Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves

Product catalog summary

Introduction
This manual provides comprehensive guidance on the installation, maintenance, and parts ordering for Fisher EHD and EHT sliding-stem globe-style control valves, specifically for sizes NPS 8 through 14. It underscores the necessity of proper training and qualification to prevent personal injury or property damage.

Specifications
The valves are engineered for high-pressure applications, featuring metal seats and cage guiding. They include balanced valve plugs with piston rings or pressure-assisted seal rings, and bore seal trim for high-temperature applications up to 593°C (1100°F). Compatibility with various ASME standards for pressure and temperature ratings is ensured.

Installation
Proper installation is critical for safety and functionality. The manual advises using protective gear and pressure-relieving devices, and provides detailed installation steps, including pipeline cleaning and ensuring correct flow direction. Special considerations are given for valves with small internal flow passages, recommending upstream strainers to prevent blockages.

Principle of Operation
The EHD and EHT valves operate on a balanced design, reducing actuator force requirements by balancing pressure on the valve plug. This section explains the mechanics of pressure registration on the valve plug during operation.

Maintenance
Regular inspection and maintenance are essential due to normal wear. The manual outlines procedures for packing lubrication, maintenance, and trim maintenance, emphasizing safety measures such as relieving process pressure and using lock-out procedures during maintenance.

Packing Lubrication and Maintenance
For PTFE-impregnated composition packing, a lubricator or lubricator/isolating valve is recommended. Instructions for operating these devices are provided, with cautions against lubricating graphite packing or packing used in oxygen service.

Additional Information
The manual includes tables detailing specifications, shutoff classifications, and approximate weights of valve assemblies. Contact information for Emerson Process Management's educational services is provided for further training opportunities.

Procedures

Packing Leakage: If leakage occurs, tighten packing flange nuts to the recommended torque. If leakage persists, inspect for worn or damaged components and replace packing if necessary.
Replacing Packing: Detailed steps are provided for safely removing and replacing packing components, including warnings to prevent injury or damage during the process.
Trim Removal: Instructions for removing the actuator, bonnet, and seat ring are provided, along with precautions to protect gasket surfaces.
Valve Plug Maintenance: Procedures for maintaining EHD and EHT valve plugs, including replacing stems and handling piston rings, are outlined.

Warnings and Cautions
The document includes multiple warnings to prevent personal injury and equipment damage, emphasizing the importance of following proper procedures and using approved materials.

Recommendations
The document advises using anti-seize lubricant for bolting procedures and highlights the importance of using new components when replacing valve plugs and stems to ensure reliability.

Key Sections

Specifications and Tools: The manual specifies the use of appropriate tools such as punches, screwdrivers, and strap wrenches for various tasks. It emphasizes the importance of using high-temperature lubricants and genuine Fisher replacement parts to ensure proper valve function and warranty validity.
Valve Disassembly and Inspection: Detailed steps are provided for disassembling the valve, including removing the retainer and Bore Seal plug seal. It advises inspecting seating surfaces for wear or damage to ensure proper valve operation.
Maintenance Procedures: Instructions for lapping and remachining metal seats are included, highlighting the importance of maintaining seating surfaces for optimal valve performance.
Trim Replacement: The document outlines the process for replacing trim parts, including applying lubricants and correctly orienting the Bore Seal plug seal based on fluid flow direction.
Actuator Mounting: Procedures for mounting the actuator to the valve are detailed, including aligning the actuator travel indicator and ensuring correct valve plug travel.
Parts Ordering and Kits: Guidance is provided for ordering replacement parts, emphasizing the use of serial numbers and part numbers. The manual lists available parts kits, including ENVIRO-SEAL packing retrofit and repair kits.
Warnings and Cautions: The manual includes several warnings to prevent damage and ensure safety, such as avoiding the use of non-genuine parts and ensuring proper seating force to prevent leakage.

Figures and Tables
The document contains figures illustrating valve components and assembly steps, as well as tables listing part numbers and descriptions for ordering.

Catalog excerpts

Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-1

Instruction Manual Fisherr EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Educational Services . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Packing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Packing Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 7 Replacing Packing . . . . . . . . . . . . . . . . . . . . . . . . 7 Trim Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 EHD, EHT Valve Plug Maintenance . . . . . . . . . . . . . 12 Lapping Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Trim Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Retrofit: Installing Bore Seal Trim . . . . . . . . . . . . . . 17 Replacement of Installed Bore Seal Trim . . . . . . . . 19 Trim Removal (Bore Seal Constructions) . . . . 19 Lapping Metal Seats (Bore Seal Constructions) . . . . . . . . . . . . . . 20 Remachining Metal Seats (Bore Seal Constructions) . . . . . . . . . . . . . . 20 Trim Replacement (Bore Seal Constructions) . . . . . . . . . . . . . . 20 Actuator Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 22 Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Parts Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Bonnet Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 1. Fisher EH Series Control Valve with 667 Actuator Introduction Scope of Manual This instruction manual includes installation, maintenance, and parts ordering information for NPS 8 through 14 Fisher EHD and EHT sliding-stem globe-style control valves. Refer to separate manuals for instructions covering the actuator, positioner, and accessories. Do not install, operate, or maintain an EH 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 Process Management sales office before proceeding.

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Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-2

Instruction Manual End Connection Styles(1) Buttwelding: All available ASME B16.25 schedules that are compatible with ASME B16.34 pressure/temperature ratings Flanged Ends: CL1500 or 2500 J raised-face (RF) or J ring-type joint (RTJ) flanges per ASME B16.5 Shutoff Classifications See table 2 Bore seal trim: High-temperature, Class V. See table 3 Flow Characteristic Standard Cages: J Linear, J equal percentage, or J modified equal percentage(2) Whisper Trim™ III Cages: J Linear or J modified characteristics available upon request Flow Direction Normally flow down (in through the cage windows and...

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Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-3

Instruction Manual Educational Services For information on available courses for the Fisher EH NPS 8 through 14 valve, as well as a variety of other products, contact: Emerson Process Management Educational Services - Registration Phone: 1-641-754-3771 or 1-800-338-8158 E-mail: [email protected] http://www.emersonprocess.com/education Table 3. Additional Shutoff Classification Valve Design (PRESSURE RATING) Port Diameter, Inches Cage Style ANSI/FCI Leakage Class Equal Percentage Modified Equal Percentage Linear (std. cage) Linear (Whisper III, A1, B3, C3) V with optional Bore seal trim Equal...

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Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-4

Instruction Manual CAUTION The valve configuration and construction materials were selected to meet particular pressure, temperature, pressure drop, and controlled fluid conditions. Because some body/trim material combinations are limited in their pressure drop and temperature range capabilities, do not apply any other conditions to the valve without first contacting your Emerson Process Management sales office. If hoisting the valve, use a nylon sling to protect the painted surfaces. Carefully position the sling to prevent damage to the actuator tubing or any accessories. Also, take precautions...

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Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-5

Instruction Manual Principle of Operation Key numbers referenced in this section are shown in figure 12 for the EHD valve and in figure 14 for the EHT valve. EHD and EHT valves are balanced designs. When they are opening or closing, pressure registers on top of the valve plug (key 3) through the registration holes in the plug. The force of the pressure on top of the plug balances the force of the pressure on the bottom of the plug to reduce the actuator force required. Maintenance Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance...

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Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-6

Instruction Manual 8. After all maintenance is complete, refer to the Trim Replacement procedure to assemble the valve body. Note If the valve has ENVIRO-SEAL™ live-loaded packing installed, see the Fisher instruction manual titled ENVIRO-SEAL Packing System for Sliding-Stem Valves (D101642X012) for packing instructions. If the valve has HIGH-SEAL live-loaded packing installed, see the Fisher instruction manual titled HIGH-SEAL Live-Loaded Packing System (D101453X012) for instructions. Figure 2. Lubricator and Lubricator/Isolating Valve 14 LUBRICATOR/ISOLATING VALVE Packing Lubrication WARNING...

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Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves-7

Instruction Manual A lubricator or lubricator/isolating valve (figure 2) is recommended for PTFE-impregnated composition packing. The lubricator or lubricator/isolating valve is installed in place of the pipe plug in the bonnet. Use a good quality silicon-base lubricant. Do not lubricate packing used in oxygen service or in processes with temperatures over 260_C (500_F). To operate the lubricator, turn the cap screw clockwise to force lubricant into the packing box. The lubricator/isolating valve operates the same way except open the isolating valve before turning the cap screw and then close...

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