Constant water level valve, vacuum breaker, check valve, backflow prevention device VD-7N type pressure type vacuum breaker (for water)
Major features
- A float structure is used for the intake mechanism. When water is flowing, it is closed securely, and when negative pressure is generated, air is introduced promptly to prevent backflow due to reverse siphon action.
- Uses a spring system that closes the valve before backflow.
- By guiding the intake port connection pipe to the drainage ditch, the surroundings will not be polluted even in the unlikely event of a valve leak.
- Equipped with a test cock as standard, you can check the functions of the check valve and intake valve while the piping is connected.
Water Supply Law Performance Standard Certification Registered Product (E-573) Pressure -Resistant Leach Durability
specification
| Product code | VD7N-F |
|---|---|
| Valve type | Vacuum breaker |
| Nominal diameter | 20/25 (3/4/1) |
| Applicable fluid | Tap water / water |
| Fluid temperature | 0-45 ℃ (cannot be frozen) |
| Applicable pressure | 0.05-1.0MPa |
| Minimum differential pressure before and after the valve | 0.05MPa |
| Minimum differential pressure for valve opening | 0.05MPa |
| End connection | Water supply connection port: JIS Rc screw Intake port: JIS Rc 1/2 |
| Mounting posture | Upright mounting on horizontal piping |
| Material body | CAC406 |
| Material Intake valve | Synthetic resin / chlorine water resistant EPDM |
| Material disc | Chlorine water resistant EPDM |
| Material Diaphragm disc | Chlorine water resistant EPDM |
| Material diaphragm | Chlorine water resistant EPDM |
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Frequently Asked Questions and Explanations
What is the purpose of the water vacuum breaker?
The vacuum breaker sucks air when the upstream side becomes negative pressure and prevents the backflow from the downstream side due to the reverse siphon action.
Does the vacuum breaker have an initial exhaust function like an intake / exhaust valve?
There is no exhaust function.
Can it be installed in buried piping?
The vacuum breaker draws in air, so avoid installing it in the ground where it may be submerged.
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