US739994A - Water-level indicator. - Google Patents

Description

PATENTED SEPT. 29,1903.

. J. DEWRANGE &`G. H. WALL.

WATER LEVEL INDICATOR.

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TN: Nunms PETERS co; wmaumo. wAsmNumn. n cv No. 739,994. Y PATNTED SEPT. 29, 1903.

A5 J. DEWRANGE & G. H. WALL. A

WATER LEVEL- INDICATOR.

APPLIOATION FILED MAR. 1o, 1902. v v No MoDBL. v 2 SHEETS-SEHEN.

No. '73s,994.

Patented September 29, 1903.

PATENT' OFFICE.

JOHN DEwRANcE AND eEoReE HENRY WALL, or sournwARN,

ENGLAND.

WATER-LEVEL*` INDICATOR.

SPECIFICATION forming part of Letters Patent No. 739,994, dated September 29,1903.

' Application led March 10, 1902. Serial No. 97,575. (No model.)

of Great Britain and Ireland, residing at 165 Great Dover street, Southwark, in the county of Surrey, England, have invented new and useful Improvements in the Construction and Working of Water-Level Indicators for Steam-Generators and the Like, of which the following is a specication. Y

' This invention relates to an improved method of constructing and working watergages provided with automatic valves, our ob-` ject being to enable a blow-off to be eifected through the upper arm and gage# glass and through the lower arm, respectively, at successive stages inthe complete operation of manual appliances, which may be arranged to workeither reciprocatively lor rotatively.v

The accompanying drawings illustrate various constructions of water-level indicators embodying our improvements.

' In Figures l to 5 the arrangement enablesa blow-off to be eifected through the lower and upper arms consecutively by a rotative movement of a single hand -wheel without vinterference with the shut-off valves, Fig. l being a vertical section, Fig. 2 an exterior eleva-` tion, and Figs. 3, 4, and 5 transverse sections taken, respectively, on the lines :1; y y, and

2'- z in Fig. l. Fig. 6 is a'vertical section, and Fig. 7 an elevation, of a construction which enables a blow-od to be effected by means arranged to work reciprocativel-y, Figs. Sand 9 being transverse sections taken, respectively, on the lines and yf/y, in Fig. 6. l

Water gages as commonly Y constructed comprise two arms 'adapted for attachment to the boiler-front and are furnished with cocks whereby the steam and water respectively may when necessary be shut oif. Between the two arms a gage-glass is mounted, and the lower arm is in addition provided withablowthrough cock. When it is desired to provide against the escape of steam or water in the event of the gage glass bursting or being broken, one arm or each arm is furnished with a ball-valve, which under normal conditions isk oif its seat, but which upon fracture of the gageglass instantly seats itself andintercepts the escape of steam or other iiuid under pressure. When using awater-gage of this description,it isnecessary when blowing through the upper arm andgage-gla'ss not simp y to close the cock in the lower arm and open the blow-through cock, but to adopt some means for preventing the ball-valve at the upper end ofthe gage-glass seating or for displacing it if seated.

It has been proposed to construct waterlevel indicators having an automatic valve both in the upper and inthe lower arm and provided with unseating appliances arranged in such a manner that at successive stages in a complete operation of the blow-off mechanism a blow takes place through the normal working passages in thelower and in the upper arms, respectively.

` According to our improved method of construction instead of manipulating the automatic valve in the lower arm so as occasionally to hold it off its seat we arrange this valve so as to be permanently automatic, andV we lit the same arm with a supplementary valve, which serves to open or to close the water-passage between the boiler and the lower gage-glass holder. the gage-glass is furnished with an automatic valve, arranged in conjunction with an antiseating or an yunseating appliance, which may be either rotative or reciprocative in its action, but which in any case forms part of or is in connection with the directing-valve pertaining to the lower arm. The blow-off mechanism may assume the form of a rotative spindle or rod A, which in the lower arm is arranged as a two-way cock a and in the upper arm as an automatic-valve carrier a, formed as a valve unseating or antiseating appliance. Referring to Figs. l to 5, the cock a in one position ofthe rod A opens communication withl the boiler through the bore or passage b2 of the lower arm and the longitudinal passage C415 and lateral outlet-passage als to the blow-off orifice al". In another position of the said rod communication is opened with the boiler byway of the gageglass and bore or passage b3 of the upper arm. The ports through which communication is established will, however, be readily comprehended without further reference to the drawings. f

The upper arm of In view of the desirability of rendering the position of the mechanism more apparent at a glance the blow-o mechanism may be arranged upon the reciprocative principle and be worked by means of a hand-lever, the normal position for which is well defined.

A waterlevel indicator oi' the kind last above referred to is illustrated in Figs. G to 9. The directing-valve in the lower arm may assume the form of a cylindrical rod A,formed with one through-passage a2 for communicating directly between the boiler and the lower gage-glass holder, a lateral recess ai for communicating between the boiler and a chamber 11X, a second lateral recess a4 for communicating between the lower extremity of the gageglass and the chamber 11X, and, finally, a longitudinal passage a5, having a lateral inlet a6 and a terminal outlet a7 to the blow-ofil oriice as It will be seen that by causing the rod A to assume certain positions the blow-off oriiice as is placed in communication with the boiler either through the lower arm or through the gage-glass and the upper arm. The directingvalve and the blow-through cock may, however, be arranged as separate devices and connected together in any convenient manner for the purpose of combined action. The automatic valve a is preferably supported in the chamber aw by means of ledges a, afin ger am in the chamber d10 assisting the exit from the said chamber of the ball a9 upon the withdrawal of the plug cl3. The unseating or antiseating appliance in the upper arm may consist of a spindle or stem a', working through a stuing-box a0 and serving either to unseat the automatic valve ax or to prevent its seating when it is desired to eiect a blow-oli through the upper arm and gageglass. A suitably-mounted hand-lever C is arranged at some intermediate point between the upper and lower arms. This lever in the construction illustrated is pivoted in the upper end of a link C, the lower end of the latter being pivoted in a lug C2, formed on the lower arm. The lever is connected, by means of the stud C, with the rod A, the spindle or stem a, comprising the unseating or antiseating appliance, being attached to the upper extremity of the rod A by means of the stud am. v

The operation is as follows: Upon lifting the hand-lever C the first effect is to carry the through-passage a2 in the rod A past the bore b2 of the lower arm and open communication with thc chamber b and the lower arm by way of the lateral recess a3. rlhe lateral inlet c being now open to the chamber bX a blow through the lower arm. is effected. As the hand-lever C is moved to its extreme position (upward) the communication with the boiler through the lower arm is closed, the full portion of the rod A beneath the lateral recess a3 coming opposite the bore b2, which leads to the boiler. Communication with the latter is, however, opened by way of the lateral recess a4, the gage-glass, and the bore bf in the upper arm. The automatic valve (LX will now assume the position shown in dotted line'in Fig. 6, wherein it is held by the spindle a.

If the apparatus be inverted, what has been referred to as the lower arm becomes the upper arm, and vice versa.

What we claim as our invention, and desire to secure by Letters Patent, is

l. A water-level indicator having upper and lower arms for communicatingwith the steamgenerator or other vessel provided as to its upper arm with an automatic valve and with an appliance adapted for temporarily preventing the said valve seating, and provided as to its lower arm with an automatic valve and with a controlling-valve adapted for opening communication between the boiler and the blowod, first through the lower arm, and secondly through the upper arm and gage-glass, whereby at successive stages in a complete operation of the apparatus, a blowoff is effected through the normal working passages in the lower and upper arms respectively, substantially as herein described.

2. A Water-level indicator having upper and lower arms for communicating with the steamgenerator or other vessel provided as to its upper arm with an automatic valve and with an appliance adapted for temporarily preventing the said valve seating, and provided as toits lower arm with an automatic valve and with a controlling-valve adapted for opening communication between the boiler and the blowoff, first through the lower arm, and secondly through the upper arm and gage-glass; the two-way controlling-valve inthe lower arm and the valve-antiseating device in the upper arm being coupled together for joint manual operation and in such relation to one another that, at successive stages in a complete operation of the apparatus, a blow-oil" is eected through the normal working passages in the lower and upper arms respectively, substantially as herein described.

3. In an automatic-valve-tted water-level indicator, the herein-described means for controlling communication between the boiler and the blow-olf, same comprising a cylindrical rod formed as a two-way valve in the lower arm and as an unseating or antiseating appliance in the upper arm in combination with means for operating the saidrod; the whole being arranged in such a manner that,

at successive stages in a complete operation IIO passage with a lateral outlet and, as to the upnames to this specification in thevpresence of per arm, as an automatic valve-carrierformed two subscribing Witnesses. e as avalve unseating o1' antiseating appliance, and provided at its outer extremity with a ALL 5 hand-Wheel or equivalent meanswhereby a T rotative movement maybe imparted to the Witnesses: said rod, substantially as set forth. PERCY E. MATTOCKS,

In testimony whereof We have signed our S; M. ROWSELL. v

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