US623194A - Carl wilhelm vollmann - Google Patents

Description

Z avwemto'a Patented Apr. l8, I899.

B. W. VOLLMANN.

VALVE.

(Application filed Apr. 11, 1898.)

s PETERS co. Pwam-umowwwmc-mu. u. c.

No. 623,l94.

(No Model.)

with STATES PATENT Orrrcn.

CARL XVILHELM VOLLMANN, OF MONTREAL, CANADA.

VALVE.

SPECIFICATION forming part of Letters Patent No. 623,194., dated April 18, 1899.

Application filed April 11, 1898.

To whom it may concern:

Be it known that I, CARL WILHELM VoLL- MANN, of the city of Montreal, Province .of Quebec, Canada, have invented certain new and useful Improvements in Valves; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention, although applicable for the control of fluids or gases generally, is particularly applicable for the control of impure gases or liquids, and has for its object to en.- able the more perfect closing of a port to be attained and at the same time to remove any foreign substance that may adhere to the valve-seat. v

The invention consists, broadly speaking, in adapting a valve to slide across its seat and be held yieldingly in contact with either a portion or the whole thereof until it is in closing position, at which time it is forced by unyielding means into perfectly tight contact therewith.

More specifically speaking, the valve consists of two sections connected at one end to a traveling block and adapted to travel with the block in a chamber intersecting the passage for the gas or fluid, as the case may be. Yielding resistances, preferably in the form of a pair of coiled springs, bear between said sections and cause them to normally yieldinglybear upon the valve-seats formed by the ends protruding into said chamber of the pipe forming the said passage. Projecting upwardly from the lower end of the chamber to a point near the top of the passage is awedgelike device, with the inclined sides of which the sections of the valve, which are also wedgelike in form, come in contact as they are in the act of completing the closure of the passage, and as they are forced farther toward the bottom of the chambers will be jammed against said valve-seats, the lower edges of the valve-sections being formed with knifeedges to scrape the faces of said valve-seats and remove any foreign substance that may adhere thereto.

The means for actuating the valve consists, preferably, of a screwheld against longitudinal movement, but free to rotate at its lower end in a recess in the upper end of the wedgelike projection and at its upper end in a cap Serial No. 677,226. (No model) forming the upper end of the chamber, the before mentioned traveling block having a screw-threaded perforation therethro ugh and taking over and traveling along said screw as the screw is rotated, which can be done by any preferred means.

For full comprehension, however, of thein vention reference must behad to the accom panying drawings, forming a part of this specification, in which like symbols indicate corresponding parts, and wherein- Figure l is a longitudinal vertical sectional view of a valve constructed according to my invention; Fig. 2, a transverse vertical sectional view thereof; Fig. 3, a part plan and part sectional view taken on line 3 3, Fig. 1; andFig. 4 a horizontal sectional view taken on line 4 4, Fig. 2.

The valve-casing is preferably formed with a horizontal passage 5, having midway of its length an enlargement 6, with open top provided with a lateral flange 7, grooved as at 8.

A dome 9, havingits lower open end flanged,

The enlargement 6 and dome 9 constitute the valve-chamber, into which the ends of the pipe-like portion of the casing project and form valve-seats 16 17. The bottom or floor of this chamber has a recess 18, in which is located the lower diminished end 19 of a wedge-like projection 20, having its upper end recessed,as at 21, to receive the lower diminished end of the before-mentioned screw 15, which is formed with a rigid flange or collar 22 to bear upon the interior of the top of the dome and retain the screw 15 against longitudinal movement. The wedge 20 is retainedin place simply by its diminished end 9 resting in the recess 18 and the connection of its upper end with the lower end of the the respective valve-seats 16 and 17. These .valve-sections have their lower portions formed with tapered recesses to take over the wedge-like projection 20,while their lower edges are formed with knife-edges 2G and their upper adjacent parallel faces recessed, as at 27, to take over a traveling block 28, having a screw-threaded perforation 29. to take upon and travel along the screw 15, these valve sections being maintained in yielding contact with the valve-seats by means of coiled springs 30, having their ends located in recesses formed in the adjacent faces of the lower parallel portions thereof.

By the rotation of the screw which may be effected by any preferred means, the valvesections will through the block 28 be either raised orlowered in the chamber. While they are in their raised position and gas or fluid is flowing through the port, a quantity of grit or other foreign substance frequently gathers upon the valve-seats. Such is particularly the case when impure gases or liquids are controlled. Thisis scraped 06 by the knife-edges 26 during the lowering of the valve-sections, the springs 30 facilitating such action, while the wedge 20 acts upon the sections as they are completing the closure of the ports and forces them into perfectly-tight contact with their valve-seats.

\Vhat I claim is as follows:

1. In combination with a sliding valve and valve-seat the valve having its lower edge formed with a knife-edge, of stationary means for maintaining said valve always in yielding contact with its seat and unyielding means independent of said valve and adapted to act upon same at the completion of its closing movement and force same into contact with its seat and means for operating said valve, for the purpose set forth.

2. The combination of a valve-casing having achamber extending at right angles to and intersecting the passage therethrough, a valve formed in two sections located respectively adjacent to the ends formed by the in:

tersection of said passage, a wedge-like pro-,

jection carried by the floor or bottom of said chamber and located intermediate of said valve-sections, the lower edges of said valvesections being formed-with knife-edges, and a yielding resistance adapted to maintain said valve-sections yieldingly in contact with their valve-seats, substantially as and for the purpose set forth.

3. The combination with a valve-casing of a sliding valve having a knife-edge and a spring tending to force said edge against the valve-seats in traveling over same to keep 'such seats clear of foreign substances, as set CARL \VILHELM VOLLMANN.

NVitnesses:

WILLIAM P. McFEAr, FRED. J. SEARS.

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