Heat-Timer 925005-00 – 1/8" Angle VariValve Radiator Steam Vent
Product Overview
The Heat-Timer 925005-00 1/8" Angle VariValve is a high-performance adjustable radiator steam vent for low-pressure steam heating systems. Designed to control and accelerate air venting, it helps radiators heat quickly and evenly by allowing steam to fill radiators efficiently.
With a fingertip adjustable venting rate, phosphor bronze bellows, and a solid brass case, this vent ensures quiet, long-lasting, and reliable operation. Its 90° angle design makes it easy to install on most radiator systems.
✅ Key Features
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✔️ 1/8" Male Thread, 90° angle radiator steam vent
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✔️ Variable orifice up to 5/16" for adjustable venting speed
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✔️ Phosphor bronze bellows for positive shut-off and long life
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✔️ Solid brass body with heavy plating for durability
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✔️ Quiet operation – no clicking or hissing
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✔️ O-ring seal for high-temperature sealing
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✔️ Max operating temperature: 240°F
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✔️ Helps radiators heat faster by controlling steam fill rate
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✔️ Regulates temperature distribution per room for more even heating
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✔️ Adjustable venting rate with fingertip lever
📊 Specifications
| Specification | Details |
|---|
| Part Number |
925005-00 |
| Manufacturer |
Heat-Timer |
| Type |
Radiator Steam Vent – VariValve |
| Pipe Thread |
1/8" Male |
| Orifice Size |
Adjustable up to 5/16" |
| Style |
90° Angle |
| Material |
Brass body with phosphor bronze bellows |
| Max Temperature |
240°F |
| Function |
Provides air venting from radiator for efficient steam fill |
| Operation |
Fingertip adjustable venting rate, quiet |
⚠️ Common Symptoms Indicating Replacement
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Radiators heat slowly or unevenly
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Hissing, clicking, or noisy radiator operation
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Inconsistent room temperatures
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Steam not reaching radiators efficiently
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Radiators remain cool at start-up
❓ Frequently Asked Questions (FAQ)
Q: What is the purpose of this radiator vent?
A: It drives air out of the radiator as steam enters, allowing radiators and main lines to fill faster and more evenly.
Q: Can I adjust the venting speed?
A: Yes, the fingertip lever allows you to adjust the venting rate for optimal radiator performance.
Q: What is the maximum temperature this vent can handle?
A: Up to 240°F.
Q: What type of heating system is this vent for?
A: Designed for all low-pressure steam heating systems.
Q: Will it make noise during operation?
A: No, it features quiet operation with no clicking or hissing.
🛒 Shopping Tips
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Confirm pipe thread size (1/8") and radiator compatibility
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Use the adjustable lever to fine-tune heat distribution in each room
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Ideal for residential or commercial low-pressure steam systems
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Inspect older vents for wear to ensure proper steam flow
