Valve control assembly

A valve control, comprising:

• a valve unit that comprises separable cylindrical members forming a stack;
• a pair of valves disposed in the stack and operable to control flow of fluid between the separable cylindrical members;
• and
• a support unit that comprises a pair of end caps disposed in contact with opposite ends of the stack;
• a detent in each of the separable cylindrical members;
• and
• an alignment rod that engages with the detents to clock the separable cylindrical members with one another and with the pair of end caps,
• wherein loading the pair of end caps generates a compression force to squeeze the separable cylindrical members together.

A valve control, comprising:

• a valve unit that comprises separable cylindrical members forming a stack;
• a pair of valves disposed in the stack and operable to control flow of fluid between the separable cylindrical members;
• and
• a support unit that comprises a pair of end caps disposed in contact with opposite ends of the stack,
• wherein loading the pair of end caps generates a compression force to squeeze the separable cylindrical members together, and
• wherein the pair of valves are balanced valves.

A valve control, comprising:

• a valve unit that comprises separable members forming a stack;
• valves disposed in the stack and operable to control flow of fluid between the separable members;
• and
• a support unit that comprises end caps disposed in contact with opposite ends of the stack,
• a manifold removably replaceable from a recess in the separable cylindrical members,
• wherein loading at least one of the end caps generates a compression force to squeeze the separable members together,
• wherein flow pathways allow fluid to flow from the manifold into the separable cylindrical members.

A valve control, comprising:

• a valve unit that comprises separable members forming a stack;
• valves disposed in the stack and operable to control flow of fluid between the separable members;
• and
• a support unit that comprises end caps disposed in contact with opposite ends of the stack,
• a detent in each of the separable cylindrical members;
• and
• an alignment rod that engages with the detents to clock the separable cylindrical members with one another and with the pair of end caps,
• wherein loading at least one of the end caps generates a compression force to squeeze the separable members together.

A system, comprising:

• a control valve with a pneumatic actuator;
• and
• a valve control comprising a stack of cylindrical members, each having a detent, an alignment rod that engages with the detents to clock the stack of cylindrical members, a pair of moveable balanced valves disposed inside of the stack of cylindrical members, and a fastening mechanism that creates compressive forces to a pair of end caps of the stack of cylindrical members,
• wherein the moveable valves are operable to regulate flow of a first inlet gas into the valve control to cause the pneumatic actuator to move in response to pressure of a second inlet gas in to the valve control.