Improvements in or connected with Valves.
Year: 1892

page_text: Date of Application, 2nd Nov., 1892
Complete Specification Left, 2nd Aug., 1893-Accepted, 2nd 2ept., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Valves.
I, FRANK WALTER SCOTT, Junior, of the Firm of George Scott & Son,
of 44, Christian Street Commercial Road, in the County of London, Engineers, do
hereby declare the nature of this invention to be as follows:-
My invention relates to what are known as mitred working valves for use in
connection with cranes, lifts, presses and other machinery operated by hydraulic,
compressed air or other fluid pressure, and especially to valves of the kind
described in the Specification of former Letters Patent granted to me No. 14563
of 1891.
The chief object of my present invention is to arrange valve mechanism of the
kind described in the Specification of my said former Patent so that it may be used
in connection with machines having more than one pressure inlet or in connection
with more than one machine.
In carrying out my invention I provide a casing containing four valves proper
operated by two cams or levers contained in separate chambers or compartments
and each secured to a spindle projecting at one end through the casing and
provided with a stuffing box. The cam or lever spindles are adapted to be
moved simultaneously by means of a common lever, and are so arranged that
a pair of valves is operated simultaneously one for the inlet of the fluid pressure
and the other for the exhaust of the fluid introduced at the previous operation of
the valve.
The two inlet valves are in chambers communicating by a passage with a single
inlet to the casing and the two outlet valves are in chambers communicating by a
passage with a common outlet.
Instead of arranging the cam or lever for lifting the valves in the manner
described in the said former Specification I may arrange it to work in slots formed
in the stems of the valves in which case the cam or lever is in a chamber through
which the fluid passes on its way to the valves or I may arrange the cam to
pull the valves upwards in which case the cam is in a chamber in the upper
part of the valve casing which chamber communicates with the fluid so that it
remains constantly under pressure.
Dated this 2nd day of November 1892
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Valves.
I, FRANK WALTER SCOTT, Junior, of the Firm of George Scott & Son, of
44, Christian Street, Commercial Road, in the County of London, Engineers, 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 what are known as mitred working valves for use in
connection with cranes, lifts, presses and other machinery operated by hydraulic,

page_text: compressed air or other fluid pressure, and especially to valves of the kind
described in the Specification of former Letters Patent granted to me No. 14563
of 1891.
The chief object of my present invention is to provide a compound, arrangement
of valve mechanism of the kind described in the Specification of my said former
Patent so that it may be used in connection with machines having more than one
pressure inlet or in connection with more than one machine.
In the accompanying drawings,—
Figure 1 is a central vertical section of my improved working valve:
Figure 2 is a section on the line 2-2, Figure 1; and,
Figure 3 is a section on the line 3-3, Figures 1 and 2:
In carrying out my invention I provide a casing a having a horizontal partition b
and subdivided below this partition to form two chambers c, c' adapted to be con-
nected to the two pressure inlets of the machine or machines to be operated. In
chambers 6º above the partition bare seated two pairs of valves d, d, e, e¹; the
valves d, d¹ serving to control the entrance and escape of water into and from the
chamber c and the valves e, e¹ the entrance and escape of water into and from
the chamber c¹. The valves d, d' are adapted to be operated by means of a cam f
mounted upon a spindle g carried at one end in a bearing in the partition between
the chambers c, c¹ and at the other end in a bearing in a plug screwed into the
casing, the said plug as shewn in the drawings being provided with a stuffing-box j
and gland k for preventing leakage around the spindle g. The valves e, e¹ are
operated by a cam f¹ mounted on a shaft g in a similar manner to the cam f.
The projecting ends of the two shafts or spindles g, g are connected to a common
lever so that both of them and consequently both cams f,f¹ shall be moved
simultaneously.
m is the inlet for the pressure water and m¹ is the outlet for the exhaust water.
The chamber 6º containing the inlet valve d of one pair of valves communicates
through a passage n with the chamber 6° containing the inlet valve e of the other
pair of valves and the chambers 6º, 6º containing the exhaust valves d¹, e¹ of the
two pairs of valves also communicate through a passage n'.
With this arrangement it will be understood that when the lever is moved to
lift the valves e, di (that is the inlet valve of one pair and the exhaust valve of
another pair) the pressure water entering through the inlet m will pass through the
passage to the valve e, thence past the said valve into the chamber c¹ and thence
to the machine to be operated whilst at the same time the exhaust water from the
machine will flow into the chamber c and past the valve d¹ to the outlet m¹..
On
the lever being reversed the valves e, d' will close and the valves d, e¹ will be
opened, when the pressure water entering through the inlet m will flow past the
valve d into the chamber c and the water previously introduced will
from
escape
the chamber c¹ past the valve e¹ and thence flow through the passage n³ to the
outlet m',
The valves are normally retained upon their seats by springs o, o which are
placed under compression by means of caps p, p screwed into the casing over the
several valves.
In order to equilibrate the valves I provide the following arrangement, that is to
say, in each of the inlet valves d, e I form a central aperture 7 communicating with
the chamber 60 surrounding the body of the valve, the said aperture extending to
the top of the valve so that the pressure water can enter above the same; and
in the exhaust valves d', e¹ I form central openings ", " communicating with the
chambers c, c¹ below the valves, whereby, when the inlet valves d, e 'are open, the
pressure will act on the upper sides as well as on the undersides of the valves 'd', e¹
and so prevent their lifting until acted upon by the cams.
The exhaust valves d', e¹ are surrounded with cup-leathers s against which the
water acts to press them tightly against the said valves and so prevent the water
under pressure from escaping past these valves into the exhaust outlet m¹.

page_text: my
Having now particularly described and ascertained the nature of said
invention and in what manner the same is to be performed, I declare that what 1
claim is :-
:-
The improved compound valve mechanism constructed, arranged and operating
substantially in the manner and for the purposes hereinbefore described and
illustrated in the accompanying drawings.
Dated this 2nd day of An1902
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.