Orifice: Temperature Range -40°C to 150°C, L/D Ratio 0.5-2.0

Component Specifications

Definition

A precisely engineered orifice is a critical component in thermal expansion valves (TXVs) that creates a controlled pressure drop to regulate refrigerant flow into the evaporator. This calibrated restriction converts high-pressure liquid refrigerant to low-pressure liquid-vapor mixture through adiabatic expansion, enabling precise metering of refrigerant based on evaporator superheat signals.

Working Principle

The orifice operates on the principle of controlled flow restriction where refrigerant passes through a precisely sized opening, creating a pressure differential. This causes flash evaporation as high-pressure liquid refrigerant expands to lower pressure, with flow rate determined by orifice diameter, upstream pressure, and refrigerant properties according to Bernoulli's principle and continuity equations.

Materials

Stainless steel (AISI 304/316), brass (C36000/C37700), or specialized alloys with corrosion resistance to refrigerants; hardness: 150-250 HB; surface finish: Ra 0.4-0.8 μm

Technical Parameters

Parameter	Typical range	Notes & selection driver
L/D Ratio	0.5-2.0
Tolerance	±0.01 mm
Pressure Rating	Up to 5000 kPa
Orifice Diameter	0.5-3.0 mm
Temperature Range	-40°C to 150°C
Flow Coefficient (Cv)	0.001-0.05

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

Standards

ISO 5167, ASME B16.36, DIN 1952

Parent Products

This component is used in the following industrial products

Expansion Valve

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

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Nozzle

A precision component of a cutting torch that directs and shapes the flow of fuel-oxygen mixture for controlled metal cutting.

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Engineering Analysis

Risks & Mitigation

Erosion from high-velocity refrigerant flow
Clogging from system contaminants
Corrosion from moisture or incompatible refrigerants
Improper sizing leading to system inefficiency

FMEA Triads

Trigger: Abrasive particles in refrigerant
Failure: Gradual enlargement of orifice diameter
Mitigation: Install high-efficiency filter-driers, maintain proper refrigerant purity, use erosion-resistant materials

Trigger: Moisture contamination
Failure: Corrosion and ice formation at orifice
Mitigation: Ensure proper system dehydration, use desiccants, maintain moisture levels below 50 ppm

Trigger: Improper installation alignment
Failure: Turbulent flow and uneven wear
Mitigation: Follow manufacturer alignment procedures, use proper gaskets/seals, verify perpendicular installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter tolerance: ±0.01 mm, Circularity: within 0.005 mm, Surface roughness: Ra 0.4-0.8 μm

Test Method

Flow calibration using ASHRAE 41.9 standards, dimensional verification with coordinate measuring machines (CMM), pressure testing per ISO 5208

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Orifice

Manufacturer profiles associated with Orifice.

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Frequently Asked Questions

What is the primary function of an orifice in an expansion valve?

The orifice creates a controlled pressure drop that meters refrigerant flow into the evaporator, converting high-pressure liquid to low-pressure liquid-vapor mixture for efficient heat absorption.

How does orifice size affect system performance?

Orifice diameter directly determines refrigerant flow rate. Undersized orifices cause insufficient cooling and high superheat, while oversized orifices lead to flooding, reduced efficiency, and potential compressor damage.

What maintenance is required for orifice components?

Regular inspection for erosion, corrosion, or clogging from contaminants. Replacement is recommended if diameter changes exceed 5% or if visible damage affects flow characteristics.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Orifice