Valve devices

Details Valve devices Valve devices

1984-12-17

1986-04-08

Scott, Samuel

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137489, 91170MP, 405302, F16K 31363, F16K 1736

Patent

active

045805946

ABSTRACT:
A valve device is provided for use in a pressurized hydraulic fluid path, for example the hydraulic path of a hydraulic leg of a mine roof support which is required to yield under two different sets of conditions. The valve device has a port 15 for connection to the pressurized hydraulic fluid path, a bleed valve 25 being arranged to permit hydraulic fluid to bleed from the path at a first rate when the pressure in the path exceeds the first limit, for example to permit the hydraulic leg to collapse at a very slow rate, for example as a mine roof converges. There is also a dump valve 20 arranged to permit hydraulic fluid to flow from the path at a second greater rate, for example if a rock burst occurs. Although the dump valve 20 reacts to high pressure surges of fluid, it does not react to low pressure surges because a non-return valve device 30 traps on one side of the dump valve hydraulic fluid which is at a pressure in the region of the first limit. Thus the dump valve only operates if the pressure on the other side of the dump valve exceeds the first limit.

REFERENCES:
patent: 2351873 (1944-06-01), Parker
patent: 3987814 (1976-10-01), Hall

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