Image forming devices and valves that may be used in image forming devices

1. An image forming device, comprising:

an ink supply line;

an ink deposition device including a pressure regulator; and

an active valve including

a housing having an inlet operably connected to the ink supply line and an outlet operably connected to the ink deposition devices,

a valve member movable between a closed position that prevents flow between the inlet and the outlet and an open position that allows flow between the inlet and the outlet, and

first and second diaphragms defining a fluid cavity therebetween that extends from the first diaphragm to the second diaphragm, at least the first diaphragm being operably connected to the valve member such that movement of the first diaphragm results in movement of the valve member.

2. An image forming device as claimed in claim 1 , further comprising:

an ink supply operably connected to the ink supply line.

3. An image forming device as claimed in claim 2 , wherein the ink supply comprises a pressurized ink supply.

4. An image forming device as claimed in claim 1 , wherein the ink deposition device comprises at least one ink-jet pen.

5. An image forming device as claimed in claim 1 , wherein the pressure regulator comprises a passive valve.

6. An image forming device as claimed in claim 1 , wherein the valve member is biased to the closed position.

7. An image forming device as claimed in claim 6 , further comprising:

a device controller that causes the valve member to be in the open position when the ink deposition device is depositing ink and allows the valve member to be in the closed position when the ink deposition device is not depositing ink.

8. An image forming device as claimed in claim 6 , further comprising:

a source of pressurized fluid operably connected to the fluid cavity;

wherein the valve member is configured to move to the open position in response to the receipt of pressurized fluid.

9. An image forming device as claimed in claim 8 , wherein the ink supply is operably connected to the source of pressurized fluid.

10. An image forming device as claimed in claim 1 , wherein the ink supply line includes a first portion connected to the housing inlet and a second portion extending from the housing outlet to the ink deposition device.

11. An image forming device as claimed in claim 1 , wherein the housing includes a connector region that connects the inlet to the outlet and the second diaphragm separates the connector region from the fluid cavity.

12. An image forming device as claimed in claim 11 , wherein the connector region includes a valve seat and the second diaphragm engages the valve seat when the valve member is in the closed position.

13. An image forming device as claimed in claim 1 , further comprising:

a biasing member that biases the valve member to the closed position.

14. An image forming device as claimed in claim 1 , wherein the first and second diaphragms define respective surface areas within the fluid cavity and the surface area of the first diaphragm is greater than the surface area of the second diaphragm.

15. A method of operating an image forming device, comprising the steps of:

supplying ink from an ink supply to an ink deposition device;

regulating pressure within the ink deposition device with a pressure regulator associated with the ink deposition device;

opening a valve, located between the ink supply and the ink deposition device, by supplying pressurized fluid to a fluid cavity that extends from a first diaphragm to a second diaphragm when the ink deposition device is depositing ink; and

closing the valve when the ink deposition device in not depositing ink.

16. A method as claimed in claim 15 , wherein the step of supplying ink from an ink supply comprises supplying ink from a pressurized ink supply to an ink deposition device.

17. A method as claimed in claim 15 , wherein the step of regulating pressure within the ink deposition device comprises regulating pressure within the ink deposition device with a passive valve associated with the ink deposition device.

18. A method as claimed in claim 15 , wherein the step of closing the valve comprises not supplying pressurized fluid to the the fluid cavity that extends from a first diaphragm to a second diaphragm when the ink deposition device is not depositing ink.