Abstract: The invention relates to a combination valve and back pressure valve which in one embodiment performs as a two-way check valve, and in another embodiment performs as a back pressure valve. The invention contains both apparatus and method claims. The valve includes a cylindrical member having an inlet port and an outlet port, with a bore therethrough. A valve sleeve is disposed within the bore. A valve stem is also slidably disposed within the bore. A selective dis-attachment assembly is incorporated into the valve and includes pre-selected shear pistons.

Abstract: An apparatus for measuring the rates of flow of fluid through a line, which is characterized by a fluid driven turbine whose axis may be pivotably varied throughout an arc from being parallel to the direction of fluid flow to a position perpendicular to the direction of fluid flow. By varying the angle at which the fluid flow impinges on the turbine wheel the "K factor", that is the rate of turbine rotation per unit of fluid flow can be adjusted so as to adapt the flowmeter to differing fluids (such as, steam, air and other gaseous fluids, and, both low and high density liquids). Also, by varying the angle at which the fluid flow impinges on the turbine wheel the rate of turbine rotation per unit of fluid flow can be adjusted to adapt the flowmeter to a very wide range of flow rates (high rangeability).