Shut-off valve and method for using same
OwnerJames V. Polselliinventor
Life of this patent
Estimating the term…
Abstract
A valve for automatically shutting off the flow of fluid in the event of a malfunction. The valve is provided with a body having an internal valve cavity in which a valve spool translates. The valve spool serves to control the flow of fluid between and inlet and outlet and is shiftable between an open and a closed position. The inlet and output pressures are monitored by internal ports to sense the occurrence of a malfunction and to automatically shift the valve to the closed position. A reset mechanism is also provided allowing the valve spool to be returned to the open position.
Claims18
Automatic shut-off valve for controlling the pulsating flow of fluid in a line, comprising:
- (a) a body having a formed therein:
- a valve cavity having a first end, a second end, and central region;
- a fluid input port having a fluid inlet coupled to a source of intermittingly pulsating fluid and a fluid output port having a fluid outlet coupled to the line, both fluid input and fluid output ports communicating with the valve cavity central region;
- an outlet pressure port connecting the valve cavity first end to the fluid outlet;
- and
- an inlet pressure port connecting the valve cavity second end to the fluid inlet;
- (b) valve means for controlling flow between the fluid input and output ports, said valve means sealingly cooperating with the valve cavity and shiftable relative thereto from an open position in which the input and output ports are coupled to a closed position where said flow is shut-off;
- and
- (c) a normally closed check valve placed between the fluid inlet and the fluid outlet, downstream of the inlet pressure port and upstream of the outlet pressure port, said check valve opening in response to the incoming pulsating fluid flow, and closing thereafter to prevent backflow through said valve;
- whereby the shut-off valve will normally transmit liquid from the fluid inlet to the fluid outlet passing through the check valve, input port, valve cavity central region and output port, resulting in a pulsating pressure in both the first and second ends of the valve cavity such that the valve means is maintained in the open position, said valve means shifting to the closed position in the event of a broken link resulting in a reduction in the fluid pressure causing the valve means to shift to the closed position due to the increase pressure in the valve cavity second end from the check valve restriction.
An automatic broken line shut-off valve for attachment to a feeder block in a pulsating flow modular divider valve system for controlling the feeder block output, said shut-off valve comprising;
- (a) a body provided with:
- a valve cavity having a first end, a second end, and a central region;
- a fluid input port having a fluid inlet for communicating with the feeder block output, and a fluid output port having a fluid outlet, both input and output ports communicating with said valve cavity central region;
- an outlet prepssure port connecting the first end of the valve cavity to the fluid output port;
- and
- an inlet pressure port connecting the second end of the valve cavity to the fluid inlet;
- (b) valve means within the valve cavity for controlling the flow of liquid between inlet and output ports, said valve means sealingly cooperating with the valve cavity and shiftable relative thereto from an open position in which the input and output ports are coupled to a closed position where said flow is shut off;
- (c) a normally closed check valve placed between the fluid inlet and the fluid outlet, downstream of the inlet pressure port and upstream of the output pressure port, said check valve opening in response to the incoming pulsating fluid flow, and closing thereafter to prevent backflow through said valve;
- and
- (d) reset means for moving the valve means back to the open position.
Dependencies are inferred from the claim text.