Abstract: A sprayer boom on a vehicle serves for by means of a number of liquid nozzles spraying a carriageway with a liquid fed under pressure to the nozzles from a storage container via a feed pipe. The nozzles are divided into sets with each their valve arrangement for selectively shutting off and opening for liquid supply to the respective set. The sprayer boom is suitable for tasks where the same amount of liquid per area unit must be sprayed across the area the vehicle passes irrespective of the speed of the vehicle, in as much as the nozzle sets can be regulated quickly and easily to optimum functioning at a given speed and a corresponding liquid flow.

Abstract: An injector is disclosed, in which the change in the internal pressure of each chamber is relaxed when a pressure application mechanism is reciprocating thereby to lengthen the service life of the component parts including a diaphragm portion.

Abstract: A water jet is disclosed having a tank which forms a reservoir containing a liquid, such as water. An elongated conduit has one end fluidly connected to the reservoir while a nozzle is connected to the other end of the conduit. This nozzle, furthermore, has an opening with a cross-sectional area less than the cross-sectional area of the conduit. A valve is connected in series between the conduit and the reservoir, and this valve is movable between an open and a closed position. The reservoir is pressurized to a pressure in the range of 30-300 psi so that, once the valve is opened, water flows through the conduit and out through the nozzle at a high pressure and high speed water jet. This water jet can be used, inter alia, to clean industrial parts, such as engine blocks.

Abstract: A self-contained thermo-mechanically self-opening steam head that is normally generally flush with a supporting steam room wall when not in use so as not to pose a safety hazard. The steam head has a mechanical thermostat that automatically responds to the presence of heat as from steam to move a deflector plate, which normally generally blocks a steam outlet from the head, to an open position. That open position is spaced from but closely in front of the steam outlet. This allows steam to flow out of the outlet, but the deflector plate diverts the outward steam flow to a direction generally along the supporting wall. When the steam is shut off, the thermostat cools and thereby causes the deflector plate to return to its closed, blocking position. There is no electrical wiring or connection which could pose a major safety hazard in the presence of water.

Abstract: A sprinkler head assembly comprised of a base located at the upper end of a riser tube and which base carries a screen allowing for distribution of water. In accordance with the present invention, a control valve is located directly at the sprinkler head assembly. In one embodiment, the sprinkler head assembly may constitute a shrub or stationary head connected to the upper end of the riser tube. In this embodiment, the control valve would be preferably located in the body of the base of the stationary sprinkler head. In another embodiment, the sprinkler head assembly constitutes a pop-up sprinkler head and the control valve would be located in the pop-up shaft forming part of that sprinkler head. In still another embodiment of the invention, a retrofit coupling or adapter may be provided and which would be located between a riser tube and a sprinkler head forming part of that assembly. In this case, the adaptive coupling would include the control valve.

Abstract: A microdispensing system is useful for the open-jet dispensing of liquids. A valve having a valve chamber is bounded by an impermeable elastic membrane and is filled with the liquid for dispensing. One or more liquid supply lines lead to the valve chamber. An outlet closed from the exterior by the membrane in the position of rest leads from the chamber to a dispensing nozzle. An actuator chamber is disposed on the other side of the membrane. In the actuator chamber, an electromechanical drive is connected to the membrane for the purpose of briefly lifting the membrane from the outlet. The actuator chamber is closed in such manner that it can be subjected to a pressure differing from atmospheric pressure.

Abstract: A sprayer device includes a housing coupled to a water reservoir, a block having a passageway and a number of outlets. A locking member is slidably received in the passageway of the block to block some of the outlets of the block alternatively when the blocking member is slided along the passageway of the block. A number of paddle wheels are rotatably received in the block for controlling the outward flowing water. A shaft is received in the block, and a cap is threaded to the block and has a valve seat for engaging with the shaft to control the outward flowing water.

Abstract: A tool for removing water from a window frame for using forced air to remove water from behind a false window frame. The tool for removing water from a window frame includes a tubular member. The tubular member is elongate and has a first end and a second end. Each of the first. and second ends is open. An intermediate wall is positioned between the first and second ends. The intermediate wall has a plurality of holes extending therethrough. A spike is securely attached to the intermediate wall and has a pointed end extending towards the first end of the tubular member. A canister for holding a pressurized gas is positionable in. the cylinder such that the spike may puncture the canister. A valve is securely mounted in the tubular member and positioned between the intermediate wall and the second end of the tubular member. An actuating member actuates the valve such that gas from the canister may flow outward of the second end of the tubular member.

Abstract: The present invention is a squeegee with squeegee handle and remote spraying device, which includes a squeegee section having an enclosed container for holding liquid, a sprayer head, which is in connection with the squeegee section, and a surface extending in a lengthwise direction. The enclosed container has a threaded neck. The sprayer head has a threaded cap adapted for engaging the threaded neck, as well as a dispensing means for dispensing the liquid. The dispensing means includes a trigger being in connection with a conduit, a nozzle at an end of the sprayer head, and pressure inducing means for inducing a pressure change in the conduit so as to draw spraying agent into the conduit and out of the nozzle. The conduit extends through the threaded cap and into the enclosed container. There is also a squeegee blade attached to the sprayer head and being nearly perpendicular to the surface of said enclosed container.

Abstract: A windshield washer nozzle for an automotive vehicle, including a housing for retaining the nozzle, at least one fluid input port defined by the housing; and at least a first flow path and a second flow path defined by the housing in fluid communication with the fluid input port. Separate pressure flow control valves are retained in the first flow path and the second flow path, wherein fluid at a pressure below a pressure P1 can be directed through the input port and caused to flow through the first flow path, although flow is blocked through the second flow path. Alternatively, fluid in excess of a pressure P2 can be directed through the input port and caused to flow through the second flow path while flow is blocked through the first flow path.

Abstract: Water flow through a sprinkler is controlled by a valve assembly that includes a spring-biased slide shaft disposed within a valve tube and controlled by the pivotal movement of a trigger to permit accurate control of water dispensed through a barrel body by varying the separation between a stop flange of the slide shaft and a water inlet of the valve tube.

Abstract: A water sprayer has a hollow handle, a sprayer head connected to the hollow handle, a button device, a push trigger, a shaft, an O-ring, and a spring. The hollow handle has a longitudinal channel, a transverse channel communicating with the longitudinal channel, a chamber, and a hollow post. A rubber washer, a piston, and a sieve are inserted in the lower stepped hole of the hollow handle. The button device and the push trigger are inserted in the chamber of the hollow handle. The opening of the push trigger receives the button device. The shaft has a disk head and an annular groove. The O-ring encloses the annular groove of the shaft. The spring surrounds the shaft. The shaft is inserted through the hollow post.

Abstract: The present invention relates to a fire hose nozzle comprising a safety device (1) to prevent it from being displaced through the action of the water that supplies it. According to the invention, this device includes a tubular body (3), a butterfly disc (5) including two coaxial trunnions (6) pivotally mounted on the body (3), the butterfly disc being movable inside the tubular body between an open position, in which it allows the water to flow, and a closed position, in which it restricts this flow, an external control lever integral with one of the trunnions (6), and a triggering means (8) borne by the control lever (7) and bearing against the ground, holding the butterfly disc (5) in its open position when the control lever exerts thereon, owing to the action of the water flowing over the butterfly disc, a downwards directed vertical force.

Abstract: A description is given of a sanitary article or object, particularly a hand-operated shower, having a changeover device (2) for controlling a liquid flow, the sanitary article having a liquid inlet and a liquid outlet, as well as an air suction device which can be turned on or off by operating the changeover device in the manner of a water jet pump. The changeover device is so constructed that a passage cross-section formed between the liquid inlet (6) and liquid outlet (7) can be widened on turning off the air suction device. For this purpose, in addition to the pump jet opening (38) of the air suction device, it is possible to open a ring channel-like, further passage cross-section (30) arranged concentrically thereto.

Abstract: A cleaning device of an intake pipe passage of an engine provided with a container storing a washer; an air feed line with one end connected to a source of compressed air and with another end communicated with the inside of the container for feeding compressed air from the compressed air source to the inside of the container; a washer feed line with one end communicated with the inside of the container for supplying from the bottom of the container the washer compressed by the compressed air; a spray nozzle connected to the other end of the washer feed line; and a pilot valve interposed in the middle of the washer feed line and opened and closed cyclically by a cyclic pilot pressure generated by an air pulse circuit operating by air of an air source.

Abstract: A nozzle for spraying surfaces is equipped with a piston rod centrally arranged in a feeding duct. The piston rod has an impact plate which is held by a spring in a position aligned with the surface to be sprayed. As a result of liquid pressure, the impact plate arrives in a second end position at a distance from the surface to be sprayed in which. As a result of a ring gap on an input side around the piston rod, the impact plate becomes a deflecting part for the spraying liquid exiting in a ring shape, which, in a circular spraying cone directed at a flat angle with respect to the surface to be sprayed, is then emitted onto the surface to be sprayed.

Abstract: A spray head for delivering a hair care composition onto and/or into the hair comprising an inlet in fluid communication with an outlet, the inlet of the spray head being adapted for connection with an outlet of a container including a hair care composition, the outlet of the spray head including at least one hollow protrusion defining a fluid channel extending from the spray head, the hollow protrusion including an opening for delivering the atomized hair care composition onto the hair.

Abstract: A simply constructed and easy-to-produce nozzle valve (1) for oil spraying of pistons in internal combustion engines is provided. The nozzle valve (1) is formed from a thin-walled sheet-metal housing (2), a nozzle (12), a valve body (8), and spring means (10) for the valve body (8). The spring means (10) act at one end directly against the valve body (8) and rest at their other end against a support (11) extending within the housing (2). This support (11) forms a single structural unit together with the nozzle (12).

Abstract: A dispenser (20) for attachment to a container (22) containing a fluid material, including an actuator (110) which keeps the container (22) in a substantially constantly open configuration so as to allow the fluid to pass into the dispenser (20), and a controllable outlet (36), through which a portion of the fluid is emitted from the dispenser (20), substantially independent of the fluid pressure in the container (22).

Abstract: An apparatus for watering plants has a movable beam carrying several valves for dispersing water. At least some of the valves include a mechanism for sensing water flow and a regulator for adjusting the degree of opening of the valve until the actual flow corresponds to a selected flow value which is determined by a central control unit.

Abstract: A showerhead has a water-exit element, a button pivotally received in the water-exit element, a moveable flapper disposed inside the water-exit element, and a water-separating plate and a nozzle cover placed in front of the moveable flapper. The button and the valve are able to control water to flow in a selected passage and create a particular type of shower jet. By adjusting the button, different kinds of shower jets can be easily selected. The controlling device, that is, the button and the moveable flapper, has a simple structure which is easy to manufacture and to repair.

Abstract: A paint sprayer having an on/off switch, a bypass valve and a pressure adjusting valve has a single manually rotatable control that operates the switch, the bypass valve and the pressure adjusting valve.

Abstract: A continuously adjustable water flow control apparatus includes at least a control seat, a adjustment head, a push sleeve and an adjustment cap. A relative position between the adjusting plate and the push sleeve can be changed by adjusting the adjustment cap to press against the adjusting plate of the adjustment head. Accordingly, a stepless change of the sectional figure and area of the water channel is attainable. In addition, the use of the continuously adjustable water flow control apparatus in combination with different kinds of shower heads and rotational devices will meet different needs of the users.

Abstract: There is provided pre-expanded particles of a propylene resin having a high expansion ratio and excellent molding adhesion without using a volatile blowing agent or increasing an expansion pressure. The pre-expanded particles of a propylene resin are prepared by the process comprising dispersing resin particles comprising a propylene resin composition, which contains 100 parts by weight of (A) a random copolymer of ethylene and propylene having an ethylene content of 1.5 to 4.5% by weight and 0.

Abstract: A water saving mechanism is assembled with a shower device and is simply constructed in such a manner that supply of water is executed by the pressing of a push member and discharge of water is cut by the inclination of a shower head in a downward direction.

Abstract: A hand held spray spout (10) has a basket filter (26) seated against an anti-siphon valve (24) proximate the base end of a water passage (12) within the spout. The filter has a plurality of protrusions (50) mounted within the inner diameter of the valve (24) and is also biased against the rim (52) of the valve. The filter has prongs (56) extending upstream from the basket section (40) to abut and be biased by a supply hose end which is mounted to the base end (14) of the hand held spray spout (10).

Abstract: A controller for controlling the flow rate of compressed air to a spray paint gun as well as to a comparable tool which is optimally operative dependant upon receiving a specified flow rate of air includes a flow control valve which regulates the air flow rate therethrough based on a pressure differential signal received from an air flow meter. The pressure differential signal transmitted to the air flow controller is balanced against an opposing spring biased needle in the flow controller.

Abstract: An ultra high pressure waterjet cutting system which includes a valve for selectively delivering either a stream of ultra-high pressure water or alternatively, a moderately reduced but yet sufficiently high pressure to initiate cutting. The arrangement provides a convenient means for initiating cuts along the edges of workpieces and is particularly useful when encountering surfaces of brittle workpieces.

Abstract: A water spray nozzle control device has a main body, a rotatable collar, a positioning shaft, a water check collar, a plunger, a water sieve device, and a water stopping washer. The main body has a channel, a hollow threaded head, a handle, and a neck disposed between the handle and the hollow threaded head. The channel receives the water check collar, the plunger, the water sieve device, and the water stopping washer. The hollow threaded head engages with a water spray nozzle. The neck has a through hole receiving the positioning shaft. The rotatable collar encloses the neck.

Abstract: An enhanced mixing equipment system including a power supply, an actuatable valve, the actuatable valve connected via a line between the power supply and a storage vessel, an actuatable discharge/mixing valve attached to a portion of the storage vessel, the actuatable discharge/mixing valve connected via a line between the actuatable valve and a hose, a terminal end of the hose having a nozzle, a control input line connecting the power supply to a control valve positioned adjacent to the nozzle, and a control return line having a safety bleed positioned adjacent to the actuatable valve and connecting the control valve to the actuatable valve and the actuatable discharge/mixing valve such that any loss of pressure in the control return line results in closing the actuatable valve and the actuatable discharge/mixing valve as pressure is released through the safety bleed. With such an arrangement various configurations are possible which provide various redundancies in operator safety.

Abstract: A nozzle mounting and control system for use in sprayers comprising multiple sets of nozzles mounted in the operating position on a sprayer boom. Control valves are operable to select which sets of nozzles are operating at any given time. The valves may be remote controlled and may further incorporate a rate controller to maintain a chosen application rate as speed varies. This application rate may be varied conveniently. The rate controller may be a present rate controller such as measures the speed and total fluid volume delivered and then adjusts the pressure to maintain the application rate, or may be a novel rate controller which measures the speed and fluid pressure and then adjusts the pressure to maintain the application rate. Either rate controller would operate the control valves to select the proper combination of operating nozzles in addition to adjusting the pressure.

Abstract: A freeze-proof hydrant has a hollow, tubular housing adapted to be buried in the ground in a vertical orientation so that its upper end is approximately even with the surface of the ground and its lower end is below the local frost line. A base fitting at the lower end of the housing is connected to an underground pipe and has an internal shut-off valve for controlling the flow of water out of the underground pipe. The lower end of a removable standpipe has a threaded fitting which mates with the base fitting in a manner that opens the shut-off valve when the standpipe is screwed into connection with the base fitting. The standpipe projects upwardly through the housing to a point above ground level and terminates in a faucet. When the standpipe is inserted downwardly into the housing and screwed into connection with the base fitting, the shut-off valve in the base fitting automatically opens so that water flows upwardly into the standpipe and the faucet may be operated to deliver water as desired.

Abstract: A dispenser head (2) includes a pivotable discharge stud (17). The outlet duct (15) thereof is bounded by an inner body (22) and is located laterally adjacent to the stud axis (11). Thereby the medium may be discharged in atomized form while being multiply deflected.

Abstract: An irrigation system comprising a container for holding a liquid, a tap, a device for simultaneously puncturing the container and securing the tap to the container and a device for regulating the dispersement of the liquid from the container. Also provided is a method of irrigation comprising the steps of attaching at least a portion of a spike to a tap thus forming a tap and spike assembly, puncturing a container for holding a liquid with the tap and spike assembly and simultaneously securing the tap to the container wherein the spike automatically dislodges from the tap and falls into the container, and dispersing the liquid from the container to a desired irrigation area.

Abstract: A variable accumulator or regulator controls grain or other particulate material falling through and being discharged from a conduit. An array of blades are mounted at the discharge end of the accumulator to control the flow of the particulate material therefrom. A counterbalance mechanism is coupled to each of the blades and can be precisely adjusted to provide the appropriate counterbalancing force on the blades to control the particulate material flow without damage to the particulate material.

Abstract: A hose nozzle is formed of a main body, a control member and an actuating member. The main body is provided therein with a water duct, a channel and a water discharging tube. The flow of water moving through the water discharging tube is regulated by the control member which is actuated by the actuating member to rotate to various extends to regulate the amount of water that is allowed to pass through the control member.

Abstract: A water flow rate control device includes a water output device connected to a water supply source for output of water through a water passage defined therein. A water flow rate control unit is mounted in the water output device and configured to close/open the water passage of the water output device and to regulate the water flow rate passing through the water passage of the water output device. A control switch is operated to drive the water flow rate control unit, causing the water flow rate control unit to close/open the water passage of the water output device. A pressure relief control unit includes a spring supported relief valve mounted in the water output device and coupled to the water flow rate control unit to automatically release a high pressure when the water flow rate control unit is driven to close the water passage of the water output device.

Abstract: A spraying system is provided with a plurality of spray sections, a discharge line coupled to each of the spray sections, and a control valve connected to each discharge line for regulating the flow of liquid from the discharge line to the spray section. The control valves are mounted in side-by-side relation and each have a housing with outwardly projecting retaining flanges formed thereon. The spraying systems also including plastic mounting clamps for connecting together the retaining flanges of adjacent control valves. The plastic mounting clamps each having separate first and second clamping members. The first and second clamping members each having a respective retaining section secured in overlying relation to the retaining flanges of adjacent control valves for captively securing the retaining flanges together.

Abstract: A water amount controlling switch structure of water injection gun, including a gun housing, a controlling pin, a water sealing gasket, a locating ring, an adjustment pin, a trigger, a push button, a pad member, a water sealing ring and three springs. The trigger is U-shaped and pivotally connected with an opening of a chamber of the gun housing. A lower portion of inner side of a middle board of the trigger is disposed with a projecting conic head pushing post. An upper section of the middle board is disposed with a push button notch. A lower edge of the notch is formed with a supporting slope face. The push button is received in the notch. An upper section of inner side of the push button is disposed with a hollow fitting post. A bottom edge of the push button is formed with a zig-zag micro-adjustment slope face leaning against and engaging with the supporting slope face of the notch of the trigger.

Abstract: A pre-load mechanism has a self-mounting coil spring that resiliently forces a pre-loading member against a pre-loaded member. The spring has an active helical-coiled portion that is resiliently expandable and contractible in axial length to set the pre-load force and a mounting coil portion that has an interference fit with the mounting member for allowing the pre-load force to be set by forced positioning of the mounting coil portion on the mounting member to a calibrated position, and once the pre-load has been so set, for maintaining the mounting coil portion in the calibrated position as the active coil portion expands and contracts in axial length. The mounting coil portion has non-circular helical convolutions with protruding lobes that bear against the mounting member.

Abstract: Embodiments of a fluid system and of methods of operation of a fluid system are disclosed. In one embodiment, the fluid system comprises at least one source of fluid, a nozzle and at least one first valve fluidly connecting the nozzle with the at least one source of fluid. The at least one first valve is movable between a first position where fluid flows between the at least one source of fluid and the nozzle, and a second position where fluid does not flow between the at least one source of fluid and the nozzle. A waste receptacle and at least one second valve fluidly connecting the waste receptacle with the at least one source of fluid are included. The at least one second valve is fluidly connected between the at least one source of fluid and the at least one first valve.

Abstract: The present invention relates to an apparatus for variable flow control for precision applications, such as agrochemical applications. The invention is directed towards a flow control device comprising a metering rod moveably mounted within a housing. The position of the metering rod is controllable so as to control the flow rate, flow angle and/or droplet size of fluid passing through the flow control device of the present invention.

Abstract: An aircraft fueling nozzle includes a generally cylindrical nozzle body having an extending adaptor receiver housing within which a rotatable interlock ring is supported. A generally planar annular locking lug retainer overlies the interlock ring and is secured to the upper surface of the adaptor receiver housing. A valve seat is supported upon a center wall of the interlock ring and supports a valve seat which cooperates with a valve poppet for fuel flow control. The nozzle body defines a vertical channel within which a movable poppet link is disposed and movable. The interlock ring defines a downwardly extending plate which is rotatable between positions covering a portion of the vertical channel and exposing the vertical channel.

Abstract: An improved spraying device for mixing a first fluid with a second fluid prior to dispensing into the environment. The spraying device includes a spraying head connected to a cartridge bottle. A shroud covers the spraying head to cartridge bottle connection. The chemical remains in a closed system even after the cartridge bottle is attached to the spraying head. A unique gear and/or cam system is provided to open the flow path of the second fluid and provide a positive operation. Also, the orifice diameter of the second fluid flow path is predetermined.

Abstract: A manual spray dispenser for pressurizing a liquid to a predetermined pressure is provided. The spray dispenser includes a pressure adjustment assembly to adjust the predetermined pressure between a preselected range of pressures. The pressure adjustment assembly includes an adjustable biasing member to supply a force to a pressure chamber check valve in a direction opposite the flow of liquid from the reservoir to the atmosphere so that the pressure in the delivery passageway can be varied. Optionally, a two-hole rotating nozzle is provided in combination with a pressure adjustment assembly. In another aspect of the invention, an exit orifice purge system is provided to reduce dripping from the nozzle in the manual sprayer after dispensing.

Abstract: A soap dispensing shower unit includes a base member which has plural shower head unit supporting members and plural soap container supporting members. Several soap supply containers are held by the soap container supporting members, and plural shower head units are held by the shower head unit supporting members. A soap dispensing shower head is included with the shower unit. This shower head includes a support with a shower head detachably fit to one end and a water supply pipe connector at the other end. A valve arrangement is provided with the support. This valve arrangement includes a soap supply line, a soap valve, a water supply line, a water valve and a junction where the soap supply line and the water supply line merge together. The soap valve and water valve may be selectively activated to supply soap only, water only, or a mixture of soap and water. Liquid soap is fed from the supply container to the soap supply line by a venturi feed arrangement or by a gravity feed arrangement.

Abstract: A balloon valve that can control the flow of a display fluid through the supply pipe of a water display. The supply pipe is typically suspended from a structure and releases a slug of water into a pool. The pipe is located at a distance from the pool so that the water slug breaks up into a rain shower. The balloon valve includes an inflatable hose located within the supply pipe and coupled to a source of pressurized working fluid. The flow of working fluid into the balloon valve is controlled by a control valve. When the control valve is in a first state, working fluid flows into the balloon valve to expand the hose. The hose is expanded to completely fill a portion of the pipe and prevent the display fluid from flowing through the pipe. When the control valve is in a second state, the balloon valve is deflated so that the display fluid can again flow through the supply pipe and out of the display.

Abstract: A spray element for use with a mold sprayer of the type used to spray a mold prior to or between cycles of a manufacturing operation such as die-casting, drop forging or other operations involving the working of metals. The spray element includes a valve body having an internal elastic pretension. The valve body may be positioned in either an open or closed position in relation to a valve seat. A control pressure is applied, through a separate feed line, to the valve body to open and close the valve by forcing the valve body against or away from the valve seat. The spray element also includes a feed line supplying working air which cooperates with an atomizer attached to a feed line supplying a working medium to the atomizer to atomize the working medium when the valve body is actuated.

Abstract: A shut-off valve, for use with a sprinkler head affixed to a riser pipe, including a valve seat affixed within the riser pipe upstream from the sprinkler head, the valve seat having an opening and impeding flow through said riser except through the opening. A movable valve element is located within the riser pipe upstream from the valve seat, the valve element being movable between an open position, in which it is spaced apart from the valve seat, and a closed position, in which it engages the valve seat to close the opening and impede fluid from flowing through the riser pipe. A spring biases the valve element toward the valve seat, and a perforated tube extends from the valve element through the opening in the valve seat and contacts the sprinkler head to maintain the valve element in its open position.

Abstract: A one-touch on-off showerhead valve apparatus for controlling the flow of fluid by pushbutton operation that includes a body having an inner cavity which is divided into first, second and third spaces by a bellows and a support plate mounted therein. The bellows defines a first flow path to permit fluid entering the apparatus to flow between the first and second spaces. A spool fixed to and penetrating both the support plate and bellows defines a second flow path having a diameter larger than the first flow path which permits fluid to flow between the second and third spaces. A valve connected to the pushbutton selectively permits fluid to flow through the second flow path. A third flow path is formed in the support plate that permits fluid to flow between the first and third spaces. When the second flow path is normally closed by the valve, the bellows blocks the third flow path preventing fluid from flowing into the third space and out of the apparatus.