Improvements in Valves.
Year: 1896

page_text: Date of Application, 17th Dec., 1896-Accepted, 17th Apr., 1897
COMPLETE SPECIFICATION.
Improvements in Valves.
I, WILLIAM GEARY PRESCOTT residing at Findlay, in the County of
Hancock, State of Ohio, U.S.A. Gentleman, 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:-
My invention has relation to improvements in valves, especially adapted for
connection to and use in oil tanks; and the object is to provide an automatically
seating valve intended for interposition in the discharge pipe of the tank, and adjacent
thereto, whereby when the oil is drawn down in the tank to the lowest level, the
valve will close the pipe and prevent the ingress of air to the tank to interfere with
the subsequent rise of oil in the tank.
I have fully and clearly illustrated my invention in the accompanying drawings,
wherein,
Figure 1 is a vertical sectional view of the valve, the valve casing and
connections; and
Figure 2 is a similar view with the valve open.
A designates the valve casing, tapering inwardly from top to base, substantially
as shown, and formed with an interior annular valve seat 2, on which the float
valve seats. The body of the casing A is formed with an elbow 3, to make
connection with the inlet pipe from the oil tank, and also formed with an outlet or
discharge connection 5, opening from the side of the casing A, the lower line of
this, pipe connection 5 being substantially on a line with the upper line of the inlet
elbow.
B desiguates the float valve, made of any suitable material, and consisting of a
hollow tapering or conical shell with closed top and bottom, and adapted to fit in
the tapering casing A and rest on the valve seat 2, and close the port to the
discharge pipe, when the oil is drawn down in the tank to the gravity line, and to
be floated by the oil when flowing through the shell.
A threaded rod 7 is let through the casing, and provided with a disk 8, as shown
in the drawings.
On the top of the casing A is fitted a screw cap C, which closes the casing and
prevents the escape of oil when the valve is raised and the oil is passing through
the casing. This cap C is provided with a screw threaded rod 9, to the lower end
of which is secured a disk 10, and the upper end of said rod 9 projects through the
cap C, and it is formed with an arm 12, by means of which the disk 10 may be
screwed down on top of the float valve to close it, and when so closed, the cuter
end of said arm, which is provided with an orifice 13, comes in line with a similar
orifice in the strap 14. As shown in Fig. 1, the parts may be locked to prevent
the unauthorized opening of the valve. The strap is hinged to the casing A, as
shown.
15 is a small pet cock in the cap C to relieve the pressure from the top of the
valve to allow it to rise bodily.
To lift the float valve from its seat in the casing, the lock 16 is first removed,
and the disk 10 raised to the position shown in Fig. 2. By screwing up the rod 7
against the bottom of the valve, the valve may be raised from its seat, when
the force of the oil will carry it further upward, where it will remain until the
oil-pressure is overcome by its weight, when it will again drop down onto the
seat.
.

page_text: After the valve has been lifted as specified, the threaded rod is screwed back to
normal position, being substantially that shown in Fig. 1.
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. A valve for stopping the ingress of air to an oil-tank, comprising a tapering
casing formed with an inlet pipe, and an interior annular flange at its base, a
discharge pipe opening adjacent to the base of the valve casing, a tapering float
valve in the casing adapted to move down therein by gravity and close the outlet
port in the stem, and a cover detachably secured on the stem, substantially as
described.
2. A valve for stopping the ingress of air to an oil tank, comprising a casing
formed with an inlet pipe, and an interior annular flange at its base, and a
discharge pipe leading from the base thereof, a tapering float valve in the casing,
adapted to move down therein by gravity and close the outlet port in the casing, a
vertically adjustable screw let through the bottom of the shell, and having a disk
on its upper end to raise the valve from its seat, and a cover secured on the tapering
stem, substantially as and for the purpose specified.
3. A valve comprising a conical casing formed with an inlet and an outlet
connection, an interior annular flange or valve seat, and provided with a screw
threaded rod located in the base of the casing and having its upper end provided
with a disk, a conical float valve located in the casing, and a removable screw cap
provided with a pet cock and a screw threaded rod having a disk secured to its
lower end, and an operating arm secured to its upper end and adapted to be
detachably secured to a hinged. strap on the casing, substantially as and for the
purpose set forth.
Dated this 17th day of December 1896.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.