Description

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EZ Valve with 657 Actuator and DVC6000 Digital Valve Controller

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Introduction

Scope of Manual

This instruction manual includes installation, maintenance, and parts information for NPS 1/2 through 4 Fisher EZ valves through CL600 ratings. Refer to separate manuals for instructions covering the actuator and accessories. Do not install, operate, or maintain an EZ valve without being fully trained and qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you have any questions about these instructions, contact your Emerson sales office before proceeding.

Description

EZ valves (figure 1) are globe‐style with integral end connections, post guiding, and quick‐change trim. These valvesare used in chemical or hydrocarbon processing applications or in applications that require control of nonlubricating,viscous, or other hard‐to‐handle fluids.

End Connection Styles

Cast Iron Valves

Flanged: CL125 flat‐face or 250 raised‐face flanges per ASME B16.1

Steel and Stainless Steel Valves

Flanged: CL150, 300, and 600 raised‐face or ring‐type joint flanges per ASME B16.5

Screwed or Socket Welding: Consistent with ASME B16.11

Buttwelding: All available ASME B16.25 schedules that are consistent with ASME B16.34

Maximum Inlet Pressure(1)

Cast Iron Valves Flanged: Consistent with CL125B or 250B per ASME B16.1

Steel and Stainless Steel Valves

Flanged: Consistent with CL150, 300, or 600 per ASME B16.34

Screwed or Welding: Consistent with CL600 per ASME B16.34

Optional Packing Lubricator and Lubricator/Isolating Valve

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Caution

1. Before installing the valve, inspect it and any associated equipment for damage and any foreign material. Make certain the valve interior is clean, that pipelines are free of foreign material, and that the valve is oriented so that pipeline flow is in the same direction as the arrow on the side of the valve.

2. The control valve assembly may be installed in any orientation unless limited by seismic criteria. However, the normal method is with the actuator vertical above the valve. Other positions may result in uneven valve plug and seat ring retainer wear, and improper operation. With some valves, the actuator may also need to be supported when it is not vertical.

3. Use accepted piping and welding practices when installing the valve in the line. Internal elastomeric parts may stay in place during the welding procedure. For flanged valves, use a suitable gasket between the valve body flange and pipeline flanges.

PTFE V‐Ring Packing Arrangements for Plain and Extension Bonnets

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Packing Lubrication

If an optional lubricator or lubricator/isolating valve (figure 2) is provided for PTFE/composition or other packings that require lubrication, it will be installed in an optional tapped hole in the bonnet. Use a good quality silicon‐base lubricant. Packing used in oxygen service or in processes with temperatures over 260 C (500 F) should not be lubricated. To operate the lubricator, simply turn the cap screw clockwise to force the lubricant into the packing box. The lubricator/isolating valve must first be opened and then closed after lubrication is completed.

Recommended Torque for Packing Flange Nuts (Not for Spring‐Loaded Packing)

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