An Improvement in Hydraulic Valves.
Year: 1899

page_text: COMPLETE SPECIFICATION.
An Improvement in Hydraulic Valves.
I, JAMES ALFRED TOWLER, of 1, Cromer Road, Leeds, in the County of York,
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention relates to hydraulic valves such as are employed for admitting
liquid to each end of a hydraulic cylinder and allowing it to escape therefrom
after performing work.
The object which I have in view is such a construction and arrangement of
the valves that those for the two ends of the cylinder are in equilibrium in respect
of pressure, that they are easily moved and subject to very little wear upon
their beating surfaces, that their leather packings never pass over any perforated
surface and that they can readily be withdrawn for inspection or repairs.
The accompanying drawing is a longitudinal section of a valve according to
my invention, for one end of the cylinder, an equal and similar valve being
arranged for the other end, the same rod working both.
a is the inlet for the working fluid, b is the outlet or exhaust, c is the passage
to one end of the cylinder. d is a lining provided with a cup leather and having
through it lateral openings e to an annular space communicating with b.
This lining fits against a shoulder f where the joint is made tight by suitable
packing, and it is held in place by another lining g having lateral openings
communicating with a and held in position by the valve box cover h.
Within
the lining d is fitted the slide valve i which is pressed by a spring against a seat k
formed in the lining d. Within another lining works the valve rod m which
is provided with a cup leather and terminates in a spherical end n bearing against
the inner edge of the slide valve i. When the parts are in the position shewn in
the drawing, there is no communication with the cylinder; when n advances to the
right it pushes i off the seating and then farther advancing puts c in free
communication with b allowing fluid to escape from the cylinder. When n
retreats to the left the spring j causes i to move until it meets the seating k thus
closing passage to b, and as n continues to move to the left, there is free passage
for fluid from a through i and c to the cylinder.
As the rod m moves to and fro, it works also the similar valve for the other
end of the cylinder, so that fluid is admitted to the one end of the cylinder while it
is allowed to escape from the other, and conversely, and both valves, having equal
sectional areas, are under equilibrium in respect of pressure. Instead of the
rod m having a cup leather, as shewn, it may obviously work through a stuffing
By removing the cover h, all the parts of the valve can be taken out.
box.

page_text: Having now particularly described and ascertained the nature of this
invention, and in what manner the same is to be performed, I declare that what
I claim is: -
A hydraulic valve constructed and operating substantially as described with
reference to the accompanying drawing.
Dated this 26th day of January 1899
ABEL & IMRAY,
Agents for the Applicant.