Improvements in Reducing-valves.
Year: 1890

page_text: Date of Application, 5th Apr., 1890
Complete Specification Left, 2nd Jan., 1891-Accepted, 7th Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Reducing-valves.
1, JOHN KIRKALDY of 40 West India Dock Road, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention to be as follows:
:-
The object of the invention is to provide a valve by which steam or other fluid
may be drawn off from a supply pipe under high pressure and the drawn off steam
or fluid always maintained under one uniform pressure whatever may be the
pressure in the supply pipe.
construct the reducing valve in the manner shewn in the drawing annexed.
In the drawing A is the inlet for steam and B the outlet, C is a disc valve
closing the passage from one to the other. D is the valve stem which is prolonged
upwards and has upon it a piston E fitting within a cylinder F which is of the same
diameter as the opening through the valve seat. The pressure of steam upon the
top of the valve is therefore balanced by the pressure of steam on the bottom of
the piston. The stem D is prolonged above the piston and made to pass out
through the top of the cylinder F. Outside the stuffing box it has a disc G fixed
upon it against which a coiled spring H is made to bear. The upper end of the
spring rests against a bar I which is held fast at a distance from the top of the
cylinder by two rods J-these rods are at one end secured to a flange around
the top of the cylinder and at the other are made to pass through holes in the bar
and have screw threads cut upon them on to which are screwed nuts K and by
these nuts the bar is locked to the rods.
By screwing the nuts along the rods the bar can be fixed at any desired distance
from the cylinder and so any desired pressure can be put upon the spring.
The valve C is held open by the action of the spring and stean or other fluid
under pressure passes from the inlet to the outlet until the pressure in the outlet
is sufficient to overcome the downward thrust of the spring and to press the
valve upwards and close it.
Dated this 5th day of Anril 1800
COMPLETE SPECIFICATION.
Improvements in Reducing-valves.
I, JOHN KIRKALDY, of 40 West India Dock Road, in the County of Middlesex,
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 :-
The object of the invention is to provide a valve by which steam or other fluid
may be drawn off from a supply pipe under high pressure and the drawn off steam
or fluid always maintained under one uniform pressure whatever may be the
pressure in the supply pipe.
I construct the reducing valve in the manner shewn in the drawing annexed.
In the drawing left with the Provisional Specification A is the inlet for steam
and B the outlet, C is a disc valve closing the passage from one to the other.
D is the valve stem which is prolonged upwards and has upon it a piston E fitting
within a cylinder F which is of the same diameter as the opening through the
valve seat. The pressure of steam upon the top of the valve is therefore balanced
by the pressure of steam on the bottom of the piston. The stem D is prolonged
above the piston and made to pass out loosely through the top of the cylinder F

page_text: so that the space above the piston is always at atmospheric pressure and so that a
key may be applied to the upper end of the stem and the valve turned on its seat
whenever desired so as to ensure its being in good working order. Outside the
stuffing box it has a disc G fixed upon it against which a coiled spring H is made
to bear. The upper end of the spring rests against a bar I which is held fast at a
distance from the top of the cylinder by two rods J-these rods are at one end
secured to a flange around the top of the cylinder and at the other are made to pass
through holes in the bar and have screw threads cut upon them on to which are
screwed nuts K and by these nuts the bar is locked to the rods.
By screwing the mits along the rods the bar can be fixed at any desired distance
from the cylinder and so any desired pressure can be put upon the spring.
The valve C is held open by the action of the spring and steam or other fluid
under pressure passes from the inlet to the outlet until the pressure in the
outlet is sufficient to overcome the downward thrust of the spring and to press the
valve upwards and close it.
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: :-
1. The reducing valve with the valve stem projecting out from the outer end of
the cylinder in which the piston on the valve stem works and acted upon by a
coiled spring on the outside which at one end bears against a collar on the stem
and at the other end against a bar which by nuts and bolts can be set nearer to
or further from the end of the cylinder to adjust the compression of the spring.
2. The reducing valve constructed substantially as herein before described and
illustrated in the drawing annexed.
Dated this 23rd day of December 1890.
JNO. KIRKALDY.