1/2 in. Inline Female x Female PVC Spring-Loaded Check Valve
1/2 in. Inline Female x Female PVC Spring-Loaded Check Valve
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The 1/2 in. Inline Female x Female PVC Spring-Loaded Check Valve (#940331) is a PVC spring-loaded check valve for backflow prevention in chemical dosing, water treatment, and corrosive-fluid piping. Non-metallic PVC construction resists chlorine, most acids, bases, and oxidizers that would attack metal check valves. Female NPT connections allow direct threaded installation.
Technical Specifications
| Specification | Value |
|---|---|
| Body Material | PVC (Schedule 80 construction) |
| Seal / Ball | EPDM or Viton (chemical dependent) |
| End Connections | Female NPT threaded |
| Pressure Rating | 150 PSI at 73°F |
| Temperature Range | −15°F to 140°F (−26°C to 60°C) |
| Part Number | 940331 |
Key Features
- PVC body — corrosion-resistant for most acids, bases, and chlorinated water
- Spring-loaded poppet — automatic closure on flow reversal
- Female NPT threaded connections
- Lightweight, non-metallic — no galvanic corrosion risk
- EPDM or Viton ball/seat — check compatibility chart for your media
- Transparent or translucent body options available for visual flow confirmation
Common Applications
Standard backflow preventer in water treatment chemical dosing lines, RO system reject lines, irrigation chemical injection, swimming pool chemical feeders, and any PVC piping system requiring one-way flow protection. PVC construction ensures compatibility with sodium hypochlorite, muriatic acid, sodium bisulfite, and other common water treatment chemicals.
Technical Resources
- Check Valve Types Explained — Spring, swing, ball check comparison
- PVC Chemical Compatibility Chart — Verify your media
- Shop PVC Check Valves — Full PVC check valve range
Expert Guides for This Product
- Check Valve Orientation & Installation — flow direction and mounting rules
- Check Valve Sizing Guide — why line size isn't valve size
- Slamming & Water Hammer — causes and fixes
- Check Valve Leaking? — diagnose and fix it
- Check Valve Chattering — the sizing problem nobody checks
- Buna vs. Viton Seats — which elastomer fits your media