Abstract: A non-lethal rifle that may include a chamber, a barrel, a gas flow controller that is configured to release, following a trigger, a controllable amount of gas into the chamber; wherein the controllable amount of gas is determined based on, at least, information regarding a target; and an ignition unit that is configured to ignite the gas within a chamber thereby causing a controlled explosion that propels a non-lethal projectile through the chamber, the barrel and towards the target.

Abstract: A method can include providing an object having a size smaller than a size of a known regulation object, projecting the object, via a delivery device, toward a trainee, and training the trainee to follow the object. A method can include determining a game parameter of a game trajectory of a sports object that was projected along the game trajectory in a real-time sports event, and based on the game parameters, adapting a delivery device to deliver a training object along a training trajectory that mimics at least a portion of the game trajectory, with the training object being smaller than the sports object.

Abstract: A puncture mechanism that is configured to puncture a seal provided over a mouth of a canister of compressed gas received within a less-lethal device to propel a projectile from the less-lethal device when a trigger mechanism of the less-lethal device is actuated by a user. The puncture mechanism includes a displaceable body that has a piercing mechanism which is configured to pierce the seal provided over a mouth of the canister. The puncture mechanism further includes an actuation arrangement, which comprises a trigger mechanism, for displacing the displaceable body towards the canister whereby the piercing mechanism pierces a seal of the canister and compressed gas flows into a barrel of the less-lethal device to propel the projectile from the less-lethal device.

Abstract: A pneumatic ball launcher includes a tube, a ball pathway unit, a push unit, a holding unit, an airway unit and a pneumatic unit. The ball pathway unit is used for connecting one end of the tube and wrapping part of a ball channel of the tube. The push unit includes a push bar, a slide base, a first driver and a second driver. The holding unit, detachably connected with the push unit, is used for holding the ball pushed by the push bar. The airway unit is connected with the holding unit. The pneumatic unit includes a valve mechanism, a pneumatic cylinder and a gas tank. When the valve mechanism opens to allow the gas tank to discharge into the holding unit via the airway unit, the ball held by the holding unit would be ejected out of the tube.

Abstract: A firing system using a gas piston instead of a trigger spring provides firing by air that is released after contacting an air outlet valve needle in pre-charged pneumatic (PCP) rifles. This system results in a high outlet speed as well as rapid fire by use of a lever that limits the single release of air into the tube.

Abstract: The no-bullet no-firing structure of the toy gun is disclosed. The toy gun has an impact unit and the no-bullet no-firing structure. The structure has a barrel component, a switch unit and a magazine unit. The switch unit has a pull lever with an abut lever, an elastic member with an elastic arm, and a push member. The magazine unit has a magazine, a bullet and a pulled member. The pulled member is pushed by the bullet to push the abut lever to make the pull lever, the push member and the impact unit be aligned on a same linear line. When no bullet is in the magazine, the abut lever is pushed by the elastic arm to rotate the pull lever pivotally, and the pull lever drives the push member to swing to make the toy gun be unable to fire.

Abstract: A mechanical pneumatic valve system of a paintball gun is disclosed herein. It comprises a trigger activated valve body, a firing control valve body connected at a top of the trigger activated valve body, a firing control piston disposed in the firing control valve body, a push pilot piston positioned at a posterior end of the firing control piston and having a diameter greater than a diameter of the firing control piston, a dump chamber air reservoir communicated with the trigger activated valve body and having a volume adjustable piston to increase or decrease a volume of the dump chamber air reservoir, and a dump chamber control valve piston housed in the trigger activated valve body.

Abstract: A ball launching apparatus is provided. The apparatus includes a funnel residing at an upper end of a housing. The funnel includes a channel for gravitationally directing a ball into a launch point within an interior compartment of the housing. The apparatus includes a hammer that strikes a ball through a chute, thereby releasing the ball from the housing. Both the distance at which the ball travels and the angle at which the ball leaves the chute may be adjusted by the operator. A method of exercising a dog is also provided herein.

Abstract: The valve comprises a housing defining a cavity having a side wall, a ceiling and an open end, a plunge slidable within the cavity, a control device for causing the plunge movement. The cavity has at least one slot on the side wall.

Abstract: The present invention is directed toward an adapter for launching smaller sized sonobuoys from a standard size sonobuoy launching container. The adapters enable two smaller sized sonobuoys to be disposed within the standard size sonobuoy launching container in series. The adapter includes a diverter mechanism that is configured to launch a first smaller sized sonobuoy when the sonobuoy launching container receives a first burst of air, and launch a second smaller sized sonobuoy when the sonobuoy launching container receives a subsequent second burst of air.

Abstract: The present invention is directed toward an adapter for launching miniature sonobuoys from a standard sized sonobuoy launching container. The adapter includes a first cylindrical member, a second cylindrical member, and a diverter member, and is disposed within the container. The first member includes a central passage that retains a first miniature sonobuoy. The second member includes a central passage retains a second miniature sonobuoy. The second member further includes at least one channel that extends through the sidewall of the second member. The diverter member is in fluid communication with the at least one channel and the central passage of the second member. The diverter is configured to divert a first burst of air along the at least one channel to launch the first miniature sonobuoy and divert a second burst of air along the central passage of the second cylindrical member to launch the second miniature sonobuoy.

Abstract: A football throwing apparatus is described that utilizes air pressure to throw a football in a conventional spiral manner. How far the football can be thrown can be adjusted by an air pressure control. The football may be thrown immediately upon pressing a button, or it may be thrown after a predetermined period of time after the operation of a switch. The football throwing apparatus is initially charged with pressurized air in a first area and a second area. The button or switch causes the pressurized air in the first area to be immediately vented which creates a vacuum due to the pressurized air in the second area. The vacuum actuates a mechanical linkage that causes the pressurized air stored in the second area to be released and throw the football.

Abstract: Provided is a flow regulating apparatus 100 including a flow regulating mechanism including: a flow regulation knob 3; a screw rod 10 that adjusts an insertion amount of a diaphragm needle 5 into a valve hole 32; and a spring roll pin 13 that is fixed to the flow regulation knob 3, wherein the screw rod 10 includes a first male threaded portion that is fastened to a female threaded portion 9a formed on an inner circumferential surface of a cover section 9, and a through hole 10d penetrating in the direction substantially perpendicular to the center axis C and having a predetermined width in the direction of the center axis C, and the spring roll pin 13 is inserted into the through hole 10d.

Abstract: In one embodiment, a striking apparatus of a paintball gun is provided. The striking apparatus is received in a receiving chamber of a gun body. The gun body has a screw-jointing hole for being screwed and fixed to the striking apparatus. The striking apparatus includes a sleeve, a striking unit, a valve, and a pressure adjuster. The striking unit and the valve are received in the sleeve in sequence, and then the pressure adjuster is screwed to the sleeve. Being a unitary structure, the striking apparatus can be separated from the gun body completely and directly, and thus is easy to disassemble, maintain, and assemble.

Abstract: A pneumatic assembly for a paintball gun is provided. The pneumatic assembly includes a valve stem, and a bolt slidably mounted on the valve stem. The bolt includes at least one bolt port arranged through a sidewall of the bolt. A sealing member is provided on the valve stem in communication with an inner surface of the bolt. The bolt slides from a rearward position to a forward position along the valve stem. Compressed gas flows through the bolt port and through the bolt aperture to fire a projectile when the bolt is in the forward position. A paintball gun incorporating the pneumatic assembly is also provided.

Abstract: A projectile launcher capable of optionally repositioning the bolt to a predefined position using a bolt carrier is disclosed. The launcher, in one aspect, includes a bolt, a striker, a bolt carrier, and a ramp. The bolt, in one example, is configured to be able to move within a bolt chamber. The striker having a striker reset hook is able to move in a direction parallel to a moving direction of the bolt. The bolt carrier, having a fastener, a flexible latch, and a bolt repositioning latch, is attached to the bolt via the fastener. The flexible latch is able to latch to the striker reset hook for resetting the striker during a process of launching a projectile. The ramp facilitates disconnecting the flexible latch from the striker reset hook when the flexible latch moves over the ramp.

Abstract: A pneumatically timed control unit controls a gas operated projectile launching device. At rest, the control unit feeds pneumatic gas from a compressed gas supply to the launching device's loading, launching components and/or mechanisms, and/or gas storage chamber(s). Once the valve is partially activated, the control unit uses pneumatic pressure from the gas storage device to urge the valve to a fully activated position to start the launching and/or loading sequences of the launching device and to pneumatically hold the valve(s) within the control unit in the activated position. The control unit waits for pneumatic feedback and/or absence of feedback/exhausting pneumatic pressure from either the launching device's loading and/or launching components and/or mechanism, or from a gas storage chamber and/or a venting relief-type valve to release the pneumatic hold on the valve. This allows the valve to be shifted to the “at rest” position, ready for the next activation sequence.

Abstract: An improved paintball gun uses a low-pressure pneumatic sear to hold the firing valve closed against the high pressure gas occupying the other side of the valve. In this manner, only one operation is required between depressing the trigger and the firing of the paintball gun because a double-acting cylinder is not required as an interface between the trigger depression and actuation of the valve. The paintball gun is also substantially faster than existing electro-pneumatic paintball guns because it uses a blow forward bolt, in which higher-pressure gas is held directly behind the bolt and has only one direction to travel during the firing of the paintball gun.

Abstract: A paintball marker has an inline cylinder that includes a gas governor that reduces gas flow from a compressed gas source to a valve area when the bolt is in a firing position; this increases efficiency in the marker because only the required air is used to fire the paintball. This bolt operates independent of the valve pin, which increases cycle speed and enables the governor to open and close at an optimum time in the firing cycle. Further, when the bolt/piston is recocking, the gap between the valve pin and governor valve pin enables low pressure gas driving the piston to start pressurizing the cylinder and driving the piston rearwards without resistance from the high pressure gas. The marker also allows a user to remove the inline cylinder without tools, and provides a convenient carrying handle for holding the paintball marker, which is commonly called a “snatch grip.

Abstract: A blowback assembly for an airgun includes a valve body and a valve stem disposed within and movable with respect to the valve body. The valve stem has a stepped outer profile and the valve body defines a passageway having a stepped inner profile. The valve stem is normally biased against the valve body to form a seal containing a compressed gas in a valve stem chamber forming part of the passageway of the valve body. When the valve stem is moved from the normal position, compressed gas is expelled from the valve stem chamber to cock the airgun and to fire a projectile from the airgun.

Abstract: A compressed gas-powered projectile accelerator is disclosed having an improved means of gas distribution, a valve locking mechanism, an improved combined bumper/seal, and self-contained modular components to improve efficiency, manufacturability, and reduce size and weight.

Abstract: Embodiments of the present disclosure include an apparatus including a tank for pneumatic gun comprising a fluid outlet, including an adapter that includes a first end attached to the tank, a second end comprising a fitting, wherein the fitting is capable of receiving a fluid hose, wherein the fluid hose is connected to a source of compressed fluid. The apparatus allows the gun to be fired from the source of compressed fluid. Other embodiments include a method of connecting the apparatus to a pneumatic gun, attaching the fluid hose to the fitting, and firing the gun.

Abstract: A compressed gas-powered projectile accelerator is disclosed having an improved means of gas distribution, a valve locking mechanism, an improved combined bumper/seal, and self-contained modular components to improve efficiency, manufacturability, and reduce size and weight.

Abstract: The proposed invention is a new bolt and gas release valve mechanism for a projectile launching device, such as a paintball marker, that uses significantly less gas per shot than prior art devices. The open gas chamber between the projectile, such as a paintball, and the gas release mechanism is eliminated thereby requiring much less gas to be used for each launch of a given projectile. Thus, only the launching gas to propel the projectile is needed and not the additional gas required to fill the chamber in the bolt directly behind the projectile. This enables desirably smaller gas supply tanks to be used during use to launch the same number of projectiles. Also, with the present invention, more projectiles can be launched using the same gas supply tank.

Abstract: An improved paintball gun uses a low-pressure pneumatic sear to hold the firing valve closed against the high pressure gas occupying the other side of the valve. In this manner, only one operation is required between depressing the trigger and the firing of the paintball gun because a double-acting cylinder is not required as an interface between the trigger depression and actuation of the valve. The paintball gun is also substantially faster than existing electro-pneumatic paintball guns because it uses a blow forward bolt, in which higher-pressure gas is held directly behind the bolt and has only one direction to travel during the firing of the paintball gun.

Abstract: A launcher for heat exchanger tube cleaning projectiles using operator selected compressed air application for manipulating launcher operating components including hydraulic bolt, projectile plunger, and water valve to fire projectile with pressurized water, and to reset operating components for subsequent projectile firings. Launcher has means for venting heat exchanger tube over- or under-pressure occurring in practice, and further has visual indicator of force applied in firing projectiles, and of tube being clear after exiting of projectile from the tube.

Abstract: According to the present invention, by providing an extremely simple member such as a partition wall having a microscopic hole section, it is possible to reliably reduce the speed of a bullet to within a fixed speed, even a complicated decompression device such as a regulator is not provided. As a result, manufacturing time for the air gun is shortened, it is possible to lower manufacturing cost, and there is the effect of improving the manufacturing efficiency.

Abstract: A paintball marker has an inline cylinder that includes a gas governor that reduces gas flow from a compressed gas source to a valve area when the bolt is in a firing position; this increases efficiency in the marker because only the required air is used to fire the paintball. This bolt operates independent of the valve pin, which increases cycle speed and enables the governor to open and close at an optimum time in the firing cycle. Further, when the bolt/piston is recocking, the gap between the valve pin and governor valve pin enables low pressure gas driving the piston to start pressurizing the cylinder and driving the piston rearwards without resistance from the high pressure gas. The marker also allows a user to remove the inline cylinder without tools, and provides a convenient carrying handle for holding the paintball marker, which is commonly called a “snatch grip.

Abstract: A trigger sear is placed between a trigger and a bolt sear. The engagement between the bolt sear and a bolt is removed by pulling the trigger. The bolt makes reciprocating motion in the back and forth direction of the toy gun. While it reciprocates once, the bolt opens and closes a valve portion and fires off a bullet B. When the trigger is pulled, a stopper pawl and a driving pawl are engaged with a control plate having a ratchet gear structure. In conjunction with the reciprocating motion of the bolt, the driving pawl rotates and displaces the control plate in a forward direction. When the toy gun fires a predetermined number of bullets B, a sear bar is displaced. The sear bar moves the trigger sear and causes it to break away from the bolt sear.

Abstract: A projectile launcher having a pneumatic assembly that reduces recoil. The launcher may include a gas storage chamber that is filled with compressed gas and then selectively vented to propel projectiles. In some cases, an electronic control circuit may be provided to selectively vent the gas storage chamber. In some embodiments, the launcher may include an anti jam feature that reduces breakage of projectiles during firing.

Abstract: A paintball gun comprises: a body defining a gas storage chamber for connection to a source of pressurized gas, a breech into which paintballs can be loaded, and a hammer chamber; a bolt slidable in the breech and having a bolt inlet port; a hammer slidable in the hammer chamber and connected to the bolt; and a poppet valve comprising a valve body defining a valve inlet connected to the storage chamber, a valve outlet connected to the breech, and a blow back port connecting the inlet to the hammer chamber, and a valve member slidable in the valve body and movable between an open position, in which it allows gas to flow from the storage chamber through the valve inlet to the valve outlet, and a closed position in which it closes the valve, and a pair of magnets arranged to bias the poppet towards the closed position.

Abstract: This specification discloses a structure of the paintball gun. It comprises a body, a pressuring set, and a triggering set. The body has an axial passage whose front end forms a paintball outlet. The triggering set and the pressuring set are disposed in sequence inside the passage. The triggering set has a bushing, a guide pillar, and a bolt. The bushing is fixed inside the passage. The bolt is mounted on the guide pillar and disposed together inside the bushing. Air after being pressurized by the pressing set enters the triggering set. A control valve controls the flow path of the air in the triggering set in order to push the guide pillar backward. The air thus pushes the bolt toward the paintball outlet of the passage for triggering.

Abstract: An apparatus for firing a non-lethal projectile comprises a body with an internal cavity. A light source may be disposed in the cavity to illuminate an area outside the body. A firing mechanism may also be provided to cause a projectile to be propelled through the body.

Abstract: A paintball gun system comprises a bolt defining a propellant passageway and a gun body defining the following elements: a receptacle for receiving the bolt, a firing charge storage chamber adjacent to but separate from the bolt receptacle, a gas inlet port, a first passageway between the storage chamber and the receptacle, a second fixed passageway between the gas inlet and the receptacle. The first passageway communicates with a first flow opening into the receptacle and the second passageway communicates with a second flow opening into the receptacle. The bolt is axially movable between a chargeup position and a firing position. In the chargeup position, the bolt and the body together define a confined flow circuit between the first opening and the storage chamber. In the firing position, the bolt and the body together define a confined flow circuit between the storage chamber and the discharge inlet.

Abstract: A pneumatic gun with easily removable bolt. A bolt is coupled to a bolt pin to be introduced into the rear of a receiver of the pneumatic gun. The striker defines a notch to receive the bolt pin the notch is open ended towards the rear of the gun. A cap is coupled to the striker so that it can rotate between an open orientation and a closed orientation. In the open orientation, the cap defines a slot that aligns with the notch of the striker to permit the bolt pin to enter the notch and the closed orientation of the cap captures the striker within the notch so that the striker and bolt move as a unit.

Abstract: A firing assembly of a paintball gun includes a piston, a spring, and a valve installed in a chamber in a frame of the paintball gun. The piston is a bar-like member having front member, a connection member, and a rear member. The connection member is smaller than the front member and the rear member to form a space thereunder. The valve is in the space to divide the space into a front room and a rear room. The spring urges the piston forward to have the rear member pressing an actuator of the valve that a high pressure gas will escape out of the valve to spurt out of the apertures via the rear room, the channels, and the front room. The high pressure also pressurizes the rear member to move the piston backward and compress the spring.

Abstract: The present utility model relates to a gas air operated with draw back boring toy long-barrelled gun. Its firing module, ammunition box module and trigger module are installed in the main body of the gun, wherein a rifle bolt main body is provided inside the firing module, and there is a connecting rod, a piston module and a rifle bolt gearing component provided inside the rifle bolt main body. Through the trigger module, and the connecting rod, the piston module and the rifle bolt gearing component provided inside the rifle bolt main body, its trigger module produces gas air fire, and makes the firing module produces gas air draw back and automatic loading. It enables the firing module to draw back and loading automatically, and allows the gun to fire continuously.

Abstract: The present invention relates generally to a toy water gun and, more particularly, to a pressurized toy water gun having a mixing nozzle or nozzles for simultaneously discharging and mixing two or more liquids after they pass through the mixing nozzle. In one embodiment, the toy gun may include separate tanks or reservoirs for storing the liquids, and separate nozzles for receiving and discharging the liquids in discharged streams of liquid. The toy gun may further include a pressurization mechanism in fluid communication with the tanks and the nozzles to provide pressure to cause the liquids to be discharged from the nozzles in the discharged streams of liquid. The nozzles may be oriented relative to each other such that the discharged streams engage each other after being discharged from the outlets of the nozzles to mix the liquids.

Abstract: A firing mechanism for a paintball gun is received in the path of the barrel and a trigger is used to activate the firing mechanism. The firing mechanism includes a driving member, a switch member, a control member and an inner part, all of which are received in the path of the barrel. The driving member drives the switch member to change the air flow in the marker so as to move the control member axially to control the high pressurized air to move the inner part such that the high pressurized air is released to eject the paintballs out from the barrel.

Abstract: An air-compressed bullet gun assembly with a length-reduced gun barrel is provided, including a barrel body, a bullet-firing device, a blocking element and a rear cover. The barrel body includes a hollow tube which further includes a 1st blocking flange and a 2nd blocking flange; the 2nd blocking flange divides the hollow tube into two connected parts: the 1st air chamber and the 2nd air chamber; the 1st air chamber includes a screw hole. The bullet firing device includes a 1st protruding flange, a 1st air-tight loop, a 2nd air-tight loop, a plurality of ventilators, and a guiding pole. The blocking element includes a locking hole, a 2nd protruding flange, and a 3rd air-tight loop. The rear cover includes a 5th air-tight loop.

Abstract: The present invention is an improved grenade which launches a plurality of pellet projectiles. The grenade includes a housing containing at least one spiral launch tube, said launch tube having a breech end and a muzzle end. A plurality of projectiles are loaded in the launch tube between the breech and muzzle ends. The grenade includes a gas reservoir for storing a compressed gas coupled to the breech end of the launch tube. A valve is interposed between the reservoir and the breech end of the launch tube for controlling the flow of compressed gas from the reservoir to the breech end of the launch tube. The valve is moveable between a closed state and an open state wherein said compressed gas enters the breech end of the launch tube to propel the projectiles from the muzzle end, the valve being biased towards its open state.

Abstract: An improved two-stage light gas gun for launching projectiles at high speeds. The gun consists of three tubes: the expansion, pump, and launch tubes. The expansion tube contains a close-fitting expansion piston that is propelled by an explosive charge. The expansion piston in turn drives the pump piston housed within the pump tube by means of a rod connecting the two pistons. The action of the pump piston adiabatically compresses and heats a light gas of hydrogen or helium, bursting a diaphragm at a predetermined pressure and expelling the projectile from the launch tube at a very high speed.

Abstract: A paintball gun which is simplified in structure and improved in gas efficiency comprises a two-stage pneumatic propulsion, a rear end of the paintball feeder is engaged in an inner groove of the pushing rod, such arrangements facilitates smooth flow of the gas in the barrel of the paintball gun and simplification of the structure.

Abstract: A paintball gun includes an air valve and a body portion, in which the body portion includes a paintball hole, a communicator, a piston, an axle sleeve and a bolt. By the pneumatic control of the air valve, the piston is pushed between the first and second positions, and the movement of the bolt is, therefore, controlled between the third and fourth positions, so as to selectively turn the effusion passage open or closed to control the pneumatic air to flow out of the projection passage and projection hole to project the paintball.

Abstract: A paint ball gun includes a frame defining a frame bore therein and a valve located below the frame. The valve communicates with a first path which communicates with the barrel. A bolt and a strike rod are received in the frame bore. The valve guides pressurized air to the rear end of the strike rod to move the strike rod to push the bolt which has a central passage. When shooting, the central passage opened and the pressurized air flows through the central passage to eject paint balls.

Abstract: The tubular bolt of a paintball gun communicates with a cylinder through bores when in a forward, firing position, allowing compressed gas from the cylinder to expel a paintball. In accordance with the invention a bore whereby the cylinder communicates with a source of compressed gas is occluded by the bolt when the bolt is in the firing position. By this arrangement only gas stored in the cylinder is used to fire a paintball and the source of compressed gas is not in communication with the cylinder except when the trigger is released and the bolt is in its retracted position.

Abstract: A paintball marker for launching a paintball using a bolt with an internal impact ring for contacting a power tube sized to fit within the bolt. The power tube has an internal gas passage for supplying launching gas to the paintball and an external striking surface that is contacted by the bolt's impact ring. A main seal is positioned selectively seal the internal passage of the power tube from a gas supply. Movement of the bolt causes the impact ring to contact the striking surface to unseat the power tube from the main seal to release gas from the main gas chamber through the internal passage into the breach to launch the paintball.

Abstract: A gun preferably designed to rapidly fire paint balls includes a single valve assembly that is inserted into and removed from the gun body. The valve assembly includes a low pressure ram passing through a longitudinal center or core of the assembly, and is capable of being driven in opposite reciprocal directions. A volumizer stores a charge of high pressure gas sufficient to adequately propel a paint ball, and a high pressure poppet valve is driven by movement of the low pressure ram for releasing the charge rapidly. A bolt carried upon the low pressure ram moves a paint ball into firing position just prior to the high pressure discharge. All of the aforementioned components of the cartridge are carried upon a single axis defined by the ram. Means are provided to both align and couple the various components together to ensure proper operation at high firing rates.

Abstract: A valve for paint ball guns includes a case for receiving a first piston rod therein in which a first end of a second piston rod is movably received. The case includes several chambers defined therein so as to introduce pressurized air into the barrel of the paint ball gun. The first piston rod includes two piston rings and one of which is larger than the other. The first piston rod is biased by a first spring. The first end of the second piston rod in the first piston rod is biased by a second spring which is easily overcome by pushing the second piston rod by a driving member. The movement of the second piston rod introduces pressurized air to apply to the piston ring of larger area to generate a force to overcome the force from the first spring and the piston ring of the smaller area.

Abstract: A self-regulating valve assembly for a compressed gas gun includes a valve housing and a valve body disposed within the valve housing. The rearward end of the valve body defined an outlet port. The forward end of the valve body defines a gas balance reservoir open to and in communication with the breech of the gun. A valve gas passage is provided between the valve body and the valve housing, the valve gas passage providing communication between the outlet port of the valve body and the gas balance reservoir of the valve body. A slidable valve poppet is disposed within the valve body and includes a sensing end adjacent to and at least partially within the gas balance reservoir, the sensing end having a sensing face adapted to react to gas pressure within the gas balance reservoir. The valve poppet is slidable between a closed position and an open position. A valve spring within the valve body biases the valve poppet toward the closed position.