Swing check valve with internally balanced disc

Details Swing check valve with internally balanced disc Swing check valve with internally balanced disc

1981-03-16

1982-10-12

Cohan, Alan

Fluid handling

Line condition change responsive valves

Direct response valves

137554, 251 82, 251 77, 251 634, 251 62, F16K 1518, F16K 3144, F16K 1500

Patent

active

043533906

ABSTRACT:
A check valve construction is provided which is free of friction imparting elements such as a labyrinth seal or a stuffing box with internal packing having an external mounted counterweight. One embodiment is of the power assist type constructed with convenient means for local daily testing the free swing portion of the check valve while another embodiment includes a manual test device. The valves may include friction free disc position indicators.

REFERENCES:
patent: 1463103 (1923-07-01), Thorsten
patent: 2048088 (1936-07-01), Wagner
patent: 2900998 (1959-08-01), Lortz
patent: 3106220 (1963-10-01), Hose
patent: 3448759 (1969-06-01), Peerman
patent: 3532320 (1970-10-01), Fisch
patent: 3883111 (1975-05-01), Jourdan
patent: 3972504 (1976-08-01), Di Sabatino et al.
patent: 4029290 (1977-06-01), Karpenko

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