US284452A - William c - Google Patents

Description

(No Model.) I V W. O. MAOKINNEY.

- 'VAGUUM VALVE. v No; 284,452. I Patented Sept. 4, 1883 .FZG. 3.

N. PEIERs. Hwwumo m mr. Walhingicn. 12.0

- UNITED STATES.

PATENT OFFICE.

, WILLIAM C. MAOKINNEY, on PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO JAMES BUTTERWORTH, CHARLES C. BUTTERWORTH, AND WILLIAM B. BUTTERWORTH, ALL OF SAME PLACE. r

vAcuuMj-vALvE.

SPECIFICATION forming part of Letters Patent No. 284,452, dated. September 4, 1883.

' Application filed April 2, 1883. (No model.)

ments, fully described hereinafter, in vacuumvalves for drying-cylinders; and the object of .10 my improvements is to so construct the easing of the valve and to so combine it with the latter that the direct and instantaneous admission of air into the drying-cylinder will be assured whenever a partial vacuum occurs I therein, all danger of the collapsing of the cylinder being thus obviated. I In the accompanying drawings, Figure l is a sectional view of my improved vacuumvalve; Fig. 2, a view of one end of the valve- 2o casing; Fig. 3, a section on the line 1 2, Fig.

1; and Fig. 4., views of the several parts detached from each other. l

My invention is intended, mainly, for hollow steam-heated cylinders for drying fabrics,.pa-

per, &c., A in Fig. 1 representing part of one of the ends or heads of such cylinder.

The casing of the valve consists of the eX- ternally-threaded and flanged ring B and the smaller ring, a, which is connected to the main 0 ring by legs bfour in the present instance as shown in Fig. 3, so that there are openings w between the legs. A seat, cl, is formed on the inner end of the main ring B of the casing, for

thevalve D, which has'two stems, e and e,

the former being adapted to a guide, f, connected to the ring B by webs h, and the spindle 6 being adapted to a guide, 9, connected by webs to and forming a part of an externally-threaded ring, E, which is screwed into 40 the ring a of the casing, the latter ring being of such a diameter internallyas to permit the withdrawal of the valve from and its intro duction into the casing when been detached therefrom.

WVhen a machine of which a drying-cylinder forms a part is in operation, steam at a o mparativelylow pressure is maintained within the cylinder; but occasionally the latter bethe ring E has I comes cooled--by wet fabrics, for instance and this causes a condensation of steam, and consequently a partial vacuum, and if this is not at once neutralized by the admission of air the collapsing of the cylinder will take place. Avacuumvalve for this purpose should be instantaneous in its action and simultaneous with the formation of the partial vacuum;

not be avoided. A vacuum-valve with tortuous passages might retard the admission of air for an instant, but long enough to permit the collapsing of the cylindera result which my improved valve has been designed to obviate.

screwed into or otherwise secured to the head A of the drying-cylinder, the valve remaining closed by the pressure of steam in the said cylinder; but should a partial vacuum be crecauses, therewill be an instant opening of the valve by the pressure of the atmosphere on into the cylinder to neutralize the partial vacuumbefore any collapsing of the cylinder can take place. In the first place it will be noted that the valve isso guided that it will be opat a comparatively low pressure to maintain it in contact with its seat, or of the external partial vacuum occurs within the cylinder, and the moment the valve leaves its seat under these circumstances there will be an instantaneous and direct introduction of a large and diffused volume of air into the cylinder to neutralize the partial vacuum, for it will be seen that the ring B of the valve-casing terminates at the inner face of the cylinder-head, and that the seat of the valve is at the inner end .of this ring and close to the openings w between the legs 12 of the casing; hence the move ment of the valve induced by a partial vacuum in the cylinder will permit the air to pass directly into the same through the said open ings w in the direction pointed out by the inclined arrows, aswell as through the openings otherwise the collapsing of the cylinder may 'The threaded ring 13 of the valve-casing isv ated therein, owing to the above-mentioned,

air to move the valve from the seat when a its exterior surface, and an instant rush of air erated by the slightest effort either of steam air from the cylinder before the valve is actu ally closed.

I claim as my invention' 1. The combination of the valve D and its I two stems e 6 with a casing open at its outer end, and affording a seat for the valve and guides for its two stems, and having openings w close to the said seat, all substantially as set forth.

2. The combination of the casing, consist ing of the cylinder B, open at its outer end, its guide f, legs 1), ring a, and detachable ring E, having a guide, g, with the valve and its two stems, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two sub- 20 scribing witnesses.

WILLIAM C; MAGKINNEY.

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