IMPROVEMENTS IN 'BACK-PRESSURE' VALVES
Year: 1885

page_text: I THOMAS WITTER of 190 Blackburn Road, Bolton in the County of Lancaster,
Plumber, do hereby declare the nature of my Invention for "IMPROVEMENTS IN
'BACK-PRESSURE' VALVES," to be as follows:-
This invention relates to "back-pressure " valves constructed so as to have
almost a "straight-way" or passage through, and consists in mounting the valve
so as to be self-adjusting to ensure a perfectly tight joint.
The shell or casing containing the parts forming the complete valve is provided
with a seat set at any suitable or convenient angle to ensure alinost a straight
passage through the same when the valve is open.
The valve is hinged to a pivotted arm or lever which allows the same to work
perfectly free and adjust itself when in contact with its seat, which is necessary
to produce a tight joint.
To prevent the valve swinging too far and lock or jam itself fast in the shell or
casing it is provided with a tongue or lip which operates on the pivotted arm or
lever it is hinged to.
The pivotted arm or lever carrying the valve is mounted or hinged on a pin or
centre passing through from the outside this pin or centre is carried at one end in
a socket provided in the shell or casing; the other end in a socket in the plug or
cap employed for closing the hole or passage of admittance.
For the purpose of turning and grinding the valve seat a passage is provided in
line with the centre of saine, being enclosed from the outside with a cap or plug.
EDMUND CHADWICK,
Agent for Applicant.

page_text: Improvements in "Back-pressure" Valves.
I THOMAS WITTER, of 190 Blackburn Road, Bolton in the County of Lancaster
Plumber, do hereby declare the nature of my said Invention for "IMPROVEMENTS IN
'BACK-PRESSURE' VALVES," 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 "back-pressure" valves constructed so as to have
almost a "straight-way" or passage through and consists in mounting the valve 80
as to be self-adjusting to ensure a perfectly tight joint.
The shell or casing containing the parts forming the complete valve is provided
with a seat set at any suitable or convenient angle to ensure almost a straight
passage through the same when the valve is open.
The valve is hinged to a pivoted arm or lever which allows the same to work
perfectly free and adjust itself when in contact with its seat, which is necessary to
produce a tight joint.
To prevent the valve swinging too far and lock or jam itself fast in the shell or
casing it is provided with a tongue or lip which operates on the pivoted arm or
lever it is hinged to.
The pivoted arın or lever carrying the valve is mounted or hinged on a pin or
centre passing through from the outside: this pin or centre is carried at one end
in a socket provided in the shell or casing, the other end in a socket in the plug or
cap employed for closing the hole or passage of admittance.
For the purpose of turning and grinding the valve seat a passage is provided in
line with the centre of same, being closed from the outside with a cap or plug.
:
DESCRIPTION OF DRAWINGS.
Fig. 1 is a sectional elevation of a "back-pressure" valve constructed according
to my invention-Fig. 2 is an outside elevation of same and Fig. 3 a section through
line A. B in Fig. 1. C is the shell or casing containing the parts forming the
complete valve, the valve seat D being set at any suitable or convenient angle,
preferably 45 degrees. The valve E is hinged to the pivoted arm or lever G by the
pin H, to allow the same to work perfectly free and adjust itself when in contact
with the seat D. The pivoted arm or lever G is mounted or hinged on the pin
or centre I; the latter is supported at one end in the socket J, the other end in the
plug or cap L.
The valve E is provided with the tongue or lip M which operates on the pivoted
arm or lever G when it is lifted from its seat and prevents it locking or fastening
itself in the shell or casing C.
The passage N is provided to facilitate turning and grinding of the valve and
seat, being closed by the cap or plug O.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
The combination of the inclined valve E, tongue or lip M, pivoted arm or lever G
and pin I, applied and operating substantially as herein described and shown on the
drawings.