Vibration resistant pressure actuated vacuum breaker

Details Vibration resistant pressure actuated vacuum breaker Vibration resistant pressure actuated vacuum breaker

1979-10-09

1981-06-16

Cline, William R.

Fluid handling

Removable valve head and seat unit

Threaded into valve casing

137526, 137529, 137542, 137522, 251 65, F16K 3111, F16K 1700

Patent

active

042731534

ABSTRACT:
A vacuum breaker for use on a moving tank for allowing atmospheric air to enter the tank to relieve a reduced pressure condition in the tank. The vacuum breaker has a light-weight closure assembly including a closure member of relatively large area. The closure assembly is normally held closed by permanent magnets. The magnets and the light-weight construction of the closure assembly substantially prevent the vacuum breaker from opening due to vibration of the moving tank. However, the vacuum breaker opens readily in response to a relatively slight reduced pressure in the tank because of the large area of the closure member. The permanent magnets are shielded from undesirable proximity of ferrous objects to prevent the magnets from being drained. The vacuum breaker may be opened manually to test for a positive pressure condition in the tank.

REFERENCES:
patent: 422385 (1890-03-01), Dennedy
patent: 487673 (1892-12-01), Jenks
patent: 1819827 (1931-08-01), Thwaits
patent: 2016278 (1935-10-01), Ehlers
patent: 2405241 (1946-08-01), Smith
patent: 3462119 (1969-08-01), Smith
patent: 3495620 (1970-02-01), Raimondi et al.
patent: 3605132 (1971-09-01), Lineback
patent: 3688794 (1972-09-01), Bird et al.
patent: 3698427 (1972-10-01), Baranowski, Jr.
patent: 3729020 (1973-04-01), Koci et al.

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