Tamper resistant adjustment range control for the adjustment scr

Details Tamper resistant adjustment range control for the adjustment scr Tamper resistant adjustment range control for the adjustment scr

1990-03-30

1991-03-19

Walton, George L.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

29890124, 29890128, 29DIG1, 37 15, 3750542, 251284, 267177, 411 82, 411301, 411910, F16K 1700, F16K 3500

Patent

active

050002228

ABSTRACT:
A pressure adjustment screw for a fluid flow control device cannot for safety's sake be rotated within a threaded cylindrical bore on the device's body to withdraw it beyond an extreme pressure level safety setting. To allow field adjustment of the set point pressure and at the same time to prevent withdrawal of the adjustment screw beyond the extreme pressure level safety setting, a stop collar is fixed within the cylindrical bore in a position contacting the adjustment screw when the adjustment screw is in its extreme pressure level safety setting. The invention includes a number of means for fixing the stop collar in this position, as do methods for fixing the stop collar in this position.

REFERENCES:
patent: 1561367 (1925-11-01), Spreen
patent: 1877938 (1932-09-01), Moore
patent: 2558292 (1951-06-01), Faller
patent: 3159388 (1964-12-01), Wall
patent: 3419247 (1968-12-01), Bosi
patent: 3603214 (1971-09-01), Murrell
patent: 3747629 (1973-07-01), Bauman
patent: 3805863 (1974-04-01), Starr
patent: 3964948 (1976-06-01), Busse
patent: 4621658 (1986-11-01), Buezis
patent: 4915557 (1990-04-01), Stafford

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