Abstract: The invention relates to an adjustable mechanical valve assembly used to control fluid flow in a pipe system that compresses air bubbles in the fluid to allow a more dense volume of fluid to exit the control valve. The valve assembly comprises a housing, a valve member, a spring member, and a retaining member. The spring member is configured to limit radial movement while allowing axial movement, thereby eliminating the need for a separate element (such as a rod) to limit radial movement.

Abstract: The invention relates to a mechanical valve assembly used to control a fluid (e.g., gas, liquid, etc.) to provide at least one of a check valve control feature and flow range control feature. When unwanted low flows are present, the valve remains closed and jumps open only at higher desired flow rates. The valve then closes when the forces at the input and output equalize, and the process repeats. Such allows fluid delivered to a flow meter in larger segregated bursts, rather than steady low flows that cause metering errors.

Abstract: The invention relates to a mechanical valve assembly used in the control of a fluid (e.g. gas, liquid, etc.) to provide at least one of a check valve control feature and flow range control feature. When unwanted low flows are present, the valve remains closed and jumps open only at higher desired flow rates. The valve then closes when the forces at the input and output equalize and the process repeats. Such allows fluid delivered to a flow meter in larger segregated bursts, rather than steady low flows that cause metering error.