Title of Invention

A VALVE TO CONTROL LOADING OF A LIQUID GAS FROM A TANK INTO GAS-POWERED VEHICLES

Abstract The invention relates to a valve to control loading of a liquid gas from a tank, into gas powered vehicles, comprising a valve body having a gas input passage (12) connectable to a supply system and a branch, forming an input valve housing (14) and to which is attached a correspondingly dimensioned element (15) having an end head (17), wherein said correspondingly dimensioned element forms an axial duct (19) having, on a first side, a lead-in neck (16) openable towards the valve housing (14) through an intermediate chamber (18), on an opposite side of the axial duct (19) a bottom wall with a central bore, and at least one gas exit bore (22) laterally extending towards the tank, wherein the end head of said element (15) accommodating a turning cam shaft (31) connected to liquid level indicator in the tank, and wherein a first movable stop valve (24) disposed in said chamber (18) being associated with the input valve housing (14), said lateral exit bore (22) associated with a second stop valve (26) movable in said axial duct (19), said stop valves (24,26) being held by a guide rod (25) having a distal end that interacts with said cam shaft (31), a first spring (29) associated with the first stop valve (24) to hold the first stop valve (24) normally in a closed position in said valve housing (14), and one each second and third springs (30, 30') associated with the second stop valve (26) to hold the second stop valve (26) normally in a closed position in respect of the lateral exit bore (22), said first, second and third springs (29, 30, 30') are configured to allow a concurrent movement of the first and second stop valves (24,26) to an open position for the flow of the fluid to the tank due to the presence of a pressure at the input of the valve body and to a closed position to automatically stop the flow of the fluid to the tank upon attaining at least 80% load capacity in the tank detected by a level detector.
Full Text This invention relates to a valve to control the loading of a gas, such as LPG,
into a fuel tank with the help of a float or other means of detecting the level of the gas
in the tank.
Valves for this use are already well-known which include mainly a body with an
input passage of a gas supplied by a filling station, an output passage of the gas into
or towards a tank to be filled, a valve housing to place the input passage in
communication with the output passage and which is associated with a stop valve.
The stop valve is normally maintained in a closed position in the valve housing, held
by a return spring. It opens only when under pressure from the gas supplied by the
filling station and is calibrated to stop the gas entering on reaching 80% of the
capacity of the tank load so as to control the maximum filling load of the tank as
envisaged.
It is however the objective of this invention to supply a valve for the
abovementioned use, achieved by a new, original device and combination of elements
to ensure precise and reliable operating over the years.
Another objective of the invention is to supply a control valve for filling gas into
a tank equipped with two stop valves operating in conjunction with the help of a
respective play of springs to conveniently open and stop the flow of gas into the tank
depending on the load status of the latter detected by a float or some equivalent
system..


These objectives are reached, in compliance with the invention, with a load
control valve at 80% of a liquid gas tank according to the part in particular of claim 1.
This invention will however be described more in detail in the continuation of

this description made in reference to the enclosed indicative and not limiting accompanying drawings,
in which:
Fig. 1 shows, a cross section of the valve in the initial closed position;
Fig. 2 shows the same cross section of the valve in the open position for the
flow of gas fuel into the tank; and
Fig. 3 shows, always in cross section, the valve in the gas stop position towards
the tank on reaching an 80% load capacity;
Fig. 4 shows a cross section of the only complementary element supporting a
cam shaft to which the float is connected;
Fig. 5 shows a cross section in direction of arrows V-V in Fig. 4;
Fig. 6 shows a view seen from above, of the complementary element of Figs. 4
and 5; and
Fig. 7 shows a view of a first stop valve.
As shown, the valve under examination includes a body 11 with a gas input
passage 12, coming from a gas supply coupling, not shown, and a branch 13, in which
an input valve housing is designed which is in communication with passage 12.
A complementary element 15 is attached to branch 13, which forms, at one end
(the one at the top in the drawing), a lead-in neck 16 facing towards the valve housing
14 and, at the other end, a head 17.
Between the input valve housing 14 and the lead-in neck 16 there is a chamber
18, and the element 15 forms a duct 19 which axially is open towards the chamber 18
on one side and, on the opposite side, is blocked by a bottom wall 20 crossed by a
central through hole 21. Laterally, the element 15 has at least one output hole 22,


triangular in shape, increasing in size in the direction of the bottom wall 20 - Fig. 4-
and positioned to place the axial duct 19 in communication with the tank to be loaded,
not shown. In the bottom wall 20 of the element 15, one or more bleeder holes 23 -
Fig. 6 can be provided.
In chamber 18 is housed a first stop valve 24 with a stem 24' inserted and
sliding axially in a bell shaped section 125 integral with a rod 25, which extends into
the duct 19 and enters the bottom hole 21 of element 15. Along the rod 25 is
assembled and slides a second stop valve 26. Furthermore the rod 25 has a disk 25'
at its proximal end facing towards the first stop valve 24 and, in an intermediate part, a
stop shoulder 25" facing towards the second stop valve 26.
The first stop valve moves in the chamber 18 between a closed and an open
position of the valve housing 14, both together with the rod 25 and independently of
the latter. As regards to construction, the first stop valve 24 has, on one side, a seal
27 inserted to rest in contact with the input valve 14 housing to close it and, on the
other side, a cap base 28 with legs 28' - Fig. 7-. This cap is designed to rest with its
legs 28' on the lead-in neck 16 , when the first stop valve 24 is in the open position,
and on the end disk 25' of the rod 25 when said stop valve is kept closed on the valve
housing 14 and is moving from that position to the open position. The second stop
valve 26 can move along the rod 25 between a closed and open position of the gas
output lateral hole 22 towards the tank.
Between the cap 28 of the first stop valve 24 and the lead-in neck 16 of the
additional element 15 is assembled a first compressible spring 29 tending to push and
normally maintain the first stop valve in its closed position of the valve housing 14.
Between the second stop valve 26 and the bottom wall 20 of the additional
element 15 is positioned a second compressible spring 30. This spring tends to
maintain said second stop valve normally in the closed position of the lateral hole 22,

a position set by the stop valve resting against the shoulder 25" along the rod 25, and
at the same time pushing the rod 25 towards the first stop valve 24 with the end disk
25' of the rod 25 in contact with the cap 28 - Fig. 1,
A third compressible spring 30' is positioned between the second stop valve 26
and a collar 25a fixed to the rod 25 and tend to move the rod away from the first stop
valve 24, distancing the end disk 25' of one from the cap base 28 of the other.
Finally, a cam shaft 31 is mounted on the head 17 of the element 15, oriented
crosswise to the rod 25 which holds the stop valves 24, 26. The cam has a solid part
31' and a radial opening 31" on a same circumference and is connected to a rod of a
float or some other means of detection - not shown - which controls the level of the
fluid in the tank and which causes the rotation of the cam shaft 31, positioning the
solid part 31' or radial opening 31" towards the distal end of the rod 25 depending on
the level of the gas in the tank.
The springs 29, 30 and 30' are dimensioned and chosen so as to maintain the
first stop valve 24 in the closed position of the input valve 14 housing, the end disk of
the rod 25 resting against the base cap of the first stop valve 24 and the second stop
valve 26 in the closed position of gas output hole 22 to the tank, as shown in Fig. 1,
until the pressure of the gas in the input passage 12 of the valve body is sufficient to
prevail against the thrust of spring 29. In this condition, the solid part 31' of the cam
shaft 31 is facing towards the rod 25 and the latter is at a certain distance from the
cam shaft 31.
On refuelling the tank, the pressure of the liquid gas at input causes the first
stop valve 24 and the rod 25 move back together. The moving back of the first stop
valve 24 is limited by the feet 28' of its cap 28 resting against the lead-in 16 of the
additional element 15 and therefore causes the opening of the valve housing 14 as
shown in Fig. 2.


At the same time, the rod 25 moves and rests its distal end against the solid part 31'
of the cam shaft 31 and, by means of the pressure of the gas at input, causes a
backward movement 15 of the second stop valve 26 contrary to the action of the
springs 30, 30' associated with it and as far as the open position of the output hole 22
of the fluid towards the tank to load it when the distal end of the rod still rests against
the cam shaft 31.
The float follows the increase in level of the gas in the tank causing the cam
shaft 31 to turn. When the tank is 80% full as envisaged, the float has caused the cam
shaft 31 to turn so as to move its radial opening 31" in line with rod 25, which, no
longer having a place to rest, can move further back. Consequently, its end disk 25'
comes into contact with the lead-in neck 16, at a different level from the cap rest
position of the first stop valve, thus closing the duct 19 as shown in Fig. 3, and
stopping the flow of gas to the tank. The first stop valve 24, thrust by the relative
spring 29 moves into the closed position of the valve housing 14, interrupting the
delivery of gas to the tank.
Finally, once the supply means has been removed, the pressure differential
between the tank and chamber 18 and the concurrent action of the spring 29 cause
the first stop valve to return to the initial closed position, whereas springs 30 and 30'
push the second stop valve 26 against the shoulder 25", causing the rod 25 to return
to the rest position against the cap 28 as shown in Fig. 1, thanks to a radial bleeder
hole 126 on a level with the bell portion 126 of said rod.


WE CLAIM
1. A valve to control loading of a liquid gas from a tank, into gas powered
vehicles, comprising a valve body having a gas input passage (12)
connectable to a supply system and a branch, forming an input valve housing
(14) and to which is attached a correspondingly dimensioned element (15)
having an end head (17), wherein said correspondingly dimensioned element
forms an axial duct (19) having, on a first side, a lead-in neck (16) openable
towards the valve housing (14) through an intermediate chamber (18), on an
opposite side of the axial duct (19) a bottom wall with a central bore, and at
least one gas exit bore (22) laterally extending towards the tank, wherein the
end head of said element (15) accommodating a turning cam shaft (31)
connected to liquid level indicator in the tank, and wherein a first movable
stop valve (24) disposed in said chamber (18) being associated with the input
valve housing (14), said lateral exit bore (22) associated with a second stop
valve (26) movable in said axial duct (19), said stop valves (24,26) being held
by a guide rod (25) having a distal end that interacts with said cam shaft
(31), characterised by a first spring (29) associated with the first stop valve
(24) to hold the first stop valve (24) normally in a closed position in said
valve housing (14), and one each second and third springs (30, 30')
associated with the second stop valve (26) to hold the second stop valve (26)
normally in a closed position in respect of the lateral exit bore (22), said first,
second and third springs (29, 30, 30') are configured to allow a concurrent
movement of the first and second stop valves (24,26) to an open position for
the flow of the fluid to the tank due to the presence of a pressure at the


input of the valve body and to a closed position to automatically stop the flow
of the fluid to the tank upon attaining at least 80% load capacity in the tank
detected by a level detector.
2. The valve as claimed in claim 1, wherein said guide rod (25) has a proximal
end with a disk (25') facing towards the input valve housing (14) and an
intermediate shoulder (25"), in which a rod (24') of said first stop valve (24)
is guidable and slidable in a bell portion (125) of said rod (24') and which has
a seal (27) resting on the valve housing (14) and a base cap (28) resting on
an end disk (25") of said rod (24'), in which the first stop valve (24) moves
both together with the guide rod (25) and independently from the latter
between the closed position of the valve housing (14) and an open position in
which it rests against the lead-in neck (16) of the element (15), and in which,
said guide rod (25) moves in relation to the first stop valve (24) between a
rest position of its disk (25') against the base cap (28) of the first stop valve
(24) and a rest position on the lead-in neck (16) at a different level from the
rest position of the first stop valve (24).
3. The valve as claimed in claims 1 and 2, wherein the first spring (29) is
positioned between the lead-in neck (16) of the element (15) and the base
cap (28) of the first stop valve (24).
4. The valve as claimed in any of the preceding claims, wherein the base cap
(28) of the first stop valve (24) has legs (28') which rest on the lead-in neck
(16) when the first stop valve (24) is in the open position.


5. The valve as claimed in any of the preceding claims, wherein the intermediate
shoulder (25") along the guide rod (25) forms a rest, establishing the closed
position of the second stop valve (26) when the first stop valve (24) is in the
closed position, and wherein a second spring (30) and a third spring (30') are
associated with said second stop valve (26), tending to maintain it in said
closed position of the lateral exit bore (22) and such as to enable the
movement of said second stop valve (26) in the open position of said lateral
outlet bore (22) when the first stop valve (24) moves into the open position
of the valve housing (14), the movement of the second stop valve (26) from
the closed position to the open position being caused by a concurrent
movement of the guide rod (25) and the pressure of the fluid at input in
opposition to the action of the second and third spring (30,30').
6. The valve as claimed in claim 5, wherein the second spring (30) is positioned
between the second stop valve (26) and the bottom wall of the element (15)
and the third spring (30') is placed between the second stop valve (26) and a
collar fixed to the guide rod (25).
7. The valve as claimed in any of the preceding claims, wherein the first, the
second and the third spring (29, 30, 30') are calibrated differently and all
three springs are compressible/extendible concurrently in the same direction.
8. The valve as claimed in any of the preceding claims, wherein the lateral exit
bore (22) is substantially triangular in shape and incremental in size in the
direction of the opening movement of the second stop valve (26).

9. The valve as claimed in any of the preceding claims, wherein a plurality of
bleeder holes are configured in the bottom walls of the correspondingly
dimensioned element (15).


The invention relates to a valve to control loading of a liquid gas from a tank,
into gas powered vehicles, comprising a valve body having a gas input passage
(12) connectable to a supply system and a branch, forming an input valve
housing (14) and to which is attached a correspondingly dimensioned element
(15) having an end head (17), wherein said correspondingly dimensioned
element forms an axial duct (19) having, on a first side, a lead-in neck (16)
openable towards the valve housing (14) through an intermediate chamber (18),
on an opposite side of the axial duct (19) a bottom wall with a central bore, and
at least one gas exit bore (22) laterally extending towards the tank, wherein the
end head of said element (15) accommodating a turning cam shaft (31)
connected to liquid level indicator in the tank, and wherein a first movable stop
valve (24) disposed in said chamber (18) being associated with the input valve
housing (14), said lateral exit bore (22) associated with a second stop valve (26)
movable in said axial duct (19), said stop valves (24,26) being held by a guide
rod (25) having a distal end that interacts with said cam shaft (31), a first spring
(29) associated with the first stop valve (24) to hold the first stop valve (24)
normally in a closed position in said valve housing (14), and one each second
and third springs (30, 30') associated with the second stop valve (26) to hold the
second stop valve (26) normally in a closed position in respect of the lateral exit
bore (22), said first, second and third springs (29, 30, 30') are configured to

allow a concurrent movement of the first and second stop valves (24,26) to an
open position for the flow of the fluid to the tank due to the presence of a
pressure at the input of the valve body and to a closed position to automatically
stop the flow of the fluid to the tank upon attaining at least 80% load capacity in
the tank detected by a level detector.

Documents:

722-KOL-2004-ABSTRACT.pdf

722-KOL-2004-AMANDED CLAIMS.pdf

722-KOL-2004-CANCELLED PAGES.pdf

722-kol-2004-claims.pdf

722-KOL-2004-CORRESPONDENCE 1.1.pdf

722-KOL-2004-CORRESPONDENCE.pdf

722-kol-2004-correspondence1.2.pdf

722-KOL-2004-DESCRIPTION (COMPLETE).pdf

722-KOL-2004-DRAWINGS.pdf

722-kol-2004-examination report.pdf

722-KOL-2004-FORM 1.pdf

722-kol-2004-form 18.1.pdf

722-kol-2004-form 18.pdf

722-KOL-2004-FORM 2.pdf

722-kol-2004-form 26.pdf

722-kol-2004-form 3.1.pdf

722-KOL-2004-FORM 3.pdf

722-kol-2004-form 5.1.pdf

722-kol-2004-form 5.pdf

722-KOL-2004-FORM-27-1.pdf

722-KOL-2004-FORM-27.pdf

722-kol-2004-granted-abstract.pdf

722-kol-2004-granted-claims.pdf

722-kol-2004-granted-description (complete).pdf

722-kol-2004-granted-drawings.pdf

722-kol-2004-granted-form 1.pdf

722-kol-2004-granted-form 2.pdf

722-kol-2004-granted-specification.pdf

722-KOL-2004-OTHERS DOCUMENTS.pdf

722-kol-2004-others.pdf

722-KOL-2004-PA.pdf

722-KOL-2004-PETITION UNDER RULE 137.pdf

722-kol-2004-priority document.pdf

722-KOL-2004-REPLY TO EXAMINATION REPORT.pdf

722-kol-2004-reply to examination report1.1.pdf

722-kol-2004-specification.pdf

722-kol-2004-translated copy of priority document.pdf

722-kol-2004-translated copy of priority document1.1.pdf


Patent Number 248295
Indian Patent Application Number 722/KOL/2004
PG Journal Number 27/2011
Publication Date 08-Jul-2011
Grant Date 04-Jul-2011
Date of Filing 18-Nov-2004
Name of Patentee EMER S.R.L.
Applicant Address VIA ROMA 104/A, 25060 COLLEBEATO (BRESCIA)
Inventors:
# Inventor's Name Inventor's Address
1 GOBBI FRANCESCO VIA ROMA 104/A, 25060 COLLEBEATO (BRESCIA)
PCT International Classification Number B60K 15/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 BS2003U000070 2003-11-28 Italy