Description
McMillan
Air Non-Return (Check) Valve — In-Line (NRV314S)
Part No: NRV314S | Barcode: 16953 | Range: Air Fittings & Piping
The NRV314S is an in-line non-return (check) valve for compressed-air systems. It lets air flow one way and blocks it from flowing back, holding pressure on the downstream side and stopping back-feed toward the compressor or an isolated section of line.
Non-Return Valve
Check Valve
One-Way Flow
Compressed Air
In-Line
Spring-Loaded
Suitable For
Compressor Discharge Lines
Air Receiver Inlets
Pressure-Holding Circuits
Anti Back-Flow Points
Key Features & Benefits
- One-way flow only — passes air in the marked direction and seals against reverse flow, protecting upstream components.
- Holds downstream pressure — keeps a charged line or receiver pressurised when the supply side drops or is shut off.
- Prevents back-feed — stops air running back toward the compressor or pump when it stops, reducing wear and unloading issues.
- Inline fitting — installs directly into the air line in the marked flow direction.
When to Use This Valve
Reach for part NRV314S wherever air must travel one way only — on a compressor discharge to hold tank pressure, at a receiver inlet, or to isolate a charged circuit from back-flow. Always install it with the arrow pointing in the direction of normal flow.
Air Valve Range — Types Available
| Part No. | Type | Connection |
|---|---|---|
| 37-1510-04 | Inline Ball Valve | 1/4″ Female × Female |
| 37-B3831-04 | Ball Valve | 1/4″ Male × 1/4″ Female |
| 37-5980-08 | Ball Valve | 1/2″ |
| 04-DC3004 | Drain Cock | 1/4″ BSPT |
| NRV314S ★ | Non-Return (Check) Valve | In-Line |
| C175-41 | Non-Return Valve (Twin Tank) | Compressor Head |
| COSSV1/210BAR | Safety / Pop-Off Valve | 1/2″ — 150 PSI |
★ You are viewing the highlighted valve. Other valve types in this range are also available.
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