Patent ID: 8720572

Claim:
An apparatus comprising one or more devices capable of modulating fluid flow, said fluid being a liquid or a gas resulting in a pressure fluctuation in a fluid flowing within a flow channel, comprising: a flow modulating device that acts as a servo valve, said device comprising a shaft and a moveable actuator that slides along said shaft, wherein said shaft and said actuator are positioned at a 90 degree angle within a principal fluid flow channel such that the fluid flows through said principal fluid flow channel and such that fluid flowing within said principal fluid flow channel also allows for fluid flow within both an inner pilot flow channel and said principal fluid flow channel, wherein said actuator comprises an upper outer seal and a lower outer seal, an upper inner seal and an lower inner seal, wherein said upper outer seal and said lower outer seal prohibit fluid particulates from entering said upper inner seal and said lower inner seal respectively and wherein said inners seals are situated back to back away from each other in that said upper inner seal has an upper “U” shaped portion facing upwardly and said lower inner seal has a “U” shaped portion facing downwardly so that said upper inner seal and said lower inner seal function independently in the presence of elevated pressure and wherein said upper inner seal and said lower inner seal is preloaded such that when pressure first acts on said upper inner seal and said lower inner seal both inner seals are activated and expand into place stopping fluid from leaking through into the space between said upper inner seal and said lower inner seal and a shaft mating surface and wherein a seal support structure for both inner seals must include a clearance between both inner seals and said shaft that prevents said inner seals from being deformed and squeezed into the space between said seal support structure and said shaft, wherein said clearance must prevent jamming due to said fluid particulates, but also provide and allow for axial movement of said inner seals along said shaft and wherein said upper inner seal, said lower inner seal, said upper outer seal and said lower outer seal is combined into a single sealing system and/or alternatively said upper outer seal and upper inner seal may be combined into a single unit and said lower inner seal and said lower outer seal may be combined into a single unit.