A valve (115, 115') for controlling flow of fluid about a well site component of a well site, the well site component having a flowline to pass the fluid therethrough, the valve (115, 115') comprising: a valve housing; a cage having holes (350, 354) therethrough positionable in selective fluid communication with the flowline, wherein the holes (350,354) comprise at least one inlet and at least one outlet; the cage provided with a cage plate at an end thereof, having a fluid passage therethrough, positionable in fluid communication with the flowline; characterized in that the valve (115, 115') further comprises a valve plate operatively connected between the valve housing and the cage, the valve plate having a sealing surface thereon, wherein the sealing surface comprises a notch and wherein the sealing surface comprises metal; and a spool assembly comprising a spool slidably positionable in the cage, the spool having a first end and a second end, defining a central passage therethrough, wherein the first end of the spool defines one of a key and insert receivable by the notch to form a seal therewith, wherein the spool comprises metal, the spool assembly selectively positionable in sealing engagement with the sealing surface of the valve plate to define a metal-to-metal sealing interface therebetween when the spool is disposed in an inlet position, the spool assembly movable between the inlet position defining a fluid intake path from the at least one inlet through and out from the fluid passage and an outlet position defining a fluid outtake path from fluid passage, through the central passage of the spool and out from the outlet, whereby the fluid is selectively diverted through the wellsite component via flowline. a valve housing; a cage having holes (350, 354) therethrough positionable in selective fluid communication with the flowline, wherein the holes (350,354) comprise at least one inlet and at least one outlet; the cage provided with a cage plate at an end thereof, having a fluid passage therethrough, positionable in fluid communication with the flowline; characterized in that the valve (115, 115') further comprises a valve plate operatively connected between the valve housing and the cage, the valve plate having a sealing surface thereon, wherein the sealing surface comprises a notch and wherein the sealing surface comprises metal; and a spool assembly comprising a spool slidably positionable in the cage, the spool having a first end and a second end, defining a central passage therethrough, wherein the first end of the spool defines one of a key and insert receivable by the notch to form a seal therewith, wherein the spool comprises metal, the spool assembly selectively positionable in sealing engagement with the sealing surface of the valve plate to define a metal-to-metal sealing interface therebetween when the spool is disposed in an inlet position, the spool assembly movable between the inlet position defining a fluid intake path from the at least one inlet through and out from the fluid passage and an outlet position defining a fluid outtake path from fluid passage, through the central passage of the spool and out from the outlet, whereby the fluid is selectively diverted through the wellsite component via flowline.