Patent ID: 8381758

Claim:
A safety relief fill valve assembly adapted to being an interface for filling and relieving excess pressure from a closed fluid system, said safety relief fill valve assembly comprising: a piston member; an insert shell having a first end, a second end, an inlet bore extending therebetween, an upper segment adjacent said second end, a lower segment adjacent said first end, a middle segment disposed between said upper and lower segments, and a detent shoulder disposed between said lower segment and said middle segment, said inlet bore adapted to retain said piston member therewithin for movement between fluid input and fluid holding configurations, said piston member adapted to seal said inlet bore when in said fluid holding configuration, and to allow fluid flow through said inlet bore when in said fluid input configuration, said piston member being resiliently biased toward said fluid holding configuration, said resilient bias adapted to being overcome responsive to a predetermined level of mechanical force applied to said piston member; a housing having a proximal end, a distal end, a main bore extending therebetween and at least a relief port, said main bore adapted to receive said insert shell therewithin such that said upper segment is sealingly received within said main bore; and an overpressure relief system adapted to having fluid retaining and fluid relief configurations, said proximal end adapted to being in fluid communication with said relief port when said overpressure relief system is in said fluid relief configuration, said overpressure relief system being elastically biased toward said fluid retaining configuration, said elastic bias adapted to being overcome responsive to said excess pressure, said overpressure relief system including a relief seal member actuatably received between said insert shell and said housing, said relief seal member being capable of establishing a fluid seal between said housing and said insert shell when said overpressure relief system is in said fluid retaining configuration, said elastic bias being provided by a main spring, said main spring being adapted to being actuatably received within said main bore and generally around said insert shell, said detent shoulder being adapted to limit movement of said relief seal member toward said second end.