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Fisher™ ENVIRO-SEAL™ Packing System
Enviroseal Diagram
Fisher ENVIRO-SEAL and HIGH-SEAL live-loaded packing systems offer exceptional stem sealing
capabilities. These systems easily install in your existing valves or can be purchased with new valves.
ENVIRO-SEAL and HIGH-SEAL packing systems help seal your process to conserve valuable process fluid and protect the environment against the emission of hazardous or polluting fluids. The long life and reliability of these systems also reduce your maintenance costs and downtime.

For process control applications requiring compliance with mandated environmental protection regulations, the unique ENVIRO-SEAL packing system and, for hazardous service, the ENVIRO-SEAL bellows seal system are offered. These packing systems keep fugitive emission concentrations below the 100 ppm (parts per million) requirement set by the federal Environmental Protection Agency (EPA).
Fisher™ ENVIRO-SEAL™ Packing System


Applicable Designs
CL600 (easy-e, YD, YS), CL1500 (CAV4, HPD, HPS, HPT), CL2500 (EHD, EHT, HPD, HPS, HPT)
Applicable Diameters
3/8", 1/2", 3/4", 1", 1-1/4", 2"
Maximum Temperatures
See Bulletin
Maximum Pressures
See Bulletin
Construction Materials
Carbon/graphite, graphite, zinc


  • Compliance with the Clean Air Act-- The excellent stem sealing of the ENVIRO-SEAL packing system (figure 1) controls emissions to below the EPA minimum of 100 ppm (parts per million). ENVIRO-SEAL packing systems provide an excellent stem seal to help prevent the loss of process fluid.
  • Improved Service Life-- ENVIRO-SEAL and HIGH-SEAL packing systems, coupled with a very smooth stem surface and live-loading, give you long service life with very low maintenance. The live-loading provides a constant load over the life of the packing material. This greatly reduces or, in many applications, helps to eliminate your need for packing box adjustment and maintenance. The installed packing system provides excellent sealing,guiding, and transmission of loading force.
  • Easy Installation in Existing Valves-- All parts needed to install the systems in existing valves are available in a convenient kit.
  • Adaptable to Many Applications-- ENVIRO SEAL systems are available with PTFE, Graphite ULF, or Duplex packing for 9.5 through 31.8 mm (3/8 through 1-1/4 inch) diameter valve stems on CL125 through CL600 valves. HIGH-SEAL systems with Graphite ULF packing are available for 9.5 through 50.8 mm (3/8 through 2 inch) diameter valve stems on CL600 through CL2500 valves. Standard ENVIRO-SEAL PTFE packing systems can be used in vacuum service with packing rings in the standard orientation. It is not necessary to reverse the PTFE packing rings.