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

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

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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: education@emerson.com 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...

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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...

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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...

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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...

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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...

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