Overview of Fisher 667 Actuator
The Fisher 667 is a spring-opposed diaphragm actuator designed for use with control valves. It is reverse-acting, meaning it extends the valve stem upon a decrease in pneumatic pressure. This model is available in sizes ranging from 30 to 87. It positions valve plugs using varying pneumatic output signals.
The Fisher 667 actuator is a critical component in many industrial control systems, particularly those involving fluid or gas regulation. This diaphragm actuator, known for its reliability and precision, is designed to translate pneumatic signals into mechanical motion, effectively positioning valve plugs within control valves. It is a reverse-acting actuator, meaning the valve stem extends as the control pressure decreases, a feature that differs from its direct-acting counterpart, the Fisher 657. This characteristic makes the 667 suitable for specific control applications where a fail-open valve position is required upon loss of signal pressure. The actuator is available in multiple sizes, each tailored to accommodate different valve sizes and thrust requirements. This manual offers detailed guidance for the installation, operation, and maintenance of Fisher 667 actuators, covering sizes 30 through 76 and size 87, including the 667-4 configuration for sizes 70 and 87. Its spring-opposed design is responsive to varying controller or valve positioner pneumatic outputs.
Fisher 667 Actuator Specifications
The Fisher 667 actuator is available in various sizes, each with specific dimensions and pressure limitations. These specifications are vital for proper selection and safe operation. Consult the product manuals for detailed sizing information and maximum pressure ratings.
Sizes and Dimensions
The Fisher 667 actuator is manufactured in a range of sizes to accommodate various valve requirements. These sizes typically span from size 30 through size 76, and also include a larger size 87. Each size has specific dimensions that are critical for proper installation and function. These dimensions include the actuator’s overall height, diameter, and the mounting bolt pattern. The specific dimensions for each size are detailed in the Fisher 667 instruction manual, which should be consulted before installation. Correctly matching the actuator size to the valve and the application is essential to ensure optimal performance and safety. Understanding these dimensional aspects ensures proper fit and alignment during mounting procedures. Furthermore, knowing the exact physical sizes helps in planning the installation environment and accommodating space constraints. The manual offers precise measurements for every size, enabling engineers to select the most suitable actuator for their specific requirements. It is important to refer to the official documentation for exact figures, as deviations can lead to operational issues or damage.
Pressure Limitations
The Fisher 667 actuator has specific pressure limitations that must be adhered to for safe and efficient operation. These limitations are defined in the instruction manual and typically include maximum allowable supply pressure and output pressure ranges. Exceeding these limits can result in damage to the actuator and may lead to system failure. The actuator’s performance is directly tied to the pneumatic supply pressure, which should be within the specified operating window. It is crucial to verify the pressure ratings before installation and operation to ensure compatibility with the system. The pressure limitations are influenced by the actuator size and model, with variations depending on the specific configuration. Consulting the appropriate manual is essential for identifying the correct pressure limits. Maintaining the correct pressure ensures accurate valve positioning and avoids premature wear or failure. Failure to adhere to these pressure limits can pose significant safety risks. Therefore, a thorough understanding of the pressure specifications is vital for anyone working with or maintaining the Fisher 667.
Installation of Fisher 667 Actuator
Proper installation of the Fisher 667 actuator is crucial for optimal performance. This involves correctly mounting the actuator to the valve and setting up the pneumatic connections, according to the detailed instructions within the manual.
Mounting Instructions
When mounting the Fisher 667 actuator, it is essential to follow specific guidelines to ensure proper functionality and safety. First, verify the compatibility of the actuator size with the valve body it will be attached to. Securely fasten the actuator to the valve using appropriate bolts and washers, ensuring they are tightened to the torque specifications outlined in the instruction manual. The orientation of the actuator must be correct, considering the specific application requirements. Ensure all connections are properly aligned before tightening all mounting hardware. Pay close attention to the alignment of the stem and yoke. Incorrect mounting can lead to issues like reduced valve performance and potential damage to the actuator. Refer to the manual’s diagrams for visual guidance. It’s also important to use the correct tools and wear protective gear during the mounting process to prevent any accidents.
Setup Procedures
After properly mounting the Fisher 667 actuator, the next crucial step involves setting it up correctly. Begin by connecting the pneumatic supply line to the actuator, ensuring the pressure is within the specified range detailed in the manual. Next, adjust the spring preload to achieve the desired valve position at zero signal. This often involves adjusting the spring adjuster. Double-check all connections for any leaks before proceeding. If a positioner is used, it must be calibrated in accordance with its own instruction manual to ensure it accurately responds to control signals. The setup process should be done carefully, and all adjustments must be within the defined limits to prevent damage. A proper setup is essential for the actuator to perform its control functions efficiently and reliably. Test the valve’s response to varying signals after setup.
Maintenance of Fisher 667 Actuator
Regular maintenance is crucial for the Fisher 667 actuator’s reliable operation. This includes periodic checks for leaks, proper adjustment of components, and timely replacement of worn parts. Following guidelines helps maintain optimal performance.
Adjustment Guidelines
Proper adjustment of the Fisher 667 actuator is essential for ensuring accurate valve positioning and optimal control performance. The adjustment process typically involves setting the actuator’s spring range and travel to match the requirements of the connected valve. This often requires careful manipulation of the adjusting screw or other designated components, following the specific instructions outlined in the relevant manual. Incorrect adjustments may lead to issues such as valve instability, reduced flow control, or even damage to the actuator or valve assembly. It’s important to use the correct tools and methods, as specified in the Fisher 667 instruction manual, to avoid any potential harm or miscalibration. Always refer to the specific manual for detailed adjustment procedures and torque specifications to ensure proper and safe operation. Regularly verify the settings to maintain accurate control performance over time. Any variations from the recommended settings should be corrected immediately by a qualified technician. Regular checks and adjustments are key to the longevity and accuracy of your control system.
Parts Ordering Information
When ordering replacement parts for the Fisher 667 actuator, it’s crucial to reference the correct part numbers as detailed in the official instruction manual. This manual provides comprehensive exploded views and parts lists that are specific to each size and configuration of the actuator. To ensure you receive the correct components, always include the actuator’s specific size and any relevant series or revision numbers in your order. Common parts that may need replacement include diaphragms, springs, O-rings, and fasteners. It is recommended to use only genuine Fisher parts to maintain the integrity and performance of the actuator. These can typically be ordered through authorized Fisher distributors or directly from the manufacturer. When placing an order, provide as much detail as possible, including the specific part number, quantity required, and any other identifying information. This detailed approach ensures correct part delivery and reduces any downtime.
Fisher 667 vs Fisher 657
The Fisher 667 actuator is reverse-acting, while the Fisher 657 is direct-acting. This is a key functional difference in their operational behavior. Understanding this distinction is crucial for proper system implementation and functionality.
Key Differences
The primary distinction between the Fisher 667 and 657 actuators lies in their operational action. The 667 is a reverse-acting actuator, which means that the valve stem extends when the pneumatic pressure decreases. Conversely, the 657 is a direct-acting actuator, where the valve stem extends when the pneumatic pressure increases. This fundamental difference in how they respond to pressure changes dictates their suitability for specific control applications. Furthermore, the spring action within each actuator is configured differently to achieve these opposing responses. When choosing an actuator, it is crucial to consider whether a fail-open or fail-closed action is required for the valve. The 667 is generally used in applications where a loss of pressure should result in valve closure, while the 657 is used when a loss of pressure should result in valve opening. Consult detailed instruction manuals for further differences and specifications. The specific application will determine which actuator should be used.