Throttle valve device for a pneumatic power tool

Details Throttle valve device for a pneumatic power tool Throttle valve device for a pneumatic power tool

2006-05-23

2006-05-23

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

C137S599010, C173S169000

Reexamination Certificate

active

07048005

ABSTRACT:
A throttle valve device for a pneumatic power tool comprises a casing (10) with an air inlet passage (11), an air outlet passage (12), a valve chamber (13) with a main valve seat (14) and a main valve element (15), and a manually shiftable activating rod (21) which is sealingly guided in a lateral guide way (19) and arranged to engage and displace the main valve element (15) off the main seat (14), wherein the activating rod (21) has a valve portion (27,28) for co-operation with a secondary valve seat (24) in the guide way (19) for controlling a bypass passage (23,24,29) extending between the inlet passage (11) and the outlet passage (12) such that the activation rod valve portion (27,28) is separated from the secondary valve seat (24) and opens up the bypass passage (23,24,29) before the activation rod (21) engages and displaces the main valve element (15) off the main seat (14) when operating the activation rod (21) in the opening direction.

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