Freeze protection valve assembly

Claim 1

A freeze protection valve assembly comprising, in combination, (1) a reservoir having an inlet fitting to attach said reservoir to a segment of pipe of a water supply system and an outlet fitting to which can be attached a faucet permitting normal use of the water supply, said inlet and outlet fittings being positioned such that when attached to said water supply system the reservoir is maintained full of water when the outlet to the reservoir is closed, and (2) a valve disposed through the wall of the reservoir above the bottom of the reservoir, said valve comprising a unitary assembly of a valve body having a seat, a valve member movably disposed to engage said seat, an expandable chamber containing a liquid which expands in volume as the temperature increases and contracts as the temperature decreases resulting in the chamber extending as the temperature increases and retracting as the temperature decreases, a driving connection between said chamber and said valve member, lost motion means to maintain said valve member in said seat as the chamber extends or retracts with changing temperatures above a selected minimum temperature, and adjustable stop means limiting the operation of the lost motion means permitting adjustment of the minimum temperature above which the lost motion means maintains said valve member in said seat.