Improvements in Throttle-valves for Steam, Gas, or other Engines, and in Packings for the same, Applicable also to other Parts of Machinery.
Year: 1889

page_text: Date of Application, 20th Dec., 1889-Accepted, 8th Feb., 1890
COMPLETE DIBUI
Improvements in Throttle-valves for Steam, Gas, or other Engines,
and in Packings for the same, Applicable also to other Parts of
Machinery.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this invention (a communication to me from
abroad by George Carey Barclay of 44, Stone Street, New York, United States of
America, Merchant) and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This Invention relates to improvements in throttle valves for steam, gas, or other
engines.
The object of this invention is to construct a throttle valve by which the flow of
steam, gas, or other fluid can be regulated or controlled in a perfect manner so as to
prevent any leakage; and to facilitate the operation of the throttle valve in an easy
manner; to simplify the construction of the valve; to reduce the cost; and also to
produce a valve that is not liable to get out of order.
In the accompanying drawings figure 1 is a vertical longitudinal sectional view of
the improved throttle valve, and figure 2 is a vertical tranverse sectional view of a
piston-rod provided with the same packing that is used in the throttle valve. Similar
letters of reference indicate corresponding parts.
The shell or main body of the valve is composed of the middle or central section A
and two end sections B and C. The central section A is cored out to permit the
steam to circulate around the cylindrical valve D fitting therein. The middle or
central section A is provided at the top and bottom with an internally screw-threaded
recess into which the top and bottom sections B and C are screwed. At the inner end
of each of said recesses the section A is cored out to receive the packing rings E and F
of which the latter is provided with a bevelled surface a which is exposed so that the
steam in the section A can act on said hevelled surface and thereby press the said
packing rings E and F against the outer surface of the valve D, the packing ring E
being located in an annular recess of the packing ring F. The central section A has
a neck G to which the pipe is screwed for conducting the steam to the valve. The
bottom section C is provided with an internally screw-threaded bottom opening into
which the pipe can be screwed that conducts steam from the valve. The top section B
is provided with a stuffing box H through which the rod or stem J of the valve D
passes, said rod being pivoted to a lever K which is connected with a link L pivoted
to a lug M of the central section A. The valve D consists of a cylindrical body
having a top cross-piece D' to which the stem or rod J is secured said valve D having
a series of openings O through which the steam can pass. As the packing rings
and Fare pressed tightly against the outer surface of the valve D they form a close
joint which prevents any and all leakage of steam. The throttle valve can be
opened more or less by raising it, so that a greater or less part of the openings O
are exposed and in communication with the steam channel formed in the
section A.
The above described throttle valve is very simple and can be operated very easily
and rapidly.
In the same manner as the valve D is packed, a piston rod P may be packed by
the packing rings E and F arranged in the manner described, said packing rings being
held between the cylinder head and a recessed ring Q bolted on the cylinder head R.
In the recess of the ring Q an annular gasket S is placed.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a throttle valve, the combination, with a casing consisting of a central
recessed section and two end-sections secured together, of a hollow cylindrical valve
having openings for the passage of the fluid, which valve is packed by suitable
packing rings held in the casing and resting against the outer surface of the valve,
substantially as set forth.
2. In a throttle valve, the combination, with a casing composed of a central
recessed section and two end sections secured together, of a hollow cylindrical valve
having openings for the passage of steam and of packing rings in contact with
the outer surface of the valve, one of which packing rings is provided with
a bevel upon which the steam can act, the other packing ring resting in a recess of
the ring provided with the bevel, substantially as set forth.
3. The combination, with a rod, of a packing ring resting against the same and
provided with a bevel upon which the steam can act and with an annular recess and
of an additional packing ring placed in the recess of the packing and provided with
a bevel, substantially as set forth.
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.