IMPROVEMENTS IN SLUICE OR SUCH LIKE VALVES
Year: 1885

page_text: I, BENJAMIN GREEN MARTIN of 60 South Mall in the City of Cork Ireland
Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN
SLUICE OR SUCH LIKE VALVES and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
This invention consists of making the valve or moving part of two separate
wedge shape pieces having their inclined side surfaces brought together and their
ends so arranged with their bases reversed that the relative position of the outer
sides or surfaces and the figure formed by them is not altered by sliding one of
the pieces along the other for a short distance or fractional portion of its length,
the only effect produced on the outer surfaces by thus sliding one piece along the
other in one or the other direction being to increase or diminish the distance
between their outer faces for. when the thick ends or bases of the wedges are made
to approach one another the outer sides or faces recede from one another and when
the thin ends of them are moved towards one another the outer sides come closer
together consequently when two of these wedges are placed together they form a
valve which fits exactly the space between two seats when the two pieces are in
a certain position relatively and motion given to either causing its base or thick
end to move towards the base of the other while the other wedge shaped piece is
prevented from moving will cause the outer sides or valve faces to press against
their seats and vice versa if the base of one wedge piece be withdrawn from the
base or broad end of the other piece the outer sides or valve faces are relieved from
pressure against the seats and the valve slides across them without friction. The
power required to be exerted to open and shut a valve constructed on this principle
is very trifling whilst a tight closely fitting valve is secured.
I
The accompanying drawings illustrate the construction and details of this valve..
Figure 1 shews a section of the valve and Figures 2. 3. 4. 5. and 6 shew parts
separately.
:
A represents a section of the outer box or stationary part of the valve and has
the usual induction and eduction passages and also a projecting lateral chamber E
of square quadrilateral or other suitable form for its transverse section, and two
sides of which are or may be dressed up for the valve to slide upon whilst
being moved backwards or forwards across its seats for opening or shutting the
passages.
The surfaces a a of the centre of the box surrounding the inlet and outlet passages
are dressed to form the valve seats against which the outer sides of the wedge
shape pieces press when the valve is closed.
The movement of the valve across its seats for the purpose of opening and
shutting it is effected by the screw D which passes through a cover screwed into
the top of the chamber E and works in a nut C which nut fits loosely into recesses

page_text: in the inclined sides of the wedge shape pieces B B' The screw D has around its
neck F at H a collar which may be of a conical or spherical or other formation on
the outside and is fitted to work in a corresponding seat on the inside of the
cover G this collar is kept close to its seat by a set screw K screwed on the end of
the neck F and the head of this nut presses upon one side of the boss of the hand
wheel W while the other side of the boss bears and turns upon the top of the
cover G as shown in Figure 1. Or the collar H may be kept close to its seat and
the neck F passed through a stuffing box, and gland and have a nut I on a screw
on the outer end of it to bear on the boss of the hand wheel W instead of the
head of the set screw K as shown in figure 7. The hand wheel W for turning the
screw D is not keyed fast to the neck F but is slotted, so as to slide along it on a
feather sunk in For the hole in the boss of the hand wheel W and the part of the
neck F which passes through it may be made square so that the wheel W can
slide along the neck for a short distance but can not turn round without turning
the screw D along with it as shewn in Figure 8 and consequently the pressure
exerted on the boss of the wheel W by the set screw K or the nut I is transmitted
to the collar H and tends to force it to its seat on the inside of the cap G conse-
quently the screw D has no longitudinal "movement and is merely free to turn in
its nut C and in the opening in the cover G or the stuffing box through which it
passes. The effect being that when the hand wheel W is turned the screw D
screws into or out of the nut C according as the movement is to the right or the
left hand, and the nut C travels up or down along the screw D and being recessed
into the wedge shape pieces B' B it draws or pushes those pieces in the same direction
as it moves itself. Upon turning the screw D in the direction to draw it out of its
nut C the valve will move down across its seats until the projecting stop on the
wedge piece B reaches the bottom of the chamber E when it can go no further in
that direction but the wedge piece B¹ has freedom to pass still downwards and
consequently on continuing to turn the screw D in the same direction the wedge
piece B¹ slides on the wedge piece B and the bases are consequently brought closer
together and the outer sides or valve faces are forced wider apart and against
their seats.
Again when the screw D is turned in the opposite direction so as to screw into
its nut, the nut is drawn up and the wedge piece B' along with it, but as the top
of the nut does not come in contact with the top of the recess in wedge piece B
until after B¹ has been raised a little way, the piece B' again slides on the piece B
and the thin ends of the wedges approach one another and consequently the valve
faces are at liberty to move closer together under the pressure of the gas steam or
other fluid.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
In a valve the combination of two beveled or inclined parts B B¹ capable of
'sliding on each other, a socket piece C, an operating screw D with collar H and
adjusting screw K, handle W and a suitably formed valve chamber and seating
substantially
o deseribed
Dated this 8th day of June 1885.
W
BROOKES & SON,
55 & 56, Chancery Lane, London,
Agents for the said Benjamin Green Martin