Most pipeline systems require some form of fluid control whereby it is essential to maintain flow in one direction, operating automatically to prevent flow in the other direction using a non-return valve.
The Norval cone and diaphragm non-return valve has design features which practically approach the optimum to both the main function of the 'check valve' and the many secondary important factors which surround it.
A non-return valve should be able to:
- shut off tight even at low differentials
- open at small differentials
- have low resistance to flow
- operate silently
- give long, trouble-free service
- be easy to install
- operate efficiently, within a large flow range
Most valves on the market can manage some of these requirements — a Stokes Norval non-return valve is designed to do them all. If you use non-return valves, examine the parameters of the silent operating Stokes Norval non-return valve.