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An automatic shut-off device, comprising a housing member with a hollow opening, an inlet port coupled to a first end of the housing member, an outlet port coupled to a second end of the housing member, a valve coupled to the outlet port, a variable volume chamber within the housing member with an o

An automatic shut-off device, comprising a housing member with a hollow opening, an inlet port coupled to a first end of the housing member, an outlet port coupled to a second end of the housing member, a valve coupled to the outlet port, a variable volume chamber within the housing member with an open end facing the inlet port of the housing member and a closed end with flow restriction holes in closed end facing the outlet port of the housing member, a one-way valve disposed in the closed end of the variable volume chamber, and a spring-biased piston within the variable volume chamber with a compressible spring coupled to the piston at the closed end of the chamber wherein the piston is mechanically coupled to the valve.

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1. An automatic shut-off device comprising: a housing member with a hollow opening;an inlet port coupled to a first end of the housing member;an outlet port coupled to a second end of the housing member;a variable volume chamber within the housing member with an open end facing the inlet port of the

1. An automatic shut-off device comprising: a housing member with a hollow opening;an inlet port coupled to a first end of the housing member;an outlet port coupled to a second end of the housing member;a variable volume chamber within the housing member with an open end facing the inlet port of the housing member and a closed end facing the outlet port of the housing member;wherein: the closed end comprises at least one flow restriction hole;a spring-biased piston movable within the variable volume chamber and comprising a compressible spring and a piston;wherein: the piston extends through the closed end of the variable volume chamber into the outlet port,the piston is movable between a resting position that allows fluid through the outlet port and a blocking position that blocks fluid from leaving the outlet port, the piston is held in the resting position by the pressure of the fluid in the closed end of the variable volume chamber,the piston is configured to move to the blocking position when substantially constant fluid flow through the device causes the pressure of the fluid in the open end of the variable volume chamber to be substantially greater than the pressure of the fluid in the closed end of the variable volume chamber for a predetermined period of time,the piston is configured to move to the resting position when a change in fluid flow rate causes additional fluid to flow through the flow restriction holes and into the variable volume chamber, wherein the change in fluid flow rate causes the resulting pressure to push against the backside of the piston; anda fluid passage within the housing member and separate from the variable volume chamber, wherein fluid flows from the inlet port both into the open end of the variable volume chamber against the piston and into the fluid passage toward the outlet port. 2. The automatic shut-off device of claim 1 and further comprising a pressure release screw in the outlet port, the pressure release screw being configured to disengage the piston from the blocking position back toward the resting position. 3. The automatic shut-off device of claim 1, wherein the flow restriction hole includes a plurality of flow restriction holes, and further comprising a rod configured to selectively block each of the plurality of flow restriction holes and adjust the predetermined period of time. 4. The automatic shut-off device of claim 1, further comprising a one-way valve disposed in the closed end of the variable volume chamber, wherein the one-way valve permits fluid into the variable volume chamber from the closed end and blocks fluid from leaving the closed end of the variable volume chamber through the one-way valve. 5. The automatic shut-off device of claim 1, further comprising a stopper coupled to an end of the piston, the stopper configured to block fluid from leaving outlet port when the piston is in the blocking position. 6. The automatic shut-off device of claim 1, further comprising a filter disposed within the variable volume chamber. 7. The automatic shut-off device of claim 1, further comprising at least one sealing ring disposed within the housing member. 8. The automatic shut-off device of claim 1, wherein the second end of the housing member includes a chamber disk, the chamber disk forming the closed end of the variable volume chamber. 9. The automatic shut-off device of claim 1, wherein the compressible spring is configured to return the piston to the resting state when the fluid pressure in the inlet port is substantially equal to the fluid pressure in the outlet port. 10. An automatic shut-off device comprising: a housing member having a variable volume chamber and a fluid passage separate from the variable volume chamber, the variable volume chamber including an open end and an opposite closed end with a flow restriction hole;an inlet port coupled to a first end of the housing member upstream from the open end and the fluid passage;an outlet port coupled to a second end of the housing member downstream from the closed end and the fluid passage,wherein fluid flow entering the inlet port flows into the open end and the fluid passage, and fluid flow through the fluid passage enters the outlet port; anda spring-biased piston within the variable volume chamber comprising a compressible spring and a piston extending through the closed end, wherein fluid flow into the open end presses against a front side of the piston, and fluid flow into the outlet port backflows through the flow restriction hole and presses against a back side of the piston. 11. The automatic shut-off device of claim 10, wherein the piston is movable between a resting state that allows fluid through the outlet port and a blocking state that blocks fluid from leaving the outlet port. 12. The automatic shut-off device of claim 11, wherein the piston is moved to the blocking state after a predetermined period of time of substantially constant flow through the device. 13. The automatic shut-off device of claim 12, wherein the flow restriction hole includes a plurality of flow restriction holes, and further comprising a rod configured to selectively block each of the plurality of flow restriction holes and adjust the predetermined period of time. 14. The automatic shut-off device of claim 11 and further comprising a stopper coupled to the piston and positioned within the outlet port, wherein the piston forces the stopper to block fluid from exiting the outlet port in the blocking state. 15. The automatic shut-off device of claim 14, and further comprising a pressure release screw configured to selectively move between preventing the stopper from blocking fluid flow exiting the outlet port and permitting the stopper to block fluid flow exiting the outlet port. 16. The automatic shut-off device of claim 10, wherein the compressible spring is positioned within the variable volume chamber to press against the back side of the piston.