Fisher 667 Actuator Overview
The Fisher 667 actuator is a reverse-acting, spring-opposed diaphragm actuator. It is available in various sizes. This instruction manual provides information regarding installation, adjustment, and maintenance. The 667-4 actuator is also covered in this document.
This instruction manual provides comprehensive details for the Fisher 667 diaphragm actuators, specifically covering sizes 30/30i through 76/76i and size 87. It also includes information for the 667-4 actuator variations. The manual serves as a guide for installation, adjustment, maintenance, and parts ordering, ensuring users have the necessary information for proper operation and upkeep of these actuators. This document also covers bench set spring adjustments.
Fisher 667 Actuator Models and Sizes
The Fisher 667 actuators come in several models and sizes. These include sizes 30/30i through 76/76i, size 87, and also sizes 80 and 100. Variations also exist, like the 667-4 actuator.
Sizes 30/30i through 76/76i and Size 87
This section of the manual covers Fisher 667 diaphragm actuators in sizes 30/30i, 34, 36, 40, 45, 50, 60, 70, 76 and 76i, along with size 87. The instruction manual provides detailed information for installation, adjustment, maintenance, and parts ordering specific to these actuator sizes. It is important to refer to the correct manual for your specific actuator size to ensure proper operation and maintenance.
Sizes 80 and 100
This part of the manual focuses on the Fisher 667 actuators in sizes 80 and 100. It offers instructions for installation, adjustment, maintenance, and parts ordering specific to these larger models. This section provides details on the unique aspects of these larger actuators, including their mounting and operational characteristics. Separate manuals should be consulted for any other accessories used with these actuators.
667-4 Actuator Variations
The 667-4 actuator, available in sizes 70/70i and 87, is also discussed within this manual. This variation incorporates an integral air passage, which facilitates its use with a Fisher FIELDVUE instrument. This section outlines the specific installation and adjustment procedures for the 667-4 models. It also highlights any differences in maintenance when compared to the standard 667 actuator versions.
Installation Procedures
This section covers the critical steps for proper installation. It includes mounting the actuator onto the valve. Additionally, the correct bench set spring adjustment procedure is detailed for optimal performance.
Mounting the Actuator on the Valve
Before mounting the actuator, ensure the valve is properly prepared. Carefully align the actuator with the valve stem, ensuring correct orientation. Securely fasten the actuator to the valve using the appropriate hardware, referring to specific torque values in the manual. Confirm that all connections are tight and stable after mounting the actuator to guarantee optimal operation and prevent any leaks or damage during usage. Double-check the alignment.
Bench Set Spring Adjustment
Bench set refers to adjusting the actuator when it’s not connected to the valve. The goal is to ensure the actuator operates correctly within its designed pressure range. Begin by applying the lower pressure specified on the actuator’s nameplate and observe the stem movement. Mark the point where the stem first moves. Then, increase the pressure to the upper limit, which fully retracts the stem. Make adjustments, as needed, to achieve the proper travel range.
Maintenance and Repair
Proper maintenance is essential for the longevity of the actuator. This section covers disassembly, assembly, and proper parts ordering using kits. Always refer to the manual for specific procedures.
Disassembly and Assembly
Prior to disassembly, ensure the actuator is depressurized and isolated from the system. Carefully remove components, noting their positions for reassembly. The manual provides detailed steps and diagrams for the process. Lubricate parts as specified during reassembly. Special care should be taken with the diaphragm to avoid damage. Reassemble components in reverse order, ensuring all connections are secure, paying special attention to torque specifications for bolts.
Parts Ordering and Kits
Each Fisher 667 actuator has a unique serial number stamped on its nameplate. Always provide this number when ordering replacement parts or kits. The instruction manual includes lists of available parts and kits, including repair kits, diaphragms, and other components. Kits contain the necessary parts for specific maintenance procedures. Contact Fisher Controls or a local representative for assistance in identifying the correct parts and ordering.
Actuator Components
The Fisher 667 actuator consists of several key components, including the diaphragm, casing, and stem connector assembly. Handwheel options are also available for manual operation of the actuator. Proper maintenance is important.
Diaphragm and Casing
The diaphragm and casing are crucial components of the Fisher 667 actuator. The diaphragm, typically made of a flexible material, responds to pressure changes, enabling the actuator to move. The casing houses and protects the diaphragm, providing a secure structure. Over-tightening the diaphragm cap screws and nuts can damage the diaphragm; The diaphragm is typically made of nitrile.
Stem Connector Assembly
The stem connector assembly is a vital part of the Fisher 667 actuator, linking the actuator stem to the valve stem. This assembly ensures proper transfer of force and motion; It is important to check the contact diameter of the stem. Damage to threads on either the stem or in the stem connector can affect operation. The stem connector is typically made of zinc-plated steel.
Handwheel Options
The Fisher 667 actuator offers handwheel options for manual operation. These include top-mounted and side-mounted handwheels. The top-mounted handwheel is not designed for heavy load or frequent use. Side-mounted handwheels are available for various actuator sizes. The handwheel assembly allows manual adjustment of the valve position. Proper installation and lubrication are necessary for smooth operation. Handwheels provide a backup in case of pneumatic failure.
Additional Features
The Fisher 667 actuator includes features like travel stops for limiting movement. It is also compatible with FIELDVUE instruments, allowing for advanced control and diagnostics. These enhance the functionality.
Travel Stops
The Fisher 667 actuator incorporates casing-mounted travel stops. These stops are designed to limit the travel of the actuator stem. They are adjustable to provide precise control over the valve’s opening and closing positions. The travel stops prevent over-travel, protecting the actuator and the valve from damage. These are essential for accurate control and safety in various applications, ensuring the system operates within desired parameters and preventing potential issues during operation. The stops are a crucial feature.
Compatibility with FIELDVUE Instruments
The Fisher 667 actuator is designed for compatibility with Fisher FIELDVUE instruments. These instruments can be mounted using traditional bracket-based kits. The actuator can also be externally tubed for instruments or accessories when needed. This compatibility allows for advanced control and monitoring of the valve, enhancing performance and diagnostics. This integration provides improved control capabilities through digital communication and feedback from the instruments.
Technical Specifications
The Fisher 667 actuator specifications include thrust capabilities based on the input signal range. The effective diaphragm area varies by model size. Refer to the manual for specific values for each actuator size.
Thrust Capabilities
The thrust capabilities of the Fisher 667 actuator are dependent on the actuator size and the pressure range applied to the diaphragm. These capabilities are specified in tables within the instruction manual, detailing the force the actuator can exert at different input signal pressures. For the size 76 667 actuators, it’s recommended to contact an Emerson sales office or a local business partner for specific thrust information. Always consult the relevant instruction manuals for accurate and detailed thrust specifications.
Effective Diaphragm Area
The effective diaphragm area of the Fisher 667 actuator is a critical parameter that determines its force output. This area varies depending on the specific actuator size. The nominal effective diaphragm area is measured in both square centimeters and square inches. For instance, the 667NS2 model has different areas based on its size, with the size 45 having 677 cm², and size 80 having 2065 cm². These figures are essential for calculating the actuator’s performance characteristics.
Safety and Responsibility
Fisher does not assume responsibility for product selection, use, or maintenance. Proper selection, use, and maintenance of any Fisher product remains solely with the purchaser and end-user.
User Responsibilities
It is crucial for the user to understand that the responsibility for the correct selection, application, and upkeep of the Fisher 667 actuator lies entirely with them. This includes ensuring that the actuator is suitable for the intended process and that it is installed and maintained according to the instructions provided in the manual. The user must also be aware of all relevant safety precautions.