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1. (WO2018106520) DEHIDER REGULATOR VALVE
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A handheld dehider comprising:

a housing;

a pneumatic motor having an air inlet in the housing for providing a flow of pressurized air to the motor;

a pair of cutting disks mounted in the housing, the cutting disks driven by the pneumatic motor;

a speed governor in the housing between the air inlet and the motor, the speed governor controlling the flow of pressurized air from the air inlet to the motor; and

an air pressure regulator disposed along the air inlet, the regulator having a valve to open and close flow of pressurized air in the air inlet, a first spring urging the valve in the direction of air flow through the inlet to close the valve, a plunger or other switch mechanism operable to move the valve from a closed to an open position against the direction of air flow in the air inlet, a piston connected to the valve on one side and exposed to flow of air through the air inlet, and a second spring disposed between the piston and the plunger,

whereby upon depressing the plunger or otherwise operating the switch mechanism the second spring urges the piston to open the valve against the air flow direction to permit pressurized air to flow through the regulator and on to the speed governor and the motor, and

wherein maximum pressure of the air through the regulator and subsequently through the speed governor is determined by spring forces of the first and second springs and resistance of the piston to flow of air through the valve.

2. The dehider of claim 1 wherein during operation of the air pressure regulator to limit maximum pressure of the air through the speed governor, the sum of spring force of the first spring and force exerted on the piston by flow of air through the valve is continuously offset by force of the second spring to maintain the degree of opening of the valve.

3. The dehider of claim 2 wherein balancing of the first spring and piston air resistance forces against the second spring force causes air pressure regulation through the speed governor within a predetermined pressure range.

4. The dehider of claim 3 further including one or more shims adjacent one or both of the first and second springs, the thickness of the shim(s) providing adjustment of the spring forces of the first and second springs.

5. The dehider of claim 3 further including a guide adjacent the plunger, the dimension of the guide determining the maximum degree of movement of the plunger to open the valve and regulating the maximum volume of air flow through the valve.

6. The dehider of claim 1 wherein the housing is elongated and the speed governor rotates about a longitudinal axis within the housing, and wherein the plunger and valve move between closed and open positions along an axis normal to the housing longitudinal axis.

7. The dehider of claim 1 further including a lever on the housing for depressing the plunger.

8. A method of regulating air pressure to a pneumatic motor comprising:

providing an air pressure regulator disposed along an air inlet to the motor, the regulator having a valve to open and close flow of pressurized air

in the air inlet, a first spring urging the valve in the direction of air flow through the inlet to close the valve, a switch operable to move the valve from a closed to an open position against the direction of air flow in the air inlet, a piston connected to the valve on one side and exposed to flow of air through the air inlet, and a second spring disposed between the piston and the plunger; and

operating the switch to cause the second spring to urge the piston to open the valve against the air flow direction to permit pressurized air to flow through the regulator and on to the speed governor and the motor,

wherein maximum pressure of the air through the regulator and subsequently through the speed governor is determined by spring forces of the first and second springs and resistance of the piston to flow. of air through the valve.

9. The method of claim 8 wherein the pneumatic motor is in a housing and the air inlet is in the housing for providing a flow of pressurized air to the motor, and there is provided a speed governor in the housing between the air inlet and the motor, and wherein the speed governor controls the flow of pressurized air from the air inlet to the motor.

10. The method of claim 9 wherein the housing is elongated and the speed governor rotates about a longitudinal axis within the housing, and wherein the plunger and valve move between closed and open positions along an axis normal to the housing longitudinal axis.

1 1 . The method of claim 9 wherein the housing is for a handheld dehider and the pneumatic motor drives a pair of cutting disks mounted in the housing.

12. The method of claim 1 1 wherein the dehider is connected to a source of pressurized air at a line pressure that may be varied, and wherein the air pressure regulator operates up to a predetermined line air pressure to reduce pressure to the speed governor sufficiently to let the governor control speed and, at or above the predetermined line pressure, the air pressure regulator shuts off flow of pressurized air to the speed governor completely until the line pressure is reduced.

1 3. The method of claim 8 further providing one or more shims adjacent one or both of the first and second springs, and wherein the thickness of the shim(s) provide adjustment of the spring forces of the first and second springs.

14. The method of claim 8 further providing a guide adjacent the plunger, the dimension of the guide determining the maximum degree of movement of the plunger to open the valve and regulating the maximum volume of air flow through the valve.

15. An air pressure regulator for an air powered tool, the regulator being disposed in a housing for the tool along an air inlet, the regulator having a valve to open and close flow of pressurized air in the air inlet, a bias spring urging the valve in the direction of air flow through the inlet to close the valve, a plunger or other switch mechanism operable to move the valve from a closed to an open position against the direction of air flow in the air inlet, a piston connected to the valve on one side and exposed to flow of air through the air inlet, and a regulator spring disposed between the piston and the plunger, whereby upon depressing the plunger or otherwise operating the switch mechanism the regulator spring urges the piston to open the valve against the air flow direction to permit pressurized air to flow through the regulator, and wherein maximum pressure of the air through the regulator is determined by spring forces of the bias and regulator springs and resistance of the piston to flow of air through the valve.

16. The air pressure regulator of claim 1 5 wherein during operation of the air pressure regulator to limit maximum pressure of air, the sum of spring force of the bias spring and force exerted on the piston by flow of air through the valve is continuously offset by force of the regulator spring to maintain the degree of opening of the valve.

1 7. The air pressure regulator of claim 1 5 wherein balancing of the bias spring and piston air resistance forces against the regulator spring force causes air pressure regulation through a speed governor within a predetermined pressure range.

18. The air pressure regulator of claim 1 7 further including one or more shims adjacent one or both of the bias and regulator springs, the thickness of the shim(s) providing adjustment of the spring forces of the bias and regulator springs.

19. The air pressure regulator of claim 15 further including a guide adjacent the plunger, the dimension of the guide determining the maximum degree of movement of the plunger to open the valve and regulating the maximum volume of air flow through the valve.

20. The air pressure regulator of claim 1 5 further including a lever on the housing adjacent the air pressure regulator for depressing the plunger.