US1285493A - Back-pressure valve. - Google Patents

Description

C. F. WALLACE & M. F. TIE RNAN.

BACK PRESSURE VALVE. APPLICATION FILED NOV. II, l9l6.

1 ,285,93 I. Patented Nov. 19, 1918.

STATES PATENT @F TCE.

CHARLES E. WALLACE, or NEW YORK, AND MARTIN r. TIERNAN, on NEW ROCHELLE.

' NEW YORK.

Specification 02 Letters Patent.

Original application filed March 26, 1815, Serial No. 17,122. Divided and this application filed November 11, 1916. Serial No. 130,755.

To all whom it may concern.

Be it known that we, Ci'mnLEs F. WAL- LACE and MARTIN F. TIERNAN, citizens of the United States, residing at Tompkinsville, borough of Richmond, city and State of New York, and New Rochelle, county of Westchester and State of New York, respectively, have invented certain new and useful Improvements in Back- Pressure Valves, of which the following is a clear, full, and exact description.

This invention relates to constant back pressure valves, such as disclosed in our application for patent filed March 26th, 1915, Serial Number 17,122, of which this application is a division.- Said application.

discloses apparatuses and processes for the treatment or the purifying of water, etc., and one of the ob ects of the present invention is to provide an automatic valve somewhat in the nature of a check valve, and which is constructed more particularly with reference to the control of chlorin gas under pressure as'it passes through a line of piping to the point of application to the water to be treated or purified.

Another object of the invention is to provide such a device with a diaphragm operated needle valve, which is free from any form of packing or stufling box. Another object of the invention is to provide a valve which prevents water from backing up into.

the chlorin side of the apparatus in which said valve may be used. Other objects are to provide a simple, practical and eiiicient back pressure and control valve automatically operated by gas or fluid pressure in the manner and for the purpose to be hereinafter more fully set forth.

These being among the objects of the present invention, the same'consists of certain features of construction and combinations of parts to be hereinafter described and then claimed with reference to the accompanying drawings illustrating a desirable embodiment of the invention, and in which- Figure 1 is a side elevation; and

Fig. 2 is a vertical central section through the valve.

The objects of this invention are directed to the production of a valve which has a constant back pressure so as to result in a constant density of the gas. Second, to

provide a means by which the gas will be filtered before it passes through the seat or orifice. Third, to so construct the valve that when the gas through it ceases to flow it w1l1 close tight and prevent water from flowing'back through it, and, fourth, to so construct the device that. any water that may flow back through the valve seat will be trapped in a non-corrosive cup, so that when the gas flows again the trapped water will be carried ofi.

The apparatus which may be used in connection with the improved valve is not shown, as, for the purpose of illustrating the valve, only the inlet and the outlet pipes are necessary. The gas line, as for chlorin gas for which the present valve is particularly adapted, delivers gas to the casing of the back pressure valve device.

This device preferably comprises two casing sections 136, 137, which are rigidly fas- -being seated upon the central portion of the diaphragm while the upper end of the spring is positioned in a seat plate 144., upon which bears a set screw 145 which is screwed into the central portion of the casting 137. Clamped between the two sections or castings 136, 137, is a silver. cup 146 which is located at the underside of the diaphragm 138. This cup divides the space below the diaphragm into a lower chamber 147 communicating directly withthe gas inlet pipe 135 and an upper chamber 148 within the cup, and extending to the valve seat 140 which is located at the apex of the cup. There are a plurality of holes or perforations 149 located in the rim of the cup 146, and through these the gas passes in small jets from the lower chamber 147 into the upper chamber 148. Preferably between the pipe 135 and the cup 146 there is located in the chamber 147 a screen 150 of suitable filtering material. The outer edge of the Patented Novlt 1918.

,146 may trap and hold a limitedamount of with the proper operation of the valve.

sure is produced.

said screen is in contact with the casin section 136 while its apex closely sufrroun s the upwardly projected. central part of section 136.. it will be seen that the cup 146 serves to trap a slight leak of water from the silver tube 142 should such occur whenthe chlorin is introduced into water under pressure and that the filter 150' serves to str 'n out any foreign particles the gas w ich might lodge in the valve seat 140 an interfejr'e n operation, the spring 143 is adjusted by the set screw 145 so as to hold the needle valve against the valve seat at a predetermined tension. Gas passing into the lower chamber 147 and thence into the upper chamber 148, through the perforations 149, will act to raise the valve 139 when a suilicient pres- Said back pressure valve will act somewhat in the nature of a check valve. It will be seen that although the cup water which may back up through the pipe 142, it will do no harm as it will be. dis

charged when the gas is turned on from some point in the line for controlling the supply.

It is obvious that the invention is sus- 'cepti'ble of modification, asparts may be omitted, parts added, and parts substituted without departing from the spirit and scope thereof, as expressed in the claims.

What we claim as new is 1. Ar'back pressure valve, comprising in combination two chambers separated by a flexible diaphragm, one of them containing a valve proper operable by said diaphragm to control said trap opening.

2. A back pressure valve, comprising in combination two chambers separated by a flexible diaphragm, one of them containing a pressure medium and the other having two openings, a cup-like partition dividing the latter chamber into two sub-chambers,

said partition being supported from its upper edge and its lower end, and being provided with an upper series of perforations and the lower portion thereof constituting a trap, one of said openings being located instances at the lower end of said trap and sufficiently below said perforations to provide said trap, and a valve proper operable by said diaphragm to control said trap openhaving an upper series of perforations and the lower portion of said partition constituting a trap, a valve-seat in the lower end of said trap, and a valve proper operable by said diaphragm, the casing section around said partition having an inlet opening, and said valve proper controlling the opening of said valve-seat.

4. A back pressure valve, comprising in combination two chambers separated by a flexible diaphragm, one of them containing a pressure medium and the other having two openings, respectively for the inlet and outlet of chlorin gas, a cup-like partition of sheet metal such as silver and dividing the latter chamber into two sub-chambers, said partition being provided with upper perforations and the lower portion thereof constituting a trap, one of said openings being located at the lower end of said trap, and a'valve proper operable by said diaphragm to control said trap opening.

5. A back pressure valve, comprising in combination, two chambers separated by a flexible diaphragm, one of them containing a pressure medium, a trap in the other of sold chambers and having a series of pertorations adjacent said diaphragm, one of said chambers having outside of said trap an inlet opening, and said trap having an outlet opening, a filtering medium surrounding said trap and located between said inlet opening and the said perforations of said trap, said trap being imperforate in the zone surrounded by said filtering medium, and a valve operable by said diaphragm to controlthe said outlet opening in said trap."

Signed at New York, N. Y., this 8" day of November, 1916.

CHARLES F. WALLACE. MARTIN F. TIERNAN. Witnesses:

BEATRICE Mmvrs, ABRAM BERNSTEIN

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