Purging Mechanism for a Hemi-Wedge Valve
The present invention is directed to a technique of purging unwanted particles from the interior of a valve body. Inlet and outlet ports are formed in the valve housing to allow for circulation of the fluid within the valve body. The flow path of the fluid is isolated from the main fluid flow path when the valve is in the open or closed position. Additionally the pressure of the fluid is at a level higher than that of the main fluid flow.
1 . A valve comprising:
a housing having a fluid inlet and a fluid outlet;
a main flow path connecting the fluid inlet to the fluid outlet;
a rotatable hemi-wedge valve closure member mounted within the housing;
a valve body core defining a portion of the flow path;
a downstream portion of the valve body core having a first sealing surface;
the upstream portion of the outlet having a second sealing surface; and
the hemi-wedge rotatable between an open position allowing for the unobstructed flow of fluid through the valve and a closed position in which the upstream surface of the hemi-wedge engages the first sealing surface and the downstream surface of the hemi-wedge engages the second sealing surface, a secondary fluid inlet port in the housing for connection to a source of a second fluid under pressure, a secondary fluid outlet port in fluid communication with the secondary fluid inlet port for returning the pressurized secondary fluid to its source, the fluid inlet port and outlet ports being isolated from the main flow path when the valve is in the open or closed position.
2 . The valve of claim 1 further including a fluid tank with fluid located therein, a pump connected between the secondary fluid inlet port and the fluid tank, and a return conduit connected between the secondary outlet port and the fluid tank for recirculating the fluid back to the tank.
3 . The valve of claim 2 further including a filter and an adjustable choke valve in the return conduit.
4 . The valve of claim 2 further including a branch conduit located between the main fluid pipeline and the fluid tank to pressurize the contents of the tank.
5 . The valve according to claim 2 further including pressure sensors at the inlet and outlet portions of the valve, a pressure sensor in the return conduit, a microprocessor that receives electrical signals from the pressure sensors, said microprocessor operable to regulate the variable choke valve to maintain the pressure of the secondary fluid higher than the main fluid flowing through the valve.
6 . The valve according to claim 6 , further including a battery connected to the microprocessor, and a solar panel charging mechanism connected to the battery for recharging the battery.
7 . A valve compromising:
a housing having fluid inlet and a fluid outlet;
a main flow path connecting the fluid inlet to the fluid outlet;
a rotatable ball valve closure member mounted within the housing;
the upstream portion of the outlet having a sealing surface; and
the ball valve rotatable between an open position allowing for the unobstructed flow of a fluid through the valve and a closed position;
an inlet port in the housing for connection to a source of a second fluid under pressure, the fluid inlet port being isolated from the flow path when the valve is in the open or closed position; and
a fluid outlet port in fluid communication with the inlet port for returning the second fluid under pressure to its source.
8 . A valve comprising:
a housing having a fluid inlet and a fluid outlet;
a main flow path connecting the fluid inlet to the fluid outlet;
a rotatable hemi-wedge valve closure member mounted within the housing;
the upstream portion of the outlet having a sealing surface; the hemi-wedge rotatable between an open position allowing for the unobstructed flow of fluid through the valve and a closed position, fluid inlet port in the housing for connection to a source of a second fluid under pressure, a secondary fluid outlet port in fluid communication with the secondary fluid inlet port for returning the pressurized secondary fluid to its source, the fluid inlet port and outlet ports being isolated from the main flow path when the valve is in the open or closed position.
9 . A method of cleaning the interior of a valve body comprising:
forming inlet and outlet ports for a secondary fluid in the valve body;
isolating the inlet and outlet ports from the main fluid flow path when the valve is in the open or closed position;
supplying a fluid to the inlet port at a pressure greater than that of the main fluid; and
returning the fluid to a reservoir tank.