SEARCH

PRV misuse named as cause of avoidable boiler breakdown

Martyn Bridges, director of technical communication and product management at Worcester Bosch, believes that boiler breakdowns caused by the incorrect use of the Pressure Relief Valve (PRV) component to drain a heating system down, could be avoided indefinitely.

Mr Bridges explains: “It’s not unusual for PRVs to last the lifetime of a boiler if used correctly, as a PRV isn’t a wearable part. If a PRV is used incorrectly though, it can quickly become irreparably damaged and lead to a breakdown. 

“Unfortunately, PRVs are frequently used erroneously to drain heating systems down. This isn’t what they are designed for and can cause complications, yet due to PRVs being situated at the bottom of a boiler, in addition to being attached to a permanent pipe, it can be tempting to drain a system this way.”

When using a PRV to drain a system, any contaminants in the heating system are drained through the valve itself and end up on the seating of the valve where the valve should re-seal and shut off again. 

“The most noticeable sign of this is apparent when the heating system is put back into operation and you can see water dripping periodically from the valve outside. For the homeowner, this means they must re-pressurise the heating system from time-to-time, but ultimately, the PRV needs to be replaced.”  

Mr Bridges concludes: “The system should contain drain-off valves at all low points in the system, and all drops to radiators from above. These are the only places that a system should really be drained from.”

29 October 2018

Comments

Already Registered?
Login
Not Yet Registered?
Register

HVR Awards 2019 entries open: celebrating a decade of excellence

The HVR Awards has been carrying the torch for innovation and excellence from across the HVAC field for 10 years, and now with entries now open for the landmark edition, you have the chance to be a part of it.

  01-Apr-2019
ACR News

Groupe Atlantic UK brands raise over £38,000 for charity

Throughout 2018 and until March 2019, Groupe Atlantic’s UK brands Ideal Boilers, Ideal Commercial, Hamworthy Heating, Keston, Gledhill and Atlantic Heat have been raising funds for the group’s charity Macmillan Cancer Support. Altogether, the ...

  16-May-2019

Humidity Solutions exclusive distributors for Vapac in the UK

Humidity Solutions are now the exclusive UK distributor for the Vapac range of electrode boiler humidifiers and steam generators.
  30-Apr-2019
Heating & Ventilating Review is the number one magazine in the HVAR industry. Don’t miss out, subscribe today!
Subcribe to HVR

Diary