What is a non-return valve used for?
A non-return valve allows a medium to flow in only one direction and is fitted to ensure that the medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.
How does a non-return valve work?
Non-return valves work by allowing media to flow through them in only one direction. These valves have two openings in the body, one for media to enter and the other for media to leave. Non-return valves work automatically, which means that most are not controlled by a person or an external control.
Do you need a non-return valve on a pressure pump?
The valve could be a source of a transient flow leading perhaps to severe pressure waves, NRV should be installed directly downstream of the pump in order to protect the pump from any damage due to the consequences of any generated surge pressures.
What happens when non return valve fails?
For example, failing check valves will start to vibrate and even lose some internal parts when problems begin to arise. Other symptoms of check valve failure include reverse flow and excessive component wear and damage. Check valves will also emit noises as they start to break down.
How do you check a non return valve?
All the non return valve have a X mark at the end of valve spindle. These will help you to identify a non return valve without dismantling.
When should a non-return valve be installed?
Non-return valves are used in systems where it is desirable to make sure fluids flow mostly in one direction, but may not be critical, for example in pumped systems such as heating circuits.
How does a non return valve for drainage work?
When water leaves the property, the flap opens and will close again once the pressure has rescinded. The valve is designed open with just the pressure from the flush of a toilet. In a flood event, or a back up of water due to blocked rains, the valve is closed shut to prevent back flow. In addition, a stainless steel flap stops rats in the drains.
Which is the best non return pipeline valve?
The Philmac Non-Return Valve is the perfect choice for preventing back flow so pipelines do not drain and cause damage to high value equipment such as pumps. The valves have been designed to work in either vertical or horizontal position for flexible installation.
Why are foot and non return valves rated at 1600 KPA?
The seal remains the same proven design which allows it to reliably seal at low pressure. Improved flow path minimising turbulent zones. Foot and non-return valves are rated to 1600 kPa (static shutoff) to meet the requirements of high pressure systems.
How big is a non-return valve philmac?
Non-Return Valves Product Sizes Product Number Size 95 8022 00 3/4″ 95 8023 00 1″ 95 8024 00 1-1/4″ 95 8025 00 1-1/2″