Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
  • F16K13/04—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member

Definitions

• This invention relates to a valve, more particularly, but not exclusively, to a valve for controlling the release of fluid under pressure.
• valves The flow of fluids is almost invariably controlled by valves. While many valves allow the rate of fluid flow to be controlled, it is often not necessary for valves to be capable of this. For example, where it is desired to quickly release fluid under pressure, it suffices to have a valve which merely prevents flow or permits flow. Apart from "bursting disc" type valves which permit flow once pressure exceeds a maximum, the applicant knows of no other valve which can be selectively opened without the need for moving parts which add to the expense of valves and effect the reliability thereof. The latter two considerations are frequently of great importance when selecting valves.
• a valve comprising a body with a flow path therethrough, a membrane associated with the flow path to prevent fluid flow therethrough, and radiation means located adjacent at least part of the membrane and selectively operable to irradiate the membrane to cause weakening or destruction of at least a part thereof.
• the radiation means to provide heat; for the radiation means to be a resistive element; for the body to be in the form of a board with at least one orifice therethrough defining the flow path; and for the resistive element to extend at least partially around the circumference of the at least one orifice.
• the membrane to be made of a plastics material; for the membrane to be adhesively secured to the body over one end of the flow path; for the membrane to be formed from a number of layers of a material; and for the membrane to be operatively melted by the radiation means.
• the body to be securable to a reservoir with the flow path adjacent an outlet from the reservoir; for the radiation means to be connected through a switch to electricity supply means; for the electricity supply means to be a battery or mains supply; and for the body to be a circuit board with the resistive element printed thereon; alternatively for the resistive element to be printed on the membrane; further alternatively to be captured within the membrane.
• Figure 1 is an oblique view of a first embodiment of a valve
• Figure 2 is a sectional side elevation of the valve in Figure 1 ;
• Figure 3 is a part sectional side elevation of the valve in Figure 1 in use on a reservoir;
• Figure 4 is an oblique view of a second embodiment of a valve
• Figure 5 is an oblique exploded view of a third embodiment of a valve
• Figure 6 is an oblique view of a fourth embodiment of a valve.
• Figure 7 is an oblique view of a trunk with a pressurised container located therein.
• a valve (1) is shown in Figures 1 and 2 and includes a board-like body (2) having a top surface (3) and a bottom surface (4) and a central orifice (5) extending between the surfaces (3,4).
• the body (2) is made from material used to construct electronic circuit boards.
• a resistive element (6) is printed on the body (2) to extend part way about the circumference of the orifice (5) from contact points (7) near a side (8) of the body (2).
• a membrane (10) made from a plastics material is adhesively secured to the body (2) over the orifice (5) and resistive element (6).
• Electrical wiring (11) is soldered to the contact points (7) to connect the resistive elements (6) with a battery (12) and a normally open in-line switch (13).
• the switch (13) is closed causing an electrical current to flow through the resistive element (6) to produce heat.
• the heat produced due to the short circuit melts that part of the membrane (10) abutting the resistive element (6).
• the membrane (10) is subjected to pressure in the direction of the orifice (5), the melting thereof allows the pressure to rupture the membrane.
• the body (2) can be secured between flanges (20) over the outlet (21) of a reservoir (22) filled with a fluid (23) under pressure.
• the body (2) will be secured with the top side (3) carrying the membrane (10) facing into the reservoir (22).
• the membrane (10) is selected to withstand the pressure of the fluid thereon and so prevent fluid flow through the outlet (21) and orifice (5).
• the material used in the membrane (10) will also be selected ' to resist corrosion that could possibly be caused by the fluid (23). It has been found that the material sold under the brand name "Mylar" and which is supplied with an adhesive backing provides excellent resistance to a wide range of fluids and to deformation by pressure, but any suitable material can be used.
• the switch (13) When it is desired to release the fluid (23) in the reservoir (22), the switch (13) is closed causing the membrane (10) to melt as described above, allowing the fluid (23) to escape through the outlet (21 ) and orifice (5).
• valve of the invention can only be used once, it can easily be replaced without incurring significant costs.
• a valve (40) could include a board-like body (41) with an elongate aperture (42) therethrough covered by a suitably shaped membrane (43) and having a resistive element (44) extending across the orifice (42) as shown in Figure 4.
• the resistive element will be a length of resistive wire.
• a number of apertures can be formed in a valve body rather than a single large aperture. This helps reduce distortion of the membrane caused by pressure.
• the membrane (50) can have two layers (51) with a resistive element (52) interposed between the layers (51).
• the membrane (50) is secured to a cylindrical valve body (55) by a radially inwardly extending flange (56) at the end of a sleeve (57), the body (55) and sleeve (57) being complimentary threaded (58) for engagement of the sleeve (57) over the body (55).
• An aperture (59) in the flange (56) receives a connecting wire (60) from the resistive element (52).
• the use of layers has been found to be particularly useful where the material used for the membrane tends to exhibit non-uniform strength characteristics. Any suitable material can be used and the thickness of the material used will depend on the application.
• the membrane can be in the form of a thick disc of plastics material with a resistive element moulded therein.
• radiation such as gamma radiation could even be used to weaken or destruct a membrane.
• the radiation source and valve body would be of suitably robust construction and not be intended for disposal, whereas the membrane would be easily replaceable after destruction.
• a resistive element (70) can be printed on a membrane (71) of a suitable material, for example the material used for dot matrix printer head cables.
• the resistive element can be made to extend over the orifice (72) in a valve body (73) and by exciting the element with electrical current using suitable control means (74) a strain gauge can be formed. This will allow the pressure in a reservoir (not shown) to be monitored.
• the membrane (71) can be made to rupture as described above. This form of vaive will be particularly useful where it is important to measure reservoir pressure as a separate pressure monitoring system is obviated.
• the control means (74) can be configured to cause rupture of the membrane where the pressure level in the reservoir exceeds a certain limit.
• a trunk (80) is shown for use in transporting cash and, in conventional fashion is supplied with a lid (81) hingedly secured thereto and a handle (82).
• the lid (81) is selectively lockable to prevent access to the trunk (80), and the locking mechanism is controlled through a key pad (83) and a processor (not shown).
• a pressurised cylinder (84) containing a banknote staining die is secured inside the trunk (80) by straps (85).
• the container (80) has a nozzle (86) with a valve described with reference to Figures 1 and 2 preventing flow through the nozzle (86).
• a battery (87) provides the processor with electrical power and is also used to open the valve.
• the trunk (80) is loaded with cash and locked and can only be opened when a code is entered using the key pad (83). If the lid (81) is forced open, or the incorrect code entered, the processor acts as a switch to create a closed circuit between the battery (87) and the valve in the nozzle (86) to open the valve. In this way, the contents of the container (84) can be reliable and quickly dispensed into the trunk.
• the processor could be programmable to only allow opening of the lid after a predetermined time or could even include a receiving unit for a remote signal to allow remote operation of the valve.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Valve Housings (AREA)
• Electrically Driven Valve-Operating Means (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=25586547

Family Applications (1)

Country Status (5)

Citations (3)

• 1998
  • 1998-11-17 ZA ZA9810488A patent/ZA9810488B/xx unknown
  • 1998-11-18 EP EP98955248A patent/EP1030990A1/de not_active Withdrawn
  • 1998-11-18 AU AU12179/99A patent/AU1217999A/en not_active Abandoned
  • 1998-11-18 WO PCT/AP1998/000007 patent/WO1999027285A1/en not_active Application Discontinuation
  • 1998-11-18 JP JP2000522391A patent/JP2001524651A/ja active Pending

Patent Citations (3)

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