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Dereve Relief Valves

Product Links:

Brass Relief Valves

Stainless Steel Relief Valves

Pressure Regulators

Wind Up Door Bells

Water Savers

Fusible Plugs






The Dereve Group

Dereve's roots go a long way back into British manufacturing history. Evered Limited, was a very large manufacturing Company originally established in 1803.

Out of Evered in 1977 Dereve was established (Evered spelled backwards!), when Evered sold off its Pressure Reducer Section of its Controls Division.

Initially, Dereve's primary focus was the production of water governors and pressure reducers, but steadily we have expanded our range of products, including developing our own range of relief valves.

The Dereve group is split into four divisions:

Relief Valve & Pressure Control Division
Dereve produce a range of relief valves and pressure regulators. Our relief valves can be used with Air, Gases and Liquids, and are available brass and stainless steel with a variety of seat materials available. Pressures ranges from 0.5 bar up to 27.6 bar are available and our sizes range from 1/4" - 1" BSP.

All our Safety Valves are PED 97/23 EC approved and CE marked.

Dereve offer a large range of pressure regulators and governors and can supply regulators with either brass, chrome plated brass or plastic bodies. We also manufacture the patented “Sloflo” Water Saving Device, which offers unrivaled performance and value.

Many of our products are manufactured and designed to meet Water Regulation Advisory
Scheme approval.

Variants can be adapted to customers needs at short notice.

If you do not see the valve or regulator you are looking for on our website we will happily discuss manufacturing valves to meet your exact requirements.


Wind Up Door Bell Division
Designed and manufactured by Dereve we have produced wind up door bells since 1970, and since then we have sold in excess of 150,000 units. They are completely maintenance free and have certainly stood the test of time.
Environmentally friendly, they contains no batteries nor require any wires, and are easy to install.
Our bells are ideal for installation in areas where radio signals are disrupted/disrupting.


Plastic Moulding Division
As well as producing plastic mouldings for our own products, we undertake sub-contract moulding work which covers components for the security and communications industries.

We can produce parts from less than 2-gram to 300 grams, and we have a range of injection moulding machines from 30 to 150 Tonne clamping pressure.

For tool making we have a close working relationship with a local toolmaker giving us a very competitive mould design and tool making facility.


Machining Division
As well as producing components for our own products, we undertake sub-contract manufacturing to many companies, covering security, moulding inserts, components for high pressure equipment and components for working steam models.

Our machinery includes:
Single spindle automatic lathes up to 2" diameter
Capstan lathes for second operation
Four spindle automatic lathes
Fly presses
Semi-automaic brazing machine
Hydraulic press
Linishing Machine



iso 9001 : 2000Dereve are registered to the ISO 9001:2008 Quality standard.

All of our relief valves are manufactured under and approved to the European Pressure Directive: PED No. 97\23\EC.



Brass Relief Valves|Stainless Steel Relief Valves|Pressure Regulators|Wind Up Door Bells|Water Savers