Patent ID: 7827903

Claim:
A seal valve arrangement for a hydraulic device, the hydraulic device having surfaces defining an inner bore, seal valve arrangement comprising: an element disposed in the bore, the element being constructed and arranged to define a fluid passage so fluid can move from one side thereof to a side opposite the one side, an elastomer seal member disposed generally adjacent to the fluid passage and to a seal portion of the element, and a spring member biasing the seal member to engage the seal portion of the element to maintain sealing of the fluid passage under certain fluid pressure conditions, and under different fluid pressure conditions, to permit the seal member disengage from the seal portion of the element to open the fluid passage to permit fluid to flow there-through, wherein a tipping point is defined as a point when a fluid pressure condition alone causes the seal member to fully engage the seal portion of the element and fully seal the fluid passage, the tipping point being determined by the following relationships: (cos α/sin α)=( Fs−N*f )/ N , and R=N /sin α wherein: N—a normal force of the seal member against the inner bore f—a coefficient of friction Fs—a force of the spring member on the seal member α—an angle to the portion of the element R—a resultant of vector forces at the portion of the element.