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The Haskel 28303 is a high-performance stainless-steel check valve designed for demanding gas and fluid systems. Featuring a spring-loaded poppet and Viton seal (with a PTFE/PTFE-pop metal-to-metal seating option), it provides reliable backflow protection under extreme conditions. With an operating pressure rating up to 6 000 psi (per FLW) and 15 000 psi hydraulic / 10 000 psi gas (per Fluid Process Control), this valve ensures precise, repeatable cracking behavior. It’s easy to install thanks to its ½″ NPTF connections and compact design. Ideal for pneumatic boosters, chemical injection, and hydraulic circuits.
- Stainless steel body and seat with optional PTFE or Viton sealing
- 1/2″ NPTF threaded connections, compact 3⅛″ length
- Cracking pressure around 5 psi (semi-soft seat)
- High flow capacity (Cv ≈ 2.10); flow path avoids spring
- Rated for up to 15,000 psig hydraulic and 10,000 psig gas service
| Part Number | 28303 |
| Connection | ½″ NPTF female |
| Length | 3‑1/8″ |
| Hex Size | 1‑1/8″ |
| Cv | 2.10 |
| Cracking Pressure | ~5 psi |
| Max Pressure | 6,000 psi (FLW data); Up to 15,000 psi hydraulic / 10,000 psi gas |
| Seal Materials | Viton o-ring; PTFE hard-seat variants available |
| Body Material | 316 stainless steel |
| Weight | ~3 lb shipping weight |