US1152733A - Safety-valve. - Google Patents

Description

A. M. HOUSER.

SAFETY VALVE.

APPLICATION FILED ocT.14. Isla.

Patented Sept. 7, 1915.V

i Tol all whom t may concern 'l ARTHUR M. HOUSER, OI CHICAGO, ILLINOIS, ASSIGNOR T CRANE COMPANY, rOIE CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

n' srnrns ATENT onirica.,

SAFETY-tuve.

lvspeuicationof Letters Batent. l

ratentedsept. 7,1915.

` Application led October 14, 1918. Serial N o. 795,135.

i Be it known that I, ARTHUR M. I-IoUsEn, a citizen of the United States, and a resident of Chicago,"in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Safety-Valves,

4of which the following is a full, clear, and

exact description.

My invention relates to the class of safety v valves, and more particularly to that form of valve known in the art as pop safety valves. t

One object of my invention is to provide an improved means for regulating the pop adjustment in a valve of this character,

which is designed to be conveniently and easily regulated by the operator, and positioned therein to incase and protect the valve springs from the action of the steam and at the same time where it cannot be rendered inoperative by scale, etc. Another object of my invention is the provision in such a valve of regulating means affording the greatest possible range of adjustment in set pressures and which by its simplicity and consequent cheapness of manufacture reduces the cost over existing types. My invention further contemplates a novel construction and arrangement of a pop regulating means which is adapted to maintain the least waste of steam between the opening and closing points; and which further permits the valve to Abe made to` gages.

My invention' also contemplates certain vnovel details of construction, combination and arrangement of parts of the improved device, whereby certain important advantages are attained, as will be more fully described hereinafter, and pointed out in the claims. i

The foregoing, together with such other objects as may hereinafter appear, orare struction, and

pop or huddling chamber into which the steam expands, sothat the pressure tending .to lift the main valve is greater afterv the valve. has left its seat than before, in this manner compensating'for the increased tension of the main valve spring which is a resultant from its further compression when the-main valve lifts. Means have also been prov1ded 1n this connection to relieve the pressure 1n the huddling chamber.

This present invention is more particularly directed to novel construction of pop valve to promptly close at a point when the pressure in zthe, boiler is sufficiently reduced.

In the drawings, the numeral 3 indicates the casing of the` safety valve which is tapped at its lower end for connection `with the boiler, and at one side for connection with a pipe through which the waste steam passes for discharge at a point distant from the casing. The lower inner portion of the casing is formed to receive the fianged valve seat 4, the opening therethrough being controlled by the mainvalve 5, which is held closed on its seat against pressure in the boiler by the main valve spring 6, whose upper end takes against the screw pressure plug 7, adjustment of which in thepyoke 8 varies the pressures at which the valve may be set. The above is a conventional consired.

diametered intermediate portion '9, and its upper end above this portion is-interiorly threaded as at 3 to receive the pop regulator A which penetrates downwardly into the casing. The said regulator comprises a ring portion 10 disposed within and spaced away from the larger diametered portion of the casing, which portion 10 tapers outwardly at its upper end 10 where `it is exteriorly threaded to. screw into the `the interiorly threaded portion 3 of the casing. The said regulator extends downmay be varied from if de' The casing 3 is provided with the larger wardly to overlap the outwardly extendingvalve seat flange 4 which rests'upon the shouldered and smaller diametered ortion 3 of the casing, and at a suitable distance short of its loweredge I form a series of ports 11 in its wall and short of the lip 12 which forms the lower terminal thereof.

To increase the area of resistance to the upward pressure of -the steam when the main valve initially lifts, the valve 5 is provided with a laterally extended rim portion 5 which overhanges the s'eat flange 4a but is spaced away therefrom to form the hurldling chamber 13, and is perforated to provideorifices 5 which extend to the upper face of the valve. Resting upon this upper face is an imperforate auxiliary valve 14, for which the main valve acts as a seat, and fitted upon the main valve 5 as to close the orifices 5 when it is down. It is held in contact with the valve 5 b'y the spring 15 v whose uppe'r end takes against the nut 16 Vas q:at

which is fast on the valve.

By a reference to Figure 2 it will be seen that the lip 12 also overlaps the vertical outer face of the valve extension 5'thus aiding to confine the steam in thehuddling chamber 13. The degree of lap is decreased, or increased, by imparting a turning movement to the regulator in the casing to obtain a greater or lesser clearance between these members when the valve lifts. This variation in lap relation is obtained by manipulating vthe upper portion 17 which projects sufliciently from the casing interior to permit ready access thereto through the opening intermediate the arms of the yoke member 8. The numeral 18 represents a lock nut on the casing in engagement with teeth formed on the upper portion 17, so arranged that when the regulator is properly adjusted the lock nut is secured by the set screw 18a, in order to prevent unauthorized tampering with the regulator.

It will be noted that the ring 10, which with the intermediate portion 9 of the casing forms the steam exit chamber 19 communieating with the discharge side of the valve, also mcasesthe springs 6 and 15 against the action of the steam; and with this end in view I further provide the auxiliary valve 14 with a flange 14a which has a working fit in the ring and normally extends upwardly past the ports 11 to shut oif any escape of steam therethrough from the chamber 19. 1

One of the advanta es incident to my invention is the capa ility of easy assemblage of the component parts, which are few in number, and in this connection it will be apparent that the valvular mechanism may be readily removed out of the regulating sheath 10 upon the uncoupling of the yoke member8, and which may be as readily replaced.

, With the parts in position as shown, the operation fis substantially as follows: When the steam pressure rises beyond the oint to which the valve is set, the latter llfts and the escapin steam ex ands in the huddling chamber, w ich in e ect-provides a larger area of resistance t0 compensate for the increased tension of the main valve spring. As the main valve lifts the extent of lap between the rim 58L and the lip 12 diminishes until there is a clearance for the escape of steam through the ports 11 to the discharge side of the valve casing. The steam entering the orifices 5 raises the auxiliary valve 14, there being thus provided an additional outlet for the escape of the steam, which cannot act upon the already incased springs as the ports are closed in the manner already described.

This arrangement also insures the prompt closure of the valve upon the fall of the steam to the set pressure, whether the valve be set for a high or low4 pressure. The resistance of the valve to closure is diminished f by the rising of the auxiliary valve, and on closing, the huddling chamber and lip 12 of the regulator coperate to confine the steam and cushion the main valve in its downward movement without chattering or hammering. By manipulating the regulator the degree of lap and clearance may be increased or decreased as desired to'regulate the area for the escape of the steam and the area .of resistance to the upward pressure of the steam, thereby to maintain the least waste of steam between thev opening and the closing points.

From the foregoing the essential features, elements and operation of the device, together with its simplicity and other advantages thereof, will be clearly apparent to.

those skilled in the art.' y l Having thus described my invention, and illustrated its use, what I claim as new and desire to secure by Letters Patent, is thefollowing 1. In a safety valve, the combination of a body member having inlet and outlet openings Aand an upper open bore disposed vin substantial alinemeut with the inlet opening, the latter bein provided with asea't, a

pop valve mechanism depending from the 2. In a safety valve, the combination of a valve body having inlet and outlet openings and comprising a casing provided with a seat and a bore located vabove said seat, a pop valve mechanism depending from the bore to the seat and presenting dissimilar areas to the pressure when seated and unseated, and a pop regulating means therefor adjustably mounted in said casing and comprising a tubular member' having its lower portion normally disposed lin a lap relation with that part of the valve presenting the greater area to the pressure, the diameter of the bore being slightly greater than that of the said valve part, said member having its upper portion disposed in said ybore for its ready manipulation to vary the lap with said mechanism.

' 3. In a pop safety valve, the combination of a casing provided with a seat and an up- 'per bore, a pop valve mechanism extending downwardly through the bore to said seat,y

and a pop regulating means therefor adjustably mounted in the casing and normally inl a lap relation with the said mechanism, said means comprising a valve inclosing sheath member having an outwardly projecting upper portion extending through said bore whereby the sheath may be manipulated thereb to vary the lap, substantially as describe 4. In a pop safety valve, the combination of a casing provided with a seat and an upper bore, a pop valve mechanism extending downwardly through the bore to said seat, a pop regulating means therefor adjustably mounted in the casing and normally in a lap relation with the said mechanism, said means comprising a valve inclosing sheath member having an outwardly projecting upper portion extending through said bore whereby the sheath may be manipulated thereby to vary the lap, and a lockino means engaging said extending portion to lock the sheath in an adjusted position. Y

5. In a pop safety valve, andin combination, a casing provided with a seat and an upper bore, a pop valvemechanism comprislng a main valve on the seat having an apertured circumferential rim portion and an auxiliary valve seated thereon, and a `pop regulating 'means comprising a valve inclosin ysheath mounted in the casing to have its ported lower end in lap relation with said auxiliary valve and rim portion torf provide a double exit for the pressure y when these members'are lifted, said sheath having its upper pportion extended beyond the bore to provide `for its direct manipulation to vary the' lap with said mechanism.

6. In a safety valve, the combination of a casing having an inlet and a seat therein and provided with an'upper open bore and .a lateral outlet intermediate the upper bore and said inlet, a pop valve mechanism in operative relation with said seat, and a pop regulating means therefor in lap"\relation the bore to vary the lap relation with said mechanism.

7. In a pop safety valve, thev combination of a casing provided with la seat and having at its upper end an o ening, a pop valve mechanism depending rom said opening to lthe seat and comprismg 'a main valve havmg an apertured rim port1on and an auxiliary valve seated thereon to form one boundary of a blow-back chamber at the rim, and an adjustable pop regulating means forming another boundary of the blow-back chamber comprisinga ring-like member having its ported lower end in lap relation with sald mechanism to provide through said ported lower end anexit for the vpressure when the main and auxiliary valves are lifted, said member having its upper portion disposed in said' opening for its adjustment to vary the lap with said mechanism.

In testimony whereof -I have hereunto signed my name in the presence of the two subscribed witnesses.

ARTHUR M. HOUSER.

Witnesses:

M. W. LINK,

F. T. DoNoHUE.

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