US1954927A - Automatic safety gas valve - Google Patents

Description

April 17, 1934. J. J. FULLER 1,954,927

AUTOMATIC SAFETY GAS VALVE Filed A ril. 22, 1933 invenfor Jbiz/z JFuZZe /7 Patented Apr. 17, 1934 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a safety valve for gas lines, the general object of the invention being to provide means for preventing the escape of gas from burners and the like after the gas pressure has been reduced and then starts to flow again.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding 5 parts throughout the several views, and in which:-

Figure 1 is a vertical sectional view through the device.

Figure 2 is an elevation. Figure 3 is a view of the member for resetting the main valve after the same has been closed.

In this drawing, the numeral 1 indicates a casing which is formed with the inlet nipple 2 at one end thereof and the outlet nipple 3 at the 5 other end thereof. Within the casing is arranged a nipple 4 which is in communication with the nipple 2 and an angle-shaped partition 5 is also located in the casing and is in communication with the outlet nipple, the top or horizontal wall of said member 5 having an opening 6 therein which is beveled to form a valve seat. This seat is adapted to be engaged by the main valve '7, the stem 8 of which passes through one or more brackets 9 attached to an interior wall of the casing. A spring 10 encircles the stem and bears against the bracket 9 and against the valve 7 and tends to hold said valve on its seat. A head 11 is formed on the upper end of the stem and is adapted to be engaged by an end of a rod 12 which holds the valve off its seat, as shown in Figure 1.

The other end of the rod 12 is pivoted to an arm 13 which is pivoted to the top wall of the casing,

as shown at 14, the arm sloping downwardly and toward the outlet end of the casing and has a cup-shaped valve 15 attached to its lower end which is adapted to seat on the inner end of the nipple 4 by the action of gravity and the weight of the parts. The forward end of the 5Q rod 2 is guided in the depending bracket 16.

Thus it will be seen that when the device is placed in a gas line for supplying gas to burners of various kinds, the flow of gas will hold the valve 15 off its seat so that the gas can enter the '55; casing and as the valve 7 is raised off its seat by the rod 12 engaging under the head 11, the gas will flow through the casing to the burners. However, if the flow of gas should cease or the pressure of the flow become so low as to be insufficient to hold the valve 15 off the nipple 4, said valve would close and the resultant movement of the arm 13 would pull the rod 12 from under the head 11 so that the spring 10 would move the valve 7 upon the seat 6 and thus close communication between the casing and that part 06 of the line leading to the burner. Then if the gas started to flow again, it could not pass from the casing, as the valve 7 has closed the opening 6.

When it is desired to retract the parts to permit the gas to flow, the handle 17 of a rod or shaft 18, journaled in the casing, is turned to cause the arm 19 on the shaft to engage the head 11 so that the stem 8 and valve 7 will be raised and the free end of the rod 12 will pass under the head due to the fact that the valve 15 has been moved by the flow of gas into the casing. The arm 19 is provided with an arcshaped notch 20 for receiving part of the stem 8 as the arm moves upwardly to engage the head 11, and a stuffing box is provided for the shaft 18 where it passes through the casing.

Thus it will be seen that I have provided simple means for preventing the escape of gas at burners when the gas pressure has failed and the flame at a burner has become extinguished so that if the pressure should commence to flow again, the gas would escape from the burner which would endanger occupants of the building in which the burners are located.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is V A safety valve for a gas line comprising a casing having an inlet nipple at one end thereof and. an outlet nipple at the other end thereof, a nipple within the casing and in communication with the inlet nipple, an angle-shaped partition in the casing for separating the outlet nipple from the interior of the casing, said partition having a horizontal part having an opening therein, a valve for closing said opening, a stem on said valve extending upwardly, guiding means for the stem, a spring for normally holding said valve in closed position, a head on the stem, an arm pivoted to the top of the casing and extending downwardly and forwardly, a cup-shaped valve on the lower end of the arm for fitting over the nipple within the casing under the action of gravity and moved to open position by the flow of gas into the casing, a rod pivoted to the arm and having its free end adapted to engage under the head of the stem to hold the spring pressed valve in open position, guiding and supporting means for the rod depending from the top of the casing and engaging the rod adjacent the free end thereof, said rod moving longitudinally to a position to release the stem when the cup-shaped valve drops to closing position and means for raising the spring pressed valve from the exterior of the casing to permit the end of the rod to engage under the head of the stem, such means including a shaft passing through a part of one wall of the casing, a handle on the outer end of the shaft and an arm on the inner part of the shaft having a recess in its free end for receiving portion of the stem, when the shaft is rocked to move the arm upwardly against the stem, whereby upward movement of said arm will move the stem and the valve upwardly against the action of the spring.

JOHN J. FULLER.

Images