US2255774A - Quick release valve - Google Patents

Description

Sept. 16, 1941. w.` E. HUFFMAN ETAL .QUICK RELEASE VALVE Filed July 30, 1956 9 M v 6 0 4 w. 6 7 e nF4 A. e W www w mi? m 9 E? /m .....l L

MLA/4M Y i v Patented Sept. 16, 1941 QUICK RELEASE VALVE William E. Huffman and George W. Replogle, Dayton, Ohio Application July 30, 1936, Serial No. 93,434 Y (Granted under the act of March 3, 1883, as amendedV April 30, 1928; 370 0. G. 757) 18 Claims.

ploys carbon dioxide as the extinguishing me-l dium. The carbon dioxide is retained in the container under a very high pressure until it is desired to discharge the gas. When the gas is released it is forced from the container by its own pressure. Y

It is an object of the present invention toprovide a novel valve which serves to retain the iiuid medium pressure in the container Without leakage.

It is a further object to provide a valve which may be used as a lling fixture without necessitating the use of a separate lling xture when the container is to be charged with gas.

A still further object is to provide a valve which may be opened by the positive pressure of the gas.

Still another object is to provide a valve in which the valve releasing means may be incorporated in the valve discharge means.

A further object is to provide a valve wherein the gas may be safely discharged orvvented when the gas pressure is excessive due to high temperatures.

Another object is to provide a valve in which the discharge passage for thegas may be used to vent the gaswhen the pressure is excessive due to high temperatures.

These and other objects will be apparent from the following description and drawing, wherein;

Figure 1 is an elevational View of a nre extinguisher employing one embodiment of the invention.

Figure 2 is a View in cross-section of the valve of Figure 1.

Figure 3 is a view in section of the upper part of the valve of Figure 1 illustrating the discharge and release means.

Figure 4 is an enlarged lcop plan view of Figure 1.

Figure 5 is a view in section of another embodiment of the invention.

Figure 6 is a cross-sectional view illustrating certain details of the valve of Figure 5.

Figure '7 is a view in section of another valve constructed in accordance with the present invention.

In all of the gures the same numbers desig nate corresponding parts.

With reference to Figure 1, the re extinguisher there illustrated consists of a container of carbon dioxide I to Which is attached a valve 2. The valve 2 has connected thereto, by means of a discharge conduit 3, a discharge shield, or horn, 4. 4 are rotatable with respect to the valve 2 and accordingly a clip 5 is provided on the container I to hold the conduit and horn securely against rotation. -The clip is so constructed that the horn may readily be removed from the clip when it is desired to employ the extinguisher.

The details of the valve areshown in Figure 2, which will now be referred to. The valve consists of a valve body 6 provided with external threads 'I at its lower end adapted to engage with corresponding threads` in the neck of the container I to secure the valve to theV container. In the valve body 6 is a passage 8 provided with internal threads 9 to permit attachment of a syphon, or dip tube, I0 at one end. The syphon, or dip tube, only a portion of which is illustrated, extends to a point in close proximity to the bottom of the container and thus serves to allow communication between the valve and the interior of the container. In the valve body 6, at the opposite end of the passage 8 and in direct communication therewith, is a chamber II. An annular valve seat I2 in the chamber surrounds this end of the passage.

The wall of the chamber II is provided with threads I3 adapted to coact with similar threads on the closure member or bonnet I4 which closes the chamber II of the valve body. 'Ihe bonnet I4 is made so that it will t closely within the chamber II in order to aid in preventing leakage around the bonnet of any carbon dioxide while the gas is being discharged through the valve. However, to prevent all leakage, the wall of the valve body has an annular shoulder I5 on which rests a packing material I 5. The packing material is pressed against the shoulder I5,

the walls of the valve body 6, and the bonnet I4 by a packing bushing I'I. The packing bushing is held in place on the valve body by the threads I8. This manner of fastening permits the amount of compression under which the packing material is held to be varied at will and the The conduit 3 and the discharge shield is made almost equalr to the diameter of the bore of the closure member I4 so as to permitl a close Vsliding fit therebetween. At the lower end of the stem I9 is an enlarged portion 2| within which is, secured by a pin 22, a valve plug 23.`

The bore of the bonnet I4 is also enlarged to receive the enlarged portion 2I in a close working t.

The iiow of gas from the container through theA passage 8 is regulated and controlled by a valve proper which in the closed position of the valve covers thevalve seat I2 and prevents any passage of gas by this seat. The valve proper consists of arupturable safety disc 24 of a'thin franegible material designed to rupture at a predetermined pressure, and an annular gasket 25 of a phenol composition, Yor of some other suitable material. The gasket and the disc are mounted in a recess in the lower end of the valve plug 23. The disc is placed in the recess first and the gasket is then placed on the disc and the recess wall of the plug is rolled over on the gasket to securely hold these parts in the recess.

'-Where'rthe enlarged' portion 2| begins on the stem I9 is a shoulder 2B.- The bore of the bonnet I4 is also enlarged to receive the enlarged portion- 2| and a Vshoulder 21 is thus formed in the bere yof the bonnet I4. It will thus be seen that the upward movement of the valve stem I9 is governed by these coacting shoulders and all upward movement of the stem I 9 is prevented when the shoulders are bearing on eachother.

AV pin 28is secured in the wall lof the bonnet I4 and passes transversely across the bore of the bonnet. A slot 29 is cut in the wall of the stem I9 into the bore '20 and it is throughthis slot that the pin passes. The pin 28 has twodistinct functions. It prevents turning of the stem I9 in the bonnet'l 4 since the wall of the stern I9 strikes thepin when the stem is turned. Turning of the stem might be very detrimental since the valve might be prevented from operating as will be explained hereinafter. 'Ihe other function of the theplug23 has a passage 30 which corresponds in size to and communicates with the bore 20 of the closure member I9. Any gas in the chamber II may enter the bore ,30 through the diametri-` vcally opp'osedrports 3I in the wall of the plug. The gas .having entered the bore 30 passes through the bore 29 ofthe stem and escapes from the upper end of the stem through the discharge slot 32 Ycut in the upper end of the stem, to the interior of the bonnet I4. g

A cam shaft 33 passes diametrically through and atrright angles to the bore of the bonnet I4 near its closed end. In the central portion of the shaftso'as to 'be adapted to coact with the upper surface 34 of thestem is a valve controlling member consisting of a cut-out cam surface 35. The manner in whichk the cam shaft 33 is secured at the lupper end ofthe bonnet is best illustrated by reference to Figure 3. Y 1

The shaft extends through the walls of the bonnet and one end 36 is journaled by the wall of the bonnet I4. The portion of this end of the shaft which is exterior of the bonnet is provided with threads 31. A cap 38 is secured by means of these threads to this end of the cam shaft. Between the cap 38 and the wall of the bonnet are placed two packing gaskets 39 having interposed between them a metal key washer 39e. A keyway 40 is milled in the shaft to receive the tongue on the key washer 39a.y The purpose of the key is to prevent the nut 38 from loosening when the cam shaft is rotated due to binding between the packing gaskets 39 and the bonnet I4 of the valve. With the interposition of the key between the gaskets the key will rotate with the shaft and the nut being secured against the gasket will rotate with the shaft instead of loos, ening. The nut will thus hold the shaft securely at all times. v

The opposite end of the cam shaft has at surfaces 4I)a milled atl the outermost point. journal 4I rests in a recess formed in the wall of the bonnet I4 and has a hole in .the closed end thereof adapted to receive the milled surfaces 40a. The journal is secured to the shaft by the pin 4Ia which extends through the journal and the shaft. The coacting surfaces cause rotation of the cam shaft when .the journal is rotated while the pin maintains the journal on the shaft. The journal rests on a sealing gasket 4Ib which lies in the recess against the journal. A port 42 is provided in the wallof the journal. This is shown dotted in Figure 3. The conduit 3 is at? tached tothe journal, in order that the conduit may communicate with the interior of the journal through the port 42.

'Ihe top View of the extinguisher in Figure 4 illustrates the attachment of the conduit and horn 4 to the valve itself. As is there illustrated the conduit is bent Vso as to centerl the horn with thecontainer. f

In order to secure the bonnet I4 in the valve body'so that it cannot beV removed from the valve body a set screw 43 is provided in the wall of the valve body 6. The set screw will act as a stop for the bonnet I4 but will not prevent rotation of the bonnet which is desired under certain circumstances. y

'I'he operation of the valve is very simple. When it is necessary to charge the container after the container has been emptied, the horn is removed from the conduit. The bonnet I4 is then rotated and raised in the Valve body until the stem I9 is in such a position that the cam shaft may be rotated to the closed position of the valve bearing on the upper surface of the stem. I'he conduit is then in such a position that when the horn is Vattached it will nt snugly against the side of the container as is illustrated in Figure 1. The bonnet I4 is then rotated until it has raised the valve proper from the seat, by means of the pin 28, so that any'gas entering through the bore 20 of the bonnet may pass the seat and enter the container.

The gas supply for charging the container is then connected to the conduit and gas is introduced into the container. When the container has been fully charged the bonnet I4 is again lowered in the valve body until the valve proper rests securely on the valve seat. The position of the stem I9 with respect to the cam surface is always such that the cam surface will coact with the top 34 of the stem I9 in the same po'- stion because of the pin 28. Of course, it may not be convenient to rotate the bonnet and in that event it may be more desirable to rotate the yvalve body and the container while the bonnet I4 is held in a fixed position. The gas supply is then disconnected from the conduit and the discharge horn is reconnected thereto and fastened in the clip 5. 'Ihe extinguisher is now ready for use.

When the extinguisher is to be operated it is only necessary to remove the horn from the clip and raise it and the conduit from the normally inoperative position to a position from which the gas may be discharged most efficiently. The rotation of the horn andv conduit will of course rotate the cam shaft. The rotation of the cam shaft will move the cut-out portion of the shaft over the stem and permit it to rise due to the pressure of the gas in the container on the valve proper. When the valve proper has been raised from its seat the gas escapes past the valve seat into the chamber II, through the port 3I, into the bore of the plug, through the bore 20 of the stem, through the slot 32, to the space surrounding the cam shaft, through the port 42 into the conduit 3, and out through the horn 4 to the atmosphere.

If the container is subjected to high temperatures when it has been charged the pressure of the gas Will rise in proportion to the rise in temperature. If this pressure becomes excessive so that there would be a tendency of the container to burst it is necessary for the sake of safety to provide a means to relieve the pressure in the container. In the present invention this is accomplished by the frangible disc 24 Which is adapted to rupture When the pressure reaches a predetermined maximum. When this occurs the gas can then escape through the conduit and horn to the atmosphere as previously described.

It is obvious that if it is desired to stop the iiow of gas from the container While it is being discharged after having released the stem I9 by rotating the cam, the horn and conduit need only be rotated toward the side of the container opposite to the side on Which the horn is ordinarily clipped when the extinguisher is not in use. By referring to Figure 2, it will be seen that the upper edge of the cam surface will then bear on the top surface 34 of the stem I9 and push it down upon further rotation of the conduit, thus reseating the valve on its seat. Of course, if it is desired, the cam surface may be designed in such a manner that it Will be possible to push the valve down on its seat by merely rotating the horn and conduit back to the position Where the horn is held by the clip.

The valve illustrated in Figure 5'is Very similar to the valve illustrated in Figure 2 and accordingly the valve Will not be described in detail. It should be noted that an alternate stem I9 and valve proper has been shown. In this valve instead of providing a valve plug 23 to carry the gasket 25 and the frangible disc 24 the stem has been extended and is provided with an enlarged portion 44 in which the gasket and disc are secured. A flange is formed on the stem in order to provide the shoulder 26 which is used as a stop, bearing against the shoulder 21. The only other difference in the valves being the means of discharging the gas from the valve.

In the valve of Figure 5 a discharge passage 45 is provided at the top of the bonnet I4. The Wall surrounding the passage is threaded externally to receive a discharge conduit or hose and is threaded internally to receive a bushing 41. The

bushing has a passage 43 leading to a closed end 49. Diametrically opposed ports are drilled in the bushing and serve to permit communication of the passage 46- with the conduit when it is attached or the external atmosphere when the conduit is disassembled from the valve.

The cam shaft 33 is mounted in a slightly different manner from that illustrated in Figure 3 and may be best understood by reference to Figure 6. The cam shaft has one end which extends through one Wall of the bonnet I4, and is secured to the handle by means of a pin a. Part 5I of the cam shaft is made of a smaller diameter than the remainder. This portion of the shaft is journalled in a bushing 52 Which is secured to the bonnet I4 by the threads 53. The other end 54 of the shaft is directly journalled in a recess in the wall of the bonnet I4.

The valve releasing handle 55 has one arm 56 securely attached to the cam shaft and the other arm 5l is supported by a screw member 58. This member has threads 59 which coact with similar threads on the handle. The end 60 of this member is journalled in a recess formed in the Wall of the bonnet. By turning the screw member in toward the bonnet the arm 5l will be moved away from the bonnet I4 and cause the other arm 56 to secure the cam shaft 33 in the bonnet I4. This means alsokeeps the handle 55 securely on the shaft.

The operation of this valve is very similar to the operation of the previously `described valve. The only diiTerence lies in the method of rotating the cam shaft so that the pressure of the gas in the container may raise the valve from the valve seat. In this instance the handle 55 is raised which will rotate the cam shaft and release the gas so that it may fiovv out through the passage 46.

The valve Which is illustrated in Figure is a valve that is particularlyadapted for use on aeroplanes. It may be employed, for example, with an aeroplane re extinguishing apparatus, or with an aeroplane flotation system which is employed when a plane lands on a body of Water to oat the aeroplane on the Water and facilitate rescue. In fact this valve is employed Wherever it is necessary to lead the gas away from the immediate Vicinity of the gas container When the gas is discharged from the container due to the pressure of the gas in the container being greater than the container can safely withstand. This condition. arises most frequently on aeroplanes where itis important that the gas be discharged at a point outside the fuselage to obviate the possibility of smothering theoccupants of the aeroplane when the container is so discharged.

The method `of relieving the pressure in the container When the temperature rises is accomplished in this valve by means of the passage 5I which is placed below the seat lf2 and extends into the passage 8. Accordingly the safety disc 24 is removed from the plug and placed in a recess formed in the valve body at one end of the passage Eel. This recess .has a shoulder 62 on which rests an annular gasket S3 which in turn supports the disc 24. Threads Se are provided in the valve body adapted to secure the bushing G5 thereto. The bushing maintains the disc 24 on the annular gasket t3 in a manner that prevents passage of any gas from the container until the disc has been ruptured. The bushing 55 is similar tc the bushing lil and is accordingly provided With a passage E55 leading to a closed end 5l. Near the closed end the Wall of the bushing has holes 68 diametrically opposed and leading` to the passage 66. "f

Threads 69V are provided `on the bushing to permit a coupling 'I0 to be mounted thereon. This coupling is necessary in order to a1low:the

connection of a conduit thereto in order to lead the escaped gas from the container to a point outside the plane or to an indicator whereby the escape of the gas can be noted. These connectionsi are not shown since they form no partgof the present invention. i

The valve plug 23 usedon the valve of Figure 7 is slightly different from that employed on the other two valves which are shown. Since the safety relief passage El is yprovided the valve seatingmaterial 'Il may be made of a solid piece and mounted directly on the valve plug without the interposition of a safety disc. The plug has a wall 12 which closes ol the passage 30 and on which the valve seating material rests.r

The remainder of the Yvalve is substantially the Vsame as the Valve of Figure and accordingly it is unnecessary to describe it in further'detail. The operation of the valve is also similar to the operation of the valve of Figure 5.' Thereis one difference, however, that must be noted.. lIf the pressure in the container rises over a safe pressure Vand the'container should be emptied the pressurein the passage 8 cannot escape through the passages 20 and 30 of the bonnet I4 and the valve plug 23, respectively. It therefore can only enter the passage 6i and rupture the frangible disc 24and escape through whatever means are provided at the end 4of the passage. It will thus be seen that a different form of a safety relief has been provided.

Although the invention has been described with reference to several specific embodiments thereof, the invention is not to be limited to those particularV embodiments since 'various modifications in details and arrangements of the parts may` be made by those skilled in the art without departing from the scope of the invention as defined in the appended claims.

We claim: Y

1. A valve assembly comprising a body having a chamber, a seat in the chamber, closure means for thechamber movably secured to the body, a stem adapted for movement in the closuremeans, a valve proper on the stem adapted to coact with the seat, valve controlling means mounted on said closure means having a releasing and a nonreleasing position associated with said stem, whereby the valve proper may engage the valve seat when said valve controlling means is in its non-releasing position and the closure means is moved toward the seat and whereby the valve proper mayV disengage the seat when said valve controlling means is in its releasing position, a passage in the stem communicating with the chamber, and a discharge outlet associated with the closure means and communicating with said passage, whereby upon release of the stem the fluid controlled by the valve may escape through the passage to the discharge outlet.

2. A valve assembly comprising a body having a chamber and a seat therein, a bonnet movably secured. to the body, a stem in the bonnet adapted for movement toward and away from said seat, a valve proper on the stem adapted to engage the seat, a valve controlling means mounted on the bonnet having a releasing'and a non-releasing position, a handle operatively controlling said valve controlling means, whereby the valve proper may engage the valve seat when said valve controllingmeans is in its non-releasing position and vthebonnet is moved toward the seat and whereby the 'valve proper may disengage the` seat when said valve controlling means is in its releasing position, and means to effect discharge of the iiuid controlled bythe valve proper comprising axpassage through the stem in communication with the chamber, and a discharge outlet onv theY bonnet vin communication with said Y3.V A valve vassembly comprising a body having a seattherein, a bonnet on thebody above the seat adapted for movement with respect to the body, a stem adapted for movement within the bonnet toward and away from the seat having a valve proper, a valve control member mounted on the bonnet adapted to engage and disengage the valve stem,.whereby the valve proper may engage the seat whenthe valve control member is in its engaging position and the bonnet is m-oved toward the seat and whereby the valve proper may disengage the seat when the valve control member is in its disengaging position; and means `to effect discharge of the fluid con-1 trolls-d by the valve proper upon developmentV of a predetermined pressure in the fluid vcornprising a passage extending through the valve stem and the valve proper and communicating withY a dischargeloutlet, and a frangible disc normally closing said passage and adapted to rupture vat a predetermined pressure.

4. A valve assembly -comprising a body having a seat therein, a chambered valve controlling member movable with respect to the body, a valver stem adapted for movement within the chambered valve controlling member toward and away from said seat, a valve proper on the stem adapted to coact with the seat, a second valve controlling member mounted on the chambered valve controlling member and adapted to engage and vdisengage the valve stem; the valve proper being adapted to be seated by movement of the chambered valve controlling member in a direction toward the valve seat whenthe second valve controlling mem-ber engages the valve stem, and the valve being adapted to open upon movement of the second valve controlling'member toits disengaged position; and means to effect discharge of the uid controlled by the valve comprising a passage in said valve stem in communication with a chambered portion of the chamberedrvalve controlling member and extending adjacent the valve proper, a passage establishing communication between the first named passage and the space adjacent the valve seat, and `a discharge koutlet in communication with said chambered portion of the chambered valve controlling member.

5. A Valverassembly comprising a body having.

a seat therein, a chambered valve controlling member movable with respect to the body, a valve stem adapted for movement within the chambered valve controlling member toward and away from said seat, a valve proper on the stem adapted to coact with the seat, a second valve controlling-member mounted on the chambered valve controlling member and adapted to engage and disengage the valvestem, an operating member operatively connected with the second Valve controlling member; the valve proper being adapted to be seated by movement of the chambered valve controlling member in a direction toward the valve seatV when the second valve controlling member engages the valve stem, and the valve being adapted to open upon movement of the second valve controlling member to its ldisengaged position; and means to effect discharge of the uid controlled by the Valve comprising a passage in said valve stem in communication with a chambered portion of the chambered valve controlling member and extending adjacent the valve proper, a passage establishing communication between the first named passage and the space adjacent the valve seat, a passage in said operating member, and a passage establishing communication between the last named passage andsaid chambered portion of the chambered valve controlling member.

6. A valve assembly comprising a body having a seat therein, a chambered valve controlling member movable with respect to the body, a Valve stem adapted for movement within the chambered valve controlling member toward and away from said seat, a valve proper on the stem adapted to coact with the seat, a second valve controlling member mounted on the chambered valve controlling member and adapted to engage and disengage the valve stem'; the valve proper being adapted to be seated by movement of the chambered valve controlling member in a direction toward the valve seat when the second valve controlling member engages the valve stem, and the valve being adapted to open upon movement of the second valve controlling vmember to its disengaged position; and means to effect discharge of the uid controlled by the valve upon the development of an excessive pressure in the fluid comprising a passage in said valve stem in communication with a chambered portion o1" the chambered valve controlling member and extending through the valve proper, a frangible disc adapted to give way at a predetermined excessive pressure in the fluid arranged to normally close off said passage, and a discharge outlet in communication with said chambered portion of the chambered valve controlling member.

7. A valve assembly comprising a body having a seat therein, a valve proper, a valve stem, a valve controlling member having releasing and non-releasing positions adapted to hold the valve on its seat in its non-releasing position and to permit the valve to rise in its releasing position, anV operating member operatively connected with the valve controlling member, and means to eiect discharge of the fluid controlled by the valve comprising a passage in said valve stem extending adjacent the valve proper, a passage establishing communication between the rst named passage and the space adjacent the valve seat, a passage in said operating member, and a passage establishing communication between the first and last named passages.

8. In a valve assembly comprising a body having a seat, means movable toward and away from the seat, movable valve means in the first named means adapted to coact with the seat, rotatable means on the rst named means having an engaging and disengaging position with respect to said movable valve means, said movable valve means being held on the seat by the first named means and said rotatable means in its said engaging position, means to effect passage of a fluid medium through the movable valve means into the first means, and discharge means on the rst named means secured to said rotatable engaging and disengaging means to move it from one position to the other.

9. In a valve assembly comprising a body havinga chamber therein, a seat in the chamber, a bonnet closing the chamber adapted to move toward and away from the seat, a stem movable in the bonnet toward and away from the seat and having a head adapted to coact with the seat, a cam on the bonnet having engaging and disengaging positions with respect to the stem, said stem having a passage communicating with the chamber and the bonnet, a discharge conduit in communication with the bonnet and associated with the cam to move it tol engaging and disengaging positions, whereby the head may be held on the seat by the bonnet and the cam when in its said engaging position, and upon movement of the cam to a disengaging position a medium controlled by the valve may escape through the stem passage to the discharge conduit.

10. In a valve assembly comprising a body having a chamber and a seat therein, a bonnet movable toward and away from the seat, a stem in the bonnet movable with respect thereto and having a head adapted to coact with the seat, a cam on the bonnet having engaging and disengaging positions with the stem, said bonnet and said cam when in its said engaging position serving to hold the head on the seat, said stem having a passage communicating with the chamber and the bonnet, and a discharge conduit adapted to communicate with the bonnet and secured to the cam to move it from engagingk and disengaging positions.

11. A valve assembly comprising a body having a seat therein, a valve proper, means adjustable with respect to the valve body, valve controlling means carried by said adjustable means and having releasing and .non-releasing positions and adapted to hold the valve proper on its seat in its non-releasing position and to permit the valve proper to rise from the seat in its releasing position, said adjustable member having a range of adjustment such that movement thereof in a direction toward the valve seat when the valve controlling means is in its non-releasing position will cause the valve proper to engage the seat, and means for maintaining a fluid tight relationship between the valve vbody and the adjustable means throughout the range of adjustment.

12. In -a valve assembly comprising a body having a chamber and a seat therein, a bonnet movable toward and away from the seat, a valve stem in the bonnet movable with respect thereto and adapted to coact with the seat, a controlling member on the bonnet having engaging and disengaging positions with the stem, said bonnet and said controlling member when in its said engaging position serving to hold the valve head on the seat, said stem having a passage communicating with the chamber and the bonnet, an operating member for said controlling member having a passage constituting a discharge passage, and means to secure said operating member to 4said controlling member including means to establish communication between said bonnet and said discharge passage.

13. A release device for a fluid medium under pressure comprising a valve body formed with a seat, a bonnet cooperating with the valve body and formed with an outlet, a valve stem mounted for longitudinal movement in the bonnet and formed with a head adapted to coact with the seat, means normally engaging the valve stem to hold the valve head on the seat and adapted to be moved to a non-engaging position to per- .mit the valveto be openedfby the pressure of 1, the iiuid medium, and means establishing communication between the spaceadjacent the seat ,and `the outlet including Ya passage through the valve stem. Y Y t Y 14, A release device for aV fluid medium under pressure comprising arvalve body formed with a seat, abonnet cooperating withthe valve body and formed with an outlet, a valve stem mounted Vfor longitudinalmovement in the bonnet and formed with a head adapted to coact withthe ,seatVmeans normallyA engaging the Valve stem `to hold the .valve head on the seat and adapted to be moved to a non-engaging position to permit` the `valve to be opened by the pressure of -theiiuid l medium, means Yestablishing communication between the space adjacent the seat and the outlet including a passage through the valve stem, said valve head having a passage therethrough communicating vwith the passage in the valve stem, and a frangible disc normally Yclosing the second named passage and adapted to rupture upon the development of a predetermined excess pressure of the fluid medium. n 15. A releasedevice for a uid medium under pressure comprising a chambered body member, a seatY in said chamber, closure means for lsaid chambered body member having a fluid discharge outlet adapted for connection to a dis` charge conduit, Va fluid controlling member disposedY within said closure means and adapted for movement toward and away iromthe seat and havingra portion arranged to engage said seat, means establishing communication between the chamberedbody member and the discharge outlet including a passage inthe fluid controlling member,- the passageuin said viiuid .controlling membervbeing extendedr for communication through Vthe seat engaging portion of said uid controlling member,l and frangible means normally closing said passage and adapted to rupture upon the development of a predetermined excess pressure of the liuid medium.

v i6. A releasedevice for a fluid medium pressure comprising a body member having a chamberandk a seat therein, closure means, for said body member movable with respectthereto, afluid/controlling member disposed within 'said closure means and adapted for movement Q toward'and away from the seat, saidfluid conunder vtrolling member being provided with a passage communicatingA with the chamber and thefclosure means, releasableY means having engaging vand non-engaging positions with respect to said iiuid controlling member, an operating member for said releasable means having a passage conv,stitllting a discharge passage, and means to secure saidoperating member to said releasable means including means to establish communication between said closure means andv said dischargepassage. -l Y c.

V17,'A release device fora fluid medium under pressure comprising a body provided with a chamber having a seat therein, closure kmeans for said Vbody movable with respect thereto, a fluid controlling member disposedr within said closure means and adapted to move toward and away from the seat, said fluid controlling member being provided with a passage communicating with the chamber and the closure means,

rotatable means bearing over a portion ofits length in the closure means and formed over another portion of its length with a surface having engaging and non-engaging positions with respect to said uid controlling member, an operating member for said rotatable means having aY passage constituting a discharge passage, and means to connectsaid operating member to said rotatable means including means to establish communication between said closure means and said discharge passage. y

18. A release device for a iiuicl medium under pressure comprising a bodyv provided with a chamber having a seat therein, closure means for saidbody movable with respect thereto, a

fluid controlling member disposed Within said closure means and adapted to move toward and away Vfrom the seat, said iiuid controlling member being provided with a passage communicating with the chamber and the closure means, rotatable means mounted in said closure means andformed with a surfacerhaving engaging and non-engaging positions with respect to said iiuid controlling member, and means to preventrotation fof gthe fluid controlling `member with respect to the closure means, said closure means being provided with a discharge outlet. I

. GEORGE W. REPLOGLE.

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