Modular valve apparatus and system

A manifold pressure measurement module, comprising:

• a manifold base having a first pressure line inlet port for connection to a first pressure line containing positively pressurized gas, a second pressure line inlet port for connection to a second pressure line containing negatively pressurized gas, a third inlet port for venting to atmospheric pressure, and a fourth inlet port for connection to a control chamber of a pneumatically actuated diaphragm pump;
• first, second third and fourth valve assemblies, each mounted to a valve assembly receiving station on the manifold base;
• a controller mounted to the manifold base and connected to the four valve assemblies;
• the manifold base configured to fluidically connect the first pressure line inlet port to a first inlet of the first valve assembly, to fluidically connect the second pressure line inlet port to a first inlet of the second valve assembly, to fluidically connect the third inlet port to a first inlet of the third valve assembly, and to fluidically connect the fourth inlet port to a first inlet of the fourth valve assembly;
• the manifold base also configured to connect valve cavities of each valve assembly to respective pressure sensing ports of the manifold base, and to connect each of the valve cavities to a reference reservoir of known volume;
• the first, second, third and fourth valve assemblies configured to be selectively electrically actuated by the controller to open or close communication between the valve cavities of each of said valve assemblies and the first inlets of each of said valve assemblies;
• the controller comprising first, second, third and fourth pressure sensors mounted on a control board, the pressure sensors configured to form a reversible sealed connection respectively with the pressure sensing ports of the manifold base;
• wherein the controller is configured to operate the first, second, third and fourth valve assemblies to charge the reference reservoir with positive or negative pneumatic pressure, or to open the reference reservoir to atmospheric pressure, and to fluidically connect the reference reservoir with the control chamber of the diaphragm pump to equalize pressures between the control chamber and the reference reservoir, and to record pressures at one or more of the pressure sensing ports before and after pressure equalization.