Introduction
This instruction manual provides comprehensive guidance for the installation, maintenance, and parts information for Fisher EHD, EHS, and EHT control valves, specifically for sizes NPS 1-1/2 x 1 through NPS 8x6. It is essential for users to be fully trained and qualified in valve and actuator installation, operation, and maintenance. This document emphasizes safety, detailing critical precautions to prevent personal injury and property damage. For any questions or further clarification, Emerson Process Management sales offices are available for assistance.
The manual covers various aspects including valve descriptions, specifications, shutoff classifications, and detailed procedures for maintenance tasks such as packing lubrication, packing maintenance, trim removal, and valve plug maintenance. It also includes information on parts ordering and lists.
For information on related equipment like actuators, positioners, and specific packing systems (ENVIRO-SEAL, HIGH-SEAL), refer to their respective manuals.
Key Features and Specifications
The Fisher EHD, EHS, and EHT valves are high-pressure globe valves featuring metal seats, cage guiding, and push-down-to-close valve plug action. The EHD and EHT models utilize balanced valve plugs, while the EHS model uses an unbalanced plug. Various shutoff classifications are available, including Class V for C-seal trim, suitable for high-temperature applications up to 593°C (1100°F).
The manual details end connection styles (Buttwelding, Flanged, Socket Welding), maximum inlet pressures, and flow characteristics (Equal percentage, Modified equal percentage, Linear). It also provides tables for shutoff classifications, torque recommendations, and approximate valve weights.
Maintenance and Installation
Proper installation is crucial for valve operation and safety. Key steps include ensuring the valve body cavity is free of foreign material, cleaning pipelines, and installing the valve with the actuator vertically above the body. The manual stresses the importance of following accepted piping and welding practices.
Maintenance procedures are thoroughly explained, including warnings about potential hazards such as sudden release of process pressure and packing leakage. Specific instructions are provided for packing lubrication, maintenance, and replacement, along with torque specifications for packing flange nuts and body-to-bonnet bolting.
For detailed information on specific packing systems like ENVIRO-SEAL and HIGH-SEAL, users are directed to consult the relevant Fisher instruction manuals.
Educational Services
Emerson Process Management offers educational courses for the Fisher EH valve and other products. For registration and information, contact Educational Services via phone at 1-641-754-3771 or 1-800-338-8158, or by email at education@emerson.com. Further details can be found at www.emersonprocess.com/education.
