SLV
Wafer Check Valve
The SLV Wafer Check Valve is a compact non-return valve that clamps directly between pipe flanges, using a pair of spring-loaded plates to stop backflow. Its short body and fast, spring-assisted closure make it a space-saving, low-slam alternative to conventional swing check valves.
Product Benefits
- Closes before reversal: The dual-plate design shuts before reverse flow can build up momentum, because twin torque springs start folding the plates closed as forward flow decays.
- No water hammer: That early closure eliminates the water hammer caused by slamming swing checks.
- Gentler on the system: The result is quieter operation and less shock loading on pumps, gaskets and pipe supports.
- Very short face-to-face: As a wafer pattern, it needs a fraction of the space and weight of a flanged swing check.
- Fits tight layouts: That compactness is often the deciding factor on pump skids and in crowded pipe galleries.
Where It's Used
- Pump discharge protection: Typical duties are backflow prevention on pump discharges.
- Tight spaces, no slam: It also suits water and general service lines where space is tight and slam must be avoided.
- Drops between flanges: It installs between standard flanges, so it fits most existing flanged piping without special adapters.
Good to Know
- Vulcanized rubber seat: The seat is rubber, vulcanized directly onto the valve body, which gives a resilient, tight seal on suitable media.
- Check elastomer compatibility: Confirm that the elastomer suits the fluid and its temperature.
- Two D-shaped passages: The plates split the bore in two, so allow a little more pressure drop than with a full-bore valve.
- Inspect the springs: Springs are the working heart of the valve and set its closing behavior, so include them in periodic inspection.
- Size for full opening: Correct sizing, so the plates are fully open at normal flow, keeps flutter and wear to a minimum.
