Valve functions

The purpose of a valve is to control the flow of a liquid line medium within a pipeline system. Valves handle flow control in a number of different ways depending on the type of valve.

As each pipe system has a different function and build, epco offers a large number of different valve types, each with different variables to ensure you get the right valve to match your pipe system requirements.

What valves do epco have available?

Due to the wide number of functions that valves are required to have, we offer one of the largest valve stockholdings in the UK, all available for UK next day delivery on orders before 5pm.

Our valve range consists of a number of variations including:

• U-PVC or ABS
• Single or Double Union
• FPM or EDPM Seals
• Metric or Imperial sizes
• Standard or Industrial type
• Plain or Threaded connections
• Actuated or Manual

If you have any questions about these valve variants, our support team will be happy to assist you in ensuring you get the right valve for the job.

What does each type of valve do?

Each type of valve performs a different function, resulting in multiple types of valves often being used on a single pipe system. Below you can see what each type of valve is and its job within a pipe system.

  1. Ball Valves are used to control the flow of liquid manually. It can be turned on or off.
  2. Gate Valves are handwheel operated to allow flow capacity control and require very low maintenance.
  3. Diaphragm Valves are also handwheel operated allowing flow capacity control. Also require little maintenance.
  4. Non-Return Valves allow for a unidirectional flow and automatically prevents any back flow. They require no manual input to open or close.
  5. Air Release Valves allow the released of air from a connecting tank, limiting the build-up of pressure within a pipe.
  6. Butterfly Valves are on/ off control valves for installation between flanges, predominantly used in larger pipe diameters.

Valve variables and what they all mean

Valves consist of a wide number of variables, each with a different purpose to ensure the valves matches the pipe system requirement and performs the correct function within it.

  1. Material

    Our U-PVC Imperial valve range is made from the material unplasticised Poly-Vinyl Chloride and subject to the system pressure, has a working temperature of +5°C to +60°C.

    Our ABS Imperial manual valve range is made from the material Acrylonitrile Butadiene Styrene and subject to the system pressure, has a working temperature of -40°C to +70°C.

  2. Unions

    Our single union valves have one union on one side of the valve which allows for disconnection from a pipeline for cleaning or maintenance. The other side of the valve is fixed in place.

    Our double union valves have a union on both sides of the valve which allows for disconnection from a pipeline for cleaning and maintenance.

  3. Valve Seals

    FPM Seals, also known as Fluorocarbon rubber, has excellent heat and chemical resistance, allowing it to be used in a wide range of heavy-duty industries with aggressive line media.

    EPDM Seals (Ethylene Propylene Diene Monomer), the more commonly used rubber seal material, is widely used in water pipe systems due to its excellent low temperature range tolerance, allowing it to be used in a wide range of light to medium-duty industries, whilst still offering good chemical resistance.

Our full range of Valves

epco has one of the largest stocks of U-PVC and ABS valves in the UK. Our valves are manufactured to the highest quality and comply to BSP standards. The majority of our valves are available in sizes from 3/8” to 4” BS and 16mm to 110mm Metric sizes and are available for next day delivery up until 5pm.

We continue to expand our product range and stocks to ensure we have one of the largest offerings available in the UK. If you would like to hear about when new valves and other products are available, please click here.

You can see our full valve range on the epco website or by requesting a product catalogue.

We're here to help

If you have any questions regarding our valves or would like to see our full range of valves in our product catalogue, please don’t hesitate to contact us and we’ll be happy to help.

We have a full technical guide for valve installation. It is important to make sure you use the correct cement and cleaner to solvent weld our valves to pipes and fittings.

Contact us here.