Fisher Valve Model Numbers Explained: What Each Code Means
When purchasing surplus Fisher valves, understanding the coding behind Fisher valve model numbers explained: what each code means is essential for ensuring you acquire the right valve for your specific industrial application. With over 30 years of experience in the valve industry, I’m Sean Rupley from Industrial Surplus World, here to guide you through the intricate world of Fisher valve model numbers, helping you decode the model designations and make informed buying decisions.
Why Understanding Fisher Valve Model Numbers Matters
Fisher valves, manufactured by Emerson, are among the most widely used control valves in process industries — oil and gas, chemical, power generation, and pulp & paper, to name a few. These valves come in a broad array of configurations, sizes, materials, and trim options, often indicated by specific codes within the model number. For surplus valve buyers, deciphering these codes is critical to matching the valve’s capabilities with your process requirements.
Incorrect interpretation can lead to purchasing valves with incompatible pressure ratings, end connections, or materials of construction, which may result in costly downtime or safety hazards. Let’s break down the typical Fisher valve model number components so you can confidently identify the right valve.
How Fisher Valve Model Numbers Are Structured
Fisher valve model numbers typically consist of a base model number followed by suffixes or prefixes that indicate key features such as body style, trim design, pressure class, special materials, and actuator types. While the exact format varies by valve series, understanding general conventions applies across many Fisher valve products.
1. Base Model Number
The base model number identifies the primary valve design and size range. For example:
- Model 627 — A Fisher globe valve designed for control service, available in sizes from 1/2" to 12", with a pressure rating up to ANSI Class 600 (approx. 1480 psi @ 100°F).
- Model 667 — Fisher rotary plug valve, typically used for throttling in severe service applications.
- Model 1060 — A high-performance cage-guided globe valve, rated for ANSI Class 900 (approx. 2220 psi @ 100°F), often used in steam or high-pressure chemical service.
The base model provides a quick reference to the valve type, size range, and general pressure rating.
2. Trim and Body Material Codes
Following the base model, codes often specify the trim and body materials. Common materials include:
- Body Materials: Carbon steel (A216 WCB), stainless steel (A351 CF8M), duplex stainless steel (A890 4A), or exotic alloys like Hastelloy or Monel.
- Trim Materials: Stainless steel 316, hardened stainless steel, Stellite®-coated trims for wear resistance, or special alloys for corrosion resistance.
For example, a suffix like -SS might indicate stainless steel body and trim, while -HC could indicate hardened chrome-plated trim for abrasive service.
3. Pressure Class and End Connections
The model number will often include pressure class designations conforming to ANSI/ASME standards:
- 150, 300, 600, 900, 1500, 2500 — Corresponds to the pressure-temperature rating of the valve body and bonnet, e.g., Class 600 is rated for about 1480 psi at 100°F.
End connections might be indicated as:
- RF — Raised face flanged ends
- BW — Butt weld ends
- SW — Socket weld ends
- THD — Threaded ends
4. Actuator and Accessory Codes
Fisher valves frequently come with pneumatic or electric actuators, positioners, and limit switches. These are often included as part of the model number or as separate catalog numbers. For example:
- Type 358 — A common Fisher pneumatic diaphragm actuator.
- Type 373 — An electro-pneumatic positioner used for modulating control.
Understanding these codes helps you verify if the valve you’re buying comes with the correct actuator or if a retrofit is necessary.
Detailed Example: Decoding a Fisher Valve Model Number
Let’s analyze a hypothetical model number:
627-102A-C6H-BDN-SS-600-RF
- 627: Base model number indicating a globe control valve.
- 102A: Indicates trim design number 102A, which could mean a balanced cage trim rated for high pressure drop applications.
- C6H: Material code, where “C6H” often refers to a chromium-molybdenum steel alloy suitable for elevated temperature service.
- BDN: Body design or bonnet code, possibly indicating a bolted bonnet with a specific packing style.
- SS: Stainless steel trim and/or body components.
- 600: ANSI class 600 pressure rating.
- RF: Raised face flange ends.
By understanding each segment, buyers can confirm the valve’s suitability regarding pressure, temperature, material compatibility, and connection type.
Industry Standards and Specifications in Fisher Valve Codes
Fisher valves comply with stringent industry standards, which are often referenced in the model number or accompanying documentation:
- API 598: Valve inspection and testing.
- ANSI/ASME B16.34: Valve pressure-temperature ratings, materials, and dimensions.
- ISO 15848: Fugitive emissions requirements for valve packing.
When buying surplus Fisher valves, ensure the valve’s specs match or exceed your process requirements. For example, a valve rated Class 600 per ANSI B16.34 will handle approximately 1480 psi at 100°F, but pressure rating decreases as temperature increases.
Tips for Buying Surplus Fisher Valves Based on Model Numbers
As a surplus valve buyer, consider the following practical advice:
- Request the Full Model Number & Documentation: Always ask for the complete model number with suffixes and prefixes, along with datasheets or original manufacturer documentation.
- Verify Pressure and Temperature Ratings: Cross-check the pressure class and material codes with your process conditions, including maximum temperature and corrosive media.
- Check Trim and Seating Materials: For abrasive or erosive services, trims with hardened coatings (e.g., Stellite®) are essential for longevity.
- Confirm End Connections: Flanged, welded, or threaded ends must match your piping system to avoid costly modifications.
- Actuator Compatibility: If the valve is part of a control loop, verify actuator and positioner types for compatibility with your control system.
- Look for OEM Part Numbers: These can help you cross-reference and confirm genuine Fisher valve parts and assemblies.
Common Fisher Valve Models and Their Typical Applications
| Model | Valve Type | Size Range | Pressure Class | Typical Applications |
|---|---|---|---|---|
| 627 | Globe Control Valve | 1/2" to 12" | 150 to 600 | General purpose process control, steam, gas, liquids |
| 667 | Rotary Plug Valve | 1" to 8" | 150 to 300 | Severe service throttling, slurry |
| 1060 | High Performance Cage-Guided Globe Valve | 2" to 10" | 300 to 900 | High pressure steam, chemical processing |
How to Use Model Numbers to Evaluate Surplus Inventory
When reviewing surplus Fisher valves, use the model numbers to create a checklist:
- Confirm Size: Match valve size with your piping.
- Confirm Pressure Rating: Ensure pressure ratings meet or exceed your system conditions.
- Confirm Materials: Verify body and trim materials for corrosion and temperature compatibility.
- Verify Actuator/Accessories: Check if actuators or positioners are included, their condition, and compatibility.
- Review Testing & Certification: Ask if the valve has been tested per API 598 or other standards.
Additional Resources
For a detailed look at Fisher valve standards and product information, Emerson’s official site is the authoritative source: Emerson Fisher Valve Product Information.
Also, for industry standards and latest best practices, refer to the American Petroleum Institute (API).
Frequently Asked Questions (FAQs)
- How can I identify the pressure rating from a Fisher valve model number?
The pressure rating is often indicated by an ANSI class number (e.g., 150, 300, 600) included as a suffix or in the valve’s specification sheet. This corresponds to pressure-temperature limits defined in ANSI/ASME B16.34. Confirm with the datasheet to ensure correct application. - What does the trim code in a Fisher valve model number signify?
The trim code specifies the internal components such as plug, seat, stem, and guides. It defines the valve’s flow characteristics, wear resistance, and suitability for certain media. For instance, trim design 102A often indicates a balanced cage design ideal for high-pressure drops. - Are actuator types included in the model number?
Sometimes actuator and positioner types are appended to the valve model number or listed separately. Knowing which actuator came with the valve is crucial for control system integration and maintenance. - How do I ensure the surplus valve matches my system’s material requirements?
Verify the material codes in the model number and compare them to your process media and temperature. For example, stainless steel trim (SS) may be necessary for corrosive environments, while carbon steel may suffice for non-corrosive fluids. - Can I use a surplus valve without testing?
It is not advisable. Even surplus valves should be inspected and tested according to API 598 or equivalent standards before installation. Request test certificates from the seller or arrange for third-party testing if necessary.
Conclusion: Mastering Fisher Valve Model Numbers for Surplus Purchases
Understanding Fisher valve model numbers explained: what each code means empowers buyers to select the right surplus valves with confidence, reducing risks and ensuring operational reliability. By carefully analyzing base models, trim codes, pressure ratings, materials, and actuator types, you can effectively match surplus inventory to your