A combination seal connects a filter or an equipment component to a base. The combination seal includes a seal material and flecks or particles made of intumescent material interspersed within the seal material. The flecks or particles of intumescent material undergo a chemical change when exposed to flames or heat and expand to maintain seal effectiveness and longevity without compromise.

A quick-fitting pipe fitting assembly for coupling with at least one pipe element includes a pipe fitting body, at least one coupling unit, and at least one gasket. Each coupling unit includes a fixed coupling element integrally extended from the pipe fitting body and a movable coupling element, the gasket disposed at the coupling unit, the connecting elements movably connect the fixed coupling element with the movable coupling element, wherein the at least one coupling unit is adapted for being preassembled with the at least one pipe element and can be fastened by at least one fastening element that is capable of being operated to fasten the movable coupling element with the fixed coupling element.

An electrical isolator comprising: a first fluid-carrying member and a second fluid-carrying member spaced apart from said first fluid-carrying member; a resistive, semi-conductive or non-conductive component located between said first and second fluid-carrying member, wherein said resistive, semi-conductive or non-conductive component is adapted to convey fluid flowing from said first fluid-carrying member to said second fluid-carrying member; wherein said first fluid-carrying member comprises a first annular projection extending radially outwardly, and said second fluid-carrying member comprises a second annular projection extending radially outwardly such that an annular cavity is formed between the first and second annular projections; wherein the electrical isolator further comprises: a layer of circumferentially wound fiber-reinforced polymer in the annular cavity; and a layer of helical wound fiber-reinforced polymer extending over the first annular projection, the annular cavity and the second annular projection.

A coupling for joining pipe elements has segments surrounding a central space with cusps which engage lobes of a seal to maintain the segments in spaced apart relation in a preassembled state. While the coupling is in the preassembled state the pipe elements may be inserted into the central space without disassembling the coupling, and portions of the seal adjacent to attachment members on the segments seat within a channel defined by the segments between the cusps. The lobes of the seal contact a second surface of the shoulders of the segments adjacent to the attachment members when the segments are in spaced relation.

A pipe coupling has two segments with angularly oriented action surfaces in facing relationship. The action surfaces induce relative rotation between the segments when the segments are drawn together to engage the pipe elements being joined. Attachment elements on each segment, in the form of lugs, accommodate adjustable fasteners which draw the segments together when tightened. Angularly oriented support surfaces on the lugs engage one another and react the fastener force. Stop surfaces are positioned on the lugs adjacent to the support surfaces. Engagement between the stop surfaces limits the relative rotation between the segments.

A pre-assembled pipe coupling (11) includes a gasket (200), a housing (12) surrounding the gasket, and a fastener (20). The housing has three segments sequentially coupled to each other to define an insertion boundary. A first segment (12c) includes a first mount (18) extending lateral in a first direction from the wall and having a plurality of first lateral walls that define a first aperture (22), and a second mount (18) extending laterally in a second direction from the wall, the second mount having a plurality of second lateral walls that define a second aperture (22). A second segment (12a) includes a first hook (14) disposed in the first aperture and a first tab (16) defining a first fastener aperture. A third segment (12b) includes a second hook (14) disposed in the second aperture and a second tab (16) defining a second fastener aperture. The fastener is disposed through the first fastener aperture and the second fastener aperture.

A belt has a sealing ring disposed in an annular recess of the belt and two tightening lugs born by the ends of the belt. The edges of the recess form wedging steps for the edges of the sealing ring which substantially occupy the entire width of the recess. The ends of the belt exhibit a sealing arrangement which includes lateral tabs, that are formed at the second end and which extend widthwise on the belt, from one edge of the belt to the recess such that each lateral tab includes a part of one of the wedging steps.

A thick-wall compression pipe fitting, comprising: a thick-wall fitting body for connecting arranged between two thick-wall steel pipe bodies for connection, wherein a sealing ring, a positioning retainer and a teeth ring is disposed between said thick-wall fitting body and said thick-wall steel pipe bodies. Said thick-wall fitting body includes a middle connecting section, a first flared section and a second flared section extending to both sides to adopt a thick wall metal pipe. A special crimping tool is used to deform the fitting body for crimping to compress the socket section of the fitting body having a sealing ring and a high-strength teeth ring, so that the sealing ring in the socket section groove seals the steel pipe to stop leakage, wherein the high-strength teeth ring shrinks and firmly fastens the steel pipe so that the connection between the fitting body and the steel pipe can be completed instantly.

A coupling for joining pipe elements has segments surrounding a central space with cusps which engage lobes of a seal to maintain the segments in spaced apart relation in a preassembled state. While the coupling is in the preassembled state the pipe elements may be inserted into the central space without disassembling the coupling, and portions of the seal adjacent to attachment members on the segments seat within a channel defined by the segments between the cusps. When the seal is compressed between the segments and the pipe elements to form a joint the seal deforms so as to withdraw a center leg of the seal from the flow path defined within the pipe elements.

A pipe coupling includes first and second coupling segments, an inner surface of each of the first and second coupling segments defining first and second ring grooves, the inner surface of each of the first and second coupling segments including transition portions on either side of the respective ring grooves, each of the first and second ring grooves defining a groove bottom surface positioned radially outward from each of the respective transition portions; a first pipe connection ring disposed within the first ring groove and a second pipe connection ring disposed within the second ring groove, each of the respective pipe connection rings including: an outer flange aligned with an axial direction of the respective pipe connection ring and received within the respective ring groove; and an inner flange connected to the outer flange and angled with respect to the outer flange.