Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Special Cap Screws with reduced body diameter to resist fatigue 1/8 in. (3 mm) Nominal Gap Required 12-Point Cap Screw (Center Bolt) Valve Retainer Threaded Washer Suction Valve Plate Metallic Flat Valve Gasket Seat Guard Suction Valve Springs Valve Cap O-Ring Cushion Plate SUCTION VALVE Guide Ring Wafer Spring FIGURE 5-48 TYPICAL VALVE ASSEMBLIES Tightening Valve Cap Bolting Cylinder Bore Plastic Retainer- Keeper Wafer Spring Discharge Valve Springs Cushion Plate Proper fastener tightening technique is essential for sealing of valve caps with soft metallic wire gaskets used in some high pressure cylinders. It is important to draw up bolting to full torque in even and gradual steps. Do not allow the valve cap to be tightened with bias on one cap screw or to become cocked in the bore. Such bias or cocking can cause uneven crush of a wire gasket that could cause a leak, and could also cause cap screw failure. This step tightening procedure is also necessary for all valve caps. Install the valve assembly (and high clearance spacer, when applicable), with the preformed gasket and valve retainer, in the valve pocket. See “Valves - Reassembly” on Page 5-57 Lubricate and install a new o-ring, or for high pressure applications place a new, proper, soft metallic wire gasket on the retainer or cap and install the valve cap. Be careful not to gouge the bore, distort or damage the metallic wire gasket. Always use a new metallic wire gasket; wire gaskets are not reusable. 7/09 PAGE 5 - 59 Valve Cap Guide Ring Seat DISCHARGE VALVE Metallic Flat Valve Gasket Guard Discharge Valve Plate
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Lubricate cap screw threads and seating surfaces with petroleum type lubricant, and install cap screws. Do not use anti-seize compounds on valve cap bolting. Tighten each cap screw until snug using an alternating (criss-cross) pattern. Next, tighten each cap screw to 25% of full torque, moving across from cap screw to cap screw, in an alternating (criss-cross) pattern. See Figure 5-49 1-2-3-4-5-6. Repeat this step for 50%, 75% and 100% of full torque. If the assembly is correct, the distance from the underside of the cap to the valve boss surface on the cylinder will be a uniform 1/8 inches (3 mm) nominal gap. For high pressure cylinders that use a soft metallic wire gasket in lieu of the o-ring design, continue to repeat the 100% full torque step until the cap screws no longer rotate, to properly deform the wire gasket. Valve Cap FIGURE 5-49 HIGH PRESSURE VALVE CAP ASSEMBLY - TYPICAL Proper tightening and torque procedures are important for all valve caps, but are particularly important for high pressure valve cap assemblies. High pressure applications have caution plates on the cylinders. These plates are stamped with proper valve cap bolting torque values: ! Metallic Wire Gasket Valve Retainer CAUTION Valve Assembly SEVERE PERSONAL INJURY AND PROPERTY DAMAGE CAN RESULT IF VALVE CAP BOLTING IS NOT INSTALLED TO PROPER TORQUE OF ______ FT.-LBS. ______ N·m. REFER TO TECHNICAL MANUAL FOR PROPER TORQUING PROCE- DURE. Preformed Metallic Gasket PAGE 5 - 60 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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