Valve for use in a nut installation tool

Details Valve for use in a nut installation tool Valve for use in a nut installation tool

1976-03-08

1977-05-24

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

91 31, 1376372, 173169, F16K 1114

Patent

active

040248925

ABSTRACT:
A co-axial, dual trigger valve mechanism for use in a nut runner, said valve mechanism being of such a construction as to permit low air flow initially so as to deliver only minimum acceptable torque to the nut with the result that the tool is caused to stall out at this low flow in cases where the nut has been properly pre-crimped and then upon further depression of the trigger full air flow will result causing the nut to be fully and properly installed. Conversely, if the nut has not been properly pre-crimped, the initial depression at the low pressure will cause the nut to be fully run all the way down thus indicating to the operator that the nut is improper and must be removed and replaced.

REFERENCES:
patent: 2710019 (1955-06-01), Reasoner
patent: 2995114 (1961-08-01), Starr
patent: 3326240 (1967-06-01), McConnaughy
patent: 3709259 (1973-09-01), Hechler

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