Thermostatic Element: Temperature Range -20°C to 200°C

Component Specifications

Definition

A thermostatic element is a precision temperature-sensing device used in thermostatic steam traps, typically consisting of a sealed bellows or capsule filled with a volatile fluid or wax mixture. It operates based on thermal expansion principles to open or close the valve mechanism in response to condensate temperature variations, ensuring efficient steam system operation by discharging condensate while retaining live steam.

Working Principle

The thermostatic element operates on the principle of thermal expansion. When exposed to condensate at lower temperatures, the volatile fluid inside contracts, causing the bellows to collapse and open the valve for condensate discharge. As steam approaches, the temperature rises, expanding the fluid and extending the bellows to close the valve, preventing steam loss.

Materials

Stainless steel (AISI 304/316) bellows, copper-nickel alloy capsules, volatile fluid (typically alcohol-water mixture or specialized hydrocarbon), brass or stainless steel housing, PTFE seals.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Fluid Fill	Alcohol-based or synthetic hydrocarbon
Response Time	30-90 seconds
Bellows Stroke	3-8 mm
Temperature Range	-20°C to 200°C
Operating Pressure	0-25 bar

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 6552, ISO 6704, DIN EN 27841

Parent Products

This component is used in the following industrial products

Steam Trap

A device that automatically discharges condensate and non-condensable gases from steam systems while preventing steam loss.

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Engineering Analysis

Risks & Mitigation

Bellows rupture from overpressure
Fluid leakage causing loss of sensitivity
Corrosion from contaminated condensate
Thermal fatigue from rapid temperature cycling

FMEA Triads

Trigger: Cyclic thermal stress exceeding material endurance limits
Failure: Bellows fatigue cracking leading to fluid loss
Mitigation: Use bellows with higher cycle life ratings, implement pressure and temperature controls, regular inspection

Trigger: Chemical attack from acidic condensate or oxygen pitting
Failure: Corrosion penetration compromising seal integrity
Mitigation: Select corrosion-resistant materials (316 stainless steel), maintain proper water treatment, install filters

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2°C operating temperature tolerance, ±5% pressure rating tolerance

Test Method

ISO 6552 for steam trap testing, hydrostatic pressure testing per ASME B16.34, thermal response testing with calibrated temperature baths

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Thermostatic Element

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

SHANGHAI SMLG THERMOSTATIC TECHNOLOGY CO.,LTD

Shanghai, CN

Also makes: Pressure Relief Valve

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Wax thermostatic element”
View source page ↗ smlghvac.com · recorded 2026-09-13

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Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What causes thermostatic element failure in steam traps?

Common failures include bellows fatigue from cyclic operation, fluid leakage due to corrosion or seal degradation, contamination from system debris, and overheating beyond design limits.

How often should thermostatic elements be replaced?

Typical service life is 3-5 years under normal operating conditions, but replacement intervals depend on operating cycles, steam quality, and maintenance practices. Regular inspection is recommended annually.

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.

Thermostatic Element