Abstract: A metering pump includes an apparatus for adjusting the stroke length of a pump element. The apparatus comprises a lever having a cam which is contacted by the pump element.

Abstract: A control for a pump detects an operational characteristic thereof and applies power to a power unit in dependence upon the detected operational characteristic to automatically and electronically control pump priming and stroke length.

Abstract: A control for a pump detects an operational characteristic thereof and controls movement of a pump element based on the detected operational characteristic.

Abstract: A valve includes a valve body including a recess therein, a valve element movably disposed in the recess and a seal member disposed in the recess. The seal member has first, second and third separate and distinct sealing surfaces which are engageable by the valve element in response to fluid pressure in the recess.

Abstract: A movable magnet is captured in and biased toward one end of a passage. A pulse of flow moves this magnet and this movement is sensed by a sensor which sends a signal. A range adjusting channel with a valve therein permits adjustment of the flow which actuates the sensor.

Abstract: A ball check valve assembly for chemical pumps. A fluid conduit terminates at a first surface in a port of circular cross section. Within the conduit, an O ring seat is aligned with the port; an elastomeric O ring is positioned in the seat. Spacer means, radially outward of the O ring seat, extends generally away from the port and has a dimension adjacent the O ring seat greater than the cross sectional diameter of the O ring when unstressed. O ring capture means spaced from the O ring seat limits travel of the O ring away from the port, and provides a central aperture for the valve ball, which has a diameter greater than that of the port. The O ring has an ID less than the diameter of the ball and an OD greater than the diameter of the aperture; the spacer means ID is at least about 1/2% greater than the OD of the O ring.

Abstract: A ball check valve is described having a fluid port, a ball moveable toward and away from the port, a seating surface surrounding the port and an elastomeric sealing element. The seating surface has a conical annular surface extending radially outwardly away from the ball and an annular ridge between the port and the conical surface. The sealing element has an outer sealing surface for contacting the conical seating surface and an annular groove for receiving the seating surface ridge. On its ball side, it has an annular outer surface and an inner sealing surface for contacting the ball. A sealing element retainer contacts the outer portion of the elastomeric sealing element outer surface on its ball side to hold it in position.