US1091803A - Automatic valve for dry-pipe fire-sprinkler systems. - Google Patents

Description

W. O. BRYCE.

AUTOMATIC VALVE FOR DRY PIPE FIRE SPRINKLER SYSTEMS.

APPLICATION FILED JUNE 21, 1913.

1,@91,8@3 Patented Mar. 31, 1914.

H /ZZ/4M C BRYCE Witnesses: Inventor prevent water colummng,

- tually prevent the with.

para" a FFTQG WILLIAM C. BRYCE, 01E MONTREAL, QUEBEC, CANADA.

aoaasos.

Application filed June 21, 1913.

T all whom it may concern:

Be it known that 1, WILLIAM C. BRYCE, a subject of the King of Great Britain, residing at 250 Peel street, Montreal, Province of Quebec, Canada, have invented certain new and useful Improvements 111 Automatic Valves for Dry-Pipe Fire-Sprinkler Systems; and-I do hereby declare that the following is a full, clear, and exact description of'the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention to be hereinafter described relates to automatic valves for dry pipe fire sprinkler systems.

In order to more clearly disclose the construction, operation, and use of the invention, reference should be had to the accompanying drawings forming part of the resent application.

The main objects'of the invention are, to reduce a single-chamber, straight-way valve, for sprinklersystems, which will offer a minimum of resistance to the flow of the water when in use, which will eflectively any springs or similar easily broken parts in its construction, and which will contain all of the operative and adjusting means of the valve within the valve casing so as to efiecvalves being tampered The single figure of the drawings is a central, vertical, longitudinal, cross section through the invention, with valves seated.

Referring to the drawings in detail, 1 indicates the upper, and 2 the lower casting or section of the valve casing, each provide with an attaching flangeficompleinental to the flange of the other and adapted to be securely clamped together by bolts and nuts in the usual manner. vThe lower casing section is provided with an inlet passage 3 leading frointhe water main and has a by-pass 4 leading laterallyfrom this passage toward one side of the casing, for a purpose to be later described. Within the section 2 are mounted all operative parts, thus insuring alinement of the parts and, also, insuring no outside levers, &c., to be tampered with.

The upper section 1 is provided with a hand hole 5 closed by a removable cover plate 6 bolted in place in the usual manner. Also, this upper section is connected direct to the riser by passage 7 in the usual manner. The result is that it is absolutely necessary to Specification of Letters Iatent.

will not employ ,valve 8 from flying open.

Patented Mar. 3ft rare.

Serial No. 775,125.

securely bolt the cover 6 in correct operative osition beforepumping in the air pressure, otherwise, the air will escape as fast as it is pumped in. Thus, no water damage can result from defective ment of the cover plate.

The inlet passage 3 is provided with the usual valve seat which receives a valve 8 of well known construction which is pivoted to a lever 9-fulcrumed-at 10 in the lower casing section 2. The opposite free end of the lever is'provided with a bore to receive the threaded end of'a trigger bolt 11 which may be adjusted toward and from the lever end and secured in such adjusted positions by means of set nuts 12 threaded thereon, as will be clear. The tip or point 13 of this trigger bolt engages a toe 14 extending from one branch of a bell crank'lever 15 fulcrumed at 16 in the lower casing section 2-. To the free end of the other branch of the bell crank lever is pivotally connected a. differential valve 17 which closes that end of bypass 4: which opens into the lower casing section 2. This valve 17 is made with a differential ratio of 1 to 6, 2'. '6. with such relative upper and lower operative surfaces that an air pressure oflO pounds in the valve casing will counterbalance a water pressure of pounds in the by-pass 4; and passage 3.' Thus,

' at slightly over 10 pounds pressure in the casing, the valve .17 will be kept closed against a' 60 pound water pressure in the by-pass 4 and inlet passage 3. On the other hand, the opposite operative surfaces of valve 8 beingpractically the same in area, it is necessary. to have the trigger bolt 11 engaged beneath the toe 14 .to prevent the The force exerted by bolt 11 on toe l t-1s at right angles-to the axis of rotation of the bell crank lever 15.

of valves the toe 13 is placed slightl ofi center of pivotal point 16 resulting in slight lifting force on bell crank lever 15. Now, as soon as the air pressure in the casing drops below the predetermined point, the water pressure in the by-pass will swing the valve 17 from its seat, thereby rocking the bell crank 15 and disengaging toe 14 the tip 13 of the trigger bolt 11. At this point the pressure on the under face of the valve 8 will drive it open and the water will rush into the riser and branches in the usual manner. Due to the substantial equality of fastening or misplacefrom operative surfaces of valve 8, there will be no probable tendency to water 'columning. However, should there be any such tendency, it will first affect the diflerential valve 17 and drive it shut, due to the ative area of its upper face. The toe let will then be in the dlrect path of the trigger bolt 11 and will be engaged thereby, should the valve 8 drop toward its seat. This engagement will, obviously, prevent seating of valve 8, thereby absolutelypreventingany possibility of water columning. As the tip 13 wears, or to keep a tight joint between the valve 8 and its seat, adjustment of bolt 11 will be amply suflicient.

It isthought that the construction, operation, and use of the invention will be clear from the preceding detailed description.

Changes may be made in the construction, arrangement, and disposition of the several parts of the invention without in any way departing from the field and scope of the same, and it is meant to include all such within this application wherein only a preferred form has been disclosed.

Having thus fully what I claim as new Letters Patent is: i

1. In a single-chamber, straight-way valve of the character described, a Valve casing section provided with an inlet passage and a by-pass, a lever pivotally mounted in said section, a valvecarried thereby, to close said passage, a trigger bolt carried by said lever, a bell crank lever mounted in said section and adapted to engage said described my invention, and desire to secure by trigger bolt, and a differential valve carried by said bell crank lever and adapted to close said by-pass.

by-pass,

greater opersection, a valve carried thereby and adapted and adapted 2, In a single-chamber, straight-way valve,

of the character described, a valve section I casing provided with'an inlet passage and a lever 'pivotally mounted in said to close said passage, a trigger bolt mounted in the free end of said lever and provided with an off set tip, a bellcrank lever fulcrumed in saidsection and provided with a toe adapted to engage said tip, and a-difierential valve carried by said bell crank and adapted to close said by-pass.

3. In a single-chamber, straight-way valve; a single valve chamber provided with alined inlet and outlet passages; a by pass leading from the inlet passage and communicating with the valve chamber, at a point a little below the delivery end of the inlet passage; a lever pivotally mounted in said valve chamber; a valve carried thereby, and adapted to close the delivery opening of said inlet; a second lever mounted in said casing; a diflerential valve carried thereby and adapted to close said by pass; connections betweensaid levers; a trlgger bolt carried by the first lever and engaged by the second lever; and means for adjusting said trigger bolt; the said valves, their connecting and cooperating parts, means, being contained wholly within the valve casing, to prevent their being tampered with.

In witness whereof I have hereunto Set my hand in the presence of two witnesses.

WILLIAM G. BRYCE.

and adjusting

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