초록 ▼

An air driven diaphragm pump having two, opposed pumping cavities. A center section assembly between the pumping cavities includes a cylinder and a power amplifier piston. The power amplifier piston as well as the diaphragms are coupled with a common control shaft. A valve assembly is arranged with

An air driven diaphragm pump having two, opposed pumping cavities. A center section assembly between the pumping cavities includes a cylinder and a power amplifier piston. The power amplifier piston as well as the diaphragms are coupled with a common control shaft. A valve assembly is arranged with a manifold to receive pressurized air and distribute that air in alternating fashion to the sides of the power amplifier piston as well as to each of the diaphragms. By directing pressure to a side of the power amplifier piston facing the same direction as the diaphragm receiving pressure, an amplified pressure on a pump chamber is experienced. With the power amplifier piston being approximately twice as large as the diaphragm assembly, an amplification of three times the pressure on the pump chamber is experienced. Both pump chambers are able to operate to pump material. A relief valve includes an actuator and a valve element which cooperate through a compression spring and stops to provide a force profile for valve actuation and energy for positive actuation. Both the compression spring and a return spring are configured for longevity through a great number of cycles. Blocks of elastomeric material are disclosed.

대표청구항 ▼

1. A relief valve comprisinga valve body including a cavity therein, a guideway extending to the cavity, a valve seat in the cavity and a flow path through the cavity and across the valve seat to exhaust; an actuator slidably positioned in the guideway; a valve element slidably positioned in the val

1. A relief valve comprisinga valve body including a cavity therein, a guideway extending to the cavity, a valve seat in the cavity and a flow path through the cavity and across the valve seat to exhaust; an actuator slidably positioned in the guideway; a valve element slidably positioned in the valve body within the cavity, facing the guideway and slidable into and biased toward seating engagement with the valve seat; a compression spring between the actuator and the valve element; a return spring between the valve body and the valve element to bias the valve element toward seating engagement with the valve seat, the return spring including a central body with legs radiating outwardly and curved axially therefrom to form a dome shape.