Excess-Flow Check Valves
The Pneu-Hydro excess-flow check valve has been designed to contain pressurized
fluids in the event of catastrophic down-stream failure. Its poppet is
normally held open by a spring and flow is permitted in both directions
through the valve. In the event of down-stream failure (line-rupture,
seal-failure, gauge over-pressurization and failure, etc.) the resultant
pressure-drop across the poppet orifice creates an imbalance which closes
the poppet. The poppet remains closed, preventing further escape of fluid,
until the system is repaired. Removal of supply pressure for system maintenance
allows the spring to reset the poppet to its open position.
Specifications
| Operating pressure ranges |
|
| Service |
Standard, H2S-CO2 |
| Design specification |
NACE MR-01-75 |
| Fluid |
Liquid or gas |
| Operating pressure |
50 psi (3.45 bar) |
| Working pressure |
7,500 psi (517 bar) maximum |
| Proof pressure |
10,000 psi (689 bar) |
| Burst pressure |
15,000 psi (1034 bar) |
| Operating temperature ranges |
|
| Viton temperature range |
-20° to 450°F (-29° to 232°C) |
| Flow capacity |
Cv .45 |
| Flow |
Valve shuts pneumatically at 1.0 psid |
| Internal-external leakage |
Zero |
| Weight |
.375 lbs. |
Ordering Information
| Part No. |
Description |
| 213677 |
Viton seals |
 |
