1/8 in. Inline Check Valve, Vertical or Horizontal
1/8 in. Inline Check Valve, Vertical or Horizontal
✓ In stock at our distribution warehouses — typically ships within 1–2 business days.
Flat-rate shipping, nationwide- Orders under $100: $9.95
- $100 – $499.99: $14.95
- Orders $500+: quoted — real freight for your order, not a flat guess
Volume order or crossing a competitor part number? Request a quote — usually answered the same business day.
The 1/8 in. Inline Check Valve, Vertical or Horizontal (#947140) is a spring-loaded brass inline check valve that allows flow in one direction and closes automatically to prevent backflow. Buna-N (NBR) seals suit water, oils, and many chemical services. Compact inline body installs in any orientation — vertical or horizontal — without special mounting.
Technical Specifications
| Specification | Value |
|---|---|
| Body Material | Brass body |
| Spring Material | Stainless Steel |
| Seal / O-ring | Buna-N (NBR) |
| Pressure Rating | 150–500 PSI depending on model |
| Temperature Range | −20°F to 250°F (−29°C to 121°C) |
| Installation | Any orientation (vertical or horizontal) |
| Part Number | 947140 |
Key Features
- Brass body / Stainless spring construction
- Spring-loaded — closes automatically when flow stops or reverses
- Install in any orientation — vertical or horizontal
- Buna-N (NBR) seals — compatible with water, oils, and most process fluids
- Cracking pressure factory-set for reliable sealing
- Compact inline form factor — minimal installation space required
Common Applications
Used as backflow preventers in chemical metering pump systems, water treatment injection points, pump discharge lines, and process piping where reverse flow would contaminate upstream systems or damage equipment.
Technical Resources
- Check Valve Types: Swing, Spring, Wafer, Ball — Understand the differences
- How to Choose the Right Valve — Application selection guide
- Shop Brass Check Valves — Full brass 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