EZ Sliding-Stem Control Valve
EZ valves (figure 2) are used for throttling or on-off control of a wide variety of liquids and gases. The single-port, globe-style body design offers quick-change trim and a post-guided, unbalanced valve plug. The EZ valve is used in chemical or hydrocarbon processing applications or wherever control of non-lubricating, viscous, or other hard-to-handle fluids is required. Metal-to-metal seating is standard for all general applications over a wide range of pressure drops and temperatures. Metal-to-PTFE seating is optional for nstringent shutoff requirements.
The Valve Family
Features
Trim Designed for Stability-- Post guiding provides valve plug stability with less chance of a sticking valve plug due to non-lubricating or sticky process fluids or build-up of entrained solids. Post guiding stabilizes the valve plug at all points in its travel range to reduce vibration, mechanical noise, and trim wear.
Compliance with the Clean Air Act-- ENVIRO-SEAL packing systems (figure 4) that provide an improved stem seal to help prevent the loss of process fluid are available. These packing systems feature PTFE, Graphite ULF, or duplex packing with live-loading for reduced packing maintenance.
Sour Service Capability-- Unless otherwise noted, references are to NACE MR0175-2002. Optional materials are available to meet NACE MR0103 and NACE MR0175 / ISO 15156. Material requirements under these standards vary by edition and year of issue; the specific standard must be specified.
Compliance with European Standards-- Valves are available with dimensions specified by EN/DIN standards. See figure 7.
Reliability-- The process fluid flows through the trim, flushing away solid deposits above and below the guide bushing, thus reducing the possibility of a sticking valve plug.
Easy Maintenance-- Quick-change trim, with a clamped-in seat ring, reduces the disassembly time. The valve body can stay in the pipeline during removal of trim parts for inspection or maintenance.
Application Flexibility-- Low-flow requirements can be satisfied with standard restricted-capacity trim or with Micro-Form, Micro-Flute, or Micro-Flow valve plugs. If flow requirements change, the valve can be converted to full-sized trim.
Economy-- Streamlined flow passages provide greater capacities than most globe valves of the same line size.
Trim Cartridge
In addition to traditional trim selections outlined in this product bulletin, some configurations of Fisher EZ control valves are also available with Trim Cartridge. Trim Cartridge combines all valve trim components plus the bonnet in a single, serialized cartridge. Trim Cartridge simplifies valve repair by streamlining valve repair procurement, inventory, and execution and is available as both a trim option in new valve assemblies or as a repair solution. In new valve assemblies, Trim Cartridge simplifies repair parts procurement, inventory, and budgeting. Trim Cartridge provides complete trim and bonnet repair in a single part number reducing the amount of part numbers to order and a single box to inventory. It also increases maintenance budgeting accuracy as Trim Cartridge provides a more consistent trim repair cost due to its streamlined installation and complete trim repair design. As a repair part, Trim Cartridge reduces a more than 20 part repair process to a single pre-assembled repair cartridge, seat ring gasket, and body to bonnet gasket. Each Trim Cartridge comes seat leak tested to CL V shut off and has pre-set ENVIRO-SEAL packing. Its factory assembled and tested design greatly reduces complexity and allows for streamlined installation and decreased repair time. Trim Cartridge can be utilized as a complete trim and bonnet repair solution for control valves with existing traditional trim or Trim Cartridge. Trim Cartridge contains ENVIRO-SEAL PTFE packing as the standard packing offering. Other available packing options are ENVIRO-SEAL Graphite ULF and ENVIRO-SEAL duplex. PEEK high temperature anti-extrusion rings are also available. Trim Cartridge is fully backward compatible and has the same flow characteristics as comparable traditional trim.
Trim Cartridge Table(1)
EZ Sectional with Optional Drain Plug
ENVIRO-SEAL, HIGH-SEAL Features
Excellent Sealing Capabilities-- The packing system provides excellent sealing, guiding, and transmission of loading force. The excellent sealing of the ENVIRO-SEAL system can control emissions to below the EPA (Environmental Protection Agency) minimum of 100 ppm (parts per million).
Improved Service Life-- ENVIRO-SEAL and HIGH-SEAL system design, very smooth stem surface, and live-loading combine to give you long service with very low maintenance. The external live-loading provides a constant load over the life of the packing material, which greatly reduces your need for packing box adjustment and maintenance.
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 or Graphite ULF packing for 9.5 through 31.8 mm (3/8 through 1-1/4 inch) diameter valve stems. HIGH-SEAL systems with Graphite ULF packing are available for 9.5 through 50.8 mm (3/8 through 2-inch) diameter valve stems. Standard ENVIRO-SEAL packing systems can be used in vacuum service with packing rings in standard orientation. It is not necessary to reverse the ENVIRO-SEAL PTFE packing rings.
EZ Valve with ENVIRO-SEAL Bellows Seal Bonnet
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