401475 HOFFMAN MODEL 508 WATER VENT VALVE, 1/8 NPT 🔥
Hoffman 401475, Model 508 Water Vent Valve for Steam and Water Systems
📘 Product Overview
The Hoffman Model 508 Water Vent Valve is designed for automatic or manual venting of convectors, radiators, and other water or steam systems. Featuring a disc-type vent with a built-in check valve, this valve allows for venting without draining the system. Its cartridge with replaceable discs ensures easy maintenance and long-lasting performance.
Ideal for use with Model 550 Air Chambers, the Model 508 valve is suitable for steam systems up to 15 psig and water systems up to 50 psig, making it a versatile and reliable solution for controlling air and preventing pressure buildup.
✅ Key Features
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Disc-type vent for precise venting
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Built-in check valve to prevent backflow
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Automatic venting of convectors and radiators
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Cartridge with discs can be replaced without draining the system
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1/8" NPT straight shank for easy installation
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Mounts straight
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Maximum water pressure: 50 psig (3.5 bar)
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Maximum steam pressure: 15 psig (1.0 bar)
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Operating temperature: 140 to 240°F
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Easy maintenance and cleaning
⚙️ Specifications
| Feature | Specification |
|---|
| Model |
Hoffman 508 |
| NPT Size |
1/8" |
| Vent Type |
Disc-type |
| Check Valve |
Built-in |
| Mounting |
Straight |
| Max Water Pressure |
50 psig (3.5 bar) |
| Max Steam Pressure |
15 psig (1.0 bar) |
| Temperature Range |
140–240°F |
| Cartridge |
Replaceable without draining system |
| Application |
Steam or water venting, automatic or manual |
⚠️ Symptoms
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Air trapped in radiators or convectors
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System not heating evenly
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Gurgling or banging noises in the piping
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Pressure fluctuations in the system
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Water hammer caused by trapped air
❓ Frequently Asked Questions (FAQ)
Q: Can this valve be used in both steam and hot water systems?
A: Yes, it is rated for up to 50 psig water systems and 15 psig steam systems.
Q: Do I need to drain my system to service the valve?
A: No, the cartridge with discs can be replaced without draining the system.
Q: How does the check valve help?
A: It prevents backflow and ensures proper venting without letting water or steam escape back into the system.
Q: What maintenance is required?
A: Periodically check and clean the discs if needed; replace if worn or damaged.
🛒 Shopping Tips
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Verify system pressure to ensure compatibility: max 50 psig for water, 15 psig for steam.
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Ideal for radiators, convectors, and automatic air vent systems.
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Check if your system uses a Model 550 Air Chamber for optimal compatibility.
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Keep spare replacement cartridges on hand for easy maintenance.
