A pressure releasing valve structure 36″ is provided for a fluid operated device 10. The device has an orifice 42 constructed and arranged to be in fluid communication with a pressure chamber C. The valve structure includes a body 49 having first and second ends. A valve member 40 is provided at the...http://www.google.com/patents/US6957603?utm_source=gb-gplus-sharePatent US6957603 - Modulated overpressure valve structure for fluid operated device
