Improvements in Fluid Pressure Reducing Valves.
Year: 1898

page_text: Improvements in Fluid Pressure Reducing Valves.
I, WILLIAM HAMILTON MARTIN, of 110, Dokkade, Flushing, Holland, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention has reference to valves for automatically reducing to any desired
extent the pressure of fluid as it passes from the inlet to the outlet of the valve.
With steam pressure reducing valves as at present constructed a considerable
amount of steam escapes from the inlet to the outlet of the valve. Now one object of
the present invention is to so construct such valves that the passage therethrough
will, when required, be closed in a practically fluid-tight manner.
The accompanying drawings illustrate by way of example a construction of reducing
valve according to this invention:
Fig. 1 is an elevation;
Fig. 2 a section on the line a-a Fig. 1; and
Fig. 3 shows in section on the line bb Fig. 1, the upper portion of the valve.
1 is the valve casing with inlet and outlet 1b and having a faced valve seat
at 1. The valve proper 2 is of flat rectangular shape with a rectangular opening
through it; it is arranged to slide between the faced valve seat 1 and a suitable
frame 3 for relieving the pressure, the said frame being formed with projecting sides
or edges 3 that rest on the valve seat and also, at that side of it which is adjacent
to tlie valve 2, with a recess 3b of similar shape to the port in the valve seat. The
4 is a curved link attached at
frame 3 is pressed against the seat by a spring 3º.
one end to the valve 2 on the reduced pressure side, and the other end of which is
connected with an enlarged spindle or plunger 5 that extends from the outlet side of
the valve through a stuffing box 6 to the atmosphere This spindle or plunger is
coupled directly, or by a suitable lever 7, to springs 8 arranged outside of and adjust-
ably attached to the valve casing. In the example, the ends of the springs are
attached to cross beams or yokes 9, 9ª connected respectively to the lever 7 and a
screw spindle 10 passing through a hole in an arm 11 of the valve casing and fitted
with a nut or hand wheel 12 by means of which the tension on the springs which
keeps the unbalanced pressure on the enlarged spindle in equilibrium, can be
-varied.
f
Since the spindle or plunger 5, which is directly connected to the valve 2, extends
from the outlet or reduced pressure side of the valve, any variation in this pressure
will tend to open or shut the passage through the valve according as the pressure
falls below or rises above the normal pressure for which the springs have been adjusted.
• Reducing valves with balanced slide valves as above described, may be variously
modified, for example, instead of an enlarged spindle or plunger and stuffing box, a
cylinder and piston may be employed, one end of the cylinder being open to the

page_text: reduced or low pressure side of the valve and the other end open to the atmosphere,
or connected by a pipe to a surface condenser or other reservoir in which an approxi-
mately uniform pressure is maintained.
I, WILLIAM HAMILTON MARTIN, of 110, Dokkade, Flushing, Holland, 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 reference to valves for automatically reducing to any desired
extent the pressure of fluid as it passes from the inlet to the outlet of the
valve..
With steam pressure reducing valves as at present constructed a considerable
amount of steam escapes at all times from the inlet.to the outlet of the valve. Now
one object of the present invention is to so construct such valves that the passage
therethrough will, when required, be closed in a practically fluid-tight manner.
Referring to the drawings left with my Provisional Specification Fig. 1 is an
elevation of a construction of reducing valve according to this invention;
Fig. 2 a section on the line a a Fig. 1; and
Fig. 3 shows in section on the line bb, Fig. 1, the upper portion of the
valve.
1 is the valve casing with inlet 1. and outlet 1b and having a faced valve seat 1°.
The valve proper 2 is of flat rectangular shape with a rectangular port or opening
through it; it is arranged to slide between the faced valve seat 1 and a suitable
frame or plate 3 for relieving the pressure, the said frame being formed with projecting
sides or edges 3ª that abut against the valve seat, and also, at that side of it which is
adjacent to the valve 2, with a recess 3b of similar shape to the port in the valve seat.
The frame 3 is pressed against the seat by a spring 3°. 4 is a curved link attached
at one end to the valve 2 on the outlet or reduced pressure side, and the other end of
which is connected with an enlarged spindle or plunger 5 that extends from the outlet
side of the valve through a stuffing box 6 to the atmosphere. It is preferable to form
the spindle or plunger 5 of very hard and incorrodible metal such as a nickel steel
alloy consisting of say about 75% of steel and 25% of nickel, as it is found in practice
that if the plungers are formed of ordinary iron or steel they soon become corroded,
and if formed of gun metal will not stand the wear for any considerable length of
time. The spindle or plunger 5 is coupled directly, or by a suitable hand-lever 7, to
springs 8 arranged outside of and adjustably attached to the valve casing.
example, the ends of the springs are attached, to cross heads or yokes 9, 9 connected
respectively to the lever 7 and a screw spindle 10 passing through a hole in an arm,ll
attached to the valve casing and fitted with a nut or hand wheel 12 by means of
which the tension on the springs can be varied...
In the
Since the spindle or plunger 5, which is directly connected to the valve 2, extends
from the outlet or reduced pressure side of the valve, any variation in this pressure
will tend to cause the opening or shutting of the passage through the valve accord-
ing as the pressure falls below. or rises above the normal pressure for which the
springs have been adjusted... The recess 3h enables steam to pass, when the valve, is

page_text: open, through the port or opening in the slide valve 2 as well as past both ends of
the said valve, thereby giving a large area of opening with a small inmovement of the
valve.
Reducing valves with balanced slide valves as above described, may be variously
modified, for example, instead of an enlarged spindle or plunger and stuffing box, a
cylinder and piston may be employed, one end of the cylinder being open to the
reduced or low pressure side of the valve and the other end open to the atmosphere,
or connected by a pipe to a surface condenser or other reservoir in which an
approximately uniform pressure is maintained.
Valves such as herein before described and illustrated will not be liable to become
jammed in the event of grit or the like getting between the working faces, as is the
case with cylindrical valves and unbalanced valves.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be perforined, I declare that what I
claim is:-
1. A fluid pressure reducing valve comprising a casing formed with an inlet and an
outlet and a slide valve having a port or opening therethrough and being arranged
to slide between a valve seat formed around an opening between the said inlet and
outlet and a pressure relieving frame or plate having at that side which is adjacent
to the valve a recess of similar shape to the opening in the valve seat, the movement
of the slide valve being controlled by a loaded plunger or the like which is subjected
to the pressure in the outlet of the valve casing, substantially as described.
2. A fluid pressure reducing valve having a flat balanced slide-valve, constructed,
arranged and operating substantially as described with reference to and shown in the
drawings.