Structured Manufacturing Data (2026)

Expansion Valve

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Expansion Valve used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Expansion Valve is characterized by the integration of Valve Body and Orifice. In industrial production environments, manufacturers listed on CNFX commonly emphasize Brass construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A refrigerant flow control device that regulates the amount of liquid refrigerant entering the evaporator.

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Product Specifications

Technical details and manufacturing context for Expansion Valve

Definition
The expansion valve is a critical component in vapor-compression refrigeration systems that meters the flow of high-pressure liquid refrigerant from the condenser into the low-pressure evaporator. It creates a pressure drop that causes the refrigerant to expand and partially vaporize, facilitating efficient heat absorption in the evaporator.
Working Principle
The expansion valve operates by maintaining a constant superheat at the evaporator outlet. It senses pressure and temperature at the evaporator exit and modulates the valve opening to control refrigerant flow, ensuring optimal evaporator performance and preventing liquid refrigerant from returning to the compressor.
Common Materials
Brass, Stainless Steel, Copper
Technical Parameters
  • Valve orifice diameter, typically ranging from 0.5mm to 3.0mm depending on system capacity (mm) Standard Spec
Components / BOM
  • Valve Body
    Main housing containing the orifice and connection ports
    Material: Brass or Stainless Steel
  • Orifice Part
    Precision opening that meters refrigerant flow
    Material: Stainless Steel
  • Thermal Bulb Part
    Senses evaporator outlet temperature for superheat control
    Material: Copper
  • Diaphragm Part
    Flexible membrane that responds to pressure changes to modulate valve opening
    Material: Stainless Steel or Special Alloy
  • Spring Part
    Provides counterforce to maintain proper superheat setting
    Material: Spring Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Expansion Valve.

brass expansion valve for industrial refrigeration stainless steel refrigerant flow control device copper thermal expansion valve BOM industrial machinery evaporator control valve diaphragm orifice spring thermal bulb valve

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Refrigeration System
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Chiller Unit
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Climate Control System
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Refrigeration Unit
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Industrial Chiller
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HVAC Systems
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 500 psi (34.5 bar)
flow rate: 0.5 to 100 lb/hr (0.23 to 45.4 kg/hr)
temperature: -40°C to 120°C
slurry concentration: Not applicable - designed for clean refrigerant systems only
Media Compatibility
✓ R-410A refrigerant ✓ R-134a refrigerant ✓ R-32 refrigerant
Unsuitable: Systems with particulate contamination or abrasive slurries
Sizing Data Required
  • Evaporator cooling capacity (tons or kW)
  • Refrigerant type and properties
  • Design pressure drop across valve (psi or bar)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Valve seat wear and leakage
Cause: Contaminants in refrigerant flow (particles, debris) causing abrasive erosion of sealing surfaces, improper valve sizing leading to excessive pressure differentials, or material incompatibility with refrigerant/oil
Thermal expansion element failure
Cause: Loss of charge in thermal bulb due to mechanical damage or seal failure, incorrect bulb positioning/insulation affecting temperature sensing, or exposure to extreme ambient temperatures beyond design limits
Maintenance Indicators
  • Abnormal hissing or whistling sounds during operation indicating refrigerant leakage past valve seat
  • Frost formation on valve body or downstream piping suggesting improper refrigerant flow or valve malfunction
Engineering Tips
  • Install high-efficiency filter-driers upstream and maintain strict refrigerant cleanliness protocols to prevent contaminant-induced wear
  • Implement regular calibration checks of thermal bulbs using temperature baths and ensure proper mounting/insulation per manufacturer specifications

Compliance & Manufacturing Standards

Reference Standards
ISO 5149:2014 (Refrigerants and refrigerant systems) ANSI/ASHRAE 15-2019 (Safety Standard for Refrigeration Systems) EN 378:2016 (Refrigerating systems and heat pumps - Safety and environmental requirements)
Manufacturing Precision
  • Orifice diameter: +/-0.01mm
  • Body flatness: 0.05mm across sealing surface
Quality Inspection
  • Helium leak test (pressure decay method)
  • Flow capacity verification test

Factories Producing Expansion Valve

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of an expansion valve in refrigeration systems?

The expansion valve regulates the flow of liquid refrigerant into the evaporator, controlling pressure and temperature to ensure efficient cooling in industrial machinery.

Which materials are commonly used in industrial expansion valves and why?

Brass, stainless steel, and copper are standard for their corrosion resistance, durability, and thermal conductivity, making them ideal for harsh industrial environments.

How do the BOM components like diaphragm and thermal bulb work together?

The thermal bulb senses evaporator temperature, signaling the diaphragm to adjust the orifice opening via the spring, creating a precise feedback loop for refrigerant flow control.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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