Fusible latch for holding open a self-closing viscous liquid drum valve

Claim 2

A guillotine-type, self-closing drum valve having a body with a cylindrically-arcuate seat and sliding shoe supported on side arms centered on a trunnion axis passing through the discharge passage of the valve, which shoe is eccentrically actuated to close by compression springs acting on the side arms adjacent to the trunnion, and reacting against the body of the valve adjacent to the outlet of the discharge passage, and which shoe is normally loaded by said compression springs to pressure seal the shoe against the seat in the closed position wherein the improvement comprises: a. a halter pivotally mounted on one end in each side arm outside the point of action of the compression springs from the trunnion axis on the side arm, and extending outside the body of the valve; b. a fusible link fixedly connected to the halter at the other end and having an aperture at its free end; and c. a pin fixedly mounted in the valve body adjacent the lower end of the outlet of the discharge passage for seating of the aperture of the fusible link thereon to hold the valve open against bias of the spring.

Claim 3

A guillotine-type drum valve having a valve body including an elbowed bore with a substantially circular discharge passage in fluid connection with said bore at one end thereof and a threaded pipe fitting in fluid connection with the bore at the opposite end thereof, trunnion bosses mounted in the outer sides of the body diametrically oposite each other at a location substantially intermediate between the pipe fitting end and the discharge passage end, said trunnion bosses mounted on a common trunnion axis and extending outwardly therefrom, a convex cylindrically-arcuate valve seat terminating the surface of the discharge passage end and centered about the axis of the trunnion pins, a valve shoe having a concave arcuate sealing face of the same radius of curvature as the arcuate seal slidingly applied thereon, a ball socket located in the back face of the valve shoe and in the back face of the seat and a steel ball seating in the socket therein; a valve-operating lever structure having spaced parallel side arms anchored at the forward corners thereof containing bores therein each loosely pivoted on the trunnion bosses, coil springs the axes of which are oriented in parallel relation With respect to the axis of the discharge passage located outside the body and offset in the direction for closing of the valve thereto, fixed spring seating lugs having clearance bores therein with axes substantially parallel to the axis of the discharge passage mounted to the body adjacent to and outside of the discharge passage end on the respective lines of action of the springs, opposite ends of said springs seating against respective spring shoes, spring shoe seats of semi-circular form cut in each side arm, spring shoes pivotally seating in respective shoe seats, slide rods coaxial with and on the line of action of the axis of each spring fixedly mounting at one end to the respective shoes and loosely sliding at the other end through respective bores in the lugs on the valve body, the slide rods serving as guides for the springs and maintaining square end seating thereof on the shoes, the improvement comprising a halter pivotally mounted on one end in each side arm outside the point of action of the compression springs from the trunnion axis on the side arm and extending outside the body of the valve, a fusible link fixedly connected to the halter at the other end and having an aperture at its free end, and a pin fixedly mounted in the valve body adjacent the lower end of the outlet of the discharge passage, for seating of the aperture of the fusible link thereon to hold the valve open against bias of the springs.

Claim 4

A guillotine-type drum valve having a valve body including an elbowed bore with a substantially circular discharge passage in fluid connection with said bore at one end thereof and a threaded pipe fitting in fluid connection with the bore at the opposite end thereof, trunnion bosses mounted in the outer sides of the body diametrically oposite each other at a location substantially intermediate between the pipe fitting end and the discharge passage end, said trunnion bosses mounted on a common trunnion axis and extending outwardly therefrom, a convex cylindrically-arcuate valve seat terminating the surface of the discharge passage end and centered about the axis of the trunnion pins, a valve shoe having a concave arcuate sealing face of the same radius of curvature as the arcuate seal slidingly applied thereon, a ball socket located in the back face of the valve shoe and in the back face of the seat and a steel ball seating in the socket therein; a valve-operating lever structure having spaced parallel side arms anchored at the forward corners thereof containing bores therein each loosely pivoted on the trunnion bosses, coil springs the axes of which are oriented in parallel relation With respect to the axis of the discharge passage located outside the body and offset in the direction for closing of the valve thereto, fixed spring seating lugs having clearance bores therein with axes substantially parallel to the axis of the discharge passage mounted to the body adjacent to and outside of the discharge passage end on the respective lines of action of the springs, opposite ends of said springs seating against respective spring shoes, spring shoe seats of semi-circular form cut in each side arm, spring shoes pivotally seating in respective shoe seats, slide rods coaxial with and on the line of action of the axis of each spring fixedly mounting at one end to the respective shoes and loosely sliding at the other end through respective bores in the lugs on the valve body, the slide rods serving as guides for the springs and maintaining square end seating thereof on the shoes, the improvement comprising a halter pivotally mounted on one end in each side arm outside the point of action of the compression springs from the trunnion axis on the side arm and extending outside the body of the valve, a fusible link fixedly connected to the halter at the other end and having an aperture at its free end, and a pin fixedly mounted in the valve body adjacent the lower end of the outlet of the discharge passage, for seating of the aperture of the fusible link thereon to hold the valve open against bias of the springs.

Claim 5

The device of claim 2 wherein the inner surface adjacent the discharge end of said valve is provided with a groove supporting a guard therein to prevent inserting of the fingers of the operator into said opening.