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A pressure supply device in accordance to one or more aspects includes an elongated body having an internal bore extending from a power end to a discharge end having a discharge port, two or more gas generators connected to the power end and a hydraulic fluid disposed in the bore between a piston an

A pressure supply device in accordance to one or more aspects includes an elongated body having an internal bore extending from a power end to a discharge end having a discharge port, two or more gas generators connected to the power end and a hydraulic fluid disposed in the bore between a piston and the discharge end. The ignition of one of the gas generators drives the piston to exhaust a partial volume of the hydraulic fluid that is less than the total operational volume of the hydraulic fluid under pressure to operate at a connected device.

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1. A method of actuating a hydraulically operated device, comprising: exhausting, in response to a demand to actuate the hydraulically operated device, a first volume of pressurized hydraulic fluid through a discharge port of a pressure supply device in response to igniting a first gas generator of

1. A method of actuating a hydraulically operated device, comprising: exhausting, in response to a demand to actuate the hydraulically operated device, a first volume of pressurized hydraulic fluid through a discharge port of a pressure supply device in response to igniting a first gas generator of two or more gas generators, wherein the pressure supply device comprises: an elongated body having an internal bore extending from a power end to a discharge end having the discharge port, the two or more gas generators connected to the power end, and hydraulic fluid disposed in the internal bore between a piston and the discharge end;exhausting, in response to a demand to actuate the hydraulically operated device, a second volume of pressurized hydraulic fluid through the discharge port in response to igniting a second gas generator of the two or more gas generators;actuating the hydraulically operated device to a first position in response to receiving the first volume of pressurized hydraulic fluid; andactuating the hydraulically operated device to a second position in response to receiving the second volume of pressurized hydraulic fluid. 2. The method of claim 1, wherein the first and the second gas generators comprise a propellant that produces a gas in response to being ignited. 3. The method of claim 1, wherein the first and second gas generators are connected directly to the power end. 4. The method of claim 1, wherein the first and the second gas generators are connected to the power end through a conduit. 5. The method of claim 1, wherein: the first and the second gas generators comprise a propellant that produces a gas in response to being ignited; andthe first and second gas generators are connected directly to the power end. 6. The method of claim 1, wherein: the first and the second gas generators comprise a propellant that produces a gas in response to being ignited; andthe first and the second gas generators are connected to the power end through a conduit. 7. The method of claim 1, wherein the hydraulically operated device is a valve. 8. The method of claim 1, wherein the hydraulically operated device is connected in a well system. 9. The method of claim 1, comprising a one-way valve connected between the discharge port and the hydraulically operated device. 10. The method of claim 1, wherein the piston separates a hydraulic chamber formed between the piston and the discharge end and a gas expansion chamber on an opposite side of the piston, the hydraulic fluid disposed in the hydraulic chamber. 11. The method of claim 1, wherein the hydraulically operated device is located subsea. 12. The method of claim 1, wherein the hydraulically operated device is a ram. 13. The method of claim 1, comprising a one-way valve connected between the discharge port and the hydraulically operated device; and the piston separating a hydraulic chamber formed between the piston and the discharge end and a gas expansion chamber formed between the piston and the power end, the hydraulic fluid disposed in the hydraulic chamber. 14. The method of claim 1, wherein the exhausting the first volume of pressurized hydraulic fluid comprises driving the piston toward the discharge end in response to a gas produced by the igniting the first gas generator; and the exhausting the second volume of pressurized hydraulic fluid comprises driving the piston toward the discharge end in response to a gas produced by the igniting the second gas generator. 15. The method of claim 14, wherein the hydraulically operated device is connected in a well system. 16. The method of claim 1, wherein the piston separates a hydraulic chamber formed between the piston and the discharge end and a gas expansion chamber formed between the piston and the power end, the hydraulic fluid disposed in the hydraulic chamber; the exhausting the first volume of pressurized hydraulic fluid comprises driving the piston toward the discharge end in response to a gas produced by the igniting the first gas generator being communicated into the gas expansion chamber; andthe exhausting the second volume of pressurized hydraulic fluid comprises driving the piston toward the discharge end in response to a gas produced by the igniting the second gas generator being communicated into the gas expansion chamber. 17. The method of claim 16, wherein the hydraulically operated device is connected in a well system. 18. The method of claim 16, wherein the hydraulically operated device is a ram. 19. The method of claim 1, comprising a one-way valve connected between the discharge port and the hydraulically operated device; the piston separating a hydraulic chamber formed between the piston and the discharge end and a gas expansion chamber formed between the piston and the power end, the hydraulic fluid disposed in the hydraulic chamber;the exhausting the first volume of pressurized hydraulic fluid comprises driving the piston toward the discharge end in response to a gas produced by the igniting the first gas generator being communicated into the gas expansion chamber; andthe exhausting the second volume of pressurized hydraulic fluid comprises driving the piston toward the discharge end in response to a gas produced by the igniting the second gas generator being communicated into the gas expansion chamber. 20. The method of claim 19, wherein the hydraulically operated device is connected in a well system.