Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1982-01-19
1984-07-17
Walton, George L.
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
60527, 126420, 137216, 137468, 236 93R, 236100, 237 80, 251 11, F16K 1700, G05D 2302
Patent
active
044600062
ABSTRACT:
The freeze protection valve includes a valve housing (A) which has a bore (20) through a lower wall portion (22) thereof to define a freeze drain outlet (B). A valve assembly (C) including a valve cup (50), a valving element (54), and a valve element biasing spring (56) is biased away from the valve housing lower wall portion by a valve cup spring (60). A thermal sensing assembly (D) including a thermal sensing element (82) which is disposed closely adjacent the valving element urges the valve assembly toward the lower wall portion as the temperature of fluid around the thermal element increases and allows the valve cup biasing spring to move the valving element away from the lower wall portion as the fluid around the thermal sensing element cools below a preselected temperature. In this manner, the valve assembly opens the freeze drain outlet in response to the fluid at the bottom of the valve housing adjacent the valve assembly dropping below a preselected temperature. A discharge stem (30) extends downward from the valve housing lower wall portion to provide an outlet path for fluids discharged through the freeze drain outlet. A cross bore (100) extending horizontally through the discharge stem immediately adjacent the freeze drain outlet provides an air break (E) between the freeze drain outlet and any fluids in the discharge stem bore to prevent discharged fluids which may have become contaminated from being drawn back into and mixed with the fluids in the freeze protection valve.
REFERENCES:
patent: 1268648 (1918-06-01), Van Meter
patent: 3158169 (1964-11-01), Smith
patent: 3333527 (1967-08-01), Bender
patent: 3369556 (1968-02-01), Allderdice
patent: 3887159 (1975-06-01), Obermaier et al.
patent: 3961606 (1976-06-01), Wong
patent: 3965922 (1976-06-01), McCornack
patent: 4036433 (1977-07-01), Wagner et al.
patent: 4066090 (1978-01-01), Nakajima et al.
patent: 4128203 (1978-12-01), Maltby
patent: 4296770 (1981-10-01), Rice
Eaton Corporation
Walton George L.
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