| 摘要 |
<p>A metering valve, of the type suitable for connection to a lubrication line, to deliver predefined quantities of lubricant when the lubricant in said line is brought to a determined pressure, comprising: an entry channel (1A) connected to said line, a metering chamber (9) containing said predefined quantity of lubricant and connected at its inlet to said channel (1A) and at its outlet to an exit hole (17A), a piston (6) arranged to move, against an elastic element (7), towards said exit hole (17A) to discharge said predefined quantity of lubricant when the lubricant in said line reaches said predetermined pressure, and to return to a rest position by the action of said elastic element (7) when the pressure in said line falls below said predetermined pressure. To the piston (6) there are connected valve means (14) arranged to enable lubricant to pass from said entry channel (1A) to said chamber (9) only when the lubricant pressure within the line is less than said predetermined pressure. <IMAGE></p> |
