Check valve

Details Check valve Check valve

1977-05-16

1979-02-27

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

128214R, 137517, 137550, 137859, 210117, F16K 1514

Patent

active

041413792

ABSTRACT:
An improved check valve is disclosed for use in a system for sequentially delivering primary and secondary solutions through a common conduit. The check valve comprises a hollow housing with an inlet and an outlet connected to an enlarged intermediate portion. Sealed at its periphery in the enlarged portion is a flexible diaphragm characterized by having foraminous means in at least its outer portion and imperforate means in its central portion. The imperforate means is spaced from a valve seat surrounding the passage at the inner end of the inlet so that when the primary solution flows from the inlet to the outlet, it will pass freely around the imperforate means and through the foraminous means. When an increase in pressure, even though slight, is exerted against the diaphragm caused by flow of the secondary solution in the direction of the outlet to the inlet, the diaphragm moves towards the inlet causing the imperforate means to seal against the valve seat and stop the flow of the primary solution.

REFERENCES:
patent: 1564061 (1925-12-01), Hale
patent: 1897572 (1933-02-01), Cornell
patent: 2462189 (1949-02-01), Hess
patent: 2497906 (1950-02-01), Peters et al.
patent: 2674262 (1954-04-01), Bradshaw
patent: 3179122 (1965-04-01), Wasdell
Pneumatic Diode; IBM Technical Disclosure Bulletin, vol. 5, No. 11, Apr. 1963.

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