Improved Exhaust Valve for Steam Engines of the Corliss Type.
Year: 1892

page_text: Date of Application, 14th Apr., 1592-Accepted, 14th May, 1892
COMPLETE SPECIFICATION.
Improved Exhaust Valve for Steam Engines of the Corliss Type.
I PHIROZSHAW SORABJI MHENTI of Surat, Bombay Presidency, India 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 said invention relates to an improved construction of exhaust valve for steam
engines of what is commonly known as the Corliss type. Such exhaust valves have
cylindrical faces and have an alternating rotative motion imparted to them by the
spindle or rocking shaft on which they are mounted. Each valve works in a
cylindrical valve chest hereinafter referred to as the exhaust cylinder.
According to my said invention I construct such a valve in two parts or sections.
having their faces opposite to each other and operated simultaneously by a common
spindle. The two sections are forced asunder and pressed against their bearing
surfaces in the exhaust cylinder by spiral springs in such a manner that when the
piston of the steam engine is at the end of its stroke the top section of the exhaust
valve closes the port or communication between the steam cylinder and the exhaust
cylinder and prevents the admission of fresh steam into the clearance ports of the
exhaust cylinder thus saving steam at each stroke of the piston.
In the accompanying drawings
Fig. 1 is a longitudinal section of one end of a steam engine cylinder showing a
cross section through CD of Fig. 2 of a Corliss exhaust valve constructed in
accordance with my said invention.
Fig. 2 is a cross section of part of such a steam engine cylinder showing a longi-
tudinal section through A B of Fig. 1 of the exhaust valve.
Fig. 3 is an end view of the exhaust valve and exhaust cylinder.
In the said figures VS is the valve spindle having an alternating rotative or
oscillatory motion obtained in the usual manner. a a are blocks attached to the.
valve spindle or formed solid therewith and provided with fins or prolongations a¹
which take into recesses a³ in the upper and lower sections marked V and V¹
respectively of the valve.
The two sections are forced asunder by powerful spiral springs S S held in
position by screwed studs b b.
The number and strength of the springs may be varied so long as their collective
force is sufficient to resist the pressure of the steam acting on the upper face of the
top section of the valve when it closes the port communicating with the interior of
the steam cylinder.
In order to minimise friction the face of the bottom section of the valve may be
recessed or grooved as at c c so as to bear only on comparatively narrow ribs.
I do not confine myself to the exact proportion or shape or mode of actuating the
valve shown in the accompanying drawings which are only intended to give an
example of the mode of carrying into effect my said invention and the details may
be varied considerably without departing from the essential features of my said
invention.
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.-
A sectional steam engine exhaust valve the two parts of which are forced asunder
1
indial volve chest by the

page_text: resilience of internal springs substantially as hereinbefore described and set
forth.
Dated this 13th day of April 1892.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicant.