Emerson Fisher EWT-C User Manual

www.Fisher.com
Fisher
™
EZ‐C, ET‐C, and EWT‐C Cryogenic
Sliding‐Stem Control Valves
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Specifications 2...............................
Educational Services 3.........................
Installation 3..................................
Maintenance 5.................................
Packing Maintenance 7.........................
Replacing Packing 7........................
Trim Maintenance 10..........................
EZ‐C Trim Disassembly 10...................
EZ‐C Trim Assembly 11.....................
ET‐C and EWT‐C Trim Disassembly 12.........
ET‐C and EWT‐C Valve Plug Maintenance 13....
ET‐C and EWT‐C Trim Assembly 14...........
Coining Soft Metal‐to‐Metal Seats 14.........
Parts Ordering 14...............................
Parts Kits 15...................................
Parts List 18...................................
Bonnet Parts 18...............................
EZ‐C Valve Body Parts 18.......................
ET‐C and EWT‐C Valve Body Parts 22..............
Figure 1. Typical Fisher Cryogenic Valve with
Extension Bonnet and 585C Series Actuator
W6370
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for Fisher EZ‐C, ET‐C and EWT‐C
valves (see figure 1). Refer to separate manuals for instructions covering the actuator and accessories.
Do not install, operate, or maintain EZ‐C, ET‐C or EWT‐C valves 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
or Local Business
Partner before proceeding.
Description
EZ‐C: globe‐style, single‐port, unbalanced valves with integral end connections, post guiding, metal‐to‐metal seating,
and quick‐change trim. They feature stainless steel construction materials and fabricated extension bonnets.
ET‐C and EWT‐C: metal‐to‐metal seated globe‐style, single‐port, cage‐guided, pressure‐balanced valves featuring
stainless steel construction materials and fabricated extension bonnets.
Instruction Manual
D102175X012
EZ-C, ET-C, and EWT-C Valves
July 2017

Emerson Fisher EWT-C Specifications

General

Brand	Emerson
Model	Fisher EWT-C
Category	Control Unit
Language	English

Summary

Introduction to Fisher Valves

Scope of Manual

Details installation, maintenance, and parts for EZ-C, ET-C, and EWT-C valves.

Valve Description

Describes the features of EZ-C, ET-C, and EWT-C cryogenic valves.

Valve Specifications and Ratings

Valve Sizes and Connections

Pressure and Temperature Capabilities

Provides maximum inlet pressure and material temperature limits.

Flow Characteristics and Shutoff

Installation Procedures

General Installation Safety

Emphasizes protective gear and potential hazards during installation.

Installation Guidelines and Precautions

Mounting and Insulation Precautions

Maintenance Overview

Pre-Maintenance Safety Warnings

Lists critical safety warnings before performing maintenance operations.

Packing Maintenance

Packing Types and Instructions

Troubleshooting Packing Leaks

Replacing Valve Packing

Bonnet Removal Safety

Warns about potential injury from uncontrolled bonnet movement during removal.

Valve Bonnet Procedures

Bonnet Removal Steps

Details steps for loosening and removing the bonnet from the valve body.

Bonnet Installation and Warnings

Installing the Bonnet and Gasket

Covers installing a new bonnet gasket and mounting the bonnet onto the valve body.

Bolting and Stud Installation

Explains bolting sequence, tightening, and proper stud installation for bonnet.

Using Approved Parts Warning

Warns against using unapproved parts to avoid equipment damage or injury.

Packing Installation and Trim Maintenance

Packing Installation Steps

Details installing new packing, follower, wiper, and flange.

Actuator Mounting

EZ-C Trim Disassembly

Steps for disassembling the EZ-C valve trim components.

EZ-C Trim Disassembly

Valve Trim Component Removal

Details removing the valve plug, stem, seat ring, and gaskets.

EZ-C Trim Assembly

Stem and Plug Assembly

Guides on assembling the stem and plug with torque specifications.

Seat Ring and Bushing Installation

EZ-C Trim Assembly Procedures

Plug and Stem Assembly

ET-C and EWT-C Trim Disassembly

Trim Component Removal

Details removing seat rings, disk seats, retainers, and cages.

Valve Plug Maintenance

ET-C and EWT-C Valve Plug Maintenance

Seal Ring Replacement

Guides on replacing the seal ring, backup ring, and retaining ring on the valve plug.

ET-C and EWT-C Trim Assembly

Stem and Plug Assembly

Cage, Gasket, and Load Ring Installation

Coining Soft Metal-to-Metal Seats

Parts Ordering

Part Number Identification

EZ-C Valve Plugs

Valve Plug Styles and Materials

ET-C and EWT-C Valve Plugs

Plug Styles and Materials