| 摘要 |
<p>This invention relates to controlled inlet valves for metering pumps. The metering pumps for which the valve of the invention is applicable are of the kind comprising a cylinder in which moves a piston to which a reciprocating movement is imparted. In the valve of the invention a member is mounted to slide in the pump cylinder and one of the ends of this member has an obturator which co-operates with a sealing gland arranged at the inlet opening to the cylinder. The sliding member is selectively coupled at its other end to the piston and is subject to the urging of an elastic member which is capable of thrusting the obturator back to the closed position.</p> |
