US2579387A

US2579387A - Feed drain and safety device for water heaters

Info

Publication number: US2579387A
Application number: US770694A
Authority: US
Inventors: Bozec Leon Le; Gautier Georges
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-10-02
Filing date: 1947-08-26
Publication date: 1951-12-18
Anticipated expiration: 1968-12-18

Description

Dec. 18, 1951 L. LE BOZEC ETTAL 2,579,387

FEED DRAIN AND SAFETY DEVICE FOR WATER HEATERS Filed Aug. 26, 1947 s Sheets-Sheet 1 Dec. 18, 1951 1.. LE BozEc ETAL FEED DRAIN AND SAFETY DEVICE FOR WATER HEATERS Filed Aug. 26, 1947 3 Sheets-Sheet 2 1951 L. LE BOZEC ETAL 2,579,337

FEED DRAIN AND SAFETY DEVICE FOR WATER HEATERS Filed Aug. 26, 1947 3 Sheets-Sheet 5 trol shaft and said inlet valve.

Patented Dec. 18, 1951 UNITED STATES PATENT OFFICE FEED DRAIN AND SAFETY DEVICE roa WATER HEATERS Application August 26, 1947, Serial No. 770,694

In France October 2, 1946 v 4 Claims. (01. 27720) The object of our invention is a feed, drain and safety device adapted to be used in a waterheater and which is intended to be inserted between said water-heater and the water inlet ductor pip Ou'rdevice comprises a water inlet valve and a water outlet valve which valves are both controlled by means of a common shaft adapted to carry out a combined. translational and rotational movem'entdueto the provisionof a lug engaged in a slot the pitch of which,with reference to the said shaft varies from one end to the other end of said shaft.

' According to apreferred embodiment the'locking of theinlet valve is obtained by means of an adjustable stop-screw, inserted between the con- Our invention will behest understood with reference to the annexed drawings in which we have illustrated a number of embodiments of the said invention, and in which:

Figs. 1 to '7 show a first embodiment, Figs. 1 and 2 being vertical sections along two planes at right angle one to the other, and showing the parts in the respective positions corresponding to the blocked condition of the inlet valve Figs. 3 and 4 being views similar to Figs. 1 and 2 but corresponding to the normal unblocked position of the inlet valve, Figs. 5 and 6 being similar views, corresponding to the drain position and Fig. 7 showing on a larger scale the slot used to guide the control shaft of the device.

Fig. 8 shows a modification relating to the adjustment of the outlet pipe. a V

Fig. 9 shows in vertical partial cross-section a modification in the adjustment of the said outlet pipe, and

Fig. 10 shows in axial cross-section a device in which the'adjustment of the inlet valve, is

obtained by means of a screw adapted to be operated fromthe outside ofthe'device. I a The device shown in Figs. 1 to '7 comprises "a body I provided with three externally threaded pipe-stubs of which ,stub 2 is to be connected with the waterinlet pipe, stub 3 is to be connected with the'water'heater to be fed and stub 4 is to be connected with an outlet pipe.

On body I is fixed by means of screws 5 an outer flange of a sleeve 6 in which there is r mounted a shaft 1 provided with a packing-box 8 and controlling hand-wheel 9. Said handwheel Sis provided with a pointer I I, the end of which is adapted to be movedgona scale..I2.

Shaft I is adapted to slide axially as well as to rotate within sleeve 6. For such purpose the said shaft'is' provided with a lug l3 cooperating with a guide-slot I 4 in sleeve 6. The said slot comprises part e 1 which is at a considerable angle to a longitudinal section of sleeved: Part 8 j of slot I4 is followed by another part f g of wheel 9 is rotated from 2 the same slot at a, quite low angle to a longitudinal section of sleeve 6, point 9 being located at the middle of the inclined course of lug I3. From g to h slot I4 is directed along a longitudinal section of sleeve 6. I

Inlet valve I5, located in stub 2, is urged towards its closed position by a weak spring I6 bearing on a shoulder ofsleeve 6.

The stem of valve I5 is guided within sleeve 5. A screw II carried on shaft I is adapted to engage the said valve stem. v

In stub 4 is provided a valve I9 intended to operate as a drain valve and as a safety valve. Valve I9 is integral with a stem 2| controlled by means of a cam 22 on shaft 1.

The said valve I9 is provided with a return spring 23 bearing on a threaded ring 24. Ring 24 screws in an inner thread of stub 4, due to which the calibration ofspring 23 may be adjusted by turning'ring 24. a

In order to make impossible that spring 23 be excessively compressed by operating ring 24, a circular groove 25 has been machined at the inside of stub 4 so that the upper edge of said groove acts as a stop for ring 24. Spring 23 bears on a circular disc carried by ring 24 at mid-height of said ring, in such a manner that ring 24 may be turned upside down without changing the calibration of the spring.

Such a device may be operated in the following manner:

Supposing that lug I3 is opposite point g in slot I 4. corresponding to pointer II pointing at the mark on scale I2, cam 22 and the remaining parts are in the respective positions shown in Figs. 1 and 2.

Screw II then bears on the stem of inlet valve I5, which is thus strongly pressed on its seat, so that-no water can be let in.

7 Moreover, cam 22, which is in the position shown in Fig. 2, is out of engagement with stem 2I and the outlet valve I9 is thus closed.

To bring the device into normalposition, handi the 90 position towards the 0 position. As lug I3 travels from g to f the head of screw II moves to the right side in Fig. 1 by a distance as shown at a (Fig. 7) said distance being suificient' for stopping the compression of the resilient packin of inlet valve ii.

If the movement of handwheel 9 is then carried on towards the 0 indication lug I3 travels from) to e in slot I4 and consequently shaft I and screw I1 execute in sleeve 6 an axial movement the length of which equals 12 (Fig. 7) due to which movement valve 15 is released. Valve I5 is then pressed on its seat only by the weak spring I6 and therefore acts as a free swinging valve. This corresponds to the normal position: shown in Figs. 3 and 4.

' If the water pressure in the inlet duct con- 3 nected to stump 2 exceeds the pressure inside of the water heater plus the weak pressure due to spring IE, valve is formed from its seat, which allows for the feeding of the water heater to be supplied.

In the position shown in Figs. 1 and 2 and marked 90 (lug l3 opposite point 9) if it be des ed to empty the water heater, the handwheel ii rotated towards the 180 mark, thus shifting 1 any axial progress in sleeve 6,, valve l5 remains in the closed position and cam 22 engages stem 2L, pushing it in such a manner that valve I9 is opened. This is the drain position shown'of Figs. 5 and 6 and corresponding to the 180 indication, lug I3 being then at point n.

The device being in the normal position shown in Figs. 3 and 4 (lug 13 being at pointy) if the internal pressure raises above the nominal maximum for which spring 23 was calibrated, valve 15 is strongly pressed on its :seat, while Valve I9 is opened under the .action of the said pressure, thus pressing on spring-23. Valve 19 then Operates as asafety valve and allows fora determined amount of water flowing out, which brings again the internal pressure to a normal value.

The calibration of the spring 23 of the drain valve may be obtained by any .suitable means.

For instance, a threaded sleeve 28 (Fig. 8) provided with a milled flange .29 may be used.

Moreover, instead of providing on shaft 1 a thrust screw Facting onthe inlet valve, the thrust screw I! may, as shownin Fig.9, be supported on the valve stem, the said stem being adapted to "slide axially in shaft 1;

As shown in Fig-. 10, a screw 3| may also be used, as an adjustable thrustmember, the threaded part of which is prolongated by means of a smooth rod 32 extending within the control shaft to the outside of the device, by passing through a packing-box 33. This'allows for an easy adjustment of valve 15 at any time and in any position.

The device which is the-object of our invention has the advantages of being-easily manufactured, securely operated and readily adjusted.

Our invention is not intended to be limited to the particular embodimentswshown by way of illustration and many auxiliary modifications may be used as regards the apparatus described in the scope of our invention as defined in the appended claims.

We claim:

l. A valve comprising acasing having an inlet port, a discharge port and a drain port, .a valve stem guiding sleeve extending into said casing and having an inner end disposed opposite said inlet port, a valve stem rotatably and slidably mounted in said sleeve and having an inner end, said sleeve having a slot extending about a part of its-cimumference with at least a portion thereof of helical form, a stud carried by the valve stem and positioned in said slot for imparting axial movement to said stem upon rotation thereof, a valve member slidably mounted in the inner end of said sleeve and engaged by the inner end of the stem for closing the inlet port, a spring loaded valve element closing the drain port, and a cam on said stem cooperating with the .spring loaded valve for opening the latter.

2. A valve comprising a casing having an inlet port, .a discharge port and a drain port, a valve stem guiding sleeve extending into said casing and having an inner end disposed opposite said inlet port, .a valve stem rotatably and slidably g [3 from g to h. Shaft 1 then rotates without mounted in said sleeve and having an inner end, said sleeve having a slot extending about a part of its circumference with one portion of helical form, an adjoining portion of helical form of smaller pitch and a third portion lying in a plane perpendicular to the axis of the stem, a stud carried by the valve stem and positioned in said slot for imparting axial movement to said stem upon rotation thereof, a valve member slidably mounted in the inner end of said sleeve and engaged by the inner end of the stem for closing the inlet port, a spring loaded valve element closing "the drain port, and a cam on said stem cooperating with the spring loaded valve for opening the latter, said stud and cam being so positioned relative to each other that the cam will engage the spring loaded valve when the stud is in the third portion of said slot.

3. A valve comprising a casing having an inlet port, a discharge port and a drain port, a valve stem guiding sleeve extending .into said casing and having an inner end disposed opposite said .inlet port, a valve stem member rotatably and slidably mounted in said sleeve and having an inner end, said sleeve having a slot extending about a part of its circumference with at least a portion thereof of helical form, .a stud carried by the valve stem member and positioned in said slot for imparting axial movement to said stem member upon rotation thereof, a valve member slidably mounted coaxially within the inner end of said sleeve for closing the inlet port, a light spring urging the valve member to closed position regardless of the axial position of the stem and an adjustable stop carried by one of the stem and the valve members to engage the other member to positively urge the valve member to closed position.

4. A valve comprising a casing having an inlet port, a discharge port and a drain port, a valve stem guiding sleeve extending into said casing and having an inner end disposed opposite said inletport, a valve stem rotatably and slidably mounted in said sleeve and having an inner end, said sleeve .havinga slot extending about a part of its circumference with at least a portion thereof of helical form, a stud carried by the valve stem and positioned said slot for imparting axial movement to said stem upon rotation thereof, a valve member slidably mounted in the .inner end of said sleeve for closing the inlet port, a light spring urging the valve member to closed position regardless of the axial position of the stem and an adjustable stop carried by the inner end of the stem for engaging the valve member to positively urge the latter to closed position, and having an actuating head extending axially through the valve stem to the exterior .of said casing.

LEON LE .BOZEC. GEORGES GAUTIER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS France Aug. 5,1935