Product Name: Fisher Packing Selection Guidelines for Fisher™ Sliding-Stem Valve
Brand: Fisher
Product Code: Packing Selection Guidelines for Fisher™ Sliding-Stem Valve
Tags: Fisher
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This bulletin provides information and insight to help you select Fisher packing systems properly. The following application guidelines have been developed to aid in the packing selection process. It is important to note that these guidelines were developed based on the results of numerous tests on various packing systems conducted in the Emerson laboratory. Exceeding these guidelines might result in reduced service life.ENVIRO-SEAL™ packing systems provide an improved stem seal to help prevent the loss of process fluid.The stainless steel materials, specialized seals, and extension bonnet are designed to meet cryogenic temperature requirements.The metal-to-metal seat is designed and manufactured to provide long-lasting, reliable, tight shutoff at both ambient and cryogenic temperatures, without the need for periodic lapping.Rugged cage guiding for the ET-C and EWT-C provides high valve plug stability, which reduces vibration and mechanical noise.ET-C and EWT-C balanced valve plugs permit the use of smaller, lower-cost Fisher actuators.Low flow requirements can be satisfied with standard restricted-capacity trim or with Micro-Form, Micro-Flute, or Micro-Flow valve plugs.Extensive cryogenic testing during the development of the valve design reduces the need for expensive cold testing for most applications, which results in quicker delivery and greater value.