US1592570A - Assigitos to the b - Google Patents

Description

F. J. SHOCK July 13 19 26.

TANK VALVE v Filed July 19 1922 [nvenlor Eloraz'n JShvo/a Hay.

Patented July 13, 1925.

FLORAIN J. SHOCK, 0F AKRON, ()HIO, ASSIGNOR TO THE EMF. G-OODRICHOOll-IPANY, OF NEW YORK, N. Y., A CORPORATIUN OF NEW YORK.

TANK VALVE.

Application filed July 19, 1922.

a rubber valve of improved form which may,

if desired, be made by a simple method such as molding on a solid core and which shall possess the necessary air capacity and the necessary stiffness in its upper portion without resorting to extra reinforcing expedients, while its lower seating portion etc I' hibits ample sealing properties through a long period of service.

Of the accompanying,crawings, Fig. l is a side elevation of a preferred form of my improved valve.

Fig. 2 is a cross-section on the line 22 of Fig. 1, showing also the tank outlet in broken lines.

Fig. 3 is a reverse plan view.

The valve asshown is in one piece of, preferably, homogeneous vulcanized rubber,

either of so-called floating stock or a stock which, by the incorporation of only small quantities of mineral matter, has a specific gravity approximating that of water.

Its lower or seating portion or head 10 is of conoidal or semi-spherical shape for seating within the funnel-shaped valve-seat 11 surrounding the tank outlet, while its upper portion or stem 12 is cylindroidal in form, being smaller in diameter at its lower end than the upper diameter of the seating portion and having a flattened top 13 in which is embedded themetal spud or anchorage 14; for screwingion the threaded lower end of the stem or red 15.

The wall of the seating portion to is of downwardly-tapering cross-section, being thickest at its upper end where it merges into the wall of the upper portion 12 and shelves out beyond the latter. The interior air-chamber 16 is preferably formed by molding the valve around a metal core or mandrel, in which case the contracted mouth or opening 17 at the lower end of the valve is formed by the neck of said core and is of such diameter as to permit the withdrawal of the body of the core by stretching'the mouth over it.

The described construction gives a vertically-elongat-ed air-chamber of such capacity as to afford the necessary buoyancy to keep the valve oil its seat, when lifted by the stem 15, during discharge of the contents of the tank. The upper portion 12, tl'iough of soft rubber and having no ribs or other usual Serial No. 576,028.

stiffening expedients, is prevented from collapsing under the head of water when the valve is seated, both because of its form and relatively small diameter and because of the sti'dening effect aliiorded by the wallthickness of the upper end of the seating portion 10, such thickness, however, being insufficient to interfere with a good sealing contact by conformity of said seating portion or valve proper with its seat. This sealing is promoted by a more direct transmission of the water pressure through the upper portion 12 to the zone of seating con tact of the valve produced by a slight flattening of the portion 10 under the hydrostatic pressure, the base diameter of such upper portion being less, or at least no greater than the average diameter D of said zone. It is found that one of the greatest advantages of this valve is that, although preferably of soft, flexible construction substantially throughout, it will not materially pull out of shape during long-continued use, a common faultwith many of the older types of tank-balls, even when the top is made of semi-rigid or reinforced construction. This permanentdeformation' is avoided by the mushroom shape of my device, which I believe to be broadly new in a valve of sub stantially all-rubber, flexible construction. Said shape is conferred by the provision of a bulbous head as shown, in combination with a stem of smaller base diameter than the greatest diameter of the head, without reference to the particular shape of said stem. Another factor contributing to this improved result is the provision of an annular portion on the head 10, of uniform, maximum thickness at the junction of said head with the stem 12, in a full-molded valve made of stock which is at once soft and permanently resilient by reason of its high proportion of pure rubber.

It will be understood that the shape and other details may be somewhat varied without departing from my invention, and I do not exclude the use of ribbing or' other usual reinforcement but merely say that my improved form of valve makes it non-essential.

in the valve here shown, an annular, upwardly-projecting flange or skirt 18 is molded around the upper margin of the seating portion 10 above the seating Zone to shield the shelving edge of the valve from expo sure to the outgoing stream of water adja 1. A buoyant tank valve o2": unitary,

flexible, soft-rubber construction compris-v ing a hollow lower or seating portion, and an upwardly-prejecting, closed, cylindroidal stem of smaller diameter than'said lower portion, forming substantially the upper half of the valve. 7

' 2. A flexible, buoyant valve" of full-molded construction composed of substantially float i-ng soft-rubber stoclrand having a hollow stem and a wide-mouthed, eonoid'al head integrally connected with and extending circumterentially beyond the lower end of said stem." p A 3. A buoyant tank-valve of mushroom shape having a flexible, soft-rubber, conoizdal head and a hollow, oyl ifndroida'l stein vulcanizedto said head at the back, of the latters seating zone.

4. A buoyant tank-valve of mushroom shape having a flexible, soft-rubber head,

and a hollow stem having integral con" nection with said head'at the back of the latters seating zone and flexibly-torqued o't soft rubber at and adjacent to said connection.. i

5'. A'buoyant tanlovalve of flexible, fullmolded construction, composed 'ofsoft rubber stock and com-prlsing a wide-mouthed,

. conoidal head and a hol'low stein, said-head including an annular portion of substantially uniform. maximum thickness at its junction with the stem.

6. A buoyant tank-valve of mushroom shape comprisinga flexible, soft-rubber conoidal headhaving its region of greatest thickness at an intermediate seating zone,

and a hollow rubber stem vulcanized to the head at said region of greatest thickness. 7

7. A flexible, hollow, unitary tank-valve of mushroom shape. composed substantially throughout of soft vulcanized rubber, the head of said valve having its region of greatest thickness at its junction with the hollow stem oi the valve at the seating zone of said head 7 V I 8. A buoyant mushroom tank-valve comprising a hollow',cyl1ndroidal stem, and a co noidal head of flexible, soft-rubber construc tion formed with anupwardly-projecting, outeri marginal flange.

9. A buoyant mushroom tankevalve of flexible, unitary, soft-rubber construct-ion comprising a hollow, cylindroidal stem, and

a conoiclalhead having its region of greatest thickness where it joins saids'tem at "the.

seating zone of the'h'ea-d, and formed: with thinner, upwardly-projective, outerniarginal flange."

10. A buoyantinu-shrooni valve having a wide-mouthed, flexible rubber head-and hollow, cylincli'oidal rubber stem integrally vulcanized-thereoin V L 11. A buoyant mushroom tank-valve co1nprising a stem, andfa conoidal: head of flexible, soft rubber construction formed with an upwardly projecting, outer marginal flange. 7

12. A buoyant mush-room tank valve coin prising a hollow stem, and a hol-l-ow,'conoidal head of flexible, soiit rubber construction marginal flange. a

13. A buoyant valve of integral, flexible, soft rubber construction compr sing a hol- .low stem and a hollow sea-ting portion en-" closing a chamber provided with a'wide' opening at the bottom, and an upwardly projecting, annular, marginalupper lip on the seating portion.

In witness where'otl have hereunto set my hand this 13 d'ay of Jung-.1922

FLoRArN a. snooir formed with an upwardly projecting, outer

Images