초록 ▼

A bidirectional valve useful at all temperatures from cryogenic to extreme fire temperatures. The sealing means for the bidirectional valve comprises a metallic sealing element having a pair of spaced sealing lobes defined thereon which are coated with a Teflon compound. A third sealing lobe is defi

A bidirectional valve useful at all temperatures from cryogenic to extreme fire temperatures. The sealing means for the bidirectional valve comprises a metallic sealing element having a pair of spaced sealing lobes defined thereon which are coated with a Teflon compound. A third sealing lobe is defined on the metallic sealing element between the pair of sealing lobes and is constructed solely of metal. A pair of coated sealing lobes further function as wipers to prevent sand, dirt or similar foreign particles from becoming crushed between the valve disc and metallic sealing lobe during the final closing of the valve. When the valve is exposed to fire conditions, the Teflon coated sealing lobes melt out leaving the metallic lobe as the fire safe sealing lobe.

대표청구항 ▼

A valve body comprising a body member provided with a passageway for fluids, a valve disc rotatably mounted in the passageway for controlling the flow of fluids therethrough; bidirectional, metallic core sealing means mounted in the passageway of said body for coaction with the valve disc to seal of

A valve body comprising a body member provided with a passageway for fluids, a valve disc rotatably mounted in the passageway for controlling the flow of fluids therethrough; bidirectional, metallic core sealing means mounted in the passageway of said body for coaction with the valve disc to seal off the flow of fluid through the body member in both fluid flow directions through the passageway; said sealing means being constructed and defined to have a pair of spaced beadlike projections for sealing engagement with the edge of the valve disc; the sealing portion of the metallic sealing means having a thin layer of a thermally sensitive, resilient material bonded over said pair of spaced beadlike projections for engaging the valve disc in a leakproof fashion; said sealing means including a third beadlike projection arranged thereon and spaced from said pair of beadlike projections, said third beadlike projection being completely metallic and engaging the valve disc when it is moved to a closed position to provide a fire safe seal for the valve; and mechanical responsive spring means mounted adjacent the sealing means and providing a sealing load to compensate for any non-uniform expansion and contraction of adjacent parts of the valve during periods of rapid temperature changes to provide an essentially constant sealing load.