Cryogenic cylinder control system, globe valve, and solenoid valve

A solenoid valve assembly, comprising:

• a valve body comprising a valve seat and defining a flow passage;
• a cartridge mounted to and extending from the valve body, wherein the cartridge defines a cartridge cavity;
• a plunger slidably received by and configured to abut the cartridge, wherein the plunger comprises a plunger stem and plunger head, and wherein the plunger head is slidably received in the cartridge cavity;
• a seat disc holder slidably received by the cartridge, wherein the seat disc holder includes a plunger-contact surface and a seat-disc-engaging surface;
• a retainer fixedly attached to the seat disc holder to form a plunger-head cavity in which the plunger head is enclosed, wherein the retainer defines a bore through which the plunger stem slidably extends, wherein the plunger head is configured to engage the plunger-contact surface of the seat disc holder in a closed configuration of the solenoid valve assembly;
• a seat disc attached to the seat disc holder along the seat-disc-engaging surface;
• a spring extending between the cartridge and the plunger, wherein the spring is configured to push the seat disc, via the seat disc holder, toward the valve seat to bias the solenoid valve assembly toward the closed configuration at which the seat disc sealingly engages the valve seat to prevent fluid to flow through the flow passage;
• and
• an electromagnetic coil configured to draw the plunger toward an open configuration of the solenoid valve assembly when energized, wherein, in the open configuration, the seat disc is pulled away from the valve seat, via the seat disc holder, to enable the fluid to flow through the flow passage.

A solenoid valve assembly, comprising:

• a valve body comprising a valve seat and defining a flow passage;
• a cartridge mounted to and extending from the valve body, wherein the cartridge defines a cartridge cavity;
• a plunger slidably received in the cartridge cavity and defining a plunger passage;
• a pin contacting the cartridge and slidably at least partially extending through the plunger passage;
• a retainer attached to the plunger;
• a plate slidably received in the cartridge cavity, wherein the plate defines a bore through which the plunger and the retainer slidably extend;
• a poppet attached to the plate and defining a void in which the retainer is enclosed, wherein the poppet includes an inner surface configured to engage the retainer in a closed configuration of the solenoid valve assembly;
• a seat disc attached to the poppet and configured to engage the valve seat in the closed configuration at which the seat disc sealingly engages the valve seat to prevent fluid to flow through the flow passage;
• and
• a first spring received in the plunger passage and extending between the pin and the retainer, wherein the first spring is configured to push the seat disc, via the retainer and the poppet, toward the valve seat to bias the solenoid valve assembly toward the closed configuration;
• a second spring received in the cartridge cavity and extending between the retainer and the plate;
• an electromagnetic coil configured to draw the plunger toward an open configuration of the solenoid valve assembly when energized, wherein, in the open configuration, the seat disc is pulled away from the valve seat, via the plunger and the poppet, to enable the fluid to flow through the flow passage.