Improvements in Reducing Valves for Steam, Fluids, Compressed Air, and other Gases.
Year: 1896

page_text: Date of Application, 24th Jan., 1896
Complete Specification Left, 24th Oct., 1896-Accepted, 19th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in Reducing Valves for Steam, Fluids, Compressed
Air, and other Gases.
JOHN WALTER BOAZ, 2 First Avenue Manor Park in the County of Essex,
Engineer, THOMAS TRUSCOTT BOAZ, 57 Pigott Street Limehouse in the County of
London Engineer EDMUND ALFRED BOAZ 114 Stainsby Road Limehouse in the
County of London, Engineer do hereby declare the nature of this invention to be as
follows:-
Our invention relates to improvements in steam, fluid, compressed air, and other
gas reducing valves, and its object is to construct a reducing valve in which the
sensitiveness of action is greatly increased and friction greatly decreased.
Our invention consists in an arrangement of metal expansion chamber and valves
in such manner that the expansion chamber is internally connected to, and controls
two or more valves which allows the high pressure to pass through the valve box or
chamber at any desired lower pressure.
In one reducing valve constructed in accordance with our invention, we arrange
two metal valves (with ordinary faces and seats) one working in the centre of the
other and both opening against the high pressure.
At the top or low pressure end of the centre valve we construct a ball and socket
or universal joint which is connected to the top of expansion chamber internally by a
suitable rod.
"We regulate the desired reduction of pressure by means of a spring or springs
which are acted upon by ordinary nuts or the more preferable fly or wing nuts, and
indicate the reduction of pressure by a pressure gauge being fixed into the reduced
side of valve box or chamber in a suitable manner.
The action of this invention is as follows
When first the high pressure is turned on into the valve box or chamber and has
passed through the valves into the low pressure pipes or receptacle the valves remain
open until the reduced pressure is attained for which the springs are set, then the
action of the low pressure acting upon or extending the expansion chamber, the valves
are thus partially shut to the high pressure, only admitting the required amount of
pressure through.
When the reduced pressure is not being used and the high pressure is still turned
on, the valves shut entirely, not admitting the slightest amount of pressure to the
reduced side of the valve box or chamber.
Immediately upon starting to use the reduced pressure again the springs act upon
or collapse the expansion chamber, which being connected to the centre or small
valve of this device opens it and thus releases the larger valve and at the same time
allows the high pressure to escape through the valves and raise the reduced pressure
to its required height.
In another mode of arranging our new reducing valve, we arrange fibre, india-
rubber or suitable like material in a recess in the faces of either valves or seats so
that instead of two metal bodies coming together we get fibre, india-rubber or like
material, and metal forming the pressure tight joints which is more suitable for
reducing valves for reducing compressed or high pressure air and gases.

page_text: A characteristic feature of our invention consists in the operation of a large valve
by means of a small valve, this small valve only being allowed to move say one thirty-
second of one inch before it acts upon or opens the large valve, by which the
apparatus is made more sensitive and accurate in the reduction of pressures.
Another feature and advantage in our invention is the ball and socket or universal
joint at the end of rod which connects the expansion chamber and valves together,
which arrangement prevents any grip of the valves while working, by any side
pull of the connecting rod, thus it will roadily be seen the valves will find their
proper seatings.
Dated this 4th day of January 1896
JOHN WALTER BOAZ.
THOMAS TRUSCOTT BOAZ.
EDMUND ALFRED BOAZ.
Improvements in Reducing Valves for Steam, Fluids, Compressed
Air, and other Gases.
JOHN WALTER BOAZ 2 First Avenue, Manor Park in the County of Essex,
Engineer THOMAS TRUSCOTT BOAZ 339 Burdett Road, Limehonse late of 57 Pigott
Street Limehouse in the County of London Engineer EDMUND ALFRED BOAZ
114 Stainsby Road, Limehouse in the County of London 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 :-
Our invention relates to improvements in pressure reducing valves for steam,
water, other fluids, compressed air and other gases and has for its object the con-
struction of such valves so that friction is reduced to a minimum and more ready or
sensitive action obtained.
When a reducing valve is employed it is usual to have in connection with it,
another valve or cock for the purpose of shutting off the pressure, usually called
a stop valve or stop cock. In a valve constructed according to our invention, this
other valve or cock can be dispensed with, our valve combining a reducing valve
with a stop valve.
In this invention we employ a valve chamber having in connection with it a series
of metal expansion boxes forming an expansion chamber, which is connected
directly to the valve spindle. This chamber is operated upon from outside by one,
two or more springs so arranged that the necessary regulation of the pressure it is
desired to obtain can be effected by means of small thumb screws or fly nuts.
The valve spindle above mentioned is connected to a compound valve consisting
of two valves working one within the other, or if for very large valves it may be
found necessary to have three such valves.
It should be here mentioned that in this invention very light springs only are
necessary to obtain any desired pressure.
With reference to the accompanying drawings:-
.On Sheet 1. Figure 1 is a vertical section through the centre of a reducing valve
shewing the metal valves and ball and socket or "universal" joint in connection with
the valve spindle.
Figure 2 is a similar section shewing the expansion chamber and parts in elevation
with the valves in section such as are particularly applicable for use with compressed
air or fluids.
Figure 3 is a sectional plan of the valves on the centre line shewing the passages
for the steam, water, air or the like.

page_text: On Sheet 2. Figure 4 is a vertical section on centre line with parts in elevation,
shewing the arrangement of the valve for use as a reducing and stop valve combined.
The same letters apply to similar parts in all the drawings.
A is a small valve placed centrally within the large valve B. The valve A is.
attached directly to the valve spindle while the valve B is a floating valve working
upon the valve A.
C is the ball and socket or "universal" joint by means of which any side play
in the expansion chamber caused by careless adjustment of the springs FF is.
rendered inoperative with regard to the valves A and B.
D is the expansion chamber and is connected to the valve A by means of the
connecting rod or spindle E in which is formed the joint C.
This spindle E is connected to the chamber D by means of the conical joint J
and nut K a perfectly pressure tight joint thus being made.
FF are light springs which, when compressed by the fly nuts G
working upon
the screwed pillars or standards G fixed solidly to the valve body; operates upon
the expansion chamber D by means of the cross plate and spring casing H thus.
causing valve A to open.
Lis the high pressure side of the reducing valve and M is the low pressure
side. N is a cap nut having a non-adjustable spindle or distance piece formed
thereon by which the fall of the valves A and B is arrested when the require area
is obtained when valve is open.
O is an adjustable valve spindle with hand wheel working within a nut P which
is provided with a stuffing box, gland and gland nut so that there shall be no escape-
of pressure.
The manner of operation of this reducing valve is as follows:-
In a valve constructed as either Figure 1 or Figure 2 the pressure exerted.
upon the valve spindle by the springs causes the valve to remain open and in a
valve constructed as Figure 4, immediately the regulating spindle is screwed away
from the valves, the pressure of the springs then causes the valves to open.
When the steam or other pressure has passed from the high pressure side through.
the valves A and B into the low pressure side and expansion chamber. the pressure
in the low pressure side continues to rise untii the desired pressure is obtained.
Then the pressure within the expansion chamber, by causing the expansion chamber
to lengthen, begins to close the valves A and B, acting against the pressure.
exerted by the springs in proportion as the pressure rises.
If the pressure on the reduced side rises, however slightly, above that for which
the springs are set, the valves entirely close until the pressure has again fallen to.
normal, when the valves again open and allow more pressure to pass.
Having now described our invention and the manner in which it is carried out,.
we declare that what we claim is :-
1. The combination of a small inner valve with an outer or floating valve, forming.
a compound valve in the manner and for the purposes hereinbefore described.
2. The combination of an expansion chamber with a compound valve and a ball
and socket or "universal" joint, in the manner and for the purposes hereinbefore
described.
3. The combination with a reducing valve of an adjusting, regulating or setting
down spindle for entirely closing the valve.
4. The combination of a stop valve and reducing valve as and in the manner
bereinbefore described.
J. W. BOAZ..
T. T. BOAZ.
E. A. BOAZ..