Pilot-type two-port valve

Details Pilot-type two-port valve Pilot-type two-port valve

2006-07-03

2008-10-14

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

C251S054000, C251S063000, C251S063600

Reexamination Certificate

active

07434780

ABSTRACT:
A pilot-type two-port valve is disclosed having a water hammer preventing mechanism, operative to prevent a water hammer during valve-closing operation, which includes a valve member operative to open or close a valve and a piston driven by pilot fluid for operating the valve member for opening and closing movements. The water hammer preventing mechanism comprises a piston drive chamber, from which fluid is discharged during valve-closing operation, which has an orifice for restricting the flow rate of discharge fluid whereby when the piston moves to a position to allow the valve member to be close to a valve seat, a portion of an discharge flow passage of the piston drive chamber is blocked to restrict the flow rate of the discharge fluid to the flow rate of fluid flowing through the orifice.

REFERENCES:
patent: 4526341 (1985-07-01), Thomas
patent: 6491059 (2002-12-01), Kajitani
patent: 6854705 (2005-02-01), Wieder
patent: 2001-193846 (2001-07-01), None
patent: 2004-316679 (2004-11-01), None
U.S. Appl. No. 11/446,382, filed Jun. 5, 2006, Hayashi et al.
U.S. Appl. No. 11/478,731, filed Jul. 3, 2006, Hayashi et al.

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