Steam Generator Feedwater Control Valve Trim

Product Specifications

Technical details and manufacturing context for Steam Generator Feedwater Control Valve Trim

Definition

This product is a feedwater control valve trim, a precision flow control assembly installed within feedwater control valves used in industrial steam generators. The trim regulates the flow of treated water into the boiler to maintain optimal water levels and prevent dry firing, thereby supporting stable steam pressure and temperature. It responds to control signals from the boiler management system by modulating the flow area through a precisely machined plug and seat arrangement. Manufacturers supply these components to valve assembly plants and boiler OEMs as essential replacement parts for maintenance operations.

The trim is available in materials such as Stainless Steel 316, Stellite 6, and Inconel 625, selected for corrosion and erosion resistance. Key parameters include a flow coefficient (Cv) of 15–60 at full open, pressure ratings of PN16–PN40, temperature ratings of -10 to 200 °C, and valve sizes DN25–DN100 per ISO 6708. Leakage class ranges from IV to VI per IEC 60534-4, and flow characteristics include linear to equal percentage. Stroke length is 10–50 mm, seat material hardness is 40–60 HRC per ASTM E18, stem diameter is 12–30 mm, trim material is SS316–SS316L per ASTM A276, and weight is 5–20 kg.

These values are reference ranges; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. The trim is a component, not a standalone valve, and its performance depends on proper selection, installation, and maintenance. Verification questions should address compatibility with the valve body, actuator, and process conditions. Maintenance signals include leakage, erratic flow, or excessive wear. Failure boundaries include exceeding pressure/temperature limits or using incompatible materials.

Working Principle

The trim operates by modulating the flow area between a plug and seat. The actuator positions the plug relative to the seat, changing the orifice size and thus the feedwater flow rate. The plug and seat are precisely machined to achieve a desired flow characteristic (linear or equal percentage) and to provide tight shutoff (leakage class IV–VI). The flow coefficient (Cv) indicates the flow capacity at full open. The trim responds to control signals from the boiler management system, which monitors water level and adjusts the actuator to maintain the setpoint. Materials like Stellite 6 and Inconel 625 provide erosion and corrosion resistance in high-pressure, high-temperature feedwater environments.

Common Materials

Stainless Steel 316, Stellite 6, Inconel 625

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow CoefficientRequired	15–60 Cv	Standard flow coefficient at full open position
Pressure RatingRequired	PN16–PN40 bar	Maximum allowable working pressureISO 5208
Temperature RatingRequired	-10–200 °C	Maximum continuous operating temperature
Valve SizeRequired	DN25–DN100 inches	Nominal pipe size compatibilityISO 6708
Leakage Class	IV–VI ANSI/FCI	Seat leakage classification per standardsIEC 60534-4
Flow Characteristic	Linear–Equal% type	Inherent flow characteristic (equal percentage, linear, quick opening)
Stroke Length	10–50 mm	Determines actuator travel and response time.
Seat Material Hardness	40–60 HRC	Higher hardness for erosion resistance.ASTM E18
Stem Diameter	12–30 mm	Must withstand actuation forces without buckling.
Trim Material	SS316–SS316L	SS316L for corrosive feedwater environments.ASTM A276
Weight	5–20 kg	Affects handling and installation requirements.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Plug
Primary flow modulating element

Material: Stainless Steel 316 with Stellite facing
Valve Seat Part
Stationary sealing surface for plug interface

Material: Stellite 6 alloy
Stem Connection Part
Interface between trim and actuator stem

Material: Stainless Steel 316
Cage Guide Optional Part
Provides plug guidance and flow shaping

Material: Stainless Steel 316

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Steam Generator Feedwater Control Valve Trim.

Manufacturers of Steam Generator Feedwater Control Valve Trim

Manufacturer profiles associated with Steam Generator Feedwater Control Valve Trim.

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Frequently Asked Questions

What is the function of a feedwater control valve trim?

The trim regulates the flow of feedwater into the boiler to maintain proper water level and prevent dry firing, ensuring stable steam generation.

What materials are available for this trim?

Available materials include Stainless Steel 316, Stellite 6, and Inconel 625, chosen for corrosion and erosion resistance.

What are the typical pressure and temperature ratings?

Pressure ratings are PN16–PN40, and temperature ratings are -10 to 200 °C. These are reference ranges; confirm with the manufacturer.

How do I verify the correct trim for my application?

Check the valve size, flow coefficient, pressure class, temperature range, and material compatibility with your process fluid. Always consult the legal manufacturer or supplier for model-specific data.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 250 bar (3625 psi)
flow rate:	0.1 to 500 m³/h (0.44 to 2200 gpm)
temperature:	0°C to 400°C (32°F to 752°F)
slurry concentration:	Not recommended for slurries above 5% solids by weight