초록 ▼

The present invention, in one embodiment, has a valve body within which is mounted a stem support; a plunger with a stem which is movably mounted for movement in the stem support to move a rounded head of the plunger to sealingly contact a sealing surface within the valve body thereby preventing flo

The present invention, in one embodiment, has a valve body within which is mounted a stem support; a plunger with a stem which is movably mounted for movement in the stem support to move a rounded head of the plunger to sealingly contact a sealing surface within the valve body thereby preventing flow through the valve; a piston recess in the stem which receives and holds a top portion of a piston; the piston (or some part connected thereto or formed integrally thereof) held immobile by one or more holding devices (e.g. bars, plates, pins, rods, etc.) which, in one embodiment extend through the piston and into the stem support or into a piston housing and which are frangible, erodible, degradable or destroyable either by action of a hydrostatic head of fluid on a bottom surface of the piston or by chemical or thermal attack and degradation.

대표청구항 ▼

A valve for controlling flow of a fluid in a conduit in which the valve is emplaced, the valve comprising a body with a first end and a second end and a hollow central fluid flow channel therethrough, and an inner body sealing surface at the first end thereof, a plunger with a stem movably disposed

A valve for controlling flow of a fluid in a conduit in which the valve is emplaced, the valve comprising a body with a first end and a second end and a hollow central fluid flow channel therethrough, and an inner body sealing surface at the first end thereof, a plunger with a stem movably disposed in the body for movement with respect thereto, the stem having a first end and a second end, a sealing head on a first end of the stem of the plunger for restricting fluid flow through a top of the body\s hollow central fluid flow channel and for sealingly contacting the inner body sealing surface to prevent fluid flow through the valve, a piston with a first piston end and a second piston end, the first piston end secured to the stem, a piston housing in which the piston is movably mounted, a portion of the second piston end movably mounted in the piston housing, the piston housing having a first housing end and a second housing end, the first piston end projecting from the first housing end, at least one holding member releasably preventing piston movement until it is broken or degraded, the second housing end having a sealed fluid chamber therein, the second piston end having a piston plate across and sealingly closing off the fluid chamber, the fluid chamber having a fluid therein compressible by forced movement of the piston plate, and the piston plate having an exterior exposed to a hydrostatic head of fluid exterior to the valve such that the hydrostatic head of fluid, upon reaching sufficient force, moves the piston plate to compress the fluid, thereby moving the sealing head to restrict flow through the valve.