IES85114Y1 - A filter unit and a valve comprising the filter unit - Google Patents
A filter unit and a valve comprising the filter unitInfo
- Publication number
- IES85114Y1 IES85114Y1 IE2008/0274A IE20080274A IES85114Y1 IE S85114 Y1 IES85114 Y1 IE S85114Y1 IE 2008/0274 A IE2008/0274 A IE 2008/0274A IE 20080274 A IE20080274 A IE 20080274A IE S85114 Y1 IES85114 Y1 IE S85114Y1
- Authority
- IE
- Ireland
- Prior art keywords
- filter
- accommodating chamber
- valve
- vent opening
- primary
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 66
- 230000001276 controlling effect Effects 0.000 claims abstract description 9
- 238000010926 purge Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 14
- 238000011144 upstream manufacturing Methods 0.000 description 10
- 238000001914 filtration Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000001808 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/048—Arrangements for compressed air preparation, e.g. comprising air driers, air condensers, filters, lubricators or pressure regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
Abstract
ABSTRACT The present invention relates to a filter unit, and to a valve comprising the filter unit, and in particular, the invention relates to such a filter unit and a valve for controlling a compressed air supply, although, needless to say, the valve and the filter unit may be used for controlling the supply of other fluids, both in liquid and gaseous.
Description
A filter unit and a valve comprising the filter unit
The present invention relates to a filter unit, and to a valve comprising the filter unit,
and in particular, the invention relates to such a filter unit and a valve for controlling a
compressed air supply, although, needless to say, the valve and the filter unit may
be used for controlling the supply of other fluids, both in liquid and gaseous.
In the supply of compressed air to pneumatically operated apparatus, particularly
such pneumatically operated apparatus which is controlled by pneumatic valves and
the like, it is essential that a clean supply of compressed air is provided. This, thus,
requires filtering of the compressed air in a compressed airline prior to the
compressed air being delivered to the pneumatic apparatus, However, the provision
of a filter in a compressed air line can be problematical. In particular, due to the fact
that filters require regular cleaning and/or replacement, it is essential that such filters
be easily accessible for replacement and cleaning. In general, in known filtering
systems for filtering compressed air, the filter is not always easily accessible.
Furthermore, in general, it is necessary to withdraw the filter from a chamber in
which the filter is located for the purpose of cleaning or replacing the filter. This is
time consuming, and in certain cases can be hazardous due to the fact that the
chamber may be pressurised as access is being gained to the filter.
There is therefore a need for a filter unit, and a valve comprising the filter unit, which
addresses these problems.
The present invention is directed towards providing a filter unit, and a valve
comprising the filter unit which is suitable for controlling and filtering a fluid supply
which addresses at least some of the problems of prior art valves and filter units.
According to the invention there is provided a filter unit comprising a filter housing
defining a filter accommodating chamber for accommodating a filter element therein,
a fluid inlet formed in the filter housing communicating with the filter accommodating
chamber, and a fluid outlet formed in the filter housing communicating with the filter
accommodating chamber, an access opening formed in the filter housing to the filter
accommodating chamber for accommodating a filter element therethrough to the
filter accommodating chamber, a primary closure element releasably and sealably
engageable in the access opening for sealably closing the access opening and for
retaining the filter element in the filter accommodating chamber, a vent opening in
the primary closure element for venting the filter accommodating chamber, and a
secondary closure element releasably and sealably engageable in the vent opening
for sealably closing the vent opening.
In one embodiment of the invention the secondary closure element is operable in
three states, namely, a closed state engaged in the vent opening sealably closing
the vent opening, a purging state disengaged from the vent opening for facilitating
purging of the filter accommodating chamber through the vent opening, and an
intermediate state engaged in the vent opening permitting restricted communication
through the vent opening with the filter accommodating chamber for venting thereof.
Preferably, the vent opening is provided by an elongated primary bore extending
through the primary closure element.
Advantageously, the primary bore is internally threaded, and the secondary closure
element is externally threaded for engaging the internal threads in the primary bore
for securing the secondary closure element in sealable engagement in the closed
state in the primary closure element.
In one embodiment of the invention a secondary sealing means is provided for
sealing the secondary closure element in the closed state in the primary closure
element.
Preferably, the primary bore extending through the primary closure element defines
a secondary valve seat for sealably engaging the secondary sealing means with the
secondary closure element in the closed state.
Advantageously, the secondary sealing means comprises a secondary O—ring seal
located on the secondary closure element.
Preferably, the secondary closure element is operable in the intermediate state in
the primary bore with the secondary sealing means disengaged from the valve seat
defined by the primary bore.
in one embodiment of the invention an elongated secondary bore extends into the
secondary closure element from a downstream end to an upstream end, and the
upstream end of the secondary bore is closed by an upstream end cap adjacent the
upstream end thereof, and at least one venting bore extending through the
secondary closure element communicates the secondary bore with the filter
accommodating chamber through the primary bore when the secondary closure
element is in the intermediate state for facilitating venting of the filter accommodating
chamber.
Preferably, each venting bore extends from the secondary closure element
downstream of the secondary sealing means.
In one embodiment of the invention the secondary closure element comprises a
secondary plug member.
Preferably, the access opening is formed by an elongated internally threaded access
bore for engaging a correspondingly externally threaded portion of the primary
closure element.
In one embodiment of the invention a primary sealing means is provided for sealing
the primary closure element in the access bore.
Preferably, a primary valve seat is formed in the access bore, and the primary
sealing means is located on the primary closure element and is engageable with the
primary valve seat.
In one embodiment of the invention the primary sealing means comprises a primary
O-ring seal.
in another embodiment of the invention the primary closure element comprises a
primary plug member.
in another embodiment of the invention the filter housing is formed by a portion of a
main housing, another portion of the main housing forming a valve housing having a
valve chamber therein, a main inlet port and a main outlet port being provided in the
main housing, one of the main inlet port and the main outlet port being formed in the
valve housing for providing one of an inlet to and an outlet from the valve chamber,
and the other of the main inlet and the main outlet being formed by one of the fluid
inlet and the fluid outlet of the filter housing.
Preferably, the valve chamber communicates with the filter accommodating chamber
through one of the fluid inlet and the fluid outlet.
Advantageously. the valve chamber communicates with the filter accommodating
chamber through the fluid inlet.
Preferably, the main outlet port is formed by the fluid outlet of the filter housing.
Advantageously, a valving element is located in the valve chamber.
Preferably, the valving element is provided by a valving member of ball shape
construction.
Ideally, the valve chamber is located upstream of the filter accommodating chamber.
Preferably, the fluid inlet and the fluid outlet of the filter housing are arranged for
accommodating flow of fluid in a generally axial direction and a generally radial
direction sequentially through a filter element located in the filter accommodating
chamber.
Advantageously, the fluid inlet and the fluid outlet of the filter housing are arranged
to accommodate fluid through a filter element located in the filter accommodating
chamber initially in the generally axial direction and subsequently in the generally
radial direction.
In one embodiment of the invention the fluid inlet defines a centrally located inlet
axis, and the fluid outlet defines a centrally located outlet axis, the fluid inlet and the
fluid outlet being disposed relative to each other so that a plane containing the inlet
axis and a plane containing the outlet axis are disposed at approximately 90° to each
other.
_ The invention also provides a valve comprising the filter unit according to the
invention.
Further the invention provides a valve comprising a main housing forming a filter
housing defining a filter accommodating chamber for accommodating a filter element
therein, and a valve housing defining a valve chamber communicating with the filter
accommodating chamber through one of a fluid inlet to the filter accommodating
chamber and a fluid outlet from the filter accommodating chamber, and a valving
element being located in the valve chamber for controlling the flow of fluid through
the valve chamber and the filter accommodating chamber, an access opening
formed in the filter housing to the filter accommodating chamber for accommodating
a filter element therethrough to the filter accommodating chamber, a primary closure
element releasably and sealably engageable in the access opening for sealably
closing the access opening and for retaining the filter element in the filter
accommodating chamber, a vent opening in the primary closure element for venting
the filter accommodating chamber, and a secondary closure element releasably and
sealably engageable in the vent opening for sealably closing the vent opening.
In one embodiment of the invention a main inlet port and a main outlet port are
provided in the main housing, one of the main inlet port and the main outlet port
being formed in the valve housing for providing one of an inlet to and an outlet from
the valve chamber, and the other of the main inlet and the main outlet being formed
by one of the fluid inlet and the fluid outlet of the filter accommodating chamber.
Preferably, the valve chamber communicates with the filter accommodating chamber
through the fluid inlet.
Advantageously, the main outlet port is formed by the fluid outlet of the filter
accommodating chamber.
Preferably, the fluid inlet and the fluid outlet of the filter accommodating chamber are
arranged for accommodating flow of fluid in a generally axial direction and a
generally radial direction sequentially through a filter element located in the filter
accommodating chamber.
Advantageously, the fluid inlet and the fluid outlet of the filter accommodating
chamber are arranged to accommodate fluid through a filter element located in the
filter accommodating chamber initially in the generally axial direction and
subsequently in the generally radial direction.
Ideally, the fluid inlet defines a centrally located inlet axis, and the fluid outlet defines
a centrally located outlet axis, the fluid inlet and the fluid outlet being disposed
relative to each other so that a plane containing the inlet axis and a plane containing
the outlet axis are disposed at approximately 90° to each other.
Preferably, the valve chamber is located upstream of the filter accommodating
chamber.
Advantageously, the valving element is provided by a valving member of ball shape
construction.
The invention will be more clearly understood from the following description of a
preferred embodiment thereof, which is given by way of example only, with reference
to the accompanying drawings, in which :
Fig. 1 is a partly sectional front elevational view of a valve according to the
invention incorporating a filter unit also according to the invention,
Fig. 2 is a view substantially similar to Fig. 1 of the valve of Fig. 1 in a
different state,
Fig. 3 is a view substantially similar to Fig. 1 of the valve of Fig. 1 in another
different state,
Fig. 4 is a view substantially similar to Fig. 1 of the valve of Fig. 1 in a further
different state,
Fig. 5 is an enlarged transverse cross-sectional front elevational view of a
detail of the valve of Fig. 1 illustrating the valve of Fig. 1 in the state of Fig. 1,
Fig. 6 is an enlarged transverse cross-sectional front elevational view of a
portion of the valve of Fig. 1 illustrating the valve in the state of Fig. 2.
Referring to the drawings, there is illustrated a valve according to the invention,
indicated generally by the reference numeral 1, for controlling the supply of a fluid,
which in this embodiment of the invention is compressed air. In this embodiment of
the invention the valve is manually operable, although it may be solenoid operated or
operated by any other means. The valve 1 incorporates a filter unit, also according
to the invention and indicated generally by the reference numeral 2 for filtering the
compressed air as it passes through the valve 1. The valve 1 is a ball valve and
comprises a main housing 3 which forms a valve housing 4 and a filter housing 5
which is integral with the valve housing 4, and forms the filter unit 2. A valve
chamber 6 is formed within the valve housing 4, and a valving element, namely, a
valving member 7 of ball shape construction is located in the valve chamber 6 for
controlling fluid flow through the valve chamber 6. A hand knob 8 carried on a shaft
9 extending from the valving member 7 is provided for operating the valving member
7 between an open state and a closed state. The operation of such ball valves and
valving members of ball shape construction will be well known to those skilled in the
art.
The filter housing 5 defines a filter accommodating chamber 10 which communicates
with the valve chamber 6, and within which a filter element 11 is located for filtering
the fluid through the valve 1. A main inlet port 12 in the main housing 3 is provided
for coupling to a fluid source and for delivering the fluid into the valve chamber 6 in
the valve housing 4. A main outlet port 13 in the main housing 3 forms a fluid outlet
14 from the filter accommodating chamber 10 through which fluid is delivered from
the filter accommodating chamber 10, and in turn from the valve 1. A fluid inlet 15 to
the filter accommodating chamber 10 communicates the filter accommodating
chamber 10 with the valve chamber 6 for facilitating fluid flow from the valve
chamber 6 to the filter accommodating chamber 10.
The valve chamber 6 and the filter accommodating chamber 10 are located relative
to each other, and the fluid inlet 15 and the fluid outlet 14 are also located relative to
each other, so that fluid passing through the valve 1 passes from the valve chamber
6 into the filter accommodating chamber 10 through the fluid inlet 15, and passes
initially in a generally axial direction into the filter element 11 and subsequently in a
generally radial direction from the filter element 11 through the fluid outlet 14. This is
achieved by virtue of the fact that the fluid inlet 15 defines a central inlet axis, and
the fluid outlet 14 defines a central outlet axis, which is perpendicular to the central
inlet axis.
An access opening formed by an internally threaded access bore 16 accommodates
the filter element 11 into and out of the filter accommodating chamber 10. A primary
closure element comprising an externally threaded primary plug member 17 is
engageable with the internally threaded access bore 16 for retaining the filter
element 11 in the filter accommodating chamber 10, and for releasably and sealably
closing the filter accommodating chamber 10. A primary sealing means, namely, a
primary O-ring seal 18 located in a primary groove 19 extending externally
circumferentially around the primary plug member 17 sealably engages a primary
valve seat 20 formed in the access bore 16 for sealably closing the access bore 16.
A vent opening provided by an elongated primary bore 21 extends axially through
the primary plug member 17 and communicates through the primary plug member
17 with the filter accommodating chamber 10 for facilitating venting and purging the
valve 1. A secondary closure element, namely, a secondary plug member 22 is
engageable in the primary bore 21 and is operable in three states, namely, a closed
state illustrated in Figs. 1 and 5 sealably closing the primary bore 21, a purging state
illustrated in Fig. 3 with the secondary plug member 22 disengaged and removed
from the primary bore 21 for facilitating purging of the filter accommodating chamber
, and an intermediate state illustrated in Figs. 2 and 6 for facilitating venting of the
filter accommodating chamber 10, prior to purging of the filter accommodating
chamber 10 or prior to removal of the filter element 11. The secondary plug member
22 is externally threaded at 23 for engaging corresponding internal threads 24 of the
primary bore 21.
A secondary sealing means comprising a secondary O—ring seal 25 is located in a
secondary groove 26 extending externally circumferentially around the secondary
plug member 22 adjacent an upstream end 27 thereof for engaging a secondary
valve seat 28 formed in the primary bore 21 for sealing the secondary plug member
22 in the primary plug member 17 when the secondary plug member 22 is in the
closed state, for in turn sealably closing the filter accommodating chamber 10.
An elongated secondary bore 30 extends axially into the secondary plug member 22
from a downstream end 31 to the upstream end 27, and is closed at the upstream
end 27 by an end cap 32. A pair of radial venting bores 34 extend radially through
the secondary plug member 22 downstream of the secondary O-ring seal 25 for
communicating the secondary bore 30 with the filter accommodating chamber 10
through the primary bore 21 when the secondary plug member 22 is engaged in the
primary bore 22, and is in the intermediate state illustrated in Figs. 2 and 6 with the
secondary O-ring seal 25 disengaged from the secondary valve seat 28 for
facilitating venting of the filter accommodating chamber 10 through the secondary
bore 30.
A counter-bore 35 is formed in the primary bore 21 upstream of the valve seat 28 for
accommodating a downstream end 36 of the filter 11 in the primary plug member 17.
The main inlet port 12 is externally threaded at 35 for coupling the valve 1 to a
compressed air supply, and the main outlet port 13 is externally threaded at 36 for
facilitating connection of the valve 1 to a suitable coupling of pneumatically operated
apparatus. The main outlet port 13 may be coupled to the pneumatically operated
apparatus through, for example, a solenoid controlled valve (now shown).
The main housing 3 and the components of the valve 1, including the valving
member 7, the shaft 9 and the primary and secondary plug members 17 and 22 may
be of any suitable material, and typically will be of metal, such as steel, brass or
stainless steel; The filter element 11 may be of any suitable material, and typically,
will be a porous sintered filter element.
in use, the valve 1 is coupled into a pipe-work system in which the flow of fluid is to
be controlled. As mentioned above, the valve 1 is particularly suitable for use in a
compressed air system for providing a compressed air supply to pneumatically
operated apparatus through, for example, a solenoid operated valve (not shown).
The main inlet port 12 is coupled to the compressed air supply, and the main outlet
port 13 is coupled to the solenoid operated valve (not shown). With the filter element
11 located in the filter accommodating chamber 10, and the primary plug member 17
sealably secured in the access bore 16, and the secondary plug member 22 sealably
secured in the primary bore 21 of the primary plug member 17 in the closed state,
the valve 1 is ready for use. When it is desired to deliver compressed air through the
valve 1 to the solenoid valve (not shown), the hand knob 8 is operated for operating
the valving member 7 into the open state and the hand knob 8 is operated for
operating the valving member 7 into the closed state when the solenoid valve (not
shown) is to be isolated from the compressed air supply.
When it is desired to purge the filter accommodating chamber 10 and the filter
element 11, the hand knob 8 is operated for closing the valve 1. The secondary plug
member 22 is then loosened in the primary bore 21 into the intermediate state so
that the secondary O-ring seal 25 disengages the secondary valve seat 28 for
venting the filter accommodating chamber 10 and the system downstream of the
valve 1. The secondary plug member 22 is then removed from the primary bore 21
so that the valve 1 is in the purging state. The hand knob 8 is operated for opening
the valve 1 for purging the filter accommodating chamber 10 and the filter element
11 through the primary bore 21. On completion of purging, the valve 1 is operated
into the closed state, the secondary plug member 22 is returned to and secured in
the closed state in the primary bore 21.
Should it be desired to replace the filter element 11, the hand knob 8 is operated for
closing the valve 1, and the secondary plug member 22 is loosened in the primary
bore 21 into the intermediate state for venting the filter accommodating chamber 10
and the system downstream of the valve 1. On completion of venting, the primary
plug member 17 is disengaged from the access bore 16, and as the primary plug
member 17 is being disengaged from the access bore 16, the filter element 11 is
withdrawn from the filter accommodating chamber 10. The filter element 11 is then
replaced in the counter-bore 35 in the primary plug member 17 with a new filter
element 11, and with the primary plug member 17 is entered into the access bore
16, and urged into the filter accommodating chamber 10. The primary plug member
‘I7 is then sealably secured in the access bore 16. Once the primary plug member
17 has been tightly and sealably secured in the access bore 16, the secondary plug
member 22 is then secured in the closed state in the primary bore 21, thus re-
sealing the filter accommodating chamber 10.
The advantages of the invention are many. A particularly important advantage of the
invention is that it provides a valve which in turn provides a filtered supply of fluid, for
example, compressed air to a system to which the fluid supply is to be controlled by
the valve. This is a particular advantage where the valve is used to provide a supply
of compressed air to pneumatically operated apparatus via a solenoid operated
valve. Since the compressed air supply is filtered by the valve according to the
invention prior to being delivered to the solenoid valve, the integrity of the solenoid
valve is maintained. A particularly important advantage of the valve according to the
invention is achieved when used for supplying a compressed air supply to
pneumatically operated valves. Additionally, a particularly important advantage of
the valve and the filter unit according to the invention is that the valve, the filter
accommodating chamber and the filter can be readily easily purged while the filter is
still in position in the filter accommodating chamber. This is achieved by initially
venting the filter accommodating chamber and the pneumatic system downstream of
the valve according to the invention, and then withdrawing the secondary plug
member from the primary bore so that the valve according to the invention is in the
purging state. Once the secondary plug member has been removed from the
primary bore, the valve 1, is operated into the open state for purging the valve, the
filter and the filter accommodating chamber.
Additionally, the filter unit according to the invention provides for ready and easy
removal and replacement of the filter. All that is required is to operate the secondary
plug member into the intermediate state for venting the filter accommodating
chamber, and then withdrawing the primary plug member with the secondaiy plug
member in the intermediate state from the access bore. As the primary plug
member is being withdrawn from the access bore, the filter element is withdrawn
along with the primary plug member.
A further particularly important advantage of the invention is that it provides for safe
venting of the filter accommodating chamber after the valve has been operated into
the closed state. Once the filter accommodating chamber has been safely vented,
the filter element may be safely removed or may be safely purged by removing the
secondary plug member.
While the valve 1 and the filter unit 2 have been described as being of a particular
configuration, the filter unit and the valve may be of any other suitable configuration,
and while it is desirable, it is not essential that the main outlet port 13 and the fluid
inlet 15 to the filter accommodating chamber 10 be disposed relative to each other
so that respective central axes defined by the main outlet port 13 and the fluid inlet
are disposed at right angles to each other.
While the valve 1 and the filter unit 2 have been described for use in a compressed
air system, the valve 1 and the filter unit 2 may be used in any other fluid supply
system. Additionally, it is envisaged in certain cases that the filter unit may be
provided without the valve.
It will also be appreciated that while the valve and the filter unit according to the
invention have been described for supplying compressed airto pneumatically
operated apparatus through a solenoid operated valve, the valve 1 and the filter unit
2 may be used for supplying any type of fluid to any type of system, whether the
system incorporates a solenoid operated valve, pneumatically operated valves or
othen/vise.
Claims (5)
1. A filter unit comprising a filter housing defining a filter accommodating chamber for accommodating a filter element therein, a fluid inlet formed in the filter housing communicating with the filter accommodating chamber, and a fluid outlet formed in the filter housing communicating with the filter accommodating chamber, an access opening formed in the filter housing to the filter accommodating chamber for accommodating a filter element therethrough to the filter accommodating chamber, a primary closure element releasably and sealably engageable in the access opening for sealably closing the access opening and for retaining the filter element in the filter accommodating chamber, a vent opening in the primary closure element for venting the filter accommodating chamber, and a secondary closure element releasably and sealably engageable in the vent opening for sealably closing the vent opening.
2. A filter unit as claimed in Claim 1 in which the secondary closure element is operable in three states, namely, a closed state engaged in the vent opening sealably closing the vent opening, a purging state disengaged from the vent opening for facilitating purging of the filter accommodating chamber through the vent opening, and an intermediate state engaged in the vent opening permitting restricted communication through the vent opening with the filter accommodating chamber for venting thereof.
3. A filter unit substantially as described herein with reference to and as illustrated in the accompanying drawings.
4. A valve comprising a main housing forming a filter housing defining a filter accommodating chamber for accommodating a filter element therein, and a valve housing defining a valve chamber communicating with the filter accommodating chamber through one of a fluid inlet to the filter accommodating chamber and a fluid outlet from the filter accommodating chamber. and a valving element being located in the valve chamber for controlling the flow of fluid through the valve chamber and the filter accommodating chamber, an access opening formed in the filter housing to the filter accommodating chamber for accommodating a filter element therethrough to the filter accommodating chamber, a primary closure element releasably and sealably engageable in the access opening for sealably closing the access opening and for retaining the filter element in the filter accommodating chamber, a vent opening in the primary closure element for venting the filter accommodating chamber, and a secondary closure element releasably and sealably engageable in the vent opening for sealably closing the vent opening.
5. A valve substantially as described herein with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IEIRELAND12/04/2007S2007/0263 |
Publications (1)
Publication Number | Publication Date |
---|---|
IES85114Y1 true IES85114Y1 (en) | 2009-01-21 |
Family
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