Improved Steam-actuated Valve for Engines and Pumps.
Year: 1890

page_text: Date of Application, 7th June, 1890
Complete Specification Left, 7th Apr., 1891-Accepted, 9th May, 1891
PROVISIONAL SPECIFICATION.
Improved Steam-actuated Valve for Engines and Pumps.
I, JOHN PITT BAYLY, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, (a communication to me from abroad by Benjamin Patten,
George Robertson and William Fraser, all of Yarmouth, Nova Scotia, Canada,
Gentlemen,) do hereby declare the nature of this invention to be as follows:-
This invention relates to a new and improved steam-actuated valve, more
especially applicable for steam pumps.
The valve consists of two pistons adapted to travel within the valve chest. These
two pistons are connected at a suitable distance apart by two arms, one of which
has a flat upper side which forms a valve seat. The steam chest is provided with
suitable inlet and exhaust ports, which are opened and closed by the pistons in
combination with an auxiliary slide valve which is secured to the valve rod, and is
adapted to slide upon the flat upper side of the connecting arm aforesaid.
The valve-rod passes freely and centrally through the two pistons and is
reciprocated in the usual manner. The outer ends of each of the two pistons are
recessed, and a second set of pistons carried upon the projecting ends of the valve-
rod, are adapted to slide in the recesses. The valve-rod is provided with channels
and diametrical apertures to form ports which admit steam into the recesses in the
pistons at the proper time.
When the valve rod is reciprocated, the auxiliary valve and second set of pistons
slide along with it, and the latter, coming (at the proper moment,) into contact with
the larger pistons move them forward, and rearward and open and close the steam
ports alternately,
000
J. P. BAYLY,
Applicant.
COMPLETE SPECIFICATION.
Improved Steam-actuated Valve for Engines and Pumps.
1, JOHN PITT BAYLY, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, do hereby declare the nature of this invention (a com-
munication to me from abroad by Benjamin Patten, George Robertson, and William
Fraser, all of Yarmouth, Nova Scotia, Canada, Gentlemen,) to be as follows:-
The invention relates to steam-engines and steam-pumps; and its object is to
provide a new and improved valve, which is simple and durable in construction and
very effective in operation.
The invention consists in certain parts and details, and combinations of the same,
as will be fully described hereinafter, and then pointed out in the claims.
Reference is to be had to the accompanying drawings forming a part of this
Specification, in which similar letters of reference indicate corresponding parts in
all the figures.
Figure 1 is a sectional side elevation of the improvement.
Fig. 2 is a transverse section of the same on the line of Fig. 1.
Fig. 3 is a like view of the same on the line y y of Fig. 1.
Fig. 4 is an under side view of the piston-valve, parts of the steam-chest being
in section; and
Fig. 5 is an under side view of the steam-chest.
The cylinder A, to which the improved valve is applied, is provided with the
usual piston B, held on the piston-rod C, connected with the machinery to be driven.

page_text: In the cylinder A. are formed the usual inlet-ports a and b, and the exhaust ports c,
and it also supports the steam-chest D, cylindrical in form and provided in its
bottom with the side ports a¹ and a², registering with the inlet-port a and also with
the side ports 1 and 2, registering with the inlet-port . A port c¹ extends
transversely in the bottoni of the steam-chest D between the ports a¹ a² and b¹ b²,
said port registering with the exhaust-port c in the cylinder A.
In the steam-chest D is held to travel a piston-valve E, provided with two
pistons E and E³, connected with each other by arms F and F, of which the former
is flattened on top to form a seat for the auxiliary slide-valve G, secured on a valve-
stem H, passing loosely through the centres of the pistons E and E², and through
suitable stuffing-boxes in one end of the steam-chest D. The valve-stem H is
operated by a suitable tappet or other connection from the piston-rod C. The
steam-inlet D in the steam-chest D opens into the interior of the steam-chest
between the two pistons E' aud E³, as is plainly shown in Fig. 1.
In the bottom of the steam-chest D are arranged the ports d and e, adapted to
connect the outer ends of the steam-chest D with the middle or steam compartment
of the said steam-chest. The inner ends of the portsd and e are adapted to register
with ports and g, formed in the arm F.of the steam-actuated valve E. In the
middle of the said arm I is formed a port h, over which and above the ports and g
operates the auxiliary slide-valve G, previously mentioned. The slide-valve is
adapted to alternately connect the ports and 9 with the port h, which latter is
adapted to connect with the port c', leading to the exhaust c. In the under side of
the arm F is formed a cavity i, adapted to register with the port c', leading to the
exhaust c, and also with the ports a' a³ and 12 alternately.
In the valve-stem H, near the pistons E' and E, are arranged the ports and k
adapted to connect the steam-space in the steam-chest D with cylindrical
recesses E3 and E', respectively, formed in the outer ends of the pistons E' and E².
In the recesses E³ and E are held two slide pistons I and 1', respectively, secured by
suitable means on the valve-stem H, and each provided on its outer end with
an annular flange I2, adapted to abut against the outer face of the respective
piston E or E2:
The operation is as follows: The live steam entering through the opening D
into the steam-chest D fills the space in the latter between the two pistons E¹
and E When the steam-actuated valve E is in the position shown in Fig. 1, live
steam passes through the port into the port d, and from the latter to the left-hand
end of the steam-chest D, so as to press against the outer face of the piston E', thus
holding the steam-actuated valve in the position shown. The live steam also enters
through the port a into the port a This forces the piston B into the position
shown. The exhaust steam in front of the piston B passes through the port 6 into
the ports and 2, (Fig. 5) and from the latter into the cavity i, formed in the
under side of the arm F. As the cavity i is connected with the port c', the exhaust
steam passes into the exhaust-port c, and from the latter to the outer air. When
the piston B is at the inner end of its stroke, the tappet on the piston-rod C
shifts the valve-stem H, so that the auxiliary slide-valve G is moved to the left and
closes the port to the live steam, while it opens the port g to the live steam
between the pistons E and E². The movement of the valve-stem I also moves
the piston against the live steam in the recess E, so that the steam-actuated
valve E is moved slightly to the left until the piston E2 opens the port e. The live
steam in the steam-chest D can now pass through the port g into the port e, and
from the latter to the right-hand end of the steam-chest D, thus pressing against
the said piston E2 and forcing the entire valve E to the left. The piston E¹ now
causes the steam in the left-hand end of the steam-chest D to exhaust through the
port into the port f, and from the latter through the cavity in the slide-valve G
into the port h, and from the latter the exhaust steam passes into the port e¹ and to
the exhaust e during the time that the valve E shifts to the left. When the valve E
shifts to the left, as previously described, the ports and 2 open into the steam
compartment of the steam-chest D, so that the live steam can pass through the

page_text: port and into the port b, and from the latter to the right-hand end of the
cylinder A, so as to force the piston B to the left, the exhaust steam in front of
the piston passes through the port a into the ports a¹ and a², and from the latter
through the cavity into the ports c¹ and c and to the outer air. When the
piston B arrives at the outer end of its stroke, the valve-stem H is again shifted,
and the above-described operation takes place in a manner similar to that previously
described.
It is understood that the pistons I and l' are steam-cushioned by live steam from
the steam-chest D, so that the movement of the said steam, the auxiliary valve G,
and the pistons I and I', as well as the steam-actuated valve E is very easy and
without noise. It will further be understood that the port h in the steam-actuated
valve E forms the exhaust-port for the auxiliary slide-valve G, and in travelling to
the exhaust port c¹ passes over the bridges between the ports a' and b', so as to cut
off the exhaust steam from the recesses and E' of the valve E, thereby entrapping
some of the exhaust steam at the respective end as well as preventing the live
steam admitted through the ports jor k from passing out through the ports d or e,
respectively, thence to the ports for g, respectively, and port h to the outer air. It
will also further be seen that the entire valve is very simple in construction, and
can be easily repaired when worn out.
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. In a valve, the combination, with a steam-chest provided with ports, of a
steam-actuated piston-valve held to travel in the said steam-chest and provided with
two pistons connected with each other by arms, of which one has a flat upper side
which forms a valve-seat, a flat auxiliary slide-valve held on the said valve-seat of
one of the said arms, and a valve-stem to which the auxiliary valve is attached and
operated from the cylinder piston, substantially as shown and described.
2. In a valve, the combination, with a steam-chest provided with ports a' b¹ c¹ at
its central port and the opposite ports de leading to its ends, of two pistons held to
slide in the said steam-chest over the said ports, an arm connecting the said pistons
with each other and forming a valve-seat, which valve-seat is provided with the
ports ih, operating over ports a b₁ c¹, and the ports fg, operating in connection
with ports de, and an auxiliary slide valve held to travel on the said valve-seat,
substantially as shown and described.
3. In a valve, the combination, with a steam-chest provided with ports, of two
pistons held to slide in the said steam-chest over the said ports, an arm connecting
the said pistons with each other and forming a valve-seat, an auxiliary slide-valve
held to travel on the said valve-seat, and a valve-stem carrying the said slide-valve
and provided with separate and independent ports jk beyond the ends of the
auxiliary valve, substantially as shown and described.
4. In a valve, the combination, with a steam-chest provided with ports, of two
pistons held to slide in the said steam-chest over the said ports, an arm connecting
the said pistons with each other and forming a valve-seat, a slide-valve held to
travel on the said valve-seat, a valve-stem carrying the said slide-valve, and
provided with ports, and a second set of pistons secured on the said valve-stem and
adapted to slide in the ends of the said first-named pistons, substantially as shown
and described.
5. In a valve, the combination, with a steam-actuated valve, provided with two
pistons connected with each other, of a valve-stem passing loosely through the said
pistons and provided with ports, and a second set of pistons secured on the said
valve-stem and adapted to slide in the said first-named pistons, substantially as
shown and described.
6. A steam-actuated valve comprising two pistons, and arms connecting the
pistons with each other, one of which forms a valve-seat and is provided with
ports j'y and hi substantially as shown and described.

page_text: 7. A steam-actuated valve comprising two pistons, and arms connecting the
pistons with each other, one of which forms a valve-seat and is provided with
ports fg and i, and an auxiliary slide-valve held to slide on the said valve-seat,
over its ports, substantially as shown and described.
Dated this 7th day of April 1891
J. P. BAYLY,
Applicant.