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Gem Lock is reliable and faster to install than welding,threading or flanging, resulting in lower installed cost.Triple sealing of the <br /> t-shaped pressure responsive gasket is made from specially compounded rubber polymers with low compression set properties. Couplings <br /> perform equally well under pressure and vacuum.Couplings with Tri-seal gaskets are highly suitable for higher vacuum service and dry <br /> systems subject to freezing.Couplings are available for flexible and rigid systems, and are all pre-lubricated. <br /> HOUSINGS GASKETS <br /> Ductile iron housing segments conforming to ASTM-A The sealing efficiency of gaskets is such that the gasket <br /> 536 Grade 65-45-12 which fully enclose the gasket. forms an initial seal as it is stretched over the pipe ends.As <br /> The housing keys engage into the grooves around the housing segments are installed and secured the pressure <br /> the full pipe circumference,securing the pipe ends responsive gasket is slightly compressed to form a leak tight <br /> together with a positive grip. Housings are normally joint.The strength of the seal is further enhanced by <br /> two identical castings for couplings through 12"sizes. internal line pressure that creates downward pressure on <br /> The housing is designed to provide the optimum the lips of the gasket.The gasket also seals well under <br /> combination of pressure,stress relief and end load vacuum conditions up to 10inHg (435 Bar)which may <br /> conditions while maintaining reasonable weight and occur when a system is drained. Please refer to the gasket <br /> manufacturing characteristics. Every grooved pipe selection guide for additional details and gasket materials. <br /> coupling,flange adaptor and reducing coupling has a Gaskets are prelubricated for easy assembly of the coupling <br /> similar key section.This engages fully into the groove but should be lightly lubed for further ease of assembly and <br /> m the joint integrally to the a performance. <br /> tying joint 9 Y P�P <br /> Roil or cut grooved <br /> standard steel pipe. <br /> BOLTS AND NUTS <br /> Oval neck track bolt conforming to ASTM A183 with minimum tensile strength of 110,000 psi or square neck carriage bolt to <br /> ASTM A446 with 120,000 psi minimum tensile strength permits tightening of the nuts from one side with a single wrench. <br /> f Nuts conform to ASTM A194. Bolts and nuts are electro galvanized. <br /> { <br /> 60 0 : 84 <br />