Fill Opening/Cap: Temperature Range -20°C to 80°C

Component Specifications

Definition

A precision-engineered component consisting of an opening integrated into a water tank structure and a matching cap that provides a secure, leak-proof seal. It enables controlled filling operations while preventing contamination, evaporation, and spillage. The assembly typically includes threads, gaskets, or locking mechanisms to ensure reliable closure under operational pressures and environmental conditions.

Working Principle

The fill opening provides a designated access point for introducing water into the tank. The cap creates a mechanical seal through compression of a gasket or O-ring against a mating surface when tightened or locked. This seal prevents fluid escape and external contamination. Some designs incorporate venting features to allow air displacement during filling or thermal expansion.

Materials

Common materials include: Stainless Steel (AISI 304/316 for corrosion resistance), Polypropylene (PP) or Polyethylene (PE) for chemical inertness, NBR or EPDM gaskets for sealing. Material selection depends on water quality (potable/industrial), temperature range (-20°C to 80°C typical), and pressure requirements (0-5 bar typical).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Seal Type	NBR O-ring
Thread Size	2" NPT standard
Material Grade	AISI 304 Stainless Steel
Pressure Rating	5 bar maximum
Opening Diameter	50 mm
Temperature Range	-20°C to 80°C

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 1179-1, DIN 11851

Parent Products

This component is used in the following industrial products

Water Tank

The water tank is a reservoir component within a humidifier that holds the water supply.

View Product Details

Engineering Analysis

Risks & Mitigation

Contamination ingress
Leakage due to improper sealing
Thread damage during installation
Venting failure causing vacuum or pressure buildup

FMEA Triads

Trigger: Incorrect torque application during cap installation
Failure: Incomplete seal leading to leakage
Mitigation: Use calibrated torque wrenches and implement torque verification procedures

Trigger: Gasket degradation from chemical exposure or aging
Failure: Seal failure and fluid loss
Mitigation: Regular preventive maintenance with gasket replacement schedules and material compatibility verification

Trigger: Cross-threading during cap installation
Failure: Thread damage preventing proper sealing
Mitigation: Implement visual alignment checks and use self-aligning cap designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on critical sealing surfaces, thread pitch tolerance per ISO 228-1

Test Method

Pressure decay test per ISO 15848, helium leak test for high-integrity applications

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.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Fill Opening/Cap

Manufacturer profiles associated with Fill Opening/Cap.

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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 are the main differences between threaded and quick-connect fill caps?

Threaded caps provide higher pressure sealing and vibration resistance through mechanical compression, while quick-connect caps offer faster operation with bayonet or cam-lock mechanisms but typically have lower pressure ratings.

How often should fill opening gaskets be replaced?

Gaskets should be inspected quarterly and replaced annually under normal conditions, or immediately if visible wear, cracking, or compression set is observed. More frequent replacement is needed in high-cycle or aggressive chemical environments.

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.

Fill Opening/Cap