Improvements in Drain and Relief Valves for the Cylinders and Steam Pipes of Steam Engines.
Year: 1890

page_text: Date of Application, 25th June, 1890
Complete Specification Left, 25th Mar., 1891--Accepted, 25th Apr.,
1891
PROVISIONAL SPECIFICATION.
Improvements in Drain and Relief Valves for the Cylinders and
Steam Pipes of Steam Engines.
We, JOHN PHILLIPSON, of 89, Mill Lane, Bradford, in the County of York,
Mechanic, and JONATHAN RUSHFORTH, of St. Dunstan's Mill, Bradford, aforesaid,
Spinner, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in that class of drain and relief valves for
the cylinders and steam pipes of steam engines in which the valve is automatically
closed by the steam pressure acting upon a piston connected thereto when the engine
is started, and opened by the pressure of a spring when the steam pressure is
removed to stop the engine, in a similar manner to that described by the said
John Phillipson in the Specification of his Application for Letters Patent
No. 14,841 of 1889.
The said improvements consist in arrangements for regulating or adjusting the
pressure of the spring opening the valve and also for keeping the piston steam tight
when the valve is closed.
To regulate the pressure of the spring opening the valve I provide an adjustable
collar on the shank of the valve or on the valve spindle for said spring to bear
against and thus regulate the extent said spring is compressed when the valve
is closed, or said adjustable bearing may be fixed inside the valve casing.
To make said piston more perfectly steam tight I form a valve face on the front
of the piston so arranged in relation to said projecting valve that when the latter
meets its seat and is closed said valve face meets a seat in the casing and thus
prevents the steam passing the piston although such piston only fits its case loosely
or imperfectly.
Or the valve and piston may be capable of slight independent motion and a
spring introduced between them sufficiently strong to keep the valve to its seat, but
not strong enough to withstand the full pressure of the steam upon the larger area
of the piston and thus allow the valve face on said piston to move to its seat after
the valve is closed.
Dated this 24th day of June 1890.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Drain and Relief Valves for the Cylinders and
Steam Pipes of Steam Engines.
We, JOHN PHILLIPSON, of 89, Mill Lane, Bradford, in the County of York,
Mechanic, and JONATHAN RUSHFORTH, of St. Dunstan's Mill, Bradford, aforesaid,
Spinner, 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 :-
This invention relates to improvements in that class of drain and relief valves
for the cylinders and steam pipes of steam engines in which the valve is auto-
matically closed by the steam pressure acting upon a piston connected thereto when
the engine is started, and opened by the pressure of a spring when the steam
pressure is removed to stop the engine, in a similar manner to that described by the
Baid John Phillipson in the Specification of his Letters Patent No. 14,841 of 1889.
The said improvement consists in arrangements for regulating or adjusting the
Price d

page_text: pressure of the spring opening the valve and also for keeping the piston steam tight
when the valve is closed.
To regulate the pressure of the spring opening the valve I provide an adjustable
collar on the shank of the valve or on the valve spindle for said spring to bear
against and thus regulate the extent said spring is compressed when the valve is
closed, or said adjustable bearing may be fixed inside the valve casing.
To make said piston more perfectly steam tight I form a valve face on the front
of the piston so arranged in relation to said projecting valve that when the latter
meets its seat and is closed said valve face meets a seat in the casing and thus
prevents the steam passing the piston although such piston only fits its case loosely
or imperfectly.
Or the valve and piston may be capable of slight independent motion and a
spring introduced between them sufficiently strong to keep the valve to its seat, but
not strong enough to withstand the full pressure of the steam upon the larger area
of the piston and thus allow the valve face on said piston to move to its seat after
the valve is closed.
In order to fully describe our invention reference is made to the accompanying
sheet of drawings forming a part of this Specification, in which similar letters of
reference indicate corresponding parts in each of the figures.
Figure 1, represents a longitudinal sectional elevation of our improved drain
and relief valve in which the piston and valve are formed in one piece or rigidly
connected.
Figure 2, is a separate view of the piston and valve, and Figure 3, is an end view
of the same.
Figure 4, is a longitudinal section of a modified form of casing fitted with a piston
and valve capable of slight independent motion.
Figure 5, is a cross section of the valve and casing on the line a b of the former
figure.
Figure 6, is a separate sectional view of the valve and piston, and
Figure 7, is a separate view of the valve in section.
In Figure 1, the casing A is similar to that shown in the above cited Letters
Patent but a valve seat B is formed in the casing to meet the valve face i formed
on the front d of the piston E when the valve F meets the valve seat e and
closes the passage D. By this arrangement in case the valve piston E does not
fit the casing A with sufficient accuracy to prevent the passage of steam it is
rendered steam tight when the valve F is closed by the face i resting against
the seat B.
The shank of the valve has a thread formed upon it fitted with the collar J
and the spring H is arranged to bear against such collar so that by adjusting
the position of such collar the pressure exerted by the spring when the valve is
closed may be regulated. From the foregoing description it will be obvious that an
adjustable bearing for the opposite end of the spring may be fitted in the casing A
to answer the same purpose as the adjustable collar J.
The
In the arrangement represented in Figures 4, and 5 the passage D is carried
round the end of the casing A so as to be in a line with the passage C. The
screwed shank f of the valve F is made hollow to fit the pin j projecting from the
front of the piston E and two adjustable collars J and J¹ are mounted upon it.
A spring H arranged in a similar manner and for the same purpose as the
spring H (Figure 1) is provided to bear against the collar J and a stout
spring his introduced between the collar J¹ and the front of the piston.
strength of the spring his such and the collar J¹ so adjusted that when the steam
is applied to the rear of the piston the spring H₁ is first compressed and the
valve F closed then the spring his compressed until the valve face i meets the
valve seat B. In this arrangement the valve F and the seat e do not require to
be so accurately situated in relation to the valve i and seat B as in the arrangement
first described.

page_text: Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare what we
claim is :-
1. In a drain and relief valve for the cylinders and steam pipes of steam
engines operated by a piston, a valve adapted to keep said piston steam tight
substantially as herein shown and described and illustrated in the accompanying
'drawings.
2. In a drain and relief valve for the cylinders and steam pipes of steam engines
operated by a piston capable of motion apart from the valve the use of a spring
introduced between the valve and the piston, substantially as herein shown and
described.
3. In a drain and relief valve for the cylinders and steam pipes of steam engines
closed by a piston and opened by a spring, an adjustable bearing to regulate the
pressure of said spring, substantially as herein shown and described.
Dated this outh 1
SML 1001
DRACUP & NOWELL,
Bradford, Agents.