What does PN (Pressure Nominal) mean?

Alphanumeric designation used for reference purposes and related to a combination of mechanical and dimensional characteristics of a component of a pipe system. Comprising of the letters PN followed the maximum design pressure in Bar – for example, PN16.

What is the difference between NRS and OS&Y gate valves?

NRS is an abbreviation for Non-Rising Stem, while OS&Y means Outside Screw and Yoke. When operating a NRS gate valve the stem rotates moving the wedge, the stem remains in full contact with the media. With an OS&Y valve the stem moves into or out of the valve in turn rising or lowering the wedge.

What is the difference between Cast Iron and Ductile Iron?

Ductile iron is a stronger material, created by the addition of magnesium alloy to molten iron. Resulting in an iron that is considerably stronger and harder to break, improved corrosion resistance and easier to machine.

What are the design constraints?

T-T offer gate valves are designed to BS5163/EN1074 for either water or wastewater duties up to 70C and maximum velocity of 3m/s. Resilient gate valves are suited to clean and neutral fluids, while metal seat gate valves are suited to sewage and wastewater duties. For duties beyond these constraints please contact us.

Can gate valves be used at end of line?

Gate valves are not designed for end of line isolation and a blanking flange should be used.

How are gate valves operated?

A range of gate valve operating elements are available. Ranging from a manual handwheel or stem cap that allow for remote operation via a T-key or extension spindle. For automatic operation, intelligent actuators can be fitted.

Gate Valves

Our wide range of waterworks gate valves is designed to British and European standards for potable water, wastewater, sewage and fire mains duties. Corrosion-resistant and ductile iron construction materials are used across the range to ensure our gate valves are hard-wearing and reliable.