A gas valve has housing and a barrier. The housing has a passageway with an upstream port and a downstream port. The barrier is disposed across the passageway and is formed from a material which is porous to compressed gas but which substantially prevents a low-pressure liquid from advancing through the passageway downstream of the barrier. The passageway may also contain a gas conditioner and/or a filter that is preferably disposed downstream of the barrier. In another embodiment, a valve comprises an inlet opening, a passageway extending downstream of the inlet opening, an attachment portion near the inlet opening, and a movable cap adapted to cover the inlet opening. The cap has a range of motion between a first position, wherein the cap covers the inlet opening, and a second position outside of the passageway, wherein the cap is displaced from the inlet opening. The cap is biased towards the first position. The gas valve may further comprise a gas regulator in fluid communication with the passageway.
1. A regulator device configured to reduce the gas pressure of a source of pressurized breathable gas in a self contained underwater breathing apparatus, comprising:
a regulator housing;
a gas inlet opening located within a bore in the regulator housing;
a gas valve, comprising:
a housing possessing an inlet opening and an exit opening;
a passageway extending downstream of the inlet opening;
a filter located within the passageway and proximate the exit opening and distal the inlet opening so that fluid must pass through the filter to pass through the exit opening; and
a retainer device for removably securing the filter within the exit opening of the passageway; and
a moveable cover member adapted to cover the inlet opening of the gas valve, the moveable cover member having a range of motion between a first position wherein the moveable cover member covers the inlet opening and a second position outside of the passageway wherein the moveable cover member is displaced from the inlet opening, the moveable cover member being biased towards the first position;
wherein the housing of the gas valve includes a portion threaded into the bore of the regulator housing;
wherein the exit opening of the gas valve is in fluid communication with the gas inlet opening of the regulator housing;
wherein the moveable cover member is adapted to move from the first position to the second position when the valve is attached to a source of compressed gas; and
wherein the moveable cover member is adapted to automatically move from the second position to the first position when the valve is disconnected from a source of compressed gas.
2. The valve of claim 1 further comprising a biasing element biasing the moveable cover member to the first position and being attached to the housing and being adjacent to the inlet opening.
3. The valve of claim 2 further comprising a screw member threadably connected to the housing and attached to a hand knob, the screw member being in contact with the moveable cover member in the first position to apply a linearly force and the biasing member continuously biasing the moveable cover member towards the first position.
4. The valve of claim 1 further comprising a biasing element continuously biasing the moveable cover member to the first position and being in continuous contact with the movable cover member.
5. The valve of claim 4 wherein the biasing element comprises a spring hinge attached to an arm coupling the movable cover member to an attachment member.
6. The valve of claim 4 wherein the biasing element comprises a resilient arm attached to the movable cover member.
7. The valve of claim 6 wherein the resilient arm is in a low stress condition with the movable cover member being in the first position and being in a high stress condition with the movable cover member being in the second position.
8. A regulator device configured to reduce the gas pressure of a source of pressurized breathable gas in a self contained underwater breathing apparatus, comprising:
a regulator housing;
a gas inlet opening located within a bore in the regulator housing;
a gas valve, comprising:
a housing possessing an inlet opening and an exit opening;
a passageway extending downstream of the inlet opening;
a filter located within the passageway proximate the exit opening and distal the inlet opening so that fluid must pass through the filter to pass through the exit opening; and
a retainer device for removably securing the filter within the exit opening of the passageway; and
a moveable cover member adapted to cover the inlet opening of the gas valve, the moveable cover member having a range of motion between a first position wherein the moveable cover member covers the inlet opening and a second position outside of the passageway wherein the moveable cover member is displaced from the inlet opening, the moveable cover member being biased towards the first position;
wherein the housing of the gas valve includes a portion threaded into the bore of the regulator housing;
wherein the exit opening of the gas valve is in fluid communication with the gas inlet opening of the regulator housing;
wherein the moveable cover member is adapted to move from the first position to the second position when the valve is attached to a source of compressed gas; and
wherein the moveable cover member is adapted to automatically move from the second position to the first position when the valve is disconnected from a source of compressed gas;
further comprising a screw member threadably connected to the housing and attached to a hand knob, the screw member being distal from the moveable cover member with the moveable cover member being in and biased into the first position.