VALVES & PIPING / INTERACTIVE 3D

Spring-loaded pressure-relief concept

Open the hollow nozzle, closure disc, spindle guide, six-turn spring and separate bonnet joints.

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COMPONENT INSPECTOR

Explore the assembly

Select a component to read its role. The list below also works without a 3D display.

Choose a component109 individually named components

Internal / mechanicalIllustrative connections / regionsStructure / enclosure

Colors identify parts in this teaching model. They are not an industry color standard.

HOW TO READ THIS MODEL

The system, explained.

A direct-spring pressure-relief valve uses a spring-loaded closure to respond to pressure at its inlet. Its pressure-protection role differs from a process-control valve or an ordinary check valve. This original static concept separates the hollow nozzle and disc from the spindle, guides, coil, setting markers and enclosure. Inspect their relationships without treating the illustrated spring or disc position as a set-pressure, flow or protective-system result.

Model scope and limits

Original generic static direct-spring concept with invented proportions, hollow inlet nozzle, solid adjacent disc, bored holder and guides, a closed six-turn coil, separate seats, setting/lock markers, hollow body and bonnet, lateral outlet and drilled joint components. No OEM imagery, CAD or product dimensions imported. No automatic valve event, pressure, flow, spring force, set-pressure calibration, rated capacity, blowdown, backpressure response, leakage, materials, thread forms, verified fits or full collision qualification. Huddling/blowdown design, bellows, pilot system, vent/drain details, tamper seal, connected equipment, discharge destination and complete protective system are omitted. No code classification, certified device, equipment selection, adjustment, operating or maintenance instruction.

Further reading: Spirax Sarco: direct-spring component concepts (steam teaching context) ↗

Source links support further study; no affiliation or endorsement is implied.

CHECK YOUR UNDERSTANDING

Which illustrated pair sits at the inlet closure?

Hollow stepped nozzle and closure discCap lid and inlet washerOutlet flange and upper spring seat

GUIDED COMPONENT STUDY

Trace the system.

Read each explanation, then focus its component in the explorer. This is a learning route through the model, with no operating or maintenance sequence.

Enter through the nozzle bore
The inlet nozzle has an actual open centre and an upper annular seat plane. Its stepped exterior sits inside the body region. The bore and proportions are invented: they establish no rated orifice area, capacity, attachment or manufacturing specification.
Compare the disc with the seat
The separate solid disc sits immediately above the nozzle seat in this static pose. Export checks distinguish the open nozzle from the disc closure and compare their planes. The picture calculates no pressure response, sealing contact, leakage, opening action or protective performance.
Trace the central spindle
A smooth solid spindle runs through separate bored guide and spring-seat markers. A spherical contact marker lies below it near the disc holder. These locations distinguish the parts; they do not qualify force transfer, articulation, retention, alignment or travel.
Inspect the perforated support
Six actual openings surround the spindle-guide region in a separate support plate. The guide bushing has its own centre bore. Selected rays verify holes and retained plate material, without qualifying an internal flow path, guide fit or pressure boundary.
Follow one complete coil
The gold spring is a closed six-turn mesh, between two separate seat markers. Its outer envelope fits inside the invented bonnet bore. Coil pitch and wire shape are visualization choices, with no rate, preload, fatigue, temperature or set-pressure calibration.
Distinguish a setting marker from a setting
The hollow axial marker sits above the upper spring seat and below a separate lock-location marker and cap. No threads, movement, adjustment control or numerical pressure setting are supplied. Identifying this location gives no calibration or operating procedure.
Trace the separate outlet
A hollow lateral neck aligns with an actual opening in the body wall and a bored outlet flange. It identifies a component boundary, without a discharge destination, downstream piping, backpressure result or complete protective-system design.
Compare the enclosure joint
Separate body/bonnet flanges and a gasket marker share drilled stud holes, with distinct studs, washers and bored nut markers. Reveal and isolation are presentation tools. The joint has no thread form, bolt load, gasket compression, pressure class or maintenance instruction.

Additional primary references: Spirax Sarco: spring, bellows and pilot concepts (steam teaching context) ↗

ACCESSIBLE COMPONENT REFERENCE

Every part, in plain language.

Search all components ↗Model provenance ↗

Inlet flange

Hollow inlet flange marker with eight actual fastener bores. No pressure class or attached system.

Hollow stepped nozzle

Original hollow nozzle with a geometric bore and upper annular seat plane. Invented proportions, no rated orifice, flow capacity, materials or seat finish.

Body lower shoulder

Annular body shoulder around the nozzle region. No qualified nozzle attachment or pressure boundary.

Hollow body wall

Hollow chamber wall with an actual lateral outlet bore. No casting, pressure or fluid calculation.

Hollow outlet neck

Open side connection from the body region to a separate flange. No downstream destination, piping or backpressure qualification.

Outlet flange

Hollow lateral flange with eight real stud bores. No rated facing or mating pipe.

Closure disc

Separate solid disc above the annular nozzle seat in a static adjacent pose. No leakage, pressure response or qualified sealing.

Disc holder

Separate bored carrier above the disc. Invented support relationship, without balance, lift or rated retention.

Spindle contact marker

Separate spherical contact marker between the spindle region and holder. No contact force, articulation or qualified attachment.

Smooth spindle

Solid central spindle marker connecting the disc-side and spring-seat regions. Static pose; no force transfer or travel qualification.

Perforated guide support

Separate annular guide support with six actual openings around the spindle region. No rated internal guide design.

Spindle guide bushing

Hollow guide marker around the spindle. Invented radial gap; no running fit, wear or alignment qualification.

Body bonnet flange

Annular body flange with actual matching bonnet-joint holes. No rated body-to-bonnet pressure joint.

Bonnet gasket marker

Separate gasket marker with matching geometric fastener holes. Material and compression are unspecified.

Bonnet base flange

Separate annular bonnet flange. No facing, bolt load or pressure rating.

Hollow spring bonnet

Hollow enclosure around a separate spring and seats. No pressure, vent, bellows or backpressure qualification.

Lower spring seat

Separate annular lower seat above the spindle guide region. Spring loading is not calculated.

Upper spring seat

Separate annular upper seat below the setting marker. No preload or set-pressure result.

Closed coil spring

Original closed six-turn coil between separate seat markers. No spring rate, preload, force, fatigue, temperature or set-pressure calibration.

Hollow setting marker

Hollow axial setting marker above the spring seat. Unthreaded static geometry; no adjustment, calibration or operating instruction.

Bonnet upper bridge

Bored upper bridge surrounding the setting marker. Four cap-joint bores are actual geometry.

Setting lock marker

Bored locking-location marker. No thread form, torque or qualified locking.

Cap flange

Separate annular cap flange sharing four actual joint holes with the upper bridge.

Hollow protective cap

Hollow presentation enclosure above the setting region. No tamper seal, vent or pressure qualification.

Cap lid

Solid upper closure marker; no rated closure or pressure boundary.

Inlet joint stud 1

Separate smooth stud through a geometric hole. No threads, preload, torque or rated joint.

Inlet joint washer 1