Safety valve unit

Details Safety valve unit Safety valve unit

2007-10-23

2007-10-23

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S540000

Reexamination Certificate

active

11094243

ABSTRACT:
A safety valve unit permits its user to perform an adjustment of the valve unit in cracking pressure from the outside in an easy and an adequate manner without disassembling any part of the valve unit in a condition in which the valve unit remains inline-connected with a fluid circuit. The safety valve unit is provided with a rotary barrel member (1), in which a cracking-pressure adjusting portion (4, 5, 6, 7and8) is incorporated and driven by the barrel member (1) in order to adjust the cracking pressure. The barrel member (1) has its female screw portion (2) threadably engaged with a male screw portion of the cracking-pressure adjusting portion (4) that is a movable spring support (4). When the barrel member (1) is rotated, the spring support (4) is axially and linearly displaced to adjust the cracking pressure of the valve unit.

REFERENCES:
patent: 98697 (1870-01-01), La France
patent: 347213 (1886-08-01), Walker
patent: 1322638 (1919-11-01), Smolensky
patent: 2720890 (1955-10-01), Stroud
patent: 3255774 (1966-06-01), Gallagher et al.
patent: 3422840 (1969-01-01), Brumm et al.
patent: 4428396 (1984-01-01), Wall
patent: 4545405 (1985-10-01), LaBelle
patent: 4718442 (1988-01-01), Nicoll

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