US809786A - Automatic trap or valve for draining heating systems. - Google Patents

Description

PATENTED JAN. 9, 1906.

J. H. DAVIS. AUTOMATIC TRAPOR VALVE FOR DRAINING HEATING SYSTEMS.

APPLICATION FILED JULY 8, 1905 Inventor Witnesses" (a ?/%g/% Att 5.

UNITED STATES PATENT. FIPIECE.

JAMES H. DAVIS, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed July 8,1905. Serial No. 268,77i.

To all Lu/bent it 'HMLZ/ cmtccrn:

Be it known that I, JAMES H. DAVIS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Automatic Traps or Valves for Draining Heating Systems, of which the following is a description.

My invention belongs to that class of devices designed to automatically drain the pipes of a steam or vapor heating system, and has for its object the production of a simple, effective, and reliable device for that purpose.

To this end my invention consists in' the novel construction, arrangement, and combination of parts herein shown and described, and more particularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like or corresponding parts, Figure 1 is a vertical section of my improved trap. Fig. 2 is a transverse section of the same on line 2 2 of Fig. 1. Fig. 3 is a vertical section of a slightly-modified form, and Fig. 4 is a transverse section of the same on line 4 4 of Fig. 3.

In the preferred form shown in the drawings, l is a suitable shell constructed to be connected in and form a part ofa heating system and provided with a removable cap'2, affording ready access to the interior.

3 is the inlet, and l the discharge-opening, to the shell. The inner end of the outlet 4 is formed to receive the snugly-fitting end 5 of a removable thimble 6. The upper end 7 of the thimble provides a seat fora cooperating movable member whose movements control the discharge through the thimble 6, and thus the outlet I.

8 is a vertically-movable float carrying a member 9, constructed and arranged to seat upon the end 7 of the thimble 6 and by the movement of the float control the discharge through the thimble, as above mentioned. The float 8 is preferably in substantially the form shown, in which a quantity of air is confined beneath it, which as the fluid accumulates in the shell is'somewhat compressed, adding to the buoyancy of the float. Suitable guides 10 11 or equivalent means for the purpose are provided to insure the accurate operation of the device. As shown, the valve 9 is carried by a rod or tube 15, centrally depending from the float, while suitable cars 12 13, carried by the float, loosely embrace the guides 10 and 11. I11 the construction shown a tube or duct extends from the outlet 4 to a point above the line of flotation. As shown in Figs. 1 and 2, such duct is shown at 14 extending along the base of the shell and connecting with the lower end of the tube 11, which also acts as one of the guides and extends above the level of any liquid that would be likely to accumulate before the valve would operate to release it. As shown in Figs. 3 and 4, the duct is shown at 16 and extends through the central member 15 to the top of the float. In either case I prefer to use means to aid in keeping the duct free and open. As shown, such means in the form shown in Fig. 1 consists in a small rod 17, carried by the float and extending downward into the duct in the tube 11. As shown in Fig. 3, it consists in a similar rod 18, carried by the cap 2 and extending into the duct 16.

It is obvious that in either case the movement of the float causes a corresponding rela* tive movement of the rod and the duct into which it extends, tending to dislodge any dirt or other matter that might be therein and insuring a free passage of air therethrough.

It will be readily seen that the upper end of the thimble is elevated above the floor of the shell and preferably above the plane of the lower edge of the float, thus providing for the retention of suflicient fluid in the shell to form a seal with the float, and hence prevent exhausting the air confined therein. Such exhaustion would tend to form a partial vacuum within the float, which would decrease the buoyancy thereof, and thus interfere with the efliciency of the device. It is also clear that in cleaning the trap the thimble may be readily removed after the removal of the float, permitting the complete draining of the trap and the ready removal of any accumulated sediment or dirt.

In the construction of my device I prefer to use the well-known form of shellshown, in which a depending wall or apron 19 extends below the plane of the inlet 3, causing a seal when the fluid fills the shell to the level of the lower end of the wall. Thereafter any tendency toward a partial vacuum above the float by reason of the vacuum-pump or equivalent means will also increase the buoyancy of the float, and hence the prompt and eflective operation of the device.

What I claim as new, and desire to secure by Letters Patent, is

1. A device of the kind described, comprising a shell provided with an inlet, and with an outlet in the base, a float provided with a depending marginal edge and a valve inclosed by the marginal edge with its face above the horizontal plane of the lower extreme of the margin, in combination with a removable thimble for the outlet with its top forming a valve-seat elevated above the floor of the shell, and an air-duct extendin from the outlet to the space above the line 0 flotation. 2. A device of the kind described, comprising a shell provided with an outlet positioned in its base, an inlet, and an invertedoup-shaped float provided with a depending stem carrying a valve positioned above the horizontal plane of the lower margin of the float, in combination with a removable thimble in the outlet with its upper end extending above the floor of the shell and terminating in an elevated valve-seat and an air-duct extending from the outlet to the space above the line of flotation.

3. A device of the kind described, comprising a shell provided with an outlet positioned in its base, an inlet, a depending wall before the inlet extending below the horizontal plane of the same, and an inverted-cupshaped float provided with a depending stem carrying a valve above the horizontal plane of the lower margin of the float, in combination with a removable thimble for the outlet arranged with its upper end extending above the floor of the shell in line with the valve and providing an elevated seat for the valve and an air-duct extending from the outlet to the space above the line of flotation.

4. A device of the kind described, comprising a shell provided with an outlet positioned in its base the opening to which is elevated above the floor of the shell, an inlet, a depending wall before the inlet extending below the horizontal plane of the same, in combination with an inverted-cup-shaped float provided with a depending stem with a valve on its lower end in line with the outlet and constructed to control the same and an air duct extending from the outlet to the space above the line of flotation.

5. A device of the kind described, comprising a shell provided with an outlet positioned in its base, an inlet, a depending wall before the inlet extending below the horizontal plane of the same, and an inverted-cupshaped float provided with a depending stem carrying a valve in line with the outlet, in combination with a removable thimble for the outlet arranged with its upper end extended above the floor of the shell providing an elevated seat for the valve, an air-duct extending from the outlet to the space above the line of flotation, and means for freeing the duct of dust.

6. A device of the kind described, comprising a shell provided with an inlet and an outlet, guiding-rods for a vertically-movable float, an air-duct extending from the outlet to and longitudinally through one of the guiding-rods and a removable thimble for the entrance to the outlet, in combination with a float provided with means loosely embracing Y the guiding-rods and provided with a part arranged to normally close the end of the thimble and control the discharge.

7. A device of the kind described, comprising a shell provided with an inlet and an outlet, guiding-rods for a vertically-movable float, an air-duct extending from the outlet to and longitudinally through one of the guide-rods, and a removable thimble for the entrance to the outlet, in combination with a float provided with means loosely embracing the guide-rods, and a depending rod carried by the float provided at its lower end with a part constructed to seat upon the end of the thimble to normally close the same and by the operation of the float to control the discharge.

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

JAMES H. DAVIS.

Witnesses:

BURTON U. HILLS, CHARLES I. COBB.

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