U.S. patent number 3,754,566 [Application Number 05/133,083] was granted by the patent office on 1973-08-28 for safety valve.
This patent grant is currently assigned to Societe D'Exploitation De Brevets Pour L'Industrie & La Marine Societe. Invention is credited to Francois Gemigniani.
United States Patent |
3,754,566 |
Gemigniani |
August 28, 1973 |
SAFETY VALVE
Abstract
A safety system for a pressure fluid container has a blow-off
valve to provide communication between the interior of the
container and the atmosphere, a hydraulic ram controlling the
blow-off valve, a hydraulic pressure feed circuit for the ram which
is connected to the interior of the container through a buffer
capacity, and pressure sensing means in which the pressure in the
container acts in opposition to spring loading to control pilot
valve means, so that when the container pressure rises above a
predetermined value, pressure is reduced in the hydraulic pressure
feed circuit to the ram, allowing the blow-off valve to open.
Inventors: |
Gemigniani; Francois
(Martigues, FR) |
Assignee: |
Societe D'Exploitation De Brevets
Pour L'Industrie & La Marine Societe (Martigues,
FR)
|
Family
ID: |
22456930 |
Appl.
No.: |
05/133,083 |
Filed: |
April 12, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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807640 |
Mar 17, 1969 |
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Current U.S.
Class: |
137/488 |
Current CPC
Class: |
F16K
17/10 (20130101); B65D 90/34 (20130101); Y10T
137/7762 (20150401) |
Current International
Class: |
B65D
90/22 (20060101); B65D 90/34 (20060101); F16K
17/10 (20060101); F16K 17/04 (20060101); F16k
031/12 () |
Field of
Search: |
;137/489,487.5,488,489.5,492.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Klinksiek; Henry T.
Assistant Examiner: Miller; Robert J.
Parent Case Text
This is a continuation-in-part of my co-pending United States
Patent application Ser. No. 807640 dated 17th March 1969 now
abandoned.
Claims
I claim:
1. A safety system for a pressure fluid container comprising in
combination, a blow-off valve to provide communication between the
interior of the container and the atmosphere, a hydraulic ram
controlling the blow off valve, a hydraulic pressure feed circuit
for the ram which is connected to the interior of the container
through a buffer capacity, pressure sensing means in which the
pressure in the container acts in opposition to spring loading to
control pilot valve means so that when the container pressure rises
above a predetermined value, pressure is reduced in the hydraulic
pressure feed circuit of the ram, allowing the blow-off valve to
open, and valves which when closed isolate the pressure sensing
means from the buffer capacity.
2. A safety system as claimed in claim 1, wherein the pilot valve
means communicate with the hydraulic feed circuit between said
buffer capacity and the ram.
3. A safety system as claimed in claim 1, wherein the hydraulic
feed circuit of the ram includes a remote control valve interposed
between the buffer capacity and the ram.
Description
The invention relates to a safety system designed to be fitted to
equipment such as containers for storage or transport of fluids,
liquids or gases, and in general to all installations where a
safety device is required.
Its aim is to provide by means of its constructional features, a
working precision suited to high-pressure equipment, and to make it
possible to ensure remote control under all circumstances.
According to the present invention a safety system for a pressure
fluid container comprises in combination, a blow-off valve to
provide communication between the interior of the container and the
atmosphere, a hydraulic ram controlling the blow-off valve, a
hydraulic pressure feed circuit for the ram which is connected to
the interior of the container through a buffer capacity, and
pressure sensing means in which the pressure in the container acts
in opposition to spring loading to control pilot valve means so
that when the container pressure rises above a predetermined value,
pressure is reduced in the hydraulic pressure feed circuit of the
ram, allowing the blow-off valve to open.
Preferably the pilot valve means communicate with the hydraulic
feed circuit between said buffer capacity and the ram.
Advantageously the hydraulic feed circuit of the ram includes a
remote control valve interposed between the buffer capacity and the
ram.
If desired butterfly valves are included in the hydraulic feed
circuit in order to isolate the pressure sensing means.
One embodiment of the invention will now be described by way of
example with reference to the accompanying drawing.
The device is shown diagrammatically as a whole.
The device comprises a blow-off valve 1, a pressure sensing means 2
which operates the blow-off valve 1 and intermediate piping 3, 4
and 5, and a buffer container 6.
The blow-off valve 1 is constituted by a casing 7 which is mounted
onto the container to be protected 22, a valve member 8 which is
urged into its closed position by means of a hydraulic ram 10, and
an outlet 9 for the fluid to be released.
The pressure sensing means 2 is provided with an upper cylinder 11
in which a thrust piston 12 is provided; the thrust piston 12 is
connected to a rod 13 and acted upon by a spring 14. The pressure
exerted upon the thrust piston 12 by the spring 14 is adjustable by
means of a threaded mounting 29 for the spring 14. The threaded
mounting 29 is engaged with a threaded portion 30 of the framework
of the pressure sensing means 2. Rod 13 acts on the stem of a valve
member 15 against spring means.
Adjacent to valve member 15 are a pressure reducer 16, a free
slidable member 17 and a filter element 18 which are all fed by
piping 19.
24, 25, 26 and 27 are butterfly valves, valve 24 being closed
during normal operation, valves 25, 26 and 27 being open.
The pressure in container 22 is transmitted through the piping 5
and then through piping 4 to the upper cylinder 11. When the
pressure in the upper cylinder 11 exceeds the pressure imposed on
the thrust piston 12 by the spring 14 it will cause the thrust
piston 12 and the rod 13 to move downwardly and open valve 15.
Opening of valve 15 will allow fluid to flow from piping 19 through
filter member 18 and pressure reducer 16 past valve 15 and out
through outlet 32.
Pressure is also transmitted through the piping 5 into the buffer
container 6 and thence via piping 21 and 19 to the lower end of the
free slidable member 17 via filter element 18.
The free slidable element 17 is urged downwardly by spring means in
combination with pressure acting on its upper end. However, when
valve 15 is open there is a release of pressure in the fluid acting
on the upper end of element 17, and a relative increase of pressure
acting through piping 19 onto its lower end. This causes element 17
to slide upwardly allowing fluid from piping 20 to flow through the
aperture 33 past the lower end of the element 17 and to escape from
the system via outlet 32. With the escape of fluid through outlet
32 pressure will be reduced in piping 3 which feeds the hydraulic
ram 10.
Following reduction of pressure in piping 3 and the consequential
reduction of pressure in the hydraulic ram 10, the valve member 8
will lift and allow excess pressure from the container 22 to escape
via outlet 9. Owing to the back pressure in the piping 3 the valve
member 8 will open smoothly but completely.
After valve member 8 has opened the pressure in container 22 will
fall and the pressure drop will be transmitted via piping 5 and 4
to the upper cylinder 11 of the sensing means 2, which will cause
the thrust piston 12 and rod 13 to move upwardly under the
influence of spring 14. Valve 15 will then close under the action
of its own spring. (Valve 15 is of the type commonly called a
"clack", i.e. it is either wholly open or wholly closed, it has no
intermediate positions).
When valve 15 closes fluid entering the pressure sensing means 2
via piping 19 passes through filter element 18 and pressure reducer
16 acts on the upper end of free slidable member 17 and with the
aid of the spring moves the free slidable member 17 downwards into
the aperture 33 thus cutting off the flow through the outlet 32.
This in turn causes pressure to be re-established in piping 20 and
3.
When the pressure in piping 20 and 3 builds up and attains the
pressure in container 22 the hydraulic ram 10 will move downwardly
causing valve member 8 to close and the apparatus is reset.
Buffer container 6 protects the pressure sensing means 2 from
sudden shocks caused by a rapid rise or fall in pressure.
It is possible, by opening the butterfly valve 24, and closing the
butterfly valves 25, 26, to eliminate the part played by the
pressure sensing means 2, while retaining the possibility of
remotely controlling the safety valve by operating a remote control
valve 23.
The butterfly valve 27 makes it possible, by the closing of the
butterfly valves 25, 26, 27, completely to isolate the pressure
sensing means and possibly to replace it with an instrument
calibrated in advance, this to allow inspection of the pressure
sensing means without shutting down the installation.
The remote control valve 23 allows the safety valve to be operated
irrespective of the pressure inside the container 22, by manually
allowing pressure to drop in piping 3.
This remote control valve 23 may be incorporated in a control panel
even a considerable distance from the container.
The sensing means 2 is fitted with the filter element 18 so that
the circuits cannot become blocked, and the operating of the free
slidable member 17 and the valve 15 cannot be disturbed, which
makes the device completely safe in operation. All parts are
immediately accessible.
* * * * *