Vacuum pump

A vacuum pump comprising:

• a motor;
• a pump coupled to the motor to receive torque therefrom;
• a trestle positioned between the motor and the pump, the trestle including an inlet port, an outlet port, and a fluid pathway therebetween, the outlet port being fluidly connected to the pump and positioned between the inlet port and an inlet of the pump;
• a first valve positioned within the fluid pathway and including a manifold sealed with the inlet port and positioned in the fluid pathway, an inlet seat, an outlet seat downstream of the inlet seat, a first ball, and a shaft coupled to the first ball, wherein the first ball is positioned between an inlet seat and an outlet seat, and wherein the inlet seat and the outlet seat are positioned in the fluid pathway;
• a spring disposed between the manifold and the inlet seat, wherein the spring biases the inlet seat away from the manifold;
• and
• a second valve positioned within the fluid pathway in series with and downstream from the first valve in a direction of an airflow induced by the pump, the second valve including a second ball movable within in the fluid pathway relative to the first ball of the first valve,
• wherein rotation of the shaft rotates the first ball to adjust the first valve between an open state, in which an airflow induced by the pump is drawn through the inlet port, and a closed state, in which a reverse airflow through the inlet port is prevented when the motor is deactivated,
• wherein in a closed state the second ball abuts an internal seat of the second valve, and in an open state the second ball is spaced from the internal seat,
• wherein the internal seat is threadably coupled to the trestle,
• wherein the internal seat of the second valve is abuts and supports the outlet seat, and
• wherein a seal is positioned between the internal seat of the second valve and the outlet seat of the first valve, the seal being positioned outwardly of abutting surfaces of the internal seat and the outlet seat.

A vacuum pump comprising:

• a motor;
• a pump coupled to the motor to receive torque therefrom;
• a trestle positioned between the motor and the pump, the trestle including an inlet port, an outlet port, and a fluid pathway therebetween, the outlet port being fluidly connected to the pump and positioned between the inlet port and an inlet of the pump;
• a first valve positioned within the fluid pathway and adjustable between an open state, in which an airflow induced by the pump is drawn through the inlet port, and a closed state, in which a reverse airflow through the inlet port is prevented;
• and
• a second valve positioned within the fluid pathway in series with and downstream from the first valve in a direction of the airflow induced by the pump, the second valve including a ball moveable along a plurality of ribs formed in the fluid pathway to adjust the second valve between an open state, in which an airflow induced by the pump is drawn through the inlet port, and a closed state, in which a reverse airflow through the inlet port is prevented when the motor is deactivated,
• wherein the first valve is adjustable between the closed state and the open state when the second valve is in either the open state or the closed state,
• wherein the second valve is adjacent to the first valve,
• wherein in the closed state the ball abuts an internal seat of the second valve, and in the open state the ball is spaced from the internal seat and is supported by the plurality of ribs,
• wherein the internal seat is threadably coupled to the trestle,
• wherein the internal seat of the second valve abuts and supports an outlet seat of the first valve, and
• wherein a seal is positioned between the internal seat of the second valve and the outlet seat of the first valve, the seal being positioned outwardly of abutting surfaces of the internal seat and the outlet seat.