US165190A - Improvement in combined cocks and anti-concussion valves - Google Patents

Description

Combined Cock and Anti- F.` VAN D UZER.

Cun'cussion Valve.

Patented July 6,1875.

fam/1M f UNITED S'rATEs PATENT OEEIGE.

vISAAC F. VAN DUZER.` OF MIDDLETOWN, ASSIGNOR TO CHARLES HARRISON,

OF NEW YORK, N. Y.

IMPROVEMENT IN COMBINED COCKS AND ANTI-CONCUSSION VALVES.

Specication forming partV of Letters Patent No. 165,190, dated July 6, 1875; application n'led June 19, 1875.

To allrwhom t may concern:

Be it known that I, I. F. VAN DUZER, of

Middletown, Orange county, New York, have 'on its seat by a spring powerful enough to re sist the pressure of thewater when at rest, but not powerful enough to resist the pressure which ensues when the water, having been in motion through the pipes, is suddenly arrested by the closing ot' the valve or cock `through which it has been owing.

The accompanying drawings are as follows: Figure 1 is a longitudinal section through the center of the valve shell and stem, showing the induction and eduction passages, and showing the main valve open. Fig. 2 is a similar view, showing' the main valve at the instant of closing, and the supplementary valve slightly elevated from its seat.

Referring' to the drawings, A represents the valve-shell 5 b, the valve-stem, which is pressed upward by the spiral spring bl, and thusppulls the valve b2 up against the annular valve-seat a.

The valve is a iiat disk provided with a hol low bolt, c, upon which a male screw-thread is cut, which engages the female thread c on the inside of a hole bored in the lower end of the valve-stem. A shoulder, d, is formed on the inside o f the hollow bolt c, which engages one end otthe spiral spring c, which is wound around the supplementary valve-stem f, and expands against the collar fon the lower end ot' the supplementary valve-stem. The upper end of the supplementary valve-stem is provided with a conical collar, g, the under surface of which engages the countersunk seat g', formed in the upper end of the hollow bolt c.

The spiralsprin g e is made stiff enough to hold the conical collar g downupon its seat against the ordinary pressure ofthe water at rest; but when the valve is in the act of closing, and thereby suddenly' checking the momentum of the water, the spiral spring e yields, and a jet ot' water passes through the hollow bolt c into the cavity in the lower end of the valve-stem, and out therefrom through the lateral outlet h. The structure to which I have applied my supplementary valve is what is known as a slow-closing7 or otherwise a variable, chamber-valve, the closing of the main valve being regulated by the escape ot' water from the chamber i in the upper part of the valve. When the main valve is fully open, so as to withdraw the plug j from the variable cham.- ber c', the variable chamber becomes filled with water, and in such case the valve closes slowly; but ifthe valvestem is onlypartially depressed, so that, although the main valve is open, there is no water admitted to the variable chamber, the main valve will close suddenly if pressure is removed from the valve-stem, and in that case my supplementary valve operates to ease the closing of the main valve and prevent concussion by injecting a small jet of water into r the chamber above the valve. By the gradual closing of the supplementary valve in obedience to the operation of the spiral spring e the momentum of the current of water is gradually, instead of suddenly, checked.

I claim as my invention- .Y

In a cock for fluids, the combination of the main valve with a supplementary valve and a spring so graduated in strength as to hold the supplementary valve upon its seat against the ordinary pressure of water in a state ot rest, while yielding to allow the supplementary valve to open when the main valve is suddenly closed.

I.V F. VAN DUZER.

Witnesses:

DANL. GoNvrN, U. T. HAYES.

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