermined dis
tance in one direction the plug opening will
register with one feed port and one groove will
establish communication between the other feed
port and by-pass port.
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