application_number US 201313804000 A description as shown in fig1 an implantable penile prosthesis ipp 2 according to an embodiment of the present invention comprises at least one inflatable cylinder 4 a reservoir 6 a pump 8 and a valve assembly 10 the pump 8 can further comprise a pump bulb 12 that can be compressed and released to draw and pump working fluid the ipp 2 generally operates by actuating the pump bulb 12 to draw a quantity of working fluid from the reservoir 6 and pumping the working fluid into the inflatable cylinder 4 the valve assembly 10 is generally adapted to prevent back flow of the working fluid during operation of the pump 8 to inflate inflatable cylinder 4 as shown in fig1 2 the valve assembly 10 defines a valve flow path 14 and comprises a suction poppet 16 and a cylinder poppet 18 the valve flow path 14 is defined between a reservoir inlet 20 from the reservoir 6 and a cylinder outlet 22 leading to the cylinder 4 the valve flow path 14 also further comprises a linear valve chamber 24 extending along a central valve chamber axis a a the linear valve chamber 24 defines a pump bulb opening 26 providing fluid communication between the pump bulb 12 and the linear valve chamber 24 the linear valve chamber 24 also defines a suction annulus 28 and an annular ring 30 positioned between the reservoir inlet 20 and the pump bulb opening 26 similarly the linear valve chamber 24 also.