Valve FAQs

A fusion bonded epoxy, abbreviated to FBE, is a powder based protective coating system that prevents corrosion.  It is applied by spraying the dry powder epoxy onto a pre-heated surface, causing the powder to melt and adhere on contact.

A product carrying the WRAS approved logo has undergone independent testing by the Water Regulations Advisory Scheme, ensuring functional performance and that materials do not have a detrimental impact on the media quality.

Products that features WRAS listed components have not undergone this same testing, but feature a non-metallic component that individually carries approval for potable water usage.

The following T-T Flow valves carry WRAS approval:
• Aquavault resilient gate valves
• Swing check valves
• Aquabrake air valves
• Butterfly valves
• Pressure reducing valves
• Equilibrium float valves
• Twin plate check valve
• Brass gate valve

View the range here.

When you install a valve it's best to put it at least five pipe diameters away from anything that might make the flow of fluid in the pipe turbulent, like an elbow or a pump - this supports the valve's operations and prevent damage occuring from unstable flow.

Also consider how the valve will be accessed for future maintenance and the direction of flow in the system - some valves are unidirectional (will only work in one direction).

Our valves are coated in a durable fusion bonded epoxy coating, the colour is RAL5005.

Yes, the flange drilling of the valve (the size and shape of the holes on the valve flanges) can be different from the valve's pressure rating (maximum pressure that the valve can handle, marked on the body).

This means that the valve can be connected to pipes or equipment that have flange drillings of a different size or pressure rating, as long as the pressure rating of the valve body is not exceeded.

T-T Flow's valves are designed for clean/potable water or wastewater applications, with a maximum media temperature of 70°C and a maximum velocity of 3 m/s.

For valves with specifications outside of these parameters, T-T can design and manufacture a bespoke product to perfectly match the requirements of your application. Find details about our custom valve capabilities and solutions here.

To discuss your needs with a member of the team, please call +44 (0)1630 647200, email response@ttpumps.com or complete an online enquiry form.

Safety guards can be installed on both sides of a swing check valve to provide protection from moving parts in the valve.

Basic hand tools will be required - be sure to relieve pipeline pressure and isolate the flow before starting any work to prevent accidents or injury. Safety guards can help to prevent accidents, but proper safety procedures and precautions must always be taken.

For expert technical and mechanical advice, contact T-T Flow on +44 (0)1630 647200, email response@ttpumps.com or complete our online valves enquiry form.

Each individual valve at T-T is subjected to a hydrostatic pressure test as it leaves the production line. The body is tested to 1.5 x PN and seat to 1.1 x PN to guarantee the valve will perform safely and to its expected standard.

A valve interlock is a mechanical lock that only allows access to valve controls in the order that they are designed to be operated in. This prevents incidents or damage from occuring due to incorrect operation.

To operate the valves in sequence, the operator must insert a key into the first lock, unlocking the first valve. Once the first valve is opened, a key is released and can be used to unlock the next valve. This process continues until all valves in the sequence have been opened in the correct order.

A valve operating element is a mechanism that transfers torque to the valve, this could be a handwheel, lever, extension spindle, gearbox/actuator or interlock. These options are interchangeable across the T-T Flow range but may not fit valves from other manufacturers.

Handwheels are wheels attached to the valve's stem, allowing for manual operation via wheel rotation. They are usually designed for operating and adjusting smaller valves that do not require fine control or rapid opening/closing.

Levers use manual, linear or rotational force to operate the valve, ideal for larger valves, those requiring fast opening/closing and those that require a large force than a handwheel can provide.

Extension spindles extend the length of the valve stem to allow for the operation of valves in deep, confined or otherwise difficult-to-access locations.

Gearboxes (also known as actuators) provide automated valve opening, closing and adjusting via manual or motor-driven input. Similarly to extension spindles, gearboxes can provide operators with a greater degree of safety by enabling remote operation.

T-T Flow fabricates operation equipment in a variety of materials to match site-specific requirements at our HQ in Cheshire, including remote operators that negate the need for operators to enter into hazardous areas such as confined or below ground spaces.

Extension spindles can be provided as a one-piece sectional or complete unit, extending the length of a valve stem so that it can be operated from a safe location.

Gearboxes can be operated either manually or motor driven, allowing for automatic or manual operation from a low-risk location.

Headstocks, also known as pedestals, are fabricated in complementing materials and can be thrust or non-thrust taking - providing a safe and stable foundation for operating equipment to be installed upon.

PN (Pressure Nominal) is an alphanumerical, standardised rating system for identifying the pressure ratings of various components in a pipe system, including valves. PN roughly equates to bar, meaning a PN 16 valves would be rated to 16 bar.

This helps to ensure that components are compatible with each other and that the overall system is designed to handle the expected pressure conditions.