Rosemount
Gauge Pressure
Differential Pressure
Absolute Pressure
Rosemount Level Transmitter
Yokogawa
ABB
E+H
HoneyWell
Micro Motion Coriolis
Rosemount
Yokogawa
E+H
Valves&Actuators
Description
Fisher CAV III Micro-Flat Trim
If you’re dealing with clean liquid cavitation and the flow is small but the pressure drop is brutal, this trim is usually the “right tool” instead of fighting repeated trim damage. Fisher CAV III Micro-Flat combines Cavitrol™ III style cavitation control with Micro-Flat low-flow capability, aimed at stable throttling in very low Cv ranges for severe liquid letdown duties.
Key Features
•Built for clean, cavitating liquid service where cavitation is the real enemy.
•Low-flow focused trim design (Micro-Flat concept added to CAV III).
•Common configuration window includes NPS 1 / 1-1/2 / 2 (easy to match on many globe/angle platforms).
•Class IV / Class V shutoff options (FCI 70-2), depending on final configuration.
•Supports compliance needs often requested by projects (e.g., NACE, PED/CRN, ATEX, SIL capable—as applicable).
Specifications
| Specifications | Details |
|---|---|
| Product | Fisher™ CAV III Micro-Flat Trim |
| Critical Service | Cavitation; Low Flow |
| Flow Characteristics | Linear |
| Materials | Carbon Steel; Stainless |
| Operating Temperature | Standard Temperature |
| Pressure Class | ASME |
| Process Connection Type | Flanged; Butt Weld; RTJ; Threaded; Socket Weld |
| Shutoff Class | Class IV (FCI 70-2); Class V (FCI 70-2) |
| Valve Size | NPS 1; NPS 1-1/2; NPS 2 |
| Certifications (as applicable) | SIL capable; ATEX; CUTR; PED; CRN; NACE |
Selection Guide
This is the fastest way to avoid mismatching a “trim” order (especially when resellers receive partial valve info):
•Confirm the valve platform/series you’re fitting it to (globe/angle family).
•Provide service is liquid + clean, and the key numbers: ΔP + flow/Cv range + temperature.
•If your minimum required Cv is very small, note it—Micro-Flat trims are selected specifically for low-Cv staging.
Applications
Typical buyers pick this trim when they’re trying to solve one of these headaches:
•Severe liquid letdown with cavitation noise/erosion risk.
•Very low flow control where standard trims feel “too jumpy” or wear out quickly.
•Retrofits where the site wants a practical fix without redesigning the whole station. (We confirm compatibility first.)
Project Support
If you’re buying for a project or re-selling, we can help you keep it simple:
•Compatibility check (trim vs valve family/size) before you pay.
•Document support depending on what your customer needs (COC/MTC, compliance notes, packing list).
•Trade-friendly packing & photo confirmation (nameplate/parts/packing) to reduce disputes on arrival.
【Before We Ship】
Before we ship, we’ll confirm these 3 items with you:
•ID / configuration (photo)
•Size / class / materials (match your PO or datasheet notes)
•Packing list + real photos (so your buyer receives exactly what was ordered)
FAQ
Q1: Is this a full valve or trim only?
A: This page is for the trim. If you need the complete valve (body/bonnet/actuator), tell us and we’ll quote the full scope.
Q2: Can it be used for gas service?
A: Micro-Flat cavitation trims are intended for liquid cavitation control; not intended for gas service in that context.
Q3: What do you need to quote quickly?
A: Valve family + NPS size + ΔP + flow/Cv + temperature + qty (that’s enough to start).
Contact CTA
Send valve family/series + NPS size + inlet/outlet P (or ΔP) + flow/Cv range + temperature + qty, and we’ll reply with a confirmed match, best price option, and lead time—no back-and-forth.
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