Patent ID: 11946550
Assignee: WEED INSTRUMENT COMPANY, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  G  Y | IPC F

Claim 19:
20. A passive overpressure protective device, consisting essentially of:
a valve body having a first valve port, a second valve port, an interior passage communicating between the first and second valve ports, and a valve having an open condition in which pressure is communicated between the first and second valve ports and a closed condition in which pressure is not communicated between the first and second valve ports;
a valve stem mechanically coupled to the valve and configured for linear translation proximal to and distal from the valve body;
at least one vacuum-filled bellows mechanically coupled to the valve stem, such that movement of the bellows responsive to an ambient pressure change passively moves the valve stem to change the valve between the open condition and the closed condition;
a coupling member that mechanically couples the valve stem and the bellows; and
a friction collar configured to set an initial linear position of the valve stem corresponding to a pressure setpoint at which the valve stem changes the valve to the closed condition.