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
  • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
  • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
  • F16K17/19—Equalising valves predominantly for tanks
  • F16K17/194—Equalising valves predominantly for tanks weight-loaded

Definitions

• the invention relates to a safety fitting, consisting of two springless poppet valves connected to one another on the housing side, of which the first serves to protect against excess pressure and the second serves to protect against negative pressure.
• a springless poppet valve which can be used as a suitable shut-off device in a safety valve of the genre identified in the introduction, is known for example from DE 32 44 381 C2.
• This known shut-off device is particularly suitable for securing plants in the food and beverage industry against inadmissible negative pressure.
• the spring-free valve disk is designed in terms of weight such that it leaves its seat even with a slight negative pressure.
• the valve disk is made on the one hand from a non-metallic material and on the other hand with the least use of materials, that is to say, it is made with an extremely low weight overall.
• the known springless poppet valve is fundamentally also suitable for overpressure protection if the valve disk is equipped with the weight required for this in accordance with the required response pressure. This can be done on the one hand by its geometric and material design and / or on the other hand by additional weights arranged on the valve plate.
• the direct mounting of the two poppet valves in the two housing openings of a connecting housing ensures an overall arrangement that is extremely easy to clean. Both poppet valves can be cleaned from the connection housing either in flow or by spraying from a suitable spraying and distributing device, if the second poppet valve serving to protect the vacuum is provided with a lifting drive.
• the proposed safety fitting is extremely compact in terms of space, since its main dimension - measured over all components in question in the direction of the switching movement of the valve plate - is smaller than with simple addition of independent spring-free plate valves with suitable piping.
• the use of unmodified and / or also modified standard components results on the one hand in a clear and uncluttered overall arrangement and on the other hand it reduces the number of components required for representing the safety fitting to a minimum.
• An advantageous embodiment of the proposed safety fitting provides that the upper and lower housing openings are arranged one above the other and coaxially with one another, as a result of which the advantages sought with the present invention can be achieved particularly easily.
• the overall arrangement proposed according to the invention allows the first valve plate to reach into the upper housing opening of the connecting housing with an extension arranged centrally on its underside and for the extension in cooperation with a stop pin formed on the upper side of the second valve plate to limit the stroke for the second valve plate arranged underneath forms.
• This measure eliminates the need for an independent stroke-limit stop for the second valve disk.
• the first valve plate can easily serve as a stroke limit stop, since under vacuum, when the second valve plate leaves its seat, it is additionally pressed onto its seat by this vacuum.
• a further embodiment of the proposed safety valve provides that a stop pin is formed on the top of the first valve plate. The latter comes into contact with the required opening stroke of the first valve plate on an inner surface of a valve housing part, as a result of which a clearly defined end position is ensured.
• valve seats of the poppet valves each formed by a seat ring and a valve plate, and the valve plates as a whole have the same construction. This measure further simplifies the overall arrangement using largely identical standard components.
• a further embodiment of the proposed safety valve according to the invention provides for the centrally arranged one Extension of the first valve plate with a cavity to accommodate additional weights, such as lead balls.
• an external additional weight is provided, which is arranged at a distance from a fulcrum of a one-sided lever arm which is fixed via a bearing part on the valve housing part, the first valve plate engaging the lever arm in the region between the additional weight and the fulcrum via an extension part arranged in its axial axis of symmetry.
• the additional weight is arranged on the lever arm so that it can be moved and locked in any position relative to its pivot point.
• the external additional weight can be arranged, for example, within the valve housing part enclosing the upper side of the first valve plate.
• a particularly simple handling of the external additional weight is given if, as is provided by a further advantageous embodiment, the additional weight and the lever arm are arranged outside the valve housing part and the extension part is led out into the environment via a bushing in the valve housing part and attacks the lever arm there.
• the extension part is passed through the valve housing part in a contact-free manner in the area of the bushing.
• a forced transfer of the second poppet valve into an open position can be carried out.
• a plunger of the air drive acts on an extension arranged centrally on the underside of the second valve plate.
• the stroke of the air drive can be dimensioned such that it reaches through the second poppet valve to the first poppet valve by means of its tappet and also transfers the latter to an open position. This makes it possible to move both valve disks into an open position with a single lifting drive in order to ensure flow or spray cleaning of the entire safety valve.
• a signaling device can be arranged in the downward-facing recess of the plunger, which in cooperation with an The lower end of the extension of the second valve plate provided metallic closure part forms a feedback device for the second valve plate.
• FIG. 1 shows a meridian section through the proposed safety fitting in a particularly advantageous embodiment, the valve seats and the valve plates being constructed identically and the second poppet valve serving to protect against negative pressure being provided with a lifting drive and
• FIG. 2 shows a modified embodiment of the proposed safety fitting according to FIG. 1, the additional load on the first valve plate serving to protect against excess pressure being provided by an external additional weight that is spatially separated from it.
• a connection housing 1 (Fig. 1) is connected to a pipe pipe connection la and equipped has at its Obersei- te 'has an upper and a lower lc Gepuruse ⁇ opening on its underside and ld. These are arranged coaxially to one another and are located vertically one above the other in the installed position of the safety valve.
• Each of the housing openings 1c and 1d is delimited by a housing flange 1b, the one on the top of the connection housing 1 serving for connection to a housing 2a of a first poppet valve 2 and that on the underside for connection to a housing 3a of a second poppet valve 3 .
• the housings 2a and 3a directly engage in the associated housing opening lc or ld.
• the housing 2a is formed at its upper end in the form of a first seat ring 2b, on and in which a first valve plate 5 is arranged, which extends with its guide ribs 5a through the housing 2a.
• a second seat ring 4 forms the valve seat of the second poppet valve 3 in connection with a second valve plate 6, the guide ribs 6a of the second valve plate 6 reaching through the second seat ring 4 and the housing 3a.
• the valve seats of the poppet valves 2 and 3 as well as the valve poppets 5 and 6 are each of identical construction overall.
• the second poppet valve 3 which serves to protect against negative pressure, has in the casing area of its housing 3a a plurality of inlet openings 3b distributed over the circumference, via which air, if necessary, can flow from the surroundings of the safety fitting into the connecting housing 1 via the exposed seating area, via a first connecting piece 3d, cleaning agent which accumulates in the housing 3a and possibly in a collecting tray 3c during the cleaning procedure can be removed.
• a second connection piece 3e serves, for example, to accommodate a heater or other additional devices.
• Both the first and the second valve plates 5 and 6 each have on their underside a centrally arranged extension 5b or 6b, in each of which a cavity 5e or 6e is provided.
• This cavity 5e or 6e is closed in each case with a closure Part 5c or 6c, the closure part 6c, if it is of metallic construction, in conjunction with a signaling device 8 which engages in and through a ventilation drive 7 from below, a feedback device 6c, 8 for the second Valve plate 6 forms.
• the cavity 5e in the centrally arranged extension 5b of the first valve plate 5 can serve to accommodate additional weights 13, for example lead balls, as a result of which the weight force of the entire first valve plate 5 is adjusted, which is required for the desired response pressure can.
• each valve disk 5 or 6 On its upper side, each valve disk 5 or 6 has a stop pin 5d or 6d, via which its stroke limitation is ensured.
• the lifting drive 7 is equipped with a piston 7a acted on by a spring 7c, which engages in the housing 3a via its plunger 7b and ends there in the immediate vicinity of the closure part 6c, the piston 7a can be acted upon with control air via a connection opening 7d, whereby it moves upwards and comes into contact with its plunger 7b on the closure part 6c of the second valve plate 6 and, during its further stroke movement, brings the latter into a lifting position in which a flow or spray cleaning of the entire interior of the second bowl valve 3 is feasible. If more cleaning agent is provided than can be discharged into the surroundings of the safety fitting via the first connecting piece 3d, the collecting bowl 3c serves for the temporary provision of this amount of cleaning agent.
• the housing 2a engages with the first seat ring 2b formed at its upper end in a housing opening 11c of a valve housing part 11, which can be continued via a pipe connection 11a.
• the valve housing part 11 is delimited and surrounded in the region of its housing opening 11c by a housing flange 11b, via which a connection is made to the housing 2a.
• the first and second seat rings 2b and 4 are each equipped with a seat seal 10, on which the first and second valve disks 5 and 6 rest under their own weight.
• connection housing 1 is on its underside via its housing flange 1b with a corresponding counter flange of the housing 3a, which is not described in more detail, and on its upper side via the housing flange 1b with a corresponding counter flange of the housing 2a, which is likewise not specified, each via connection means 12 (eg tension rings) connected.
• connection means 12 eg tension rings
• the housing 2a is sealed at its upper and lower ends by a housing seal 9 against the valve housing part 11 and the connection housing 1, respectively.
• a further housing seal 9 serves to seal the second seat ring 4 within the lower housing opening 1d.
• FIG. 2 shows a modified embodiment of the proposed safety fitting, in which the additional load on the first one, which serves to protect against overpressure Valve plate 5 is not realized via the additional weight 13 arranged on or in it, but via an external additional weight 14.
• the latter is arranged displaceably on a lever arm 16 on one side and can be locked in any position relative to its pivot point D by means of a clamping device 15.
• the pivot point D of the lever arm 16 is formed in a bearing part 11 which is fixedly connected to the valve housing part 11.
• the first valve plate 5 continues in connection with its stop pin 5d and in alignment with the axial axis of symmetry of the valve plate 5 in an extension part 5e, which is led out into the environment via a bushing 11d in the valve housing part 11 and there on the lever arm 16, in the area between the external additional weight 14 and the pivot point D.
• an extension part 5e is led out of the valve housing part 11 without contact.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lift Valve (AREA)
• Safety Valves (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6887027

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (2)

• 1992
  • 1992-12-11 DE DE9216891U patent/DE9216891U1/de not_active Expired - Lifetime
• 1993
  • 1993-12-04 WO PCT/EP1993/003409 patent/WO1994013988A1/de active Application Filing

Patent Citations (2)

Also Published As

Similar Documents

Legal Events