Device for supplying an apportioned minimum amount of fluid

A device for supplying an apportioned minimum amount of fluid, especially oil for lubricating pneumatically actuated systems, comprising:

• a tappetlike positive-displacement member;
• a positive-displacement chamber defining therein an axial stop for said tappetlike positive-displacement member displaceable therein;
• a feeding channel for the discharge of liquid to be apportioned into said positive-displacement chamber;
• a check valve for the hydraulic disconnection of a portion of the positive-displacement chamber from said feeding channel;
• a drip opening;
• a discharge channel leading away from said positive-displacement chamber and discharging into said drip opening;
• a valve for sealingly closing off said discharge channel from said positive-displacement chamber;
• and
• means for prestressing said valve in a closing direction, counter to the pump direction, wherein
• said positive-displacement member being moveable in said positive-displacement chamber by a pulse controlled actuating device, as a result of which fluid to be apportioned is pumped from said feeding channel to said discharge channel,
• said valve has a valve body embodied as a structural component separated from said positive-displacement member, is subject to spring tension, and is lifted from its valve seat without contact with said positive-displacement member as it moves into said positive-displacement chamber, so that during this movement a fluid flow volume equivalent to the positively displaced volume is pumped past said valve body into said discharge channel, and once a terminal position of said positive-displacement member is reached said valve body is pressed against its valve seat;
• and
• said positive-displacement member is pressed sealingly against said axial stop in its terminal position.