A Combined Safety Valve and Water Tap.
Year: 1895

page_text: Date of Application, 22nd Aug., 1895-Accepted, 21st Sept., 1895
COMI DEL DI MUITICATION.
A Combined Safety Valve and Water Tap.
I, JOHN ABBOTT, of "Clougheast," Silverdale Road, Eastbourne, in the County
of Sussex, Engineer, 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 :-
The present invention relates to further improvements in the class of combined
safety valve and water tap described in the Specification of my prior application
for Patent No. 13029 dated 5th July 1895, the object being to apply the invention
to that class of taps and valves in which no packing or washers are employed,
such as those described in the Specifications of Letters Patent No. 5471 dated
30th March 1889, and No. 3864 dated 4th March 1891 both granted to
Sir William Thomson, so as to convert such taps into combined safety valves
and taps.
The manner of carrying my improvements into effect is illustrated in the
accompanying drawing which is a longitudinal section of a combined safety valve
and tap embodying my invention.
E is the valve which is normally forced to its seat D in the passage B of the tap
by a spring 1 interposed between it and the cup L formed on the end of the screw
spindle F working through the cap G of the tap casing A so as to raise the valve E
from its seat when it is desired to draw off water or other liquid. It will be seen
that the valve E has two small ears or projections e engaging slots / formed in the
cup L near its lower end so that when the screw spindle is turned in the proper
direction it will raise valve E from its seat. The reverse movement of spindle F
lowers valve E and enables same by the action of spring I to be forced to seat D
in passage B thus closing the tap.
In order to enable the tap to also act as a safety valve I limit the downward
movement of the spindle F so that the valve E is still capable of upward movement
in relation to the cup L against the action of spring I, when the tap is closed.
For this purpose I may employ any suitable stop on the spindle F, such as the
collar H which by contact with the top of the cap G of casing A arrests the
downward movement of the spindle. It will thus be seen that when the tap is
closed should any excessive pressure occur in passage B, same acting on the
under surface of valve E will force the latter from its seat D, against the action of
spring I, and thus open the passage to the outlet C, and so relieve such pressure,
when spring I will automatically close the valve again.
Instead of the collar H on spindle F any other suitable means may be employed
for limiting the downward movement of such spindle.
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 combined safety valve and tap consisting in a valve acted upon by a screw
spindle so as to raise and lower same, a spring being interposed between such valve
and spindle, in combination with means for limiting the downward movement of
such spindle, all substantially as and for the purpose specified.
Dated this 19th day of August 1895.}
ALLISON BROS.,
Agents for the Applicant.