Check Valves FAQ – Pipetech Supplies

Below you'll find answers to the most common questions we receive about our check valve collection. If you need further technical guidance or help selecting the right valve for your application, our team is ready to assist.

What is a check valve and how does it work?

A check valve is a one-directional flow device that allows fluid to pass in one direction while automatically preventing backflow. It operates without external actuation; the pressure of the flowing medium opens the valve, and any reversal of flow or drop in pressure causes the valve to close. This makes check valves essential for protecting pumps, meters, and other equipment from damage caused by reverse flow.

What types of check valves does Pipetech Supplies offer?

Our collection includes swing check valves, spring check valves (also known as disc or non-return valves), and wafer-pattern check valves. These are available in a range of materials and connection types to suit different system pressures, temperatures, and media. Specific product listings detail the construction, pressure ratings, and applicable standards for each valve type.

What materials are your check valves available in?

We stock check valves in brass, stainless steel, cast iron, and ductile iron, among other materials. The right choice depends on the medium being handled, operating temperature, system pressure, and whether the application involves potable water, chemicals, or general industrial fluids. If you're unsure which material suits your application, contact our team for guidance.

What pressure ratings do your check valves cover?

Our check valves are available in pressure ratings that include PN16 and PN25, which are the most common ratings for commercial and industrial systems in the UK. Some products also conform to ANSI 150/300 flanged standards for higher-pressure or international specification requirements. Always confirm the pressure rating against your system's maximum working pressure before ordering.

Are any of your check valves WRAS-approved for potable water systems?

Yes, selected check valves in our range carry WRAS (Water Regulations Advisory Scheme) approval, making them suitable for use in potable water supply systems. WRAS-approved products are clearly identified on their individual product pages. If your project requires compliance with UK water regulations, look for the WRAS designation or ask us to confirm suitability.

How do I choose the correct size check valve for my system?

Check valve sizing should match the nominal bore of your pipework and account for the flow rate, pressure drop, and connection type (threaded, flanged, or wafer). Undersizing can restrict flow and increase pressure loss, while oversizing may prevent the valve from closing reliably. We recommend referencing the Cv or Kv flow coefficient listed on each product page and consulting your system design specifications.

Can I use a check valve in a vertical pipeline?

It depends on the valve type. Spring-loaded (disc) check valves are generally suitable for both horizontal and vertical installations because the spring assists closure regardless of orientation. Swing check valves, on the other hand, typically require horizontal installation with the correct flow direction. Always check the manufacturer's installation guidelines provided on the product page.

What is the difference between a wafer check valve and a flanged check valve?

A wafer check valve is a compact design that fits between two flanges using the pipeline's own bolting, making it lighter and more space-efficient. A flanged check valve has its own integral flanges and is bolted directly to the mating pipe flanges. Wafer types are popular where space and weight are limited, while flanged types offer easier removal for maintenance without disturbing adjacent pipework.

Do you offer next-day delivery on check valves?

Next-day delivery is available on most stock items, including many of our check valves. Delivery timescales depend on stock availability at the time of order and your delivery location within the UK. If your project is time-sensitive, place your order early in the day and contact us to confirm dispatch and expected arrival.

Can I get technical support to help specify a check valve for my project?

Absolutely. Our team has decades of combined experience in industrial fluid-handling systems and can help you select the right check valve based on your application, pressure class, media, and connection requirements. You can reach us by phone or email, and we're happy to assist mechanical contractors, design engineers, building managers, and anyone else who needs specification-driven support.