Abstract A gate valve comprising a valve body having inlet and outlet portions with curved walls of circular cross-section defining a flow passage, a gate blade slot between said inlet and outlet portions, a pair of annular seat members formed integrally with the walls of the flow passage and defining a gate blade receiving pocket therebetween, a gate blade having a semicircular end projecting through the slot having a groove of V-shaped crosssection in the peripheral edge face thereof, the blade being encapsulated in a layer of resilient material whereby during closing the resilient blade coating is pressed into leak tight engagement with both seat members, and, the V-shaped groove edges scrape the seat members clean, while build-up of pulp in the pocket is prevented.
A gate valve comprising: a valve body having inlet and outlet portions with curved walls of circular cross-section defining a flow passage, the flow passage comprising a pair of axially spaced cylindrical members with the inner end faces of said cylindrical members forming valve seats; a gate blade slot between said inlet and outlet portions; a pair of annular seat members formed integrally with the walls of the flow passage and defining a gate blade receiving pocket therebetween; a gate blade having a semicircular end projecting through the slot, said gate blade having a groove of V-shaped cross-section in the peripheral edge face thereof; said gate blade receiving pocket extending beneath the cylindrical members and wherein the inner end faces of the cylindrical members project inwardly beyond the side walls of the pocket; resilient material encapsulating said blade whereby during closing the resilient material is pressed into leak-tight engagement with both seat members, and, said V-shaped groove edges scrape the seat members clean.
Claim 2
Dependent Claim
163 words
A gate valve comprising: a valve body having inlet and outlet portions with curved walls of circular cross-section defining a flow passage, the flow passage comprising a pair of axially spaced cylindrical members with the inner end faces of said cylindrical members forming valve seats; a gate blade slot between said inlet and outlet portions; a pair of annular seat members formed integrally with the walls of the flow passage and defining a gate blade receiving pocket therebetween; a gate blade having a semicircular end projecting through the slot, said gate blade having a groove of V-shaped cross-section in the peripheral edge face thereof; said gate blade receiving pocket extending beneath the cylindrical members and wherein the inner end faces of the cylindrical members project inwardly beyond the side walls of the pocket; resilient material encapsulating said blade whereby during closing the resilient material is pressed into leak-tight engagement with both seat members, and, said V-shaped groove edges scrape the seat members clean.
Claim 3
Dependent Claim
20 words
A gate valve according to claim 1, wherein said seat members have ridges on their periphery engaging said gate blade.