Pressure relief Triton shower

[Matt887]

What's the usual cause of the pressure relief discharging on a Triton shower. The pressure on the system is only 3 bar. Thanks

 

[Johntheo5]

The pressure relief, PRD, operates at ~ 1.38bar and is on the outlet of the shower, all these showers are designed to give full flow at 1.0bar after the temperature control/ stabilising valve so could be caused by heating can scaling, blocked shower head or kinked shower hose, a non standard shower head atachment especilly if it has a stop/start buton will also cause it.

 

[Matt887]

Thanks is there a way of re-setting it?

 

[Johntheo5]

If its like my T80Z then two screws hold a ( now burst) diapgragm in place which you should be able to purchase from Triton or even the internet if you put in the make/ model.

 

[Matt887]

Thanks, so the pressure to the priority is 3 bar. This is then knocked down by the temperature control knob to 1bar? So only thing that can cause a surge in pressure is a kinked shower hose/head?

 

[Matt887]

The pressure relief, PRD, operates at ~ 1.38bar and is on the outlet of the shower, all these showers are designed to give full flow at 1.0bar after the temperature control/ stabilising valve so could be caused by heating can scaling, blocked shower head or kinked shower hose, a non standard shower head atachment especilly if it has a stop/start buton will also cause it.

Was this it had a start stop button

 

[Matt887]

City plumbing are selling the washer and plastic bit for £20.

 

[Harry Bloomfield]

Thanks, so the pressure to the priority is 3 bar. This is then knocked down by the temperature control knob to 1bar? So only thing that can cause a surge in pressure is a kinked shower hose/head?

The temperature control knob doesn't limit the pressure, it only restricts the flow. If the shower head, or flexible hose is restricted, then the pressure in the unit can rise to mains water pressure, at which point something has to give - which is where the PRD opens, designed to avoid more expensive damage.

 

[Matt887]

Thanks and when running pressure won't be mains pressure as the shower is flowing. Cause a restriction and it becomes full mains pressure and the diaphragm splits. Seems you can just get the diaphragm

 

[Matt887]

The customer reported the fault to the wholesalers they said they wil replace the shower if return it. But if it's just the washer...

 

[Matt887]

The temperature control knob doesn't limit the pressure, it only restricts the flow. If the shower head, or flexible hose is restricted, then the pressure in the unit can rise to mains water pressure, at which point something has to give - which is where the PRD opens, designed to avoid more expensive damage.

Thanks so there is only really main pressure in the shower up to the solenoid valve?

 

[Madrab]

This also tends to happen when the client changes the shower handset. Recent one I had was when the client's good lady changed the handset to one of those filter ones with the on and off button. it causes back pressure or is turned off, the shower keeps going, pop goes the washer.

Shouldn't cost £20, you can get them for a lot cheaper than that.

Burst washers

 

[Harry Bloomfield]

Thanks so there is only really main pressure in the shower up to the solenoid valve?

Up to the flow control/temperature setting valve. The valve restricts the flow, into the heater, so the flow and the pressure drops beyond it. As Madrab suggests, any restriction beyond that, in the flexible pipe, or shower head, can increase the pressure back to up mains pressure - and so fitting the wrong type of shower head needs to be avoided.