Improvements in Direct Acting Steam Pumps.
Year: 1899

page_text: Date of Application, 27th Feb., 1899
Complete Specification Left, 12th Oct., 1899-Accepted, 18th Nov., 1899
PROVISIONAL SPECIFICATION.
Improvements in Direct Acting Steam Pumps.
We, TANGYES LIMITED, of Cornwall Works, Soho, in the County of Stafford,
Engineers, and JOHN NICHOLAS FLOYD, of No. 71, Murdock Road, Handsworth,
in the County of Stafford, Mechanical Engineer, do hereby declare the nature
of this invention to be as follows:-
The said invention consists of the improvements hereinafter described on an
invention for which Letters Patent were granted to us numbered and dated
respectively 23,030 October 7th, 1897 for "Improvements in direct acting steam
pumps."
In order that the present invention may be the better understood we remark
that in the said patented invention the stems or stalks of the tappet valves are
made separate from the valve itself the upper ends of the stems or stalks bearing
against the undersides of the said tappet valves which are provided with wings
for guiding them in their motion from and to the valve seats.
Tappet valves having separate stems or stálks require when renewals are neces-
sary great nicety of adjustment in the length of the wings of the upper part or
tappet valve proper in order to ensure that the upper part or tappet valve proper
shall take a true bearing on its seat and also that the lower part or stem or stalk
shall be in contact with the underside of the valve and the object of the said
invention is to render unnecessary the skill and care requisite to effect the
nicety of adjustment referred to.
In making a tappet valve according to the present invention we make the
valve and stem or stalk in one piece the upper or valve part having two conical
faces and two seats for the same separated a short distance apart.
By this construction or arrangement of the said tappet valves escape of steam
from the steam cylinder bore into the auxiliary port during the working of the
pump is prevented and the escape or leakage of steam from the steam chest into
the exhaust port is also prevented.
Dated this Twenty-seventh day of February 1899
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Direct Acting Steam Pumps.
We, TANGYES LIMITED, of Cornwall Works, Soho, in the County of Stafford,
Engineers, and JOHN NICHOLAS FLOYD, of No. 71, Murdock Road, Handsworth.
in the County of Stafford, Mechanical Engineer, do hereby declare the nature
of the said invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
The said invention_consists of the improvements hereinafter described on an
invention for which Letters Patent were granted to us numbered and dated
respectively 23,030 October 7th, 1897 for Improvements in direct acting steam
Dumps.
"

page_text: In order that the present invention may be the better understood we remark
that in the said patented invention the stems or stalks of the tappet valves are
made separate from the valve itself the upper ends of the stems or stalks bearing
against the undersides of the said tappet valves which are provided with wings
for guiding them in their motion from and to the valve seats.
Tappet valves having separate stems or stalks require when renewals are neces-
sary great nicety of adjustment in the length of the wings of the upper part or
tappet valve proper in order to ensure that the upper part or tappet valve proper
shall take a true bearing on its seat and also that the lower part or stem or stalk
shall be in contact with the underside of the valve and the object of the said
invention is to render unnecessary the skill and care requisite to effect the
nicety of adjustment referred to.
In making a tappet valve according to the present invention we make the
valve and stem or stalk in one piece the upper or valve part having two conical
faces separated a short distance apart the tappet box or liner having two conical
seats for the two conical faces of the valve to seat themselves upon.
Figure 1 of the accompanying drawing represents in longitudinal section the
cylinder of a steam pump, the said section being taken in a plane passing through
the axes of the two tappet valves and Figure 2 represents one of the tappet valves
detached, the said tappet valve Figure 2 being drawn to a larger scale than
Figure 1.
The same letters of reference indicate the same parts in both figures of the
drawing.
-
a is the steam cylinder of the pump; d is the piston working in the said cylin-
der and by the action of which the tappet valves e, e are alternately lifted thereby
opening communication between the tappet boxes h, and the longitudinal
passage communicating at with the atmosphere. The crossing pipes of the
pump described and shown in the specification of the patent hereinbefore referred
to are screwed into the screwed holes g, g of the tappet boxes h, h.
The tappet valves e,e are provided with two conical parts or faces marked e¹, e²
respectively, which faces take a bearing on conical valve seats h1, h2 formed in
a brass box or liner 3 fitted into the tappet box h.
By this construction or arrangement of the said tappet valves e, e escape of
steam from the steam cylinder into the auxiliary port during the working of
the pump is prevented and the escape or leakage of steam from the steam chest
into the exhaust port is also prevented.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that we
claim as the said invention:
:―
In direct acting steam pumps of the kind described represented and claimed
in the Specification of Letters Patent No. 23030 of 1897, making each of the
tappet valves and its stem or stalk in one piece and with two conical parts or
faces separated a short distance apart for taking on corresponding seats in the
tappet box or liner substantially as and for the purposes hereinbefore described
and illustrated in the accompanying drawing.
TANGYES LIMITED,
GEORGE TANGYE,
WM. TANGYE,
}
Directors.
W. J. PARKINS, Secretary.
JOHN NICHOLAS FLOYD.