| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Feed-control valve | Mining | A small valve, usually a needle valve, on the outlet of the hydraulic-feed cylinder on the swivel head of a diamond drill; used to control minutely the speed of the hydraulic piston travel and, hence, the rate at which the bit penetrates the rock being drilled. Also called drip valve; needle valve. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
