Adjustment Cap: Temperature Range -40°C to 200°C, Weight 85g

Component Specifications

Definition

A precision-engineered threaded cap component used in pressure relief devices to provide controlled access for adjusting the set pressure, performing maintenance, and sealing the adjustment mechanism from environmental contaminants. It typically features a tamper-evident design and incorporates sealing elements to maintain system integrity.

Working Principle

The adjustment cap functions as a protective and operational interface for the pressure adjustment mechanism. When rotated, it engages with internal threads to either compress or release the spring tension in the relief valve, thereby changing the set pressure at which the device activates. Its sealing surfaces prevent fluid leakage and contamination ingress while maintaining the calibrated pressure setting.

Materials

Stainless Steel 316L (ASTM A276), Buna-N rubber seals (ASTM D2000), optional PTFE coating for chemical resistance

Technical Parameters

Parameter	Typical range	Notes & selection driver
Finish	Passivated per ASTM A967
Weight	85g
Seal Type	O-ring (AS568-214)
Thread Size	M20x1.5
Temperature Range	-40°C to 200°C
Torque Specification	25-30 Nm
Operating Pressure Range	0-1000 psi

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 4126-1, ASME BPVC Section VIII, DIN 3320, API 526

Parent Products

This component is used in the following industrial products

Pressure Relief Device

A safety component that automatically releases excess pressure from a closed system to prevent equipment failure or rupture.

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Engineering Analysis

Risks & Mitigation

Improper adjustment leading to overpressure conditions
Cross-threading during installation
Seal failure causing system contamination
Unauthorized tampering with pressure settings

FMEA Triads

Trigger: Corrosion from chemical exposure
Failure: Thread seizure preventing adjustment
Mitigation: Use corrosion-resistant materials and protective coatings

Trigger: Overtorquing during installation
Failure: Thread stripping or seal deformation
Mitigation: Implement torque-controlled installation procedures

Trigger: Material fatigue from cyclic loading
Failure: Crack propagation leading to catastrophic failure
Mitigation: Regular inspection and replacement per maintenance schedule

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm thread pitch diameter, ±0.1mm sealing surface flatness

Test Method

Helium leak test per ASTM E499, pressure decay test at 1.5x working pressure, torque verification per ISO 16047

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 Adjustment Cap

Manufacturer profiles associated with Adjustment 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

How often should adjustment caps be inspected?

Adjustment caps should be visually inspected during routine maintenance cycles (typically every 6-12 months) and replaced if signs of corrosion, thread damage, or seal degradation are observed.

Can adjustment caps be reused after removal?

Yes, if undamaged and seals are replaced. However, torque values must be verified upon reinstallation to ensure proper sealing and pressure setting retention.

What causes adjustment cap leakage?

Common causes include damaged O-rings, cross-threading during installation, insufficient torque, corrosion on sealing surfaces, or thermal cycling effects on seal materials.

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.

Adjustment Cap