Product category:
Drainage Services
News Release from: Hepworth Building Products | Subject: HepVO hygienic self-sealing waste valve
Edited by the Buildingtalk Editorial
Team on 03 August 2004
Solution To Unvented Domestic Hot Water
Systems
Building Research Establishment certified Hepworth Plumbing Products HepVO hygienic self-sealing waste valves for use in conjunction with discharge pipework from unvented domestic hot water systems.
Following an extensive period of testing, the Building Research Establishment has certified the Hepworth Plumbing Products HepVO hygienic self-sealing waste valve for use in conjunction with discharge pipework from unvented domestic hot water systems The availability of the product for this application tackles a common problem in multi-occupancy dwellings and has been widely welcomed by unvented cylinder manufacturers
This article was originally published on Buildingtalk on 5 Sep 2005 at 8.00am (UK)
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Where greater in capacity than 15 litres, unvented systems are required to incorporate a temperature and pressure release valve.
Hitherto, installation guidance has suggested these valves should discharge to a gully via metallic pipes - typically copper.
In some applications, however, this can be both problematic and expensive.
This is particularly the case in apartment blocks where there may be no easy access to a suitable external drain.
A more convenient, and now fully acceptable, approach is to use a HepvO valve and discharge to a soil stack - which will generally be readily accessible in all types of domestic property.
HepVO is ideally suited to such installations because it relies on a membrane seal to prevent ingress of foul air from the drainage system, rather than a water seal (as applies with a conventional water seal trap or 'U' bend).
This is because emissions from unvented systems are only periodic so a water seal trap would dry out over time, rendering it ineffective.
Says Adam Pearson of Hepworth Plumbing Products: "Granting of BRE approval allows us to meet a considerable pent up demand for a solution to the challenge of providing suitable temperature and pressure release arrangements for unvented systems in multi-occupancy dwellings.
Extensive testing has shown that discharge through a polypropylene waste pipe to the soil stack, rather than metallic pipe, has no adverse effect on performance.
The potential time and cost savings are considerable and incorporating a HepvO valve offers a very simple, reliable alternative." Further information on the use of the HepvO valve in unvented system applications can be obtained from Hepworth Plumbing Products.
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