Automatic inlet check valve release

Details Automatic inlet check valve release Automatic inlet check valve release

2005-07-29

2009-06-02

Kramer, Devon C (Department: 3746)

Pumps

With condition responsive pumped fluid control

Having timer or delay means for fluid controller

C417S298000, C417S440000

Reexamination Certificate

active

07540721

ABSTRACT:
Apparatus and method for releasing a stuck inlet check valve of a paint pump including a solenoid connected to the check valve with a pusher element which momentarily displaces a moveable element such as a ball in the check valve to break any adhesion between the movable element and a valve seat. A control provides a single pulse of energy to the solenoid each time power is applied to the pump. The control includes an SCR connected between a full wave rectifier and a coil of the solenoid, with gate current removed from the SCR to commutate the SCR after a predetermined time interval after power is applied.

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International Search Report and Written Opinion of International Application No. PCT/US2006/029737, filed Jul. 26, 2006; both mailed Dec. 7, 2006.

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