Valve for a tap of a compressed or liquified gas cylinder, and tap provided with such a valve
First Claim
1. Two-way valve for a tap of a gas cylinder, said valve being intended to be fitted on a selectively openable gas inlet/outlet passage of said tap, said two-way valve permitting both filling and discharging gas into and from the cylinder, respectively, and comprising a casing having a gas flow passage and at least one lateral opening formed in a casing wall;
- a piston means disposed in said casing and having a gas flow passage therethrough communicating with said casing passage, resiliently yieldable means for moving the piston means to a closed position wherein the opening is sealed off from said casing passage, and said piston means being movable by the pressure of the filling gas against the action of the resiliently yieldable means to an open position in which the lateral opening is in communication with the casing passage;
a level controlling valve movable between open and closed positions and, when in said open position, permitting gas to flow between the gas cylinder and the inlet/outlet passage through said casing and piston passages;
means for detecting the filling level in the gas cylinder and for actuating the level controlling valve in response to said level, said level controlling valve, when not held in an open position by said detecting means, being openable by the pressure of the gas in the cylinder when the inlet/outlet passage is open;
at least one vent orifice formed through said casing wall; and
seal means to block communication through said orifice between the casing passage and the environment surrounding the casing in the gas cylinder when the pressure in the casing passage is below a predetermined value and to establish such communication through said orifice when the pressure in the casing passage is above said predetermined value and while the piston means in the closed position, characterized in that said seal means is on said piston means and movable therewith and is in leak tight slideable engagement with an inner surface of said casing wall, said seal means being effective to block and establish communication between said vent orifice and the casing passage when the pressure in said passage is below and above said predetermined value, respectively, and while the piston means is in the closed position.
1 Assignment
0 Petitions
Accused Products
Abstract
A two-way valve is disclosed comprising at least two lateral openings which can be shut off by a piston provided with an axial orifice for the passage of gas, which piston slides axially in the casing between a position in which the openings are shut off under the influence of a spring and an open position counter to the action of the spring under the influence of the pressure of the filling gas, and a level valve activated by a float at the bottom of the casing. In order to prevent pressure from building up inside the casing after closure, the latter is provided with vent orifices. A seal member is arranged on the piston to cover or uncover the vent orifices.
29 Citations
24 Claims
-
1. Two-way valve for a tap of a gas cylinder, said valve being intended to be fitted on a selectively openable gas inlet/outlet passage of said tap, said two-way valve permitting both filling and discharging gas into and from the cylinder, respectively, and comprising a casing having a gas flow passage and at least one lateral opening formed in a casing wall;
- a piston means disposed in said casing and having a gas flow passage therethrough communicating with said casing passage, resiliently yieldable means for moving the piston means to a closed position wherein the opening is sealed off from said casing passage, and said piston means being movable by the pressure of the filling gas against the action of the resiliently yieldable means to an open position in which the lateral opening is in communication with the casing passage;
a level controlling valve movable between open and closed positions and, when in said open position, permitting gas to flow between the gas cylinder and the inlet/outlet passage through said casing and piston passages;
means for detecting the filling level in the gas cylinder and for actuating the level controlling valve in response to said level, said level controlling valve, when not held in an open position by said detecting means, being openable by the pressure of the gas in the cylinder when the inlet/outlet passage is open;
at least one vent orifice formed through said casing wall; and
seal means to block communication through said orifice between the casing passage and the environment surrounding the casing in the gas cylinder when the pressure in the casing passage is below a predetermined value and to establish such communication through said orifice when the pressure in the casing passage is above said predetermined value and while the piston means in the closed position, characterized in that said seal means is on said piston means and movable therewith and is in leak tight slideable engagement with an inner surface of said casing wall, said seal means being effective to block and establish communication between said vent orifice and the casing passage when the pressure in said passage is below and above said predetermined value, respectively, and while the piston means is in the closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a piston means disposed in said casing and having a gas flow passage therethrough communicating with said casing passage, resiliently yieldable means for moving the piston means to a closed position wherein the opening is sealed off from said casing passage, and said piston means being movable by the pressure of the filling gas against the action of the resiliently yieldable means to an open position in which the lateral opening is in communication with the casing passage;
-
13. Gas tap comprising a tap body designed to be fitted on a gas cylinder and having an inlet/outlet passage, a closure member for opening and closing said channel, means for manoeuvring the closure member, a safety valve, and a two-way valve communicating with said channel to permit both filling and discharging gas into and from the cylinder, respectively, said valve comprising a casing with at least one lateral opening formed in a casing wall;
- a piston means disposed in said casing and having a gas flow passage therethrough communicating with said casing passage, resiliently yieldable means for moving the piston means to a closed position wherein the opening is sealed off from said casing passage, and said piston means being movable by the pressure of the filling gas against the action of the resiliently yieldable means to an open position in which the lateral opening is in communication with the casing passage;
a level controlling valve movable between open and closed positions and, when in said open position, permitting gas to flow between the gas cylinder and the inlet/outlet passage through said casing and piston passages;
means for detecting the filling level in the gas cylinder and for actuating the level controlling valve in response to said level, said level controlling valve, when not held in an open position by said detecting means, being openable by the pressure of the gas in the cylinder when the inlet/outlet passage is open;
at least one vent orifice formed through said casing wall; and
seal means to block communication through said orifice between the casing passage and the environment surrounding the casing in the gas cylinder when the pressure in the casing passage is below a predetermined value and to establish such communication through said orifice when the pressure in the casing passage is above said predetermined value and while the piston means in the closed position, characterized in that said seal means is on said piston means and movable therewith and is in leak tight slideable engagement with an inner surface of said casing wall, said seal means being effective to block and establish communication between said vent orifice and the casing passage when the pressure in said passage is below and above said predetermined value, respectively, and while the piston means is in the closed position. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- a piston means disposed in said casing and having a gas flow passage therethrough communicating with said casing passage, resiliently yieldable means for moving the piston means to a closed position wherein the opening is sealed off from said casing passage, and said piston means being movable by the pressure of the filling gas against the action of the resiliently yieldable means to an open position in which the lateral opening is in communication with the casing passage;
Specification