| 摘要 |
A membrane operated, pilot actuated, normally open two way shutoff valve having a pilot cap permanently secured to the valve housing, and a membrane separating piloting section from the valving section and held securely by a pilot cap at it's periphery while the central portion is allowed to stretch under pilot pressure and to close fluid valving passages inside valve housing when controlling flows of any fluid requiring straight through flow passages with minimum pressure drop, including positive support for stretched membrane inside valve housing which is provided with appropriate seat of conical configuration to permit membrane elastic deformation within confines of such housing cone and not more, and thus drastically changing the operation and life span of similar valves with unsupported elastomers as found in most diaphragm valves, with membrane providing simplicity and operational improvements, and the Memrane Shutoff Valve permitting flexibility in use no other designs can provide,such as multiporting valve housing for single fluid inlet port and multiple outlet ports running radially into the conical housing chamber or even being converted to a positive displacement pump by an addition of appropriate check valves into the valve ports, and flexibility in selecting seal and valve body materials compatible with corrosive fluids valved while the pilot cap may remain the same.
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