Sequence valve and a downhole tractor

Details Sequence valve and a downhole tractor Sequence valve and a downhole tractor

2011-05-24

2011-05-24

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

With self-acting cyclic advance and retraction of tool or...

C137S491000, C060S426000

Reexamination Certificate

active

07946358

ABSTRACT:
The invention relates to a sequence valve for use in a hydraulic plant, which sequence valve has a pressure-controlled slide valve (5) with a spring return and in a starting position defines a first cavity (10), which cavity is connected with a tank and the hydraulic plant, and in a second, pressurized position closes off the connection with the tank. The cavity is connected to a second cavity (18) via a channel (15, 16, 17) in the slide valve, and the second cavity is adapted to be connected with a pump via a throttle (20) and is positioned on the same side of the slide valve as the spring (7). The sequence valve has a third cavity (19), which is adapted to be connected with the pump and is positioned on the opposite side of the slide valve from the spring, and the second and the third cavity are connected with each other via a fixed throttle with a short flow channel. The invention also relates to downhole tractor with the sequence valve.

REFERENCES:
patent: 2598233 (1952-05-01), Deardorff
patent: 3421532 (1969-01-01), Davidson
patent: 3543516 (1970-12-01), Treichel
patent: 4300584 (1981-11-01), Kosarzecki
patent: 5996615 (1999-12-01), Zuegner et al.
patent: 6293765 (2001-09-01), Peterson
patent: 7766041 (2010-08-01), Tackes et al.
patent: WO 82/01042 (1982-04-01), None
patent: WO 2004/072433 (2004-08-01), None
International Search Report for PCT/DK2009/050011, mailed Mar. 19, 2009.
Written Opinion of the International Searching Authority for PCT/DK2009/050011, mailed Mar. 19, 2009.

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