Passively activated valve for carrier purging

Details Passively activated valve for carrier purging Passively activated valve for carrier purging

1998-12-02

2000-05-02

Douglas, Steven O.

Fluent material handling, with receiver or receiver coacting mea

Combined

414217, B65B 104

Patent

active

060560266

ABSTRACT:
A valve seated within a SMIF pod support platform is disclosed for activating and deactivating the flow of gas to a pod on the platform. In preferred embodiments, the valve includes a central poppet capable of moving between a first, closed position where the poppet blocks the flow of gas through the valve, and a second, open position where the poppet allows gas flow through the valve. In the absence of a pod on the support platform, pressurized gas from the gas source downstream of the valve biases the poppet into the first position to thereby block gas flow. In this first position, a top portion of the poppet extends slightly above the upper surface of the pod support platform. When a pod is seated on the support platform, the weight of the pod moves the poppet from its first position to its second position where gas is allowed to flow through the valve and into the pod to allow purging of the pod.

REFERENCES:
patent: 5810062 (1998-09-01), Bonora et al.
patent: 5879458 (1999-03-01), Roberson, Jr. et al.
patent: 5988233 (1999-11-01), Fosnight et al.

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