US1132886A

US1132886A - Valve.

Info

Publication number: US1132886A
Application number: US63493611A
Authority: US
Inventors: Thomas Mcavity Stewart
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-06-23
Filing date: 1911-06-23
Publication date: 1915-03-23
Anticipated expiration: 1932-03-23

Description

T. M A. STEWART.

VALVE.

APPLICATION FILED JUNE 23, 1911.

1 1 32,88 Patented! Mar. 23, 1915.

THOMAS I/LCAVITY STEWART, OF MONTREAL, QUEBEC, CANADA.

VALVE.

Application filed J 11118 23, 1911.

. through the action of an overbalancing memher, valves constructed according to this invention being especially adapted for use in connection with steam whistles or the like The invention has for its object to prov de a valve which will be positive in its action and generally to improve the construction ofvalves' of this type.

The invention may be said to consist of the construction, arrangement and combination of parts as hereinafter described and set forth in the claim. 7

For full comprehension however of my invention reference will be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate the same parts and wherein:

Figure 1 is a sectional view of a valve constructed according to my invention. Fig. 2 is a detail sectional view of the valve proper taken at right angles to Fig. 1 on the line 22 Fig. 1.

The valve casing is shown at 1 and is provided at one side with an intake port 2 adapted to be connected to a source of pressure fluid supply and at its opposite side with an outlet opening 3 here shown as communicating with a steam whistle a portion of which is indicated at Extending between opposite walls of the valve casing and separating the intake and outlet parts from one another is a partition 5 having a tapped opening 6 in which is screwed a. short sleeve 7 constituting the valve seat upon which the main valve 8 seats. The valve 8 is provided with a forwardly extending hollow stem which may comprise an interior hollow member 9 integral with the valve and a sleeve 9 placed over the said member 9 and having a piston 10 formed integrally upon the forward end thereof, this sleeve 9 being of smaller diameter than the interior of the seat sleeve 7 to Specification of Letters Patent.

Patented Ma es, .1915.

Serial No.-634,936.

permit of passage of fluid when the valve 8 is lifted and having a series of outwardly projecting ribs 9 whereby it is guided in the said seat sleeve. The piston 10 extends into a short cylinder 11 the annular wall whereof forms an integral part of the valve casing while its forward end is closed by a cap or plug 12. The combined length of the-sleeve 9 and piston 10 is less than the distancebetween the underside of the valvew8wa-nd the inner end of the piston cylinder 11 formed by the plug 12. This piston 10 is of larger area than that of the valve 8 so that when fluidunder pressure is admitted to the space betweenthe piston and cap 12 the pressure on the piston will overbalance the pressure on the valve and cause the latter to open. The extent to which the valve opens maybe regulated by means of a screw 1'3 threaded into a plug 13 screwed into a tapped open like is mounted in an annular groove in the outside of the piston.

space in front of piston 10 is controlled by a pilot valve 15 located within the hollow stem 9 and seating in a seat 16 formed by a contraction of the passage therethrough, the valve having a forwardly projecting stem 17 which extends through the piston 10, cap 12- and a sleeve 18 threaded into a tapped opening 19 in the latter, to a point outside the valve casing and in close proximity to the lever 20 pivoted as at 21 to the valve casing and provided with any suitable connection whereby it may be manually operated. The rear end of the valve 15 extends to a point a short distance from a plug 13 screwed into a tapped opening in the front end of the main valve and having a longitudinal passage 2:2 for the admission of fluid to the space, the fluid passing thence through an A spring 30, surrounding the stem 17 and bearing at opposite ends between the cap 12 and a pin 31 extending transversely through the stem, returns the valve 15 to its seat when the lever 20 is released.

Operation: To open the valve, lever 20 is depressed and the valve 15 is lifted through the medium of stem 17, from its seat. The pressure fluid then passes through

passages

22, 23, 24, 25, 26, to the cylinder 11. The

pressure upon piston 10 overbalances the pressure on valve 8 and the latter opens. When lever 20 is released the spring closes the valve 15 when the slight leakage between the stem 17 and parts 11 (no packing being provided between these parts) and 18 allows the fluid to exhaust from the cylinder 11 and the valve 8 closes.

I claim In a valve, the combination with a casing having an inlet and an outlet communicating with each other, a partition located between the inlet and outlet and having an opening therein, a main valve seat within said opening and a piston cylinder formed in the casing, of a main valve adapted to be seated upon the main valve seat and having a tapped opening therein, a bored plug screwed into the opening in the main valve, an adjustable stop for limiting the opening movement of the main valve, such valve comprising a. hollow stem communicating with the opening in the valve and leading to the piston cylinder, an auxiliary valve seat formed in said hollow stem, a sleeve slidably mounted upon the stem, engaging at one end with the underside of the main valve and having a piston head at its opposite end and located in and spaced from the inner end of said piston cylinder, such sleeve being of smaller diameter than the interior of the main valve seat and having outwardly projecting ribs thereon, a closely fitting auxiliary valve located in said hollow stem between the auxiliary valve seat and the bored plug, such auxiliary valve being reduced in diameter at a point above its seat and having a longitudinal passage therethrough and ports leading from such passage to the exterior of the reduced portion of the valve, a loose fitting valve stem extending from the auxiliary valve to the exterior of the casing, a spring yieldingly holding the auxiliary valve upon its seat and means for opening the auxiliary valve against the influence of the spring.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

THOMAS IHOAVITY STEWART.

W'itnesses FRED J. S'IEARNS, ALBERT H. .BATCHELOR.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of IEatents,

Washington, D. 6.