초록 ▼

The invention is a bellows valve which seals the stem of the valve. Dirt and other contaminants are trapped by the bellows. The valve includes a cover having a sintered metal filter therein. The filter permits gas to flow therethrough but does not permit dirt or other particulate contamination to fl

The invention is a bellows valve which seals the stem of the valve. Dirt and other contaminants are trapped by the bellows. The valve includes a cover having a sintered metal filter therein. The filter permits gas to flow therethrough but does not permit dirt or other particulate contamination to flow therethrough. Pressure is equalized across the wails of the bellows allowing the valve to operate at high pressures while ensuring that the gas or fluid transported through the valve is kept clean.

대표청구항 ▼

A valve comprising a body; said body includes a passageway therethrough; a stem; a stem end; said stem end affixed to said stem and moveable therewith; a cover affixed to said body; a bellows; said bellows includes an interior and an exterior; said bellows affixed and sealed to said stem end and sai

A valve comprising a body; said body includes a passageway therethrough; a stem; a stem end; said stem end affixed to said stem and moveable therewith; a cover affixed to said body; a bellows; said bellows includes an interior and an exterior; said bellows affixed and sealed to said stem end and said cover; said cover includes a filter; said stem end moveable between first, closed, and second, open, positions; said stem end engaging said body and prohibiting fluid flow through said passageway of said body when said stem end is in said first, closed position; said stem end permitting fluid flow through said passageway of said body when said stem end is in said second, open position; a packing; said packing sealingly engaging said cover and said stem; said filter permits pressurization of said interior of said bellows such that the pressure on said interior and exterior of said bellows is substantially equal when said stem end is in said second, open position; and, said filter prohibiting entry of contaminants into said passageway of said body.