Improvements in Reversing Valves or Cocks for Fluid Motors or like uses.
Year: 1897

page_text: Date of Application, 1st Mar., 1897-Accepted, 5th June, 1897
COMPLETE SPECIFICATION.
Improvements in Reversing Valves or Cocks for Fluid Motors
or like uses.
I WILLIAM EDGAR PLUMMER, of Soho Works, Thornton Road, Bradford in tho
County of York, Managing Director 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 relates to what is commonly known as a plug cock or valve for
fluid motors or like uses which cock is so arranged as to give perfect and instant
control of the fluid entering and leaving any motor, and is specially designed so that
the direction in which the fluid may be passing can be instantly changed and the
motion of the motor consequently reversed or entirely stopped as may be desired.
The manner in which this is accomplished will be seen on reference to the
accompanying sheet of drawings, whereon similar letters refer to the same or similar
parts.
Figure 1, is a plan showing one arrangement of the reversing cock. *
Figure 2, is a front elevation of the same arrangement, and
Figure 3, is a side elevation of the same arrangement.
Figure 4, is a longitudinal section through the plug of the cock on the line B-B,
on Figure 2.
Figure 5, is a cross section of the same plug with part of the shell of cock, and is
taken on the line A A, on Figure 1.
The cock consists mainly of a shell or barrel F and a plug G. The shell or barrel
is fitted with three branches E K and L.
The branch E is attached to the pipe bringing the fluid for actuating the motor,
and this branch opens into the interior of the shell or barrel F, which barrel is
accurately prepared to receive the taper plug G.
This plug G is arranged to present two separate and distinct passages or
ports H and J for the flow of the fluid. One port H which may be nearly semi-
circular in section, as shown, is made upon the taper surface of the plug and at right
angles to the axis of same.
The other port J starts from the taper surface of the plug, and on the same.
circumferential line as the port.H, but passes downwards through the centre of the
plug and right out through the narrow end of same. In the arrangement now
shown the fluid entering by the supply branch E is conveyed by the port H to the
branch K and thence passes along the arm D direct to the motor, the said arm being
in communication with same. The exhaust from the motor passes through the arm C
and thence through the branch L to the plug of the valve, and the port J being then.
directly opposite the opening in branch L the fluid passes through this port exhausting
to the atmosphere direct from the end of the plug, or through a suitable connection
which may be added to same. If the plug be turned through an angle of about
120 degrees, the port H will then convey the fluid from the admission branch E to the
branch L and so through the arm C, direct to the motor, the exhaust from the latter
passing through the arm D and branch K to the port J which will then be directly
opposite the opening in branch K, thus permitting the exhaust fluid to have free exit.
This action would entirely reverse the direction of the fluids, and of the motors
working in connection therewith. In order that the reversing action may be readily
accomplished, a handle M is fitted to one end of the plug, to which it may be attached
Pin37

page_text: in any convenient manner, and secured by nut or other well known device to keep
the plug tight in its seat and prevent the handle coming off.
In the drawings the handle M is screwed on to the plug and is kept in position
by the combined lock nut and bend N as shewn. To secure a guide in operating
the valve, the plug is fitted at its broad end with a fixed pin O which permits the
valve to be rotated through the required angle necessary to accomplish the reversal
or the stoppage of the flow, the shell of the valve being recessed or cut for the length
of travel of this pin, so as to prevent rotation beyond the desired points. A small
spring pin is provided at one point, and if it is desired to stop the machine
altogether the indicating pin O must be forcibly turned beyond the spring pin, which
is so shaped at the end as to permit the passage of the pin O when the valve handle
is smartly turned.
It will be seen that when the cock is in use the fluid supply is passing along the
port H of the plug and the fluid exhaust is passing through port J of the plug at
one and the same time.
·
The shape and direction of the branches E, K, L and arms C and D may
be altered to suit any special requirements and it must be understood that I do not
confine myself to the exact details shown in the drawings which may be modified
without altering the principle of the invention.
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 :-
In a reversing valve or plug cock for a fluid motor, or for like use, the combination
and arrangement of the several branches, ports and parts for the purpose of governing
the flow of fluids, substantially as herein shown and described.
Dated the 1st day of March 1907
་
WM. BROOKES & SON,
55 & 56 Chancery Lane, London, Agents for the Applicant.