Pressure safety valve (PSV)

Flanged spring-loaded relief valve with an angle body, bolted bonnet, closed or open-yoke spring housing with exposed coil, screwed cap with seal wire, optional packed lifting lever and bellows vent. Inlet and outlet sizes, classes and centre-to-face dimensions come from API 526 for the orifice letter and inlet class. Origin at the body centre; inlet faces down, outlet faces +X.

Installation

Copies valves/pressure-safety-valve.tsx and the shared lib/ into src/components/deck-twin/. Needs three, @react-three/fiber and @react-three/drei. See installation for the manual route.

Usage

import { Canvas } from '@react-three/fiber'
import { OrbitControls } from '@react-three/drei'
import { Stage } from './components/deck-twin/lib/stage'
import { PressureSafetyValve } from './components/deck-twin/valves/pressure-safety-valve'

export default function Scene() {
  return (
    <Canvas shadows camera={{ position: [8, 5, 9], fov: 35 }}>
      <Stage>
        <PressureSafetyValve />
      </Stage>
      <OrbitControls makeDefault />
    </Canvas>
  )
}

Props

P&ID

Angle body: one triangle pointing up from the inlet below and one pointing in from the outlet on the side, meeting at a right angle, with a zig-zag spring rising from the meeting point to a short cap line. The set pressure and orifice letter (e.g. 3K4, set 42 barg) are written beside it.

tag PSVtag PRVtag TSVtag RVISA PSVISA PRVISA TSVISA PSEISO 10628-2 / PIP PIC001 / ISA 5.1

The spring zig-zag tells it from a check valve or a plain angle valve. A rupture disc (PSE) is drawn as a curved disc between flanges with no spring. Size code like 3K4 means 3" inlet, K orifice, 4" outlet. The outlet line goes to the flare header (FL / RV) or to atmosphere; on a pilot-operated PSV a small pilot box is drawn beside the spring. ISA codes here: PSE = rupture disc.

Pressure relief valve datasheet (API 526 / API 520, ISA-TR20.00.01 form) fields and the props they set

Orifice letterorifice

Inlet flange ratinginletRating

Bonnetbonnet

Lifting leverlever

Balanced bellowsbellows

Tag numbertag

Typical suppliers

Emerson Crosby. The geometry is generic and sized from public standards. It is not vendor CAD.

For agents

Machine-readable entry with props, ranges, defaults and ports:

Or fetch /r/pressure-safety-valve.json, or copy a ready-made instruction:

Add the Deck Twin "Pressure safety valve (PSV)" component to this project. Run `npx -y https://decktwin.com/cli/deck-twin-0.2.2.tgz add pressure-safety-valve` (it copies the file and the shared lib into src/components/deck-twin/), then `npx -y https://decktwin.com/cli/deck-twin-0.2.2.tgz info pressure-safety-valve` for its props, ranges and ports. Render <PressureSafetyValve /> inside a React Three Fiber <Canvas shadows>, wrapped in <Stage> from src/components/deck-twin/lib/stage. Set props from my data (metres, NPS in inches, ASME class) and leave the rest at defaults. Install three, @react-three/fiber, @react-three/drei and @types/three if they're missing. Full guide: https://decktwin.com/skill/SKILL.md