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US 2012/0073678 A1Published application
Safety valve system for overpressure protection of hydraulic circuits
OwnerMike Winninventor
Life of this patent
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Abstract
An overpressure protection system provides for protection of a hydraulic system from elevated pressures. The system automatically stops flow to the system and prevents system pressure from exceeding a predetermined level. The system requires manual intervention to reopen flow, giving a worker the opportunity to resolve any system problems before system damage occurs.
Claims18
An overpressure protection system for a hydraulic system comprising:
- an overpressure protection valve comprising:
- a pilot operated check valve having an inlet connected to a high pressure hydraulic inlet line and an outlet connected to the hydraulic system, hydraulic fluid flowing through the check valve to operate said hydraulic system;
- a pressure sense line connected to a portion of said hydraulic system;
- a first hydraulically operated pilot valve having an inlet connected to the pressure sense line and an outlet connected to a pilot inlet on the check valve via a hydraulic passage;
- and
- a manually operated valve to relieve pressure in said hydraulic passage.
3 more elements
An overpressure protection system for a hydraulically driven device comprising:
- an overpressure protection valve having:
- a fluid inlet attached to a high pressure hydraulic source;
- a fluid outlet attached to a machine driven by said high pressure hydraulic source;
- a check valve disposed between the fluid inlet and the fluid outlet to selectively prevent and allow flow therebetween;
- a pressure sense line connected to a hydraulic circuit of said machine, the pressure sense line being connected to the check valve such that when pressure in said hydraulic circuit exceeds a predetermined threshold the check valve is closed and flow is prevented between the fluid inlet and the fluid outlet.
2 more elements
Dependencies are inferred from the claim text.