This is because smaller valves can regulate more precisely, take up less space and have lower pressure drops when open. By using c... cncontrolvalve.com KVS value: definition & calculation | A. Hock GmbH The KV-value of a valve describes the flow rate of liquid or gas at a pressure drop of one bar. This value is also called flow fac... A. Hock GmbH The Importance of Performance Ratings in Valves We should consult manufacturer's specifications and performance data, along with industry standards like ASME B16. 34 and API 6D t... Plumbing Supply And More 9 sites What is CV, and How Do I Calculate It? - Belimo Jun 30, 2021 —
Fisher valve sizing software, primarily known today as Fisher Specification Manager , is a professional tool designed to help engineers accurately select and size control valves for complex industrial processes. It replaces manual calculations with a streamlined, digital workflow to ensure safety and performance. Core Software Capabilities The software is built to handle the rigorous demands of flow control engineering, focusing on three main areas: Intelligent Sizing & Selection: Automated Calculations: It calculates the required Flow Coefficient ( Cvcap C sub v ) for liquid, gas, and steam applications based on user-provided process data like flow rate, pressure, and temperature. Operating Limit Alerts: The tool automatically flags potential issues such as cavitation , flashing , choked flow , and high velocity. Sequential Workflow: An intuitive, tabbed interface guides you through entering mechanical requirements and service conditions to narrow down valve models. Advanced Prediction Tools: Noise Prediction: It includes sophisticated algorithms to predict valve operating noise levels, helping engineers select noise-abatement trims like Whisper Trim™ when necessary. Cvcap C sub v Plotting: Users can instantly view Cvcap C sub v plots to visualize how a valve will perform across its entire travel range. Project Management & Data Export: ISA Specification Sheets: Quickly produces industry-standard ISA specification sheets for Fisher and Baumann valves. Dimensional Data: It provides dimensional drawings and data that can be exported to Excel or Word for use in piping design. Integration: Supports data exchange with plant engineering programs like Intergraph’s Smart Instrumentation (formerly INtools). Key Sizing Variables Needed To use the software effectively, you typically need to provide: Fluid Properties: Media type (water, oil, gas, etc.), density, and viscosity. Process Conditions: Upstream pressure ( P1cap P sub 1 ), downstream pressure ( P2cap P sub 2 ), and inlet temperature ( T1cap T sub 1 Physical Details: Required pipe size and desired pressure class. Availability Engineers can often access the latest version through the Emerson Fisher Specification Manager page or by contacting a local Emerson business partner. Fisher Specification Manager User Manual | PDF - Scribd
This is a deep technical report on Fisher Valve Sizing Software , primarily focusing on Fisher PROVISION (the modern standard) and its predecessor Fisher Sizing Program (FSP) , along with related tools. The report covers architecture, valve sizing theory (IEC/ISA standards), features, integration, use cases, limitations, and comparisons.
Deep Report: Fisher Valve Sizing Software 1. Executive Summary Fisher (Emerson Automation Solutions) provides industry-leading software for control valve sizing, noise prediction, and actuator selection. The primary tool is PROVISION , replacing the older Fisher Sizing Program (FSP) . PROVISION integrates valve sizing with Fisher’s catalog, selection logic, and Emerson’s broader engineering ecosystem (e.g., DeltaV, AMS Device Manager). It implements ISA-75.01.01 (IEC 60534-2-1) standards for incompressible, compressible, and two-phase flow, plus proprietary noise prediction models (e.g., for aerodynamic and hydrodynamic noise). 2. Core Software Portfolio | Software | Status | Primary Use | |----------|--------|--------------| | PROVISION | Current, actively supported | Complete sizing + selection + documentation | | Fisher Sizing Program (FSP) | Legacy (phased out) | Basic sizing, no longer updated | | Fisher Noise Prediction Program | Legacy | Standalone noise analysis | | Instrument Manager (IM) | Legacy | Actuator and accessory sizing | | AMS Device Manager | Current | Sizing integrated with asset management | Focus of this report: PROVISION (latest version v11+). 3. Theoretical Foundation – Valve Sizing Equations PROVISION strictly follows the IEC 60534-2-1:2011 and ISA-75.01.01 standards, with Emerson/Fisher extensions for special trims (e.g., Whisper, Cavitrol, NotchFlo). 3.1 Incompressible Flow (Liquid) [ Q = C_v \cdot \sqrt{\frac{\Delta P}{G_f}} ] fisher valve sizing software
(Q) = volumetric flow rate (gpm or m³/h) (C_v) = valve flow coefficient (\Delta P) = pressure drop (psi or bar) (G_f) = specific gravity
With pipe reducers: Uses (F_p) (piping geometry factor) per IEC. Cavitation check: Compares (\Delta P) with (\Delta P_{allow}) using (F_L) (liquid pressure recovery factor) and (P_v) (vapor pressure). 3.2 Compressible Flow (Gas/Vapor) [ Q = C_v \cdot \frac{N_9 \cdot P_1 \cdot Y}{\sqrt{G_g \cdot T_1}} \cdot \sqrt{x} ]
(x = \Delta P / P_1) (pressure drop ratio) (Y = 1 - x / (3 F_k x_T)) (expansion factor) (x_T) = terminal pressure drop ratio (valve-specific) (F_k = k / 1.4) (specific heat ratio factor) This is because smaller valves can regulate more
Choked flow condition: (x \geq F_k x_T) 3.3 Two-Phase Flow Uses homogeneous equilibrium model (HEM) with modified (\rho_m) and (C_v) correction. Fisher has proprietary enhancements for flashing and condensing applications. 3.4 Noise Prediction
Aerodynamic: Based on IEC 60534-8-3 with Fisher’s measured sound power levels for each trim type (e.g., Whisper trim reduces noise by 15–25 dBA). Hydrodynamic: Uses IEC 60534-8-4 plus Fisher empirical data for cavitation-induced noise. Outputs: dBA at 1m, dBC, and octave band data for piping wall transmission loss.
4. PROVISION Software Architecture 4.1 Input Workflow Hock GmbH The KV-value of a valve describes
Process data: Fluid properties (water, steam, hydrocarbons, custom), flow rate, inlet pressure, temperature, allowable pressure drop. Valve constraints: Line size, end connections, body material, pressure class. Performance targets: Desired (C_v), rangeability, noise limit (e.g., <85 dBA), cavitation margin.
4.2 Sizing Engine