BM Engineering Supplies provides a wide range of non-return valves for water, wastewater and pumping applications. A non-return valve, also known as a check valve or one-way valve, commonly utilises water. However, non-return valves for gas are also available.
Non-return valves work by allowing media to flow through them in only one direction. These two-port valves have two openings in the body, one for media to enter and the other for media to leave. Available in a wide range of sizes and costs, Non-Return Valves are generally small, simple and inexpensive.
Non-return valve types
At BM Engineering, we have an array of non-return valve types on offer. When choosing the correct non-return valve for your application, you must take several things into account including the type of media you are working with and where your non-return valve will be situated in your system.
The main types of non-return valves available at BM Engineering include:
- Ball NRVs
- Diaphragm NRVs
- Swing check NRVs
- Stop check NRVs
- Lift check NRVs
- In-line NRVs
Non-return valve brands
There are a wide variety of non-return valve brands and at BM Engineering we stock only the best non-return valve products.
The brands we supply include:
Inoxpa’s non-return valve 72700 prevents media from flowing backwards and ensures that it flows in only one direction. This Inoxpa non-return valve can be used to prevent loss of prime of the pump and water hammer. It is used in the food processing, cosmetics, pharmaceutical and chemical industries, as well as in the beverage, wine and oil production.
The Inoxpa 72700 offers the following features and benefits:
- DN 25/1″ to 100/4″
- Easy assembly/disassembly with the clamp
- Reduced size design
- Connections: weld OD / weld DIN / RJT / IDF / Tri-Clamp / DIN 11851
Zwick Armaturen has 30 years’ experience in designing and manufacturing valves of the highest standard. Their check valve TRI-CHECK combines all the benefits of their TRI-CON series of valves in a non-return valve. It features a triple-offset design with a wide seat angle and a true cone in cone, as well as ensuring no rubbing while moving and absolute zero leakage performance. The check valve series TRI-CHECK has proved to be the ideal non-return valve for water pump applications.
The Zwick Armaturen TRI-CHECK offers the following features and benefits:
- Statically held gasket
- No pinned disc design
- Hydraulic damper and counterweight
- Suitable as a combined check and isolating valve or as a check valve
A non-return valve should be installed if you are looking for a valve that allows media to flow in only one direction. A non-return valve can be fitted to ensure that a media flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.
The terms ‘check valve’ and ‘non-return valve’ are interchangeable and are actually the same thing. Both non-return and check valves can stop backflow from occurring, and when used in drinking water applications have to be tested and meet a very strict criterion. This ensures damaging fluids are not able to be drained back into drinking water systems.
Most non-return valves do restrict flow but the amount depends on the type of non-return valve. Swing type wafer non-return valves have a reduced bore so these will restrict flow somewhat. All non-return valves will have some kind of internal mechanism which will restrict the flow, but this is necessary to the operation of the valve.
Water hammer can be caused by a valve closing abruptly, sending a ‘slug’ of fluid down the line. Some non-return valves can cause water hammer when they close, especially a swing type which can slam shut. The risk of water hammer caused by a non-return valve can be minimised by using a type with a spring which closes more slowly.
A non-return valve should be fitted anywhere in a system where it is essential to have no flow in the reverse direction. Common places for a non-return valve to be installed are after a pump or a steam trap.