Where do you put a double check valve in the UK?
The UK’s Water Regulations state that a double check valve should be fitted near the tap and after any other appliances or tees and the valve you choose must be compliant with the Water Supply Regulations 1999. Under RWC’s family of brands, there are a whole host of double check valves, each with unique benefits.
What’s the difference between check and non return valves?
For this reason, spherical valves with a one-way valve are known as “non-return” valves and not “check”. The term “check” in the context of the Water Regulations refers to backflow prevention.
What are the different types of check valves?
The wafer flap valve is a slimmer version of the same design. Other designs include the tilted plate NRV and the ball NRV. By definition, check valves have a moving element (the obturator) which is held open by the forward flow (Fig 1).
How are check valves held open and closed?
By definition, check valves have a moving element (the obturator) which is held open by the forward flow (Fig 1). If the forward flow ceases, the moving element is held on the valve seat by spring action assisted by backpressure, sealing off backflow (Fig 2.).
What do you need to know about double check valves?
Double Check Valve Product Description. The double check valve for the push-fit connection of plastic and copper pipe. Designed, manufactured and assembled in the UK by John Guest Speedfit. The double check valve only allows water to flow through in one direction, therefore, preventing backflow of potential contaminants.
What is maximum pressure of Watts double check valve?
Check with local inspection authorities for installation requirements. Maximum Working Pressure: 175psi (12.06 bar).The Watts Series 007M1QT Double Check Valve has only one cover so it is easy to maintain and there are no special tools required for servicing it. It is a compact design with replaceable seats and seat discs.
What’s the difference between a non return valve and a check valve?
Fundamentally – check valves (CVs) and non-return valves (NRVs) are different fittings and serve different purposes. Under UK plumbing regulations, the ‘check valve’ has a specific purpose as a device legally permitted to be used to prevent backflow in defined circumstances.
What kind of cast iron is a Watts double check valve made of?
It consists of a bronze (1/2 to 2 in) or fused epoxy coated cast iron (2 1/2 to 3 in) body construction that is easy to maintain and service. Series 007 is ideal at referenced cross-connections identified as non-health hazard applications. Check with local inspection authorities for installation requirements.
