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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 NPTF connections and compact design. Ideal for pneumatic boosters, chemical injection, and hydraulic circuits.
Fitting Chart- Stainless steel body and seat with optional PTFE or Viton sealing
- 1/2 NPTF threaded connections, compact 3 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 | 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 |