Adjustment Screw/Cap: Torque Range 5-50 Nm

Component Specifications

Definition

A precision mechanical component used in relief valves to manually adjust the set pressure at which the valve opens to release excess pressure from a system. The screw/cap assembly provides fine-tuning capability through threaded engagement with the valve spring mechanism.

Working Principle

The adjustment screw/cap works by compressing or decompressing the valve spring through threaded rotation. Turning the screw clockwise increases spring compression, raising the set pressure, while counterclockwise rotation decreases compression, lowering the set pressure. This mechanical adjustment allows precise calibration of the relief valve's opening pressure.

Materials

Typically made from corrosion-resistant materials: stainless steel (AISI 304/316), brass (C36000), or alloy steel with protective coatings. High-temperature applications may use Inconel or titanium alloys.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Head Type	Hex socket, slotted, or knurled
Thread Type	Metric (M6-M12) or UNC/UNF
Thread Pitch	1.0-1.75 mm or 20-28 TPI
Torque Range	5-50 Nm
Pressure Range	Up to 6000 psi
Temperature Range	-40°C to 400°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 4126, ASME B1.1, DIN 13

Parent Products

This component is used in the following industrial products

Relief Valve

A safety device installed on a distribution manifold/block to prevent overpressure by automatically releasing excess fluid when pressure exceeds a preset limit.

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Engineering Analysis

Risks & Mitigation

Over-tightening causing thread damage
Corrosion in aggressive environments
Vibration-induced loosening
Incorrect pressure setting leading to system failure

FMEA Triads

Trigger: Excessive torque during adjustment
Failure: Thread stripping or screw head deformation
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications

Trigger: Corrosive fluid exposure
Failure: Material degradation and seizure
Mitigation: Select appropriate corrosion-resistant materials and apply protective coatings

Trigger: Vibration in operation
Failure: Screw loosening and pressure drift
Mitigation: Install locking mechanisms (lock nuts, thread-locking compounds)

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% of set pressure for standard applications, ±2% for precision applications

Test Method

ASME PTC 25 pressure testing with calibrated gauges, leak testing per ISO 4126

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.

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Manufacturers of Adjustment Screw/Cap

Manufacturer profiles associated with Adjustment Screw/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 screws be recalibrated?

Annual recalibration is recommended for critical applications, or whenever system pressure parameters change. Regular maintenance should include torque verification and thread inspection.

Can adjustment screws be used with all relief valve types?

No, they are specifically designed for spring-loaded direct-acting relief valves. Pilot-operated or rupture disc valves require different adjustment mechanisms.

What causes adjustment screw failure?

Common failures include thread stripping from overtightening, corrosion from incompatible fluids, galling from inadequate lubrication, and fatigue from vibration.

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 Screw/Cap