close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2359017

код для вставки
Sgpt. 26, 1944.
H_ E. BALSIGER
2,359,017
RELIEF VALVE
Filed March 4, 1942
Inventor
HAROLD LBALSIQ E12
' (Ittorncg
2,359,017
Patented Sept, 26, 1944
UNITED STATES PATENT OFFICE
2,359,017
RELiEF vALvE
Harold E. Balsiger, Waynesboro, Pa., assignor to
Landis Tool Company, Waynesboro, Pa.
Application March 4, 1942, "Serial No. 433,369
2Claims.
This invention relates to relief valves for hy
draulic systems, particularly of the type which
compensate for change in viscosity such as that
shown and described in co-pending application
Serial No. 390,432, ?led April 25, 1941.
The function of a relief valve ‘is to prevent an
excess of pressure in a hydraulic system. Usually
(Cl. 137-53)
pressure at the other end thereof. The ?ow of
?uid thru passages l5 causes said valve to rotate
on its own axis. This movement provides a con
tinuous film of ?uid between the surface of the
valve and the housing so that the valve is in effect
?oating. The valve member is subjected to a
reciprocating movement due to variation in pres
an exces sof ?uid under pressure is supplied which
sure so that the passages l5 move back and forth
operation of the hydraulic system the require
valve H is ?oating on a him of ?uid there is a
across the edge of exhaust port l3 to vary the .
results in the relief valve being forced open to
permit the escape of such excess. During the 10 amount of ?uid escaping therethru. Because
considerable reduction in friction and therefore
said valve reacts to much smaller variations in
_ which escapes thru the relief valve also varies
pressure than its predecessors. Furthermore,
correspondingly. However, due to friction, in
ertia, etc., the movement of the valve usually 15 when said valve is rotating and ?oating, its posi
tion in the bore ‘is substantially concentric there
lags somewhat behind the change in pressure
,to
and clearance is small enough that leakage
and is not as sensitive as might be desired.
past the valve is reduced to a minimum.
In order to increase the sensitivity of this re
ments for ?uid vary and the amount ‘of fluid
lief valve, means have been provided for caus
I claim:
-’
i
1. In a hydraulic system, a pressure operated
ing said valve to rotate about its own axis dur 20
relief valve including a housing, a valve member
ing the time that the system is under pressure.
movable therein in response to variation in ?uid
This causes said valve to ?oat on the ?uid and
pressure in said housing, said housing having
thus respond to smaller changes in pressure.
?uid connections in communication with the op
Figure 1 is an enlarged sectional elevation of
a ?oating relief valve in the hydraulic system of 25 posite ends of the valve member for moving said
valve member in each of two opposite directions,
a grinding machine.
an exhaust port in said‘housing in communica
Figure 2 is a cross section on the line 2-4 of
tion
with said valve member, an end portion of
Figure 1.
e
In the drawing, numeral l0 indicates a valve
said valve member having a recess therein, pas
housing in which is slidably mounted a valve 30 sages from said recess to the outer surface of said
valve member at the edge of said exhaust port,
member ii, one end of which is larger than the
said passages and said valve member being con
other. The large end it controls the size of
structed and arranged to cause ?uid under pres
opening of an exhaust port l3. A shortaxial
sure passing thru said passages to rotate said
bore it in the large end of said valve is con
nected thru a series of tangential passages [5 35 valve member about its axis and ?oat in said
housing.
with the circumference thereof. Fluidv under
2. In a hydraulic system, a pressure operated
pressure passing thru said tangential passages
relief valve including a housing, a valve member
causes said valve to rotate.
.
movable therein in response to variation in ?uid
A ball valve 30 held against its seat 3| inside
valve it by spring 32 serves to release excess 40 pressure in said housing, said housing having
?uid connections in communication with the op
?uid in case said valve H fails to function prop-I
posite ends of the valve member for moving said
eriy.
'
""
valve member in each of two opposite directions,
Fluid under pressure from a pump 20 ?ows
an exhaust port in said housing in communica
thru line ‘H to the small-end of valve ll then
thru throttle valve 22 and passage 23 in said 45 tion with said valve member, an inlet port in said
housing spaced longitudinally from said exhaust
housing to the large end of said valve. Between
port, said valve member having a hollow portion
said throttle valve and the large end of said
in communication with said inlet port, passages
valve there is in said passage a port 25 to pas
from said hollow portion to the outer surface
sage 26 leading to a reversing valve 21 for a
driven mechanism, in this case a grinding wheel 50 of said valve member at the edge of said exhaust
port, said passages and said valve member being
support Eli.
‘
constructed and arranged to cause fluid under
As soon as'the system is placed under pres"
pressure passing thru said passages to rotate said
sure, ?uid acts to shift valve i I from left to right.
valve member about its axis and ?oat in said
This movement continues only icing‘ enough to
permit su?icient ?uid to escape thru tangential 55 housing.
HAROLD E.,BAI.SIGER.
passages iii to balance the valve against the pump
Документ
Категория
Без категории
Просмотров
0
Размер файла
238 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа