Dual-plate check valve (wafer)

API 594 Type A wafer check valve: a short body centred by the flange studs, two half plates on a central hinge pin with a stop pin, retainer plugs, lifting eye, nameplate and flow arrow. open swings the plates up to about 80°. Set companionFlanges to draw the pipe flanges, gaskets and through-studs around it; leave it off inside a plant, where the line supplies them.

Installation

Copies valves/dual-plate-check-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 { DualPlateCheckValve } from './components/deck-twin/valves/dual-plate-check-valve'

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

Props

P&ID

Non-return symbol (a triangle pointing at a bar across the line) squeezed between two flange marks, because the wafer body sits between the pipe flanges. Many legends just use the general check-valve bow-tie with one half filled.

tag CHVtag NRVISO 14617-8 non-return symbol / PIP PIC001

Wafer-type (API 594) is usually only visible from the valve code or a "W" / "DP" note. Treat any check-valve symbol on a line ≥ NPS 3 in water or gas service with a wafer valve code as this component; otherwise use swing-check-valve.

Wafer check valve datasheet (API 594 Type A) fields and the props they set

Sizenps

Pressure classrating

Tag numbertag

Typical suppliers

Crane (DuoChek) · Stockham. 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/dual-plate-check-valve.json, or copy a ready-made instruction:

Add the Deck Twin "Dual-plate check valve (wafer)" component to this project. Run `npx -y https://decktwin.com/cli/deck-twin-0.2.2.tgz add dual-plate-check-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 dual-plate-check-valve` for its props, ranges and ports. Render <DualPlateCheckValve /> 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