Systems and methods for measuring blood pressure

A valve-chamber assembly, comprising:

• a valve comprising a high pressure cavity, a low pressure cavity, a first channel providing a gas pathway between the high pressure cavity and the low pressure cavity, and a second channel providing a gas pathway between the low pressure cavity and a valve output;
• a channel cover and a first pressure ring located within the high pressure cavity;
• a spring exerting an upward force on the channel cover and the first pressure ring to create a first seal between the high pressure cavity and the first channel;
• and
• a rod extending from the low pressure cavity to the high pressure cavity via the first channel and exerting a downward force on the channel cover to provide a gas pathway between the high pressure cavity and the first channel.

A valve-chamber assembly having a fastening assembly, the fastening assembly comprising:

• a base;
• a bolt fitted through an open portion of the base;
• a torque limiter located within the base and at least partially surrounding a head of the bolt;
• an O-ring located between at least a portion of the torque limiter and the base;
• and
• a latch coupled to the base,
• wherein if a torque threshold is not satisfied, rotational movement of the latch in a first direction causes the bolt to rotate in the first direction and advance in a second direction, and
• wherein if the torque threshold is satisfied, rotational movement of the latch in the first direction causes the head of the bolt to slip through the torque limiter.