Relief Valve Spring: Set Pressure Range 0.1-100 MPa

Component Specifications

Definition

The relief valve spring is a critical mechanical component within pressure relief valves and pressure gauges that provides calibrated force to keep the valve closed under normal operating conditions. When system pressure exceeds the predetermined set point, the spring compresses, allowing the valve to open and release excess pressure to prevent equipment damage or hazardous conditions. This component must maintain precise mechanical properties throughout its service life to ensure reliable pressure regulation.

Working Principle

The spring operates on Hooke's Law (F=kx), where applied force is proportional to displacement. Under normal pressure, spring tension holds the valve closed. When pressure exceeds the set point, the force overcomes spring tension, compressing the spring and opening the valve to release pressure until equilibrium is restored.

Materials

High-carbon steel (AISI 1095, EN45), stainless steel (AISI 302/316, 17-7PH), Inconel 718 for high-temperature applications. Materials are heat-treated to achieve specific tensile strength (1500-2200 MPa) and fatigue resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cycle Life	>1,000,000 cycles
Free Length	20-200 mm
Spring Rate	10-500 N/mm
Wire Diameter	1.0-10.0 mm
Set Pressure Range	0.1-100 MPa
Operating Temperature	-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 4126-1, ASME BPVC Section VIII, DIN 3320, API 526

Parent Products

This component is used in the following industrial products

Pressure Gauge and Relief Valve

A combined monitoring and safety device that measures fluid pressure and prevents overpressure conditions in the mud mixing and pumping system.

View Product Details

Engineering Analysis

Risks & Mitigation

Spring fatigue leading to pressure setting drift
Corrosion reducing spring force
Overheating causing loss of temper
Incorrect installation causing binding

FMEA Triads

Trigger: Material fatigue from cyclic pressure fluctuations
Failure: Spring loses calibration, causing premature or delayed valve opening
Mitigation: Regular pressure testing and replacement per maintenance schedule

Trigger: Corrosive environment attacking spring material
Failure: Reduced cross-sectional area and spring force
Mitigation: Use corrosion-resistant materials (stainless steel, Inconel) and protective coatings

Trigger: Over-temperature operation
Failure: Loss of temper and permanent set
Mitigation: Select appropriate high-temperature materials and ensure proper cooling

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±3% of set pressure for standard applications, ±1% for critical services

Test Method

ASME PTC 25 pressure testing with certified calibration equipment

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 Relief Valve Spring

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.

Tianjin Geostar Petroleum Equipment Co., Ltd.

Tianjin, CN

Also makes: Mud Pumps, Industrial Pumps, Centrifugal Pump and 9 more

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

Listed there as: “relief valve spring”
View source page ↗ geostarpe.com · checked 2026-09-16

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 relief valve springs be replaced?

Typically every 3-5 years or according to manufacturer recommendations, but more frequently in corrosive environments or high-cycle applications. Regular testing is essential.

Can relief valve springs be recalibrated?

No, springs are manufactured to specific set points and cannot be reliably recalibrated. Replacement with correctly rated springs is required for pressure setting changes.

What causes relief valve spring failure?

Common causes include fatigue from cyclic loading, corrosion, overheating beyond material limits, and permanent set from over-compression.

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.

Relief Valve Spring