US578046A - Safety-valve - Google Patents

Description

(No Model.)

C. M. SIEIELDRAKI;v Y

SAFETY VALVE. v

No. 578,046. Patented Mar. 2, 1897.

A UNITED STATES PATENT OFFICE.

CHARLES M. SHELDRAKE, OF PHILADELPHTA, PENNSYLVANIA.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 578,046, dated March 2, 1897.

Application filed October 24, 1895.

To all whom it may concern,.-

- Be it known that I, CHARLES lvLSHELDRAKE, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Safety-Valves, which improvement is fully set forth in the following speciv fication and accompanying drawings.

My invention consists of a'novel construction of safety-valve in which the stuffing-box is dispensed with and provision is made for causing a quick movement of the valve by means of a Weight which is movable upon a suitable guideway or track above said valve after the same has been opened to a slight extent, said valve being employed as a safetyvalve wherever such are used.

It further consists of novel details of construction, all as will be hereinafter set forth.

Figure l represents aside elevation, partly in section, of an automatic lever-valve embodying my invention,` the valve being shown in closed position. Fig. 2 represents a side elevation, partly in section, of the same valve shown in open position. Fig. 3 represents a modiiied form of weight employed in which the friction is reduced to a minimum. Fig. 4 represents a section on line wat, Fig. 5. Fig. 5 represents an end view of Fig. 4.

Similar letters of reference indicate corresponding parts in the several figures. A

Referring to the drawings, A designates a valve-casing, the same being provided with a base portion B, to which is attached the upright post or standard C.

D designates a valve-seat within said casing, and E a passage extending to the exterior of the said casing above said seat.

G designates a cap mounted on said casing A, through which the valve-stem H passes, the lower extremity of the latter within said casing being provided with the pistons or valves J and .K and the said casing having an inlet F in its base.v 4

L designates a packing-ring or washer attached to the under side of said piston-K, the upper side of the piston J having a similar packing-ring or Washer M attached thereto, said packing-ring or washer M being adapted to contact with the under portion of the cap G when the valve is open.

N designates a lever which is fulcrumed at Serial No'. 566,746. (No model.)

P to the upper portion of the standard C, said lever having a slot R therein through which passes the pin or stud Q, the latter being secured to the upper portion of said stem H. n

S and T designate upright members extending from said rod N to the upper extremities of said members, being joined by the rod or bar Il, upon which latter the weight V is adapted to slide' or ride over the center of said stem, said weight being round, square, or other desired shape, as is evident.

'W designates a slot in the upper portion of the upright S, through which passes a screw X, by means of which the contacting portions of the rods or bars'S and U are adjusted in the desired position.

Y and Z designate eyes which are attached to the bars or rods S and U'and T and N at their junctions, respectively.

The fulcrum P and the pivotal stud Q are so located and the height of the valve-stem H is such that when the valve K is on the seat D the lever N is in substantially horizontal position, as seen in Fig. l, and that the upright member T is longer than the member S and nearer to the standard C andvalvestem H than said latter-mentioned member.

The operation is as follows: .When the pressure entering the inlet F increases above the norm al,the valve-pistons J and K are elevated from the position seen in Fig. l into the position seen in Fig. 2, and the surplus or extraordinary pressure will escape through the outlet E, it being noted that when the piston .J is in its highest position the packing M contacts with the under side of the cap G, forming a tight joint therewith, so that no leakage can take place at this point, thereby rendering the employment of a stuffing-boX-unnecessary. When the valve starts to move to its upper position from the position seen in Fig. l, the instant that the rod U passes from the horizontal position, so as to incline downwardly fromleft to right, the ball V will start to roll toward the right into the position seen in Fig. 2, whereby it will be evident that a greatly-accelerated movement will be given to the valve by reason of the mounting of the weight V in the manner described, a simil'ar downward accelerated movement taking place the instant that the rod or bar U begins to incline downwardly from the right to the IOO left, or, in other Words, from the position seen in Fig. 2 to the position seen in Fig. l.

It will be apparent that when the upward pressure on the valve is reduced so that its Weight will overcome that of the Weight V, and so fall, and the bar U is tilted so that it inclines in the opposite direction from that shown in Fig. 2 the Weight V Will rapidly resume the position seen in Fig. l, thereby seating the valve. In Fig. 3 I have shown a Weight A', provided with a pulley or roller B', which is journaled in a recess in said weight, said roller being movable on the rod U in substantially the same manner as the Weight V moves.

In Figs. et and I have'shown avveight C', which is cut out, as indicated in Fig. 5, and is connected by means of the studs or rods D', upon which the rollers or pulleys E are mounted, the relative position of said Weight with respect to the rod U being apparent from said figures, it being evident that said Weight travels only one-half as far as the Weight A' or V during the movement of the valve.`

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In an automatic lever-valve, a casing having a valve-seat, an outlet-passage therein above said seat, a valve adapted to contact with said seat and having a valve-stem attached thereto, the inlet to said casing being through said seat and said valve being adapted to be raised by the pressure of the incoming fluid, a standard adjacent said casing, a bar fulerumed on said standard, means for causing said bar and valve-stem to move in unison, uprights of unequal length attached to said bar, a rod connecting said uprights, and a sliding Weight movable upon said rod, substantially las described.

2. In an automatic lever-valve, a casing havingaseat therein, an outlet-passage above said seat, a valve adapted to contact with said seat having avalve-stem attached thereto, the inlet of said easing being through said seat, and said valve being adapted to be raised by the pressure of the incoming fluid, said valve having a plurality of pistons, the upper piston being provided with packing on its upper side, and its lower piston having packing on its lower side, a packingless cap for said casing, a standard adjacent said casing, a bar fulcrumed on said standard, a pin common to said bar and valve-stem, uprights of unequal length attached to said valve-stem, a rod connecting said uprights, and a Weight movable upon said rod, substantially as described.

3. In an automatic lever-valve, a casing with an inlet in its base, and an outlet in its side, a valve-seat in which said inlet-passage is located, a post located adjacent said casing,

a valve in the latter, a cap on said casing, a

stem for said valve movable in said cap, a bar fulcrumed on said post, and having a slot therein, a pin common to said bar and stem, uprights of unequal length mounted on said bar, the longer upright being nearer to said post, a rod joining said uprights, and a Weight movable on said rod, substantially as described.

4. In an automatic lever-valve, a casing A, post C, the pistons J and K, having the packings L and M on their upper and lower sides respectively, the valve-stem II, the bar N, fulcrumed in said post C, and having a slot therein,'a pin Q com mon to said slot and stem, the members S and T, an adjustable bar U and a Weight V movable thereon substant all y as described.

5. In an automatic lever-valve, a casing having a valve-seat, an outlet-passage therein above said seat, a valve adapted to contact with said seat and having a valve-stem attached thereto, the inlet to said casing being through said seat, and said valve being adapted to be raised by the pressure of the incoming iuid, a standard adjacent said casing, a bar fulcrumed lon said standard, a pin comlnon to said bar and valve-stem, uprights of unequal length attached tosaid bar, a rod connecting said uprights, and a recessed Weight having a roller journaled therein, said roller being adapted to contact with said rod, substantially as described.

CHARLES M. SHELDRAKE.

Witnesses:

JOHN A. WIEnERsHnn/r, E. H. FAIRBANKS.

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