Search Images Maps Play YouTube Gmail Drive Calendar More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS522995 A
Publication typeGrant
Publication date17 Jul 1894
Filing date18 Jul 1893
Publication numberUS 522995 A, US 522995A, US-A-522995, US522995 A, US522995A
InventorsHiram Stevens Maxim
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hiram stevens maxim
US 522995 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

(Ifo Model.) 2 Sheets-Sheet l.

` H. S. MAXIM. APPARATUS FOB. INDIGATING THB FLOW 0F PLUIDS. `l\To.-5.'2.2,Q`95. Patented July 17, 1894.

TH: nomas vrrzns co., Pneaurrlo.. wAsnmcToN, n, c.

(No Model.) 2 sheets-sheets.



No. 522,995. Patented July'l', 1894.

:i FM4 .ai

/--f aj: MaJ-1y B v B// A A] l C' m A \N u ams Pneus co.. PHoToLl'wo., wAsmNnYou. u. c.




SPECIFICATION forming part of Letters Patent N0. 522,995, dated July 17, 1894. Application led Tuly 18. 1 893. Serial No. 480,828. (No model.) Patented in England July 6, 1892, No. 12,508.

.To @ZZ whom t may concern:

Be it known that I, HIRAM STEVENS MAXIM, a citizen of the United States, residing at Baldwyns Park, Bexley, in the county of Kent, England, have invented a certain new and useful Improvement in Apparatus for Indicating the Flow of Fluids, (for which I have obtained a patent in Great Brit-ain, No. 12,508, dated July 6, 1892,) of which the following is a specification.

The improvement, subject of my present application is designed for use more especially as an indicating feed-water check-valve, and in the following specification it will be illustrated and described in connection with a device of this kind.

My said invention is especially applicable to the feed-water check-valves of steam boilers, and particularly to the boilers of torpedo and similar boats in which the evaporation is usually extremely rapid, and where it is very desirable to determine whether water is entering the boiler or not with more readiness and certainty than the ways and means heretofore resorted to permit of.

It is my object to provide a means by which the engineer or boiler attendant may ascertain at a glance whether water is or is not entering the boiler, and, if it be, at what rate or in what amount.

In carrying out my invention I provide a suitable chamber or casing which is to be interposed between the boiler and the feed- `water supply. Within this casing is arranged a tube containing a piston or disk movable axially within the same. All the water which enters the boiler must pass through the tube or some portion of the same and in so doing raise the piston or disk to a greater or less extent dependent upon its amount or rate of flow. The passage through the tube for the water may be secured by making slots or perforations therein, or in any other way providing for an opening through the same which increases in extent in proportion to the elevation of the piston. The said piston is provided with a stem which extends up into a closed tube or casing which is of non-magnetic metal and the stem a magnetized steel rod or bar, or bars, which cause a small follower on the outside of the tube to rise and fall with the pole or poles of the magnets.

A is the outlet to the boiler, and A the- Suitable inlet from the feed water pipe. valves may be provided for use in addition to the instrument itself, when so desired, but I prefer to construct the device in such manner as to render this unnecessary.

Within the casing or tube A a cylindrical tube B is secured to or over the inlet so that all the water which passes into the casing must enter the said tube, from which the only exit will be aiforded by raising a piston or plunger C and exposing more or less of a number of perforations or slots B' which are made in the tube.

In the construction shown the tube B is screwed into the casing at its lower end,which tits into a recess B provided in the casing to receive it. At the lower end of the tube there is a seat b' for piston or disk C which when resting on the seat prevents the return of water into the supplyor feedpipe,and thereby constituting a check-valve. The said piston or disk its closely but easily within the tube B, in which it is adapted to slide in the direction of the axis thereof. The water delivered into the tube B by the supply-pipe passes out through the perforations or slots B after raising the disk or piston C from its seat through the required distance to uncover a sufficient number of the said perforations or slots.

A rod D is secured to the disk C and extends through a hole in the top or cover of the casing A into a tube D. p This tube is of gun metal or similar non-magnetic metal and the rod D of magnetized steel. I also employ a second rod E which extends up into a tube D", and both rods are set in an iron or steel disk so that they constitute the two limbs or poles of a horseshoe magnet.

To protect the magnet against rust and corrosion, the piston or disk and the two limbs ICO are incased in brass o`r like metal F, and the rods are provided with the usual concentrat-` ing pole pieces G.

Outside the tubes D D" is provided a channel or groove parallel with the line of travel of the poles. In this channel is a small iron or steel roller I-I and a glass cover H is secured in front of said groove. The follower H is attracted by the poles of themagnetic rods through the gun-metal casing and moves up and down with them, so that its position will always indicate the position of the piston and the fiow of water corresponding thereto. At one side of the groove a scale may be marked olf in units which represent the thousands of pounds of pressure per hour for which a given iow of water will be necessary, and

' by means of such scale the flow may be easily regulated.

Itis preferable to use three adjustable pointers or markers L, which may be placed at any .position by the engineer, one being placed at full speed, one at half speed, and one at slow.

The assistant or Stoker who has charge of the feed water can then be ordered to keep the indicating roller directly opposite any one of the vadjustable pointers.

When it is desired to provide a means for locking the valve down on its seat, a screw stem M may be passed through the top of the tube D?, and, when necessary, is turned down to bear upon the Vend of the rod D.

A modification of the device is shown in Figs. 4 and 5, in which a stem N is used and M is arranged to pass through a hole M and to bear upon the valve or piston C directly. This permits the instrument to be considerably shortened, as may often be necessaryy when the space afforded under the deck of a torpedo boat or elsewhere is limited.

It is evident from the nature of the construction and mode of operation of the perforated cylinder and piston that the same result, viz: the increased opening of a passage for the water proportionate to the elevation of the indicating stem maybe secured in various other ways than that specifically described.

What I claim as my invention is- 1. An indicating check-valve comprisingin combination aperforated cylindrical tubehaving a valve seat at its end, a valve movable axially therein, one or more magnetic stems carried by the valve and extending into a tube or chamber' above the valve and a magnetic follower arranged to be movedY along the exterior of the chamber by the attraction of the poles of the magnetic stem and thereby to indicate the position of the same and the corresponding elevation of the valve as set forth.

2. An indicating check-valve comprising in combination a casing, a perforated tube within the same having a valve seat at its end, a Valve movable axially within the tube, one or more magnetized stems carried by the valve and extending into chambers above the valve, a magnetic follower arranged to be moved along the exterior kof the chamber by the attraction of the poles of the magnetic stems, 'a screw stem in a chamber above the valve and entering thek casing and a stem or pro' jection on the valve which may be a magnetized stem or one of the same, in line with the screw stem as set forth.

In testimony whereof I have hereto set my hand this 5th day of July, 1893.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2459689 *22 Sep 194418 Jan 1949Bailey Meter CoFluid rate of flow measuring apparatus
US2635631 *29 Mar 194921 Apr 1953Phillips Petroleum CoPilot valve controlled motor valve
US2674880 *25 Apr 195213 Apr 1954Shell DevVariable area flowmeter
US2752944 *31 Mar 19533 Jul 1956Read Standard CorpDiverting valve
US3481304 *3 Sep 19682 Dec 1969Honeywell LtdIndicators
Cooperative ClassificationG01F1/26