aprovements in and relating to Valves for Air and like Compressors.
Year: 1899

page_text: lination 9th Dec., 1899-Accepted, sist mar.,
plication 9th Dec., 1899-Accepted, 1st mar
COMPLETE SPECIFICATION.
mmunicated from abroad by THE INGERSOLL SERJEANT DRILL COMPANY, a
Corporation organized under the laws of the State of West Virginia, and
having its principal business office at No. 26, Cortlandt Street, in the City
of New York, in the State of New York, United States of America, Manu-
facturers.]
aprovements in and relating to Valves for Air and like Compressors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
5, Southampton Buildings, in the County of Middlesex, do hereby declare the
ature of this invention and in what manner the same is to be performed, to be
articularly described and ascertained in and by the following statement:-
1
This invention relates to means for operating the valves of compressors for
ir and other gaseous or aeriform bodies.
According to this invention the inlet valves and discharge valves have their
closing movements effected in a positive manner, and so quickly that they are
allowed to remain wide open until the piston has arrived within an extremely
short distance from the end of its stroke.
I will first describe with reference to the accompanying drawings as much of a
horizontal compressor as is necessary to illustrate the invention and will after-
wards point out the novelty in claims.
Figure 1 of said drawings represents a side elevation.
Figure 2 a face view of the back cylinder head on a larger scale than Figure 1.
Figure 3 a section of the said cylinder head on the line 3-3, of Figure 2.
Figure 4a horizontal sectional view of a valve which will be hereinafter
explained.
Similar letters of reference designate coresponding parts in all the figures.
a designates the compressor cylinder having in each of its heads bc the inlet
and discharge valves and d of which there may be one or more of each, two
of each being shown. (Figure 3). The inlet valves are in the upper part of the
cylinder and the discharge valves in the lower part thereof as shown. The said
being of a well known puppet kind closing into seats e
valves are all shown as
25 and fitted with tubular guides f. They and their seats are represented as
arranged, as is common, in separate inlet boxes g and discharge boxes h formed
within the cylinder heads and communicating respectively through passages i, j
along the sides of the cylinder a with the inlet pipe 25 and discharge pipe 26 of
the compressor.
30
flui
For each of the inlet valves there is attached to its respective cylinde
head or c outside of its respective box 9, the cylinder k of a
pressure motor the purpose of which is only that of closing the valve. Thi
cylinder is independent of, or has no direct communication with the compresso
cylinder . For each of the discharge valves d there is a similar cylinder
35 These motor cylinders severally contain pistons m connected with the stems n
their respective valves, the said stems passing through stuffing boxes o, p, on t
valve boxes g, h, and motor cylinders respectively. The cylinders kla
lied with compressed air or gas for operating on their pistons to close t

page_text: valves from any suitable source, as for example the receiver into which the
compressor delivers, through a pipe q (see Figures 1 and 4) under the control of
an induction and eduction valve r in a chest s whose ports, 6, communicate
respectively through pipes tu and branches 8, 9, 10, 11, 12, 13 with the said
cylinders and from whose port 14 an exhaust pipe 15 leads to the atmosphere.
The branches 8, 9 of the pipet and those 10, 11 of the pipe u, lead toward opposite
ends of the cylinder a. The branch 8 of the pipe has two sub-branches 12 which
lead as shown in Figures 1, 2 and 3, to the inner ends of the cylinders k of the
inlet valves of the back cylinder head 6 and the branch 10 of the pipe u has
sub-branches 13 which lead to the outer ends of the cylinders of the discharge
valves of the same head. The other branches 9, 11 of the pipes tu have
communication by sub-branches (not shown) with the cylinders of the valves in
the front cylinder head c in a manner precisely the reverse of what has just been
described with reference to the back cylinder head b, that is to say, the branch
pipe 9 has sub-branches leading to the outer ends of the cylinders of the
discharge valves of the front head c and the branch pipe 11 has sub-branches
leading to the inner ends of the cylinders k of the inlet valves of said head c.
The several sub-branches above described from the branch pipes 9, 11, though not
shown, may be well understood by reference to Figures 2 and 3 when it is stated
that the sub-branches of the pipe 11 are like the sub-branches 12 of the pipe 8
and the sub-branches of the pipe 9 are like those 13 of the pipe 10.
The induction and eduction valve for controlling the induction and eduction
of the compressed air or gas to and from the valve cylinders kl for closing the
valves may be of any suitable kind. The valve r (Figure 4) herein represented
for the purpose, is an ordinary three-port D slide valve. The motion, necessary to
be imparted to said valve just before the completion of the stroke of the com-
pressor piston may be imparted through any suitable connection with said piston
or the engine which drives the compressor so as to be controlled by such engine,
but is represented (see Figure 1) as imparted through a levere which works on a
fixed fulcrum 16 and is connected by a rod 17 with the cross-head y of the
compressor piston rod, the said lever acting alternately on tappets 18, 19, on
a rod 20 connected with the stem 21 of said valve r.
Before explaining the operation of this controlling valve and the closing
pistons m of the inlet and discharge valves v d, I will first mention that the
opening of the said valves may take place automatically as the piston moves.in
either direction, as is common to puppet valves in air compressors. The closing
operations, effected according to my invention, take place as follows: I will
first suppose the compressor piston to have very nearly completed its stroke
towards the front head c of its cylinder, the lever by its connection with said
piston strikes the tappet 19 and moves the valve r in the same direction, opening
the port 6, quickly effecting the induction of the compressed air or gas through
the pipe t and its branches 8 and sub-branches 12 to the cylinders k of the inlet,
valves v., in the back head band at the same time effecting a corresponding
induction through the same pipe and its branch 9 and sub-branches to the
cylinders of the discharge valves of the front head c. The simultaneous induc-
tions of air or gas to the respective cylinders k and cause the pistons of the inlet
valves in the back head b and the discharge valves in the front head c to so move
as to instantaneously close their respective valves. In like manner as the com-
pressor piston is completing its stroke towards the back head, the lever moves
the valve in the same direction, and the port 7 is opened to effect the induction
of the compressed air or gas to the cylinders k of the inlet valves of the front
cylinder head, and the cylinders of the discharge valves d in the back cylinder
head; the compressed air is thus caused to instantaneously close all of those
valves. The movement of the valve r in one direction to effect the induction of
the compressed air to one set of cylinders kl also effects the eduction through their t
same pipes and branches from the other set of cylinders, and so permits the free
opening of the valves by the pressure in the cylinder or inlet boxes g.

page_text: Να
rovements in and relating to Val
and discharge valves positively operated accord
escribed may be kept wide open during about nine.
de compressor piston. They may be caused to close earlier or
by having the tappets 18, 19, adjustable on the rod and setting
rer together or further apart.
vent the slamming of the valves vd in closing I provide them in any
manner with dash pots. In the example of the invention represented,
ash pots 22 are formed in the valve operating cylinders themselves,
or the inlet valves v being between their pistons m and the outer ends of
cylinders and those for the discharge valves d being between their
as m and the inner ends of their cylinders . These dash pots are provided
pet cocks 23 which are open to the atmosphere and which communicate with
oves 24 formed around the interiors of those portions of the cylinders which
involved in the dash pots. The pistons passing these grooves in their move-
ents for closing the valves, close the communication with the atmosphere, and
he air thus confined forms the cushion of the dash pots. The action of these
lash pots may be adjusted by giving more or less opening to the pet cocks 23.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondents, I declare that what I claim is:
1. In an air compressor, the combination of a discharge valve and an inlet
valve at the same end of the compression cylinder, fluid pressure motors one for
each of said valves, and an induction and eduction valve which is common to
both of said motors and is controlled by the engine which drives the compressor
25 for admitting fluid pressure to the discharge valve motor for closing said valve and
at the same time exhausting it from the inlet valve motor to permit the free
opening of the latter valve, substantially as herein described.
2. In an air compressor, the combination of an inlet valve and a discharge
valve at the same end of the compression cylinder, fluid pressure motors one
30 for each of said valves, and an induction and eduction valve which is common to
both of said motors and is controlled by the engine which drives the compressor
for admitting fluid pressure to the inlet valve motor for closing said valve and at
the same time exhausting it from the outlet valve motor to permit the free
opening of the latter valve, substantially as herein described.
35
3. In a double-acting air compressor having an inlet valve and a discharg
valve at each end of its compression cylinder, the combination with such sever
valves, of fluid pressure motors for closing them, one of such motors for ea
of said valves, and a valve which is common to all of the said motors and
controlled by the engine which drives the compressor for admitting fluid pres
40 to the discharge valve motor at one end of the cylinder and exhausting it
the inlet valve motor at the same end and at the same time admitting
essure to the inlet valve motor and exhausting it from the discharge valve
ther end of said cylinder substantially as herein described.
day of December 1899.
HASELTINE, LAKE & Co.,
Southampton Buildings, London
ents for the Applicant.
&Co., L