AI-903 WRAS-Approved Double Check Valve
This Series 100 AI-903 double check valve is used to prevent the risk of backflow and back siphonage contamination in domestic dwellings, public and commercial buildings. The smaller sizes should be installed close to the water outlet such as taps, basin taps, showers and toilets to prevent back siphonage contamination to the water supply, should a mains supply pipe burst. The larger sizes are installed in the main cold water supply inside public and commercial buildings. The double check valve is WRAS-Approved.
Pressure/temperature rating based on: BS EN 1254-2
Max operating temperature at 16 bar: 30°C
Max operating temperature at 10.86 bar: 60°C
Max operating temperature: 85°C
Min operating pressure: 0.2 bar
Conforms to: BS EN 13959
Components:
- Body: BS EN 12420 CW602N DZR Copper Alloy
- Cartridge: POM
- Retaining Clip: Aisi 302 Stainless Steel
- O-Ring: Nitrile/EPDM Rubber
- Compression Nut: BS EN 12165 VW617N Brass
- Olive: BS EN 12449 CW508LM Brass
Double Check Valve AI-903 – WRAS Approved
Double Check Valve AI-903 is used to prevent the risk of backflow and back siphonage contamination in domestic dwellings, public and commercial buildings.
Get Value with a WRAS-Approved Double Check Valve
A Double Check Valve is a crucial plumbing component used to stop contaminated or potentially polluted water from flowing backward into clean water supplies.
Definition and Functionality of These Valves
The two common water safety threats, which are backflow and back siphonage, occur in various plumbing systems due to sudden pressure drops, system failures, or improper design. The prevention of polluted water from flowing backward into clean water supplies is critical.
WRAS-Approved Double Check Valve is engineered with precision to deliver exceptional protection from water system backflow and back siphonage. For instance, the AI-903 has two non-return valves housed within a single brass body. When water flows in the correct direction, both check valves open, facilitating uninterrupted flow. Conversely, each check valve snaps shut when there is a reversal of flow due to a pressure drop.
If one check valve fails in the Double Check Valve, the second one remains fully operational and continues to isolate the backflow. This increases system safety and reliability. The efficiency of the Double Check Valve Function makes it ideal for many applications, including:
- Domestic plumbing systems
- Boiler systems for public and commercial buildings
- HVAC and potable water systems
Why You Should Choose Us for AI-903 Double-Check Valve
When it comes to valves, including the Double Check Valve, FloControl offers quality. The AI-903 valve stands out as a trusted choice for installers, facility managers, and specifiers alike. It gains its edge through a combination of engineering quality, ease of use, and verified safety credentials. The WRAS-Approved Double Check Valve is manufactured using high-grade, corrosion-resistant materials, such as DZR brass, making it highly resilient to the rigours of its environments. After AI-903 Double Check Valve Installation, it delivers consistent, uninterrupted performance.
Frequently Asked Questions
What is a Double Check Valve used for?
This valve is primarily used to protect potable water systems from contamination caused by backflow. The valve does this by blocking reverse flow, thereby maintaining water hygiene in domestic, commercial, and public environments.
How does the AI-903 valve prevent backflow and contamination?
The effective Double Check Valve Function is facilitated by a dual spring-loaded check mechanism. Each internal valve is designed to allow water to flow forward but closes instantly if the flow attempts to reverse. This setup is particularly important in medium-risk scenarios where contamination could pose health hazards.
Where should this valve be installed in a plumbing system?
The Double Check Valve Installation location should be where the risk of backflow contamination is moderate. The areas include secondary water storage tanks that are indirectly connected to mains water, garden taps, and irrigation systems. This installation should be carried out per local plumbing regulations, ensuring the correct valve orientation.
How often should this valve be inspected or replaced?
The inspection frequency depends on the risk category and usage environment. For domestic applications, a yearly inspection is recommended. In commercial premises like public buildings, a six-monthly check is advised. The signs of repair or replacement include visible corrosion, leaking joints, and unexpected pressure drops.
Can the AI-903 be installed vertically or horizontally?
Yes, the AI-903 Double Check Valve is engineered to accommodate both vertical and horizontal pipe runs. The only critical requirement is that the valve be installed in the correct flow direction, which is marked on the body of the unit.
Do these valves reduce water pressure?
All valves introduce a slight resistance to flow, but the AI-903 is designed to minimise pressure loss. Its internal mechanisms and bore design ensure that water flows smoothly when the valve is fully open. While there may be a marginal reduction in pressure, it is generally negligible and won’t affect typical domestic or commercial plumbing fixtures.
