Abstract: A valve assembly and system designed to enable an operator to withdraw a sample of a liquid from a source, typically for collection in a collection vessel. The valve assembly includes a valve housing, a sleeve secured to the valve housing and having an inner surface being at least partially threaded for mating with a threaded section disposed on the valve stem body. The valve stem has an internal longitudinal bore, a sealing boot, circumferential seals, and openings to the bore, and is movable between an open position (wherein the fluid flows from the source through the valve assembly) and a closed position (wherein the valve stem prevents the fluid from flowing from the source into the valve assembly).

Abstract: A pinch clamp to restrict flow in a flexible tube or hose is provided. The pinch clamp includes two elongated pinching members that are pivotally connected at one end with a threaded tightening member at the other end for selectively securing the pinching members in a closed position when the pinching members are pivoted toward each other. The inner cooperating faces of elongated pinching members have flat cooperating surfaces for engaging the flexible tube or hose.

Abstract: A pinch clamp to restrict flow in a flexible tube or hose is provided. The pinch clamp includes two elongated pinching members that are pivotally connected at one end with a threaded tightening member at the other end for selectively securing the pinching members in a closed position when the pinching members are pivoted toward each other. The inner cooperating faces of elongated pinching members have flat cooperating surfaces for engaging the flexible tube or hose.