AP Services, a product and service brand of Curtiss-Wright, manufactures valve and pump packing products that have the lowest leak rates and friction in the industry. After extensive testing, AP Services has found that excessive packing rings increase friction and cause poor gland load transfer, resulting in less than optimum performance. AP has cured this problem by utilizing Graphite Bushings to take up space previously occupied by excessive packing rings. Style 5005 & 5010 Graphite Bushings provide stem support on valves that are mounted horizontally or on an angle, make up for poor valve clearances, and aid in stem alignment resulting in better valve performance, seat loading, and longer packing life.
AP Services Graphite Bushings are manufactured from fine-grained, high density, high purity, isotropic graphite with high compressive strength and low coefficient of thermal expansion. The bushings are supplied vertically split and precision machined to specific clearances to fit into each stuffing box. To aid in removal, each bushing is drilled and tapped on one end.
Style 5005 & 5010 Graphite Bushings are extremely durable and designed to be a permanent fixture once installed. The difference between the two styles is compressive strength. Style 5010 High Density Bushings are superior performing and designed to handle the harshest applications. Style 5005 & 5010 Graphite Bushings can be manufactured to exact tolerances and are available in standard or specified lengths.
AP Services recommends that if the stuffing box and/or packing gland are angled, the graphite bushing should be machined to the matching angle or a cushioning material be placed between the two surfaces. Please contact AP Services with your specific requirements and any questions.
||Style 5005 – 110 lbs./cu. ft.
Style 5010 – 112 lbs./cu. ft.
1”, 2”, 4”, & 6” long (other lengths available upon request)