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Download Emerson A11 Data Sheet
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Product Bulletin A11 Valve 21.1:A11 May 2013 D500203X012 Figure 1. Available Seal Configurations BACK-UP RING BODY SEAL RING GRAPHITE GASKET LARGEST OUTSIDE DIAMETER BACK-UP RING SEAL RING RETAINING RING VALVE DISC HIGH PRESSURE AT SHUTOFF 2 VALVE DISC SOFT SEAL WITH BACK-UP O-RING BODY RETAINING RING PHOENIX III FIRE-SAFE SEAL LARGEST OUTSIDE DIAMETER GRAPHITE GASKET NOVEX SEAL SEAL RING HIGH PRESSURE AT SHUTOFF 1 LARGEST OUTSIDE DIAMETER BODY VALVE DISC CRYOGENIC SEAL GRAPHITE GASKET SEAL RING VALVE DISC METAL SEAL CRYOGENIC SEAL RING HIGH PRESSURE AT SHUTOFF 1 HPS SEAL RING BODY RETAINING RING E0578 RESILIENT INSERT HIGH PRESSURE AT SHUTOFF 1 RETAINING RING VALVE DISC GRAPHITE GASKET LARGEST OUTSIDE DIAMETER BODY HIGH PRESSURE AT SHUTOFF 1 BODY RETAINING RING VALVE DISC HIGH PRESSURE AT SHUTOFF 1 HIGH-PRESSURE SEAL (HPS) Notes: 1 This unidirectional seal must be installed so that the retaining ring is downstream from the high pressure side of the valve at shutoff, as shown. 2 For this bidirectional seal, the “preferred” valve orientation places the retaining ring downstream from the high pressure side of the valve at shutoff. Installation Preferred valve orientation for the A11 valve is reverse flow direction. Reverse flow direction is into the side of the valve body opposite the retaining ring or into the shaft side of the disc. For erosive and many severe service applications, valves with bidirectional seals can and should be installed with the shaft horizontal and in the forward flow direction to prevent direct impingement of the process media on the seal, and to minimize the exposure of the shaft bearings to the process media. 4 The standard soft seal and the Phoenix III seal both offer bidirectional shutoff. Valves using either metal, NOVEX, or cryogenic seals are unidirectional and must be installed in the reverse flow orientation. For assistance in selecting the appropriate combination of actuator action and open valve position, consult your Emerson Process Management sales office. Dimensions and weights for wafer-style and single-flange valves are shown in figures 3, 4, 5, 6, and 7.
