Patent ID: 8121736
Filing Date: 2012-02-21
Classification: B23B

Abstract:
1. An apparatus comprising: an air motor having an inlet and an exhaust; a valve comprising a body with a first port, a second port, and a third port, wherein the first port is connected to the air motor, the second port is configured for connection to an air supply, and the third port is configured to vent air out of the body; a controller configured to control a first flow of the air in the body between the first port and the second port and a second flow of the air out of the body through the third port; a first valve member configured to control the first flow of the air through the second port into the body; and a second valve member configured to control the second flow of the air out of the body through the third port; wherein the first port is connected to the inlet of the air motor, wherein the controller moves the first valve member to increase the first flow of the air into the second port though the body to the first port in response to a speed of an operation being below a desired level, and wherein the controller moves the first valve member to decrease the first flow of the air into the second port though the body to the first port and moves the second valve member to increase the second flow of the air out of the body through the third port in response to the speed of the operation being above the desired level.