Improvements in or appertaining to Slide Valves.
Year: 1894

page_text: Date of Application, 14th June, 1894
Complete Specification Left, 14th Mr., 1895-Accepted, 20th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Slide Valves.
I, JOHN EATOCK of Fern Cottage, Appley Bridge in the County of Lancaster,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object a method of and device for taking up the wear
on the supporting surfaces of slide valves. This is especially desirable in those
slide valves which have two working faces and are made wedge shaped as set forth
in my own Patent No. 188585. It is also desirable for curved surface slide
valves.
The invention consists in placing between the bottom of the slide valve, or even
of the valve rod, and the wearing surface ou which it reciprocates or turns, a
wedge shaped piece having a surface to fit both the cylinder or other wearing
surface on which the valve reciprocates, (which is made correspondingly oblique to
its axis for the purpose), and the valve itself. This wedge shaped piece has an
abutment at each end, bearing against an adjustable point or abutment. Each of
these points have their continuations in the form of pins or their equivalent passing
through the valve box to the outside by means of stuffing boxes or their equivalent.
These pins are either screwed through the glands, or have a nut in the stuffing
box, or are so arranged in other ways that they can have a longitudinal
adjustment.
The mode of action is as follows:-
The valve and this wedge piece on which it rests, having become somewhat
worn with the constant travel of the valve, or valve faces in a tapering valve
having become more worn than the bottom, and it being desirable to lower the
valve, the screws or other adjustments are adjusted from the outside until the
wedge shaped piece has been moved sufficiently one way or the other, to take up
the slack; this is done as often as is required.
It is obvious that even in a circular bearing, a circular wedge of this nature can
be used on the lower part to take up the wear, the bed of the wedge, and the
bottom of the wedge being slightly oblique to the wearing surface.
Dated the 13th day of June 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
I, JOHN EATOCK of Fern Cottage, Appley Bridge in the County of Lancaster,
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 :-
This invention has for its object a method of and device for taking up the wear
on the supporting surfaces of slide valves. This is especially desirable in those
slide valves which have two working faces and are made wedge shaped as set

page_text: forth in the Specification of my prior Patent No. 18858. It is also desirable for
flat and curved surface slide valves.
The invention consists in placing between the bottom of the slide valve or even
of the valve rod, and the wearing surface on which it reciprocates or turns, a
wedge shaped piece having a surface to fit both the cylinder or other wearing
surface on which the valve reciprocates (which is made correspondingly oblique to
its axis for the purpose) and the valve itself. This wedge shaped piece_has an
abutment at each end bearing against an adjustable point or abutment. Each of
these points have their continuations in the form of pins or their equivalent passing
through the valve box to the outside by means of stuffing boxes, or their
equivalent.
The accompanying drawing is a sectional elevation of a steam chest showing the
invention applied to a slido valve which has two working faces, of the kind set
forth in my prior Patent aforesaid. In this drawing, A is the slide valve, B the
valve spindle, C the steam supply inlet, D steam ports, F exhaust ports, G the
wedge shaped or taper piece placed between the bottom of the slide valve and
the wearing surface or bed H. Both the surface or bed H and the bottom of the
wedge are slightly oblique to the working surface of the valve. I are the
abutments at each end of the wedge G bearing against the pins J passing through
the steam chest to the outside by means of the stuffing boxes K. These pins are
either screwed through the glands or have a nut L in the stuffing box, or are so
arranged in other ways that they can have a longitudinal adjustment.
The mode of action is as follows:
-
The valve A and this wedge shaped piece G on which it rests and slides having
become worn with the constant travel of the valve, or the valve faces in a tapering
valve having become more worn than the bottom, and it being desirable to lower
the valve A, the pins J or their adjustments are adjusted from the outside until
this wedge shaped piece has been moved sufficiently one way or the other to take
up the slack. This is done as often as required. It is obvious that even in a
circular bearing a circular wedge of this nature can be used as the lower part to
take up the wear, the bed of the wedge and the bottom of the wedge being slightly
oblique to the working surface.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improvement in or appertaining to slide valves, which consists in inserting
between the bottom surface of the slide valve, or of the valve rod, and the
wearing surface or bed on which they reciprocate or turn, an adjustable wedge
shaped or taper piece such as G, this piece being so arranged that it can be
adjusted in either direction to take up the slack, caused by wear due to the constant
travel of the valves, substantially as described.
2. The use in combination with a slide valve, of an adjustable wedge or taper
piece at bottom, forming the supporting surface or bearing on which it works, and
means for locking the same in position, or sliding the same in either direction,
whereby wear can be taken up to any required extent, substantially as described.
3. The devices for taking up the wear on the supporting surfaces of slide valves,
taken as a whole substantially as set forth.
Dated this 13th day of March 1895..
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.