However, if refluxing material presses against it, the closing element is pressed onto the valve seat and the valve seals even more. The valves are used, for example, in service water heaters. Here they are mounted directly in front of the storage inlet, so that expanding hot water can not flow back into the cold water pipe. However, there are also check valves without spring. Here, the returning fluid presses the closing element into the valve seat, so that the flow is also only possible in one direction. In our online shop, we offer you high quality check valves for the
- Water supply,
- Air conditioning,
- Compressed air systems,
- heating systems
and much more. The valves are available in different sizes such as 1/8 ", 1/4", 3/8 ", 1/2", 2/4 ", 3/4" and one inch, so that they fit perfectly into the pipe system or the insert the appropriate hose connection. We offer high quality at reasonable prices. Through our large warehouse, we can assure our customers short delivery times for each product.
Check valves with NBR and FKM seals
For compressed air, heating, water supply and air conditioning systems, our check valves brass and brass nickel plated, by the brands ITAP SpA and AZ Pneumatica Srl, are recommended. All models are equipped with female thread connections according to the standard ISO 228/1 and are often available in several sizes. Depending on the model, the operating pressure is 2-10 bar, 0-16 bar or 0.1-25 bar. The seals are made of either NBR (acrylonitrile butadiene rubber) or FKM (fluoro rubber). NBR is a commonly used material that convinces due to its good mechanical properties and its resistance to lubricating greases and lubricating oils based on mineral oil. However, this material is not resistant to aromatic and chlorinated hydrocarbons, high aromatics fuels, glycol based brake fluids, polar solvents, and flame retardant fluids such as HFD. The material FKM (fluorine rubber) is characterized by its high temperature resistance and its resistance to chemicals. Therefore, it is also suitable as a sealing material for pipe systems with mineral oils, mineral fats, aliphatic, aromatic and chlorinated hydrocarbons, fuels, many organic solvents and flame retardant hydraulic fluids. Furthermore, this material has a very long life and ozone resistance. FKM is not resistant to water vapor, hot water, brake fluids based on glycol, polar solvents and low molecular weight organic acids.
Acetal valves are versatile
Plastic check valves are suitable for the use of water as well as air and other gases as well as various chemicals. Our models of the manufacturer DMT CO. LTD have either hose connection sizes (O.D.) of 6.0 mm, 8.0 mm, 10 mm and 12 mm. The operating pressure is 0 to 10 bar, the robust housing is made of acetal. Acetal is the abbreviation for acetaldehyde diethyl acetal and polyoxymethylene. It is a high molecular weight thermoplastic with high stiffness, low friction and high dimensional stability, which is often used for precision parts. The sealing material used here too is NBR. This material is often used because of its excellent mechanical properties and resistance to mineral oil based lubricating oils and greases and is also found in many of our nickel plated brass check valves.
fluid24.eu - your competent partner in all areas of valve technology
With us both business customers and private customers can buy. We carry high quality products at reasonable prices, which are shipped quickly due to a large warehouse and arrive at the customer. For the trade we offer many B2B advantages such as individual discounts and a shipment of stock goods on the same day, if the order is received before 12 clock. Since Valves 24 is a specialized dealer, our staff is technically well prepared. If you have questions about individual products, our specially trained and competent staff will be happy to assist you by phone or via our contact form. The payment of the goods is very convenient by invoice, via PayPal, prepayment or cash on pickup. Let us convince you of our offers and our short delivery time and buy your non-return valve directly from us. We also stock a wide range of solenoid valves, connectors, irrigation control valves, hand operated or electric work, water pressure regulator and manometern and hoses of various thicknesses and designs. Matching hose-connector and a variety of couplings and fittings you also get very cheap, reliable and fast on fluid24.eu.
Check valves in piping systems are a safety device that prevents the backflow of media in the liquid or gaseous state. Most of the valves are spring loaded: on one side there is a closing element in the form of a ball, a cone, a flap or a membrane, which is pressed by the spring in the valve seat. As soon as the fluid flowing through presses against the spring, the closing element opens and releases the flow. However, a return flow is not possible because the closing element can open only in one direction.