Pressure Relief Tool and Method for Closed System
AssigneeCaterpillar Inc.
InventorJack Albert Merchant
Life of this patent
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Abstract
Systems, methods and tools are disclosed for releasing pressure from closed systems. For example, in a SCR system, diesel emission fluid (DEF) can become over pressurized as it is pumped between a DEF pump and a DEF injector. A manifold may be disposed between the pump and injector. The manifold or passageway that communicates the DEF between the pump and injector includes a service port. A plug is disposed between the DEF passage and the service port or on a seat disposed between the DEF passage and the service port. A specially designed tool is employed to dislodge the plug from the seat and release pressure in the DEF passage through the tool and, optionally, through a drain hose connected to a distal end of the tool.
Claims20
A diesel emission fluid (DEF) injector pressure relief system comprising:
- a DEF passage which communicates DEF to a DEF injector, the DEF passage in communication with a seat disposed between the DEF passage and a service port;
- a plug disposed on the seat between the DEF passage and the service port.
A method for relieving pressure from a diesel exhaust fluid (DEF) system, the method comprising:
- providing a service port in communication with a seat;
- providing a DEF passage in communication with the seat, the DEF passage providing pressurized DEF to a DEF injector;
- seating a plug on the seat to isolate the service port from the DEF passage;
- displacing the plug using a service tool inserted into the service port;
- and
- releasing pressure from the DEF passage through the displacement of the plug.
A service tool comprising:
- a body comprising a proximal end and a distal end;
- the proximal end including a first opening;
- the distal end including a second opening;
- a hollow passageway extending through the body between the first and second openings;
- wherein the proximal end is configured for insertion into a service port of a diesel exhaust fluid (DEF) manifold, and
- wherein the proximal end is configured to displace a plug within the DEF manifold, and wherein the hollow passageway is configured to allow passage of DEF through the service tool.
Dependencies are inferred from the claim text.