An aircraft fluid control valve is provided that includes a sleeve, a cap, first and second pistons, and first and second springs. The sleeve includes first and second inner chambers. Fluid inlet and outlet ports are disposed in the first sleeve wall. A high pressure reference port is in fluid communication with the base end and a low pressure reference port is in communication adjacent the cap end. The first piston has a center post, a base flange, and a piston head. The piston head is attached to the center post. The second piston (SP) has a SP center flange and a SP side wall. The SP side wall extends axially between a base end and a cap end. The first spring is disposed between the SP center flange and the cap. The second spring is disposed between the PH base flange and the SP center flange.

A solenoid valve includes: a valve body; a sleeve which the valve body is accommodated; a solenoid casing connected to the sleeve on a first end side in an axial direction of the solenoid valve, and is closed on a second end side opposed to the first end side in the axial direction; a solenoid molded body in the solenoid casing; a yoke including a tubular portion inside the solenoid molded body, a flange portion projecting radially outward from an end portion of the tubular portion on the second end side; a movable iron core, which moves in the axial direction inside the yoke. The valve body is moved with the iron core by energizing a coil of the solenoid molded body, and the flange portion has an annular outer peripheral surface that is continuous, and is disposed on the second end side of the solenoid molded body.

An aircraft fluid control valve is provided that includes a sleeve, a cap, first and second pistons, and first and second springs. The sleeve includes first and second inner chambers. Fluid inlet and outlet ports are disposed in the first sleeve wall. A high pressure reference port is in fluid communication with the base end and a low pressure reference port is in communication adjacent the cap end. The first piston has a center post, a base flange, and a piston head. The piston head is attached to the center post. The second piston (SP) has a SP center flange and a SP side wall. The SP side wall extends axially between a base end and a cap end. The first spring is disposed between the SP center flange and the cap. The second spring is disposed between the PH base flange and the SP center flange.

An aircraft fluid control valve is provided that includes a sleeve, a cap, first and second pistons, and first and second springs. The sleeve includes first and second inner chambers. Fluid inlet and outlet ports are disposed in the first sleeve wall. A high pressure reference port is in fluid communication with the base end and a low pressure reference port is in communication adjacent the cap end. The first piston has a center post, a base flange, and a piston head. The piston head is attached to the center post. The second piston (SP) has a SP center flange and a SP side wall. The SP side wall extends axially between a base end and a cap end. The first spring is disposed between the SP center flange and the cap. The second spring is disposed between the PH base flange and the SP center flange.

A cryogenic cylinder control system for regulating fluid within a cryogenic cylinder is disclosed. The system includes a pressure relief and vent module fluidly connectable to a head space above liquid within the cryogenic cylinder, a manual valve module fluidly connectable to the liquid within the cryogenic cylinder and to an external device, a solenoid valve module fluidly connectable to the manual valve module and to the head space within the cryogenic cylinder, a build-up coil fluidly connectable to the manual valve module and to the solenoid valve module, and a controller operatively connected to the solenoid valve module to control fluid flow through the solenoid valve module.